bfgminer/main.c

/*
 * Copyright 2011 Con Kolivas
 * Copyright 2010 Jeff Garzik
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.  See COPYING for more details.
 */

#include "config.h"

#include <curses.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/time.h>
#include <time.h>
#include <math.h>
#include <stdarg.h>
#include <assert.h>
#include <signal.h>
#ifndef WIN32
#include <sys/resource.h>
#endif
#include <ccan/opt/opt.h>
#include <jansson.h>
#include <curl/curl.h>
#include "compat.h"
#include "miner.h"
#include "findnonce.h"
#include "ocl.h"

#define PROGRAM_NAME		"cgminer"
#define DEF_RPC_URL		"http://127.0.0.1:8332/"
#define DEF_RPC_USERNAME	"rpcuser"
#define DEF_RPC_PASSWORD	"rpcpass"
#define DEF_RPC_USERPASS	DEF_RPC_USERNAME ":" DEF_RPC_PASSWORD

#ifdef __linux /* Linux specific policy and affinity management */
#include <sched.h>
static inline void drop_policy(void)
{
	struct sched_param param;

#ifdef SCHED_BATCH
#ifdef SCHED_IDLE
	if (unlikely(sched_setscheduler(0, SCHED_IDLE, &param) == -1))
#endif
		sched_setscheduler(0, SCHED_BATCH, &param);
#endif
}

static inline void affine_to_cpu(int id, int cpu)
{
	cpu_set_t set;

	CPU_ZERO(&set);
	CPU_SET(cpu, &set);
	sched_setaffinity(0, sizeof(&set), &set);
	applog(LOG_INFO, "Binding cpu mining thread %d to cpu %d", id, cpu);
}
#else
static inline void drop_policy(void)
{
}

static inline void affine_to_cpu(int id, int cpu)
{
}
#endif
		
enum workio_commands {
	WC_GET_WORK,
	WC_SUBMIT_WORK,
	WC_DIE,
};

struct workio_cmd {
	enum workio_commands	cmd;
	struct thr_info		*thr;
	union {
		struct work	*work;
	} u;
};

enum sha256_algos {
	ALGO_C,			/* plain C */
	ALGO_4WAY,		/* parallel SSE2 */
	ALGO_VIA,		/* VIA padlock */
	ALGO_CRYPTOPP,		/* Crypto++ (C) */
	ALGO_CRYPTOPP_ASM32,	/* Crypto++ 32-bit assembly */
	ALGO_SSE2_64,		/* SSE2 for x86_64 */
	ALGO_SSE4_64,		/* SSE4 for x86_64 */
};

enum pool_strategy {
	POOL_FAILOVER,
	POOL_ROUNDROBIN,
	POOL_ROTATE,
	POOL_LOADBALANCE,
};

static const char *algo_names[] = {
	[ALGO_C]		= "c",
#ifdef WANT_SSE2_4WAY
	[ALGO_4WAY]		= "4way",
#endif
#ifdef WANT_VIA_PADLOCK
	[ALGO_VIA]		= "via",
#endif
	[ALGO_CRYPTOPP]		= "cryptopp",
#ifdef WANT_CRYPTOPP_ASM32
	[ALGO_CRYPTOPP_ASM32]	= "cryptopp_asm32",
#endif
#ifdef WANT_X8664_SSE2
	[ALGO_SSE2_64]		= "sse2_64",
#endif
#ifdef WANT_X8664_SSE4
	[ALGO_SSE4_64]		= "sse4_64",
#endif
};

bool opt_debug = false;
bool opt_protocol = false;
bool want_longpoll = true;
bool have_longpoll = false;
bool use_syslog = false;
static bool opt_quiet = false;
static bool opt_loginput = false;
static int opt_retries = -1;
static int opt_fail_pause = 5;
static int opt_log_interval = 5;
bool opt_log_output = false;
static bool opt_dynamic = true;
static int opt_queue;
int opt_vectors;
int opt_worksize;
int opt_scantime = 60;
static const bool opt_time = true;
#ifdef WANT_X8664_SSE4
static enum sha256_algos opt_algo = ALGO_SSE4_64;
#elif WANT_X8664_SSE2
static enum sha256_algos opt_algo = ALGO_SSE2_64;
#else
static enum sha256_algos opt_algo = ALGO_C;
#endif
static int nDevs;
static int opt_g_threads = 2;
static int opt_device;
static int total_devices;
static bool gpu_devices[16];
static int gpu_threads;
static bool forced_n_threads;
static int opt_n_threads;
static int mining_threads;
static int num_processors;
static int scan_intensity;
static bool use_curses = true;

struct thr_info *thr_info;
static int work_thr_id;
int longpoll_thr_id;
static int stage_thr_id;
static int watchdog_thr_id;
static int input_thr_id;
static int total_threads;

struct work_restart *work_restart = NULL;

static pthread_mutex_t hash_lock;
static pthread_mutex_t qd_lock;
static pthread_mutex_t stgd_lock;
static pthread_mutex_t curses_lock;
static double total_mhashes_done;
static struct timeval total_tv_start, total_tv_end;

pthread_mutex_t control_lock;

int hw_errors;
static int total_accepted, total_rejected;
static int total_getworks, total_stale, total_discarded;
static int total_queued, total_staged, lp_staged;
static unsigned int new_blocks;
static unsigned int local_work;
static unsigned int total_lo, total_ro;

static struct pool *pools = NULL;
static struct pool *currentpool;
static int pool_no;
static int total_pools;
static enum pool_strategy pool_strategy = POOL_FAILOVER;
static int opt_rotate_period;
static int total_urls, total_users, total_passes, total_userpasses;

static bool curses_active = false;

static char current_block[37];
static char longpoll_block[37];
static char blank[37];
static char datestamp[40];
static char blockdate[40];

struct sigaction termhandler, inthandler;

struct thread_q *getq;

static void applog_and_exit(const char *fmt, ...)
{
	va_list ap;
	
	va_start(ap, fmt);
	vapplog(LOG_ERR, fmt, ap);
	va_end(ap);
	exit(1);
}

static void add_pool(void)
{
	int poolno;
	struct pool *pool;

	poolno = total_pools++;
	pools = realloc(pools, sizeof(struct pool) * total_pools);
	if (!pools) {
		applog(LOG_ERR, "Failed to malloc pools in add_pool");
		exit (1);
	}
	pool = &pools[poolno];
	memset(pool, 0, sizeof(struct pool));
	pool->pool_no = poolno;
	if (unlikely(pthread_mutex_init(&pool->pool_lock, NULL))) {
		applog(LOG_ERR, "Failed to pthread_mutex_init in add_pool");
		exit (1);
	}
	/* Make sure the pool doesn't think we've been idle since time 0 */
	pool->tv_idle.tv_sec = ~0UL;
}

/* Pool variant of test and set */
static bool pool_tset(struct pool *pool, bool *var)
{
	bool ret;

	pthread_mutex_lock(&pool->pool_lock);
	ret = *var;
	*var = true;
	pthread_mutex_unlock(&pool->pool_lock);
	return ret;
}

static bool pool_tclear(struct pool *pool, bool *var)
{
	bool ret;

	pthread_mutex_lock(&pool->pool_lock);
	ret = *var;
	*var = false;
	pthread_mutex_unlock(&pool->pool_lock);
	return ret;
}

static struct pool *current_pool(void)
{
	struct pool *pool;

	pthread_mutex_lock(&control_lock);
	pool = currentpool;
	pthread_mutex_unlock(&control_lock);
	return pool;
}

/* FIXME: Use asprintf for better errors. */
static char *set_algo(const char *arg, enum sha256_algos *algo)
{
	enum sha256_algos i;

	for (i = 0; i < ARRAY_SIZE(algo_names); i++) {
		if (algo_names[i] && !strcmp(arg, algo_names[i])) {
			*algo = i;
			return NULL;
		}
	}
	return "Unknown algorithm";
}

static void show_algo(char buf[OPT_SHOW_LEN], const enum sha256_algos *algo)
{
	strncpy(buf, algo_names[*algo], OPT_SHOW_LEN);
}

static char *set_int_range(const char *arg, int *i, int min, int max)
{
	char *err = opt_set_intval(arg, i);
	if (err)
		return err;

	if (*i < min || *i > max)
		return "Value out of range";

	return NULL;
}

static char *set_int_0_to_9999(const char *arg, int *i)
{
	return set_int_range(arg, i, 0, 9999);
}

static char *forced_int_0_to_14(const char *arg, int *i)
{
	opt_dynamic = false;
	return set_int_range(arg, i, 0, 14);
}

static char *force_nthreads_int(const char *arg, int *i)
{
	forced_n_threads = true;
	return set_int_range(arg, i, 0, 9999);
}

static char *set_int_0_to_10(const char *arg, int *i)
{
	return set_int_range(arg, i, 0, 10);
}

static char *set_devices(const char *arg, int *i)
{
	char *err = opt_set_intval(arg, i);

	if (err)
		return err;

	if (*i < 0 || *i > 15)
		return "Invalid GPU device number";
	total_devices++;
	gpu_devices[*i] = true;
	return NULL;
}

static char *set_loadbalance(enum pool_strategy *strategy)
{
	*strategy = POOL_LOADBALANCE;
	return NULL;
}

static char *set_rotate(const char *arg, int *i)
{
	pool_strategy = POOL_ROTATE;
	return set_int_range(arg, i, 0, 9999);
}

static char *set_rr(enum pool_strategy *strategy)
{
	*strategy = POOL_ROUNDROBIN;
	return NULL;
}

static char *set_url(const char *arg, char **p)
{
	struct pool *pool;

	total_urls++;
	if (total_urls > total_pools)
		add_pool();
	pool = &pools[total_urls - 1];

	opt_set_charp(arg, &pool->rpc_url);
	if (strncmp(arg, "http://", 7) &&
	    strncmp(arg, "https://", 8))
		return "URL must start with http:// or https://";

	return NULL;
}

static char *set_user(const char *arg, char **p)
{
	struct pool *pool;

	if (total_userpasses)
		return "Use only user + pass or userpass, but not both";
	total_users++;
	if (total_users > total_pools)
		add_pool();

	pool = &pools[total_users - 1];
	opt_set_charp(arg, &pool->rpc_user);

	return NULL;
}

static char *set_pass(const char *arg, char **p)
{
	struct pool *pool;

	if (total_userpasses)
		return "Use only user + pass or userpass, but not both";
	total_passes++;
	if (total_passes > total_pools)
		add_pool();

	pool = &pools[total_passes - 1];
	opt_set_charp(arg, &pool->rpc_pass);

	return NULL;
}

static char *set_userpass(const char *arg, char **p)
{
	struct pool *pool;

	if (total_users || total_passes)
		return "Use only user + pass or userpass, but not both";
	total_userpasses++;
	if (total_userpasses > total_pools)
		add_pool();

	pool = &pools[total_userpasses - 1];
	opt_set_charp(arg, &pool->rpc_userpass);

	return NULL;
}

static char *set_vector(const char *arg, int *i)
{
	char *err = opt_set_intval(arg, i);
	if (err)
		return err;

	if (*i != 1 && *i != 2 && *i != 4)
		return "Valid vectors are 1, 2 or 4";
	return NULL;
}

static char *enable_debug(bool *flag)
{
	*flag = true;
	/* Turn out verbose output, too. */
	opt_log_output = true;
	return NULL;
}

static char *trpc_url;
static char *trpc_userpass;
static char *trpc_user, *trpc_pass;

/* These options are available from config file or commandline */
static struct opt_table opt_config_table[] = {
	OPT_WITH_ARG("--algo|-a",
		     set_algo, show_algo, &opt_algo,
		     "Specify sha256 implementation for CPU mining:\n"
		     "\tc\t\tLinux kernel sha256, implemented in C"
#ifdef WANT_SSE2_4WAY
		     "\n\t4way\t\ttcatm's 4-way SSE2 implementation"
#endif
#ifdef WANT_VIA_PADLOCK
		     "\n\tvia\t\tVIA padlock implementation"
#endif
		     "\n\tcryptopp\tCrypto++ C/C++ implementation"
#ifdef WANT_CRYPTOPP_ASM32
		     "\n\tcryptopp_asm32\tCrypto++ 32-bit assembler implementation"
#endif
#ifdef WANT_X8664_SSE2
		     "\n\tsse2_64\t\tSSE2 implementation for x86_64 machines"
#endif
#ifdef WANT_X8664_SSE4
		     "\n\tsse4_64\t\tSSE4 implementation for x86_64 machines"
#endif
		),
	OPT_WITH_ARG("--cpu-threads|-t",
		     force_nthreads_int, opt_show_intval, &opt_n_threads,
		     "Number of miner CPU threads"),
	OPT_WITHOUT_ARG("--debug|-D",
		     enable_debug, &opt_debug,
		     "Enable debug output"),
#ifdef HAVE_OPENCL
	OPT_WITH_ARG("--device|-d",
		     set_devices, NULL, &opt_device,
	             "Select device to use, (Use repeat -d for multiple devices, default: all)"),
	OPT_WITH_ARG("--gpu-threads|-g",
		     set_int_0_to_10, opt_show_intval, &opt_g_threads,
		     "Number of threads per GPU (0 - 10)"),
	OPT_WITH_ARG("--intensity|-I",
		     forced_int_0_to_14, opt_show_intval, &scan_intensity,
		     "Intensity of GPU scanning (0 - 14, default: dynamic to maintain desktop interactivity)"),
#endif
	OPT_WITHOUT_ARG("--load-balance",
		     set_loadbalance, &pool_strategy,
		     "Change multipool strategy from failover to even load balance"),
	OPT_WITH_ARG("--log|-l",
		     set_int_0_to_9999, opt_show_intval, &opt_log_interval,
		     "Interval in seconds between log output"),
	OPT_WITHOUT_ARG("--no-longpoll",
			opt_set_invbool, &want_longpoll,
			"Disable X-Long-Polling support"),
	OPT_WITH_ARG("--pass|-p",
		     set_pass, NULL, &trpc_pass,
		     "Password for bitcoin JSON-RPC server"),
	OPT_WITHOUT_ARG("--protocol-dump|-P",
			opt_set_bool, &opt_protocol,
			"Verbose dump of protocol-level activities"),
	OPT_WITH_ARG("--queue|-Q",
		     set_int_0_to_10, opt_show_intval, &opt_queue,
		     "Number of extra work items to queue (0 - 10)"),
	OPT_WITHOUT_ARG("--quiet|-q",
			opt_set_bool, &opt_quiet,
			"Disable per-thread hashmeter output"),
	OPT_WITH_ARG("--retries|-r",
		     opt_set_intval, opt_show_intval, &opt_retries,
		     "Number of times to retry before giving up, if JSON-RPC call fails (-1 means never)"),
	OPT_WITH_ARG("--retry-pause|-R",
		     set_int_0_to_9999, opt_show_intval, &opt_fail_pause,
		     "Number of seconds to pause, between retries"),
	OPT_WITH_ARG("--rotate",
		     set_rotate, opt_show_intval, &opt_rotate_period,
		     "Change multipool strategy from failover to regularly rotate at N minutes"),
	OPT_WITHOUT_ARG("--round-robin",
		     set_rr, &pool_strategy,
		     "Change multipool strategy from failover to round robin on failure"),
	OPT_WITH_ARG("--scan-time|-s",
		     set_int_0_to_9999, opt_show_intval, &opt_scantime,
		     "Upper bound on time spent scanning current work, in seconds"),
#ifdef HAVE_SYSLOG_H
	OPT_WITHOUT_ARG("--syslog",
			opt_set_bool, &use_syslog,
			"Use system log for output messages (default: standard error)"),
#endif
	OPT_WITHOUT_ARG("--text-only|-T",
			opt_set_invbool, &use_curses,
			"Disable ncurses formatted screen output"),
	OPT_WITH_ARG("--url|-o",
		     set_url, opt_show_charp, &trpc_url,
		     "URL for bitcoin JSON-RPC server"),
	OPT_WITH_ARG("--user|-u",
		     set_user, NULL, &trpc_user,
		     "Username for bitcoin JSON-RPC server"),
#ifdef HAVE_OPENCL
	OPT_WITH_ARG("--vectors|-v",
		     set_vector, NULL, &opt_vectors,
		     "Override detected optimal vector width (1, 2 or 4)"),
#endif
	OPT_WITHOUT_ARG("--verbose",
			opt_set_bool, &opt_log_output,
			"Log verbose output to stderr as well as status output"),
#ifdef HAVE_OPENCL
	OPT_WITH_ARG("--worksize|-w",
		     set_int_0_to_9999, opt_show_intval, &opt_worksize,
		     "Override detected optimal worksize"),
#endif
	OPT_WITH_ARG("--userpass|-O",
		     set_userpass, NULL, &trpc_userpass,
		     "Username:Password pair for bitcoin JSON-RPC server"),
	OPT_ENDTABLE
};

static char *parse_config(json_t *config)
{
	static char err_buf[200];
	json_t *val;
	struct opt_table *opt;

	for (opt = opt_config_table; opt->type != OPT_END; opt++) {
		char *p, *name;

		/* We don't handle subtables. */
		assert(!(opt->type & OPT_SUBTABLE));

		/* Pull apart the option name(s). */
		name = strdup(opt->names);
		for (p = strtok(name, "|"); p; p = strtok(NULL, "|")) {
			char *err;
			/* Ignore short options. */
			if (p[1] != '-')
				continue;

			val = json_object_get(config, p+2);
			if (!val)
				continue;

			if ((opt->type & OPT_HASARG) && json_is_string(val)) {
				err = opt->cb_arg(json_string_value(val),
						  opt->u.arg);
			} else if ((opt->type&OPT_NOARG) && json_is_true(val)) {
				err = opt->cb(opt->u.arg);
			} else {
				err = "Invalid value";
			}
			if (err) {
				sprintf(err_buf, "Parsing JSON option %s: %s",
					p, err);
				return err_buf;
			}
		}
		free(name);
	}
	return NULL;
}

static char *load_config(const char *arg, void *unused)
{
	json_error_t err;
	json_t *config;

	config = json_load_file(arg, 0, &err);
	if (!json_is_object(config))
		return "JSON decode of file failed";

	/* Parse the config now, so we can override it.  That can keep pointers
	 * so don't free config object. */
	return parse_config(config);
}

#ifdef HAVE_OPENCL
static char *print_ndevs_and_exit(int *ndevs)
{
	printf("%i GPU devices detected\n", *ndevs);
	exit(*ndevs);
}
#endif

/* These options are available from commandline only */
static struct opt_table opt_cmdline_table[] = {
	OPT_WITH_ARG("--config|-c",
		     load_config, NULL, NULL,
		     "Load a JSON-format configuration file\n"
		     "See example-cfg.json for an example configuration."),
	OPT_WITHOUT_ARG("--help|-h",
			opt_usage_and_exit,
#ifdef HAVE_OPENCL
			"\nBuilt with CPU and GPU mining support.\n",
#else
			"\nBuilt with CPU mining support only.\n",
#endif
			"Print this message"),
#ifdef HAVE_OPENCL
	OPT_WITHOUT_ARG("--ndevs|-n",
			print_ndevs_and_exit, &nDevs,
			"Enumerate number of detected GPUs and exit"),
#endif
	OPT_ENDTABLE
};

static bool jobj_binary(const json_t *obj, const char *key,
			void *buf, size_t buflen)
{
	const char *hexstr;
	json_t *tmp;

	tmp = json_object_get(obj, key);
	if (unlikely(!tmp)) {
		applog(LOG_ERR, "JSON key '%s' not found", key);
		return false;
	}
	hexstr = json_string_value(tmp);
	if (unlikely(!hexstr)) {
		applog(LOG_ERR, "JSON key '%s' is not a string", key);
		return false;
	}
	if (!hex2bin(buf, hexstr, buflen))
		return false;

	return true;
}

static bool work_decode(const json_t *val, struct work *work)
{
	if (unlikely(!jobj_binary(val, "midstate",
			 work->midstate, sizeof(work->midstate)))) {
		applog(LOG_ERR, "JSON inval midstate");
		goto err_out;
	}

	if (unlikely(!jobj_binary(val, "data", work->data, sizeof(work->data)))) {
		applog(LOG_ERR, "JSON inval data");
		goto err_out;
	}

	if (unlikely(!jobj_binary(val, "hash1", work->hash1, sizeof(work->hash1)))) {
		applog(LOG_ERR, "JSON inval hash1");
		goto err_out;
	}

	if (unlikely(!jobj_binary(val, "target", work->target, sizeof(work->target)))) {
		applog(LOG_ERR, "JSON inval target");
		goto err_out;
	}

	memset(work->hash, 0, sizeof(work->hash));

	return true;

err_out:
	return false;
}

static inline int dev_from_id(int thr_id)
{
	return thr_info[thr_id].cgpu->cpu_gpu;
}

static WINDOW *mainwin, *statuswin, *logwin;
static double total_secs = 0.1;
static char statusline[256];
static int cpucursor, gpucursor, logstart, logcursor;
static struct cgpu_info *gpus, *cpus;

static void text_print_status(int thr_id)
{
	struct cgpu_info *cgpu = thr_info[thr_id].cgpu;

	printf(" %sPU %d: [%.1f Mh/s] [Q:%d  A:%d  R:%d  HW:%d  E:%.0f%%  U:%.2f/m]\n",
	       cgpu->is_gpu ? "G" : "C", cgpu->cpu_gpu, cgpu->total_mhashes / total_secs,
			cgpu->getworks, cgpu->accepted, cgpu->rejected, cgpu->hw_errors,
			cgpu->efficiency, cgpu->utility);
}

/* Must be called with curses mutex lock held and curses_active */
static void curses_print_status(int thr_id)
{
	struct pool *pool = current_pool();

	wmove(statuswin, 0, 0);
	wattron(statuswin, A_BOLD);
	wprintw(statuswin, " " PROGRAM_NAME " version " VERSION " - Started: %s", datestamp);
	wattroff(statuswin, A_BOLD);
	wmove(statuswin, 1, 0);
	whline(statuswin, '-', 80);
	wmove(statuswin, 2,0);
	wprintw(statuswin, " %s", statusline);
	wclrtoeol(statuswin);
	wmove(statuswin, 3,0);
	wprintw(statuswin, " TQ: %d  ST: %d  LS: %d  SS: %d  DW: %d  NB: %d  LW: %d  LO: %d  RF: %d  I: %d",
		total_queued, total_staged, lp_staged, total_stale, total_discarded, new_blocks,
		local_work, total_lo, total_ro, scan_intensity);
	wclrtoeol(statuswin);
	wmove(statuswin, 4, 0);
	if (pool_strategy == POOL_LOADBALANCE && total_pools > 1)
		wprintw(statuswin, " Connected to multiple pools");
	else
		wprintw(statuswin, " Connected to %s as user %s", pool->rpc_url, pool->rpc_user);
	wclrtoeol(statuswin);
	wmove(statuswin, 5, 0);
	wprintw(statuswin, " Block %s  started: %s", current_block + 4, blockdate);
	wmove(statuswin, 6, 0);
	whline(statuswin, '-', 80);
	wmove(statuswin, logstart - 1, 0);
	whline(statuswin, '-', 80);

	if (thr_id >= 0 && thr_id < gpu_threads) {
		int gpu = dev_from_id(thr_id);
		struct cgpu_info *cgpu = &gpus[gpu];

		wmove(statuswin, gpucursor + gpu, 0);
		wprintw(statuswin, " GPU %d: [%.1f Mh/s] [Q:%d  A:%d  R:%d  HW:%d  E:%.0f%%  U:%.2f/m]",
			gpu, cgpu->total_mhashes / total_secs,
			cgpu->getworks, cgpu->accepted, cgpu->rejected, cgpu->hw_errors,
			cgpu->efficiency, cgpu->utility);
		wclrtoeol(statuswin);
	} else if (thr_id >= gpu_threads) {
		int cpu = dev_from_id(thr_id);
		struct cgpu_info *cgpu = &cpus[cpu];

		wmove(statuswin, cpucursor + cpu, 0);
		wprintw(statuswin, " CPU %d: [%.1f Mh/s] [Q:%d  A:%d  R:%d  HW:%d  E:%.0f%%  U:%.2f/m]",
			cpu, cgpu->total_mhashes / total_secs,
			cgpu->getworks, cgpu->accepted, cgpu->rejected, cgpu->hw_errors,
			cgpu->efficiency, cgpu->utility);
		wclrtoeol(statuswin);
	}
	wrefresh(statuswin);
}

static void print_status(int thr_id)
{
	if (!curses_active)
		text_print_status(thr_id);
	else {
		pthread_mutex_lock(&curses_lock);
		curses_print_status(thr_id);
		wrefresh(statuswin);
		pthread_mutex_unlock(&curses_lock);
	}
}

void log_curses(const char *f, va_list ap)
{
	if (curses_active && !opt_loginput) {
		pthread_mutex_lock(&curses_lock);
		vw_printw(logwin, f, ap);
		wrefresh(logwin);
		pthread_mutex_unlock(&curses_lock);
	} else
		vprintf(f, ap);
}

static void clear_logwin(void)
{
	pthread_mutex_lock(&curses_lock);
	wclear(logwin);
	wrefresh(logwin);
	pthread_mutex_unlock(&curses_lock);
}

static bool submit_upstream_work(const struct work *work)
{
	char *hexstr = NULL;
	json_t *val, *res;
	char s[345];
	bool rc = false;
	int thr_id = work->thr_id;
	struct cgpu_info *cgpu = thr_info[thr_id].cgpu;
	CURL *curl = curl_easy_init();
	struct pool *pool = work->pool;

	if (unlikely(!curl)) {
		applog(LOG_ERR, "CURL initialisation failed");
		return rc;
	}

	/* build hex string */
	hexstr = bin2hex(work->data, sizeof(work->data));
	if (unlikely(!hexstr)) {
		applog(LOG_ERR, "submit_upstream_work OOM");
		goto out_nofree;
	}

	/* build JSON-RPC request */
	sprintf(s,
	      "{\"method\": \"getwork\", \"params\": [ \"%s\" ], \"id\":1}\r\n",
		hexstr);

	if (opt_debug)
		applog(LOG_DEBUG, "DBG: sending RPC call: %s", s);

	/* issue JSON-RPC request */
	val = json_rpc_call(curl, pool->rpc_url, pool->rpc_userpass, s, false, false, pool);
	if (unlikely(!val)) {
		applog(LOG_INFO, "submit_upstream_work json_rpc_call failed");
		if (!pool_tset(pool, &pool->submit_fail)) {
			total_ro++;
			pool->remotefail_occasions++;
			applog(LOG_WARNING, "Pool %d communication failure, caching submissions", pool->pool_no);
		}
		goto out;
	} else if (pool_tclear(pool, &pool->submit_fail))
		applog(LOG_WARNING, "Pool %d communication resumed, submitting work", pool->pool_no);

	res = json_object_get(val, "result");

	/* Theoretically threads could race when modifying accepted and
	 * rejected values but the chance of two submits completing at the
	 * same time is zero so there is no point adding extra locking */
	if (json_is_true(res)) {
		cgpu->accepted++;
		total_accepted++;
		pool->accepted++;
		if (opt_debug)
			applog(LOG_DEBUG, "PROOF OF WORK RESULT: true (yay!!!)");
		if (!opt_quiet) {
			if (total_pools > 1)
				applog(LOG_WARNING, "Accepted %.8s %sPU %d thread %d pool %d",
				       hexstr + 152, cgpu->is_gpu? "G" : "C", cgpu->cpu_gpu, thr_id, work->pool->pool_no);
			else
				applog(LOG_WARNING, "Accepted %.8s %sPU %d thread %d",
				       hexstr + 152, cgpu->is_gpu? "G" : "C", cgpu->cpu_gpu, thr_id);
		}
	} else {
		cgpu->rejected++;
		total_rejected++;
		pool->rejected++;
		if (opt_debug)
			applog(LOG_DEBUG, "PROOF OF WORK RESULT: false (booooo)");
		if (!opt_quiet) {
			if (total_pools > 1)
				applog(LOG_WARNING, "Rejected %.8s %sPU %d thread %d pool %d",
				       hexstr + 152, cgpu->is_gpu? "G" : "C", cgpu->cpu_gpu, thr_id, work->pool->pool_no);
			else
				applog(LOG_WARNING, "Rejected %.8s %sPU %d thread %d",
				       hexstr + 152, cgpu->is_gpu? "G" : "C", cgpu->cpu_gpu, thr_id);
		}
	}

	cgpu->utility = cgpu->accepted / ( total_secs ? total_secs : 1 ) * 60;
	cgpu->efficiency = cgpu->getworks ? cgpu->accepted * 100.0 / cgpu->getworks : 0.0;

	if (!opt_quiet)
		print_status(thr_id);
	applog(LOG_INFO, "%sPU %d  Q:%d  A:%d  R:%d  HW:%d  E:%.0f%%  U:%.2f/m",
		cgpu->is_gpu? "G" : "C", cgpu->cpu_gpu, cgpu->getworks, cgpu->accepted,
		cgpu->rejected, cgpu->hw_errors, cgpu->efficiency, cgpu->utility);

	json_decref(val);

	rc = true;
out:
	free(hexstr);
out_nofree:
	curl_easy_cleanup(curl);
	return rc;
}

static const char *rpc_req =
	"{\"method\": \"getwork\", \"params\": [], \"id\":0}\r\n";

static int rotating_pool;

/* Select any active pool in a rotating fashion when loadbalance is chosen */
static inline struct pool *select_pool(void)
{
	if (pool_strategy == POOL_LOADBALANCE) {
		struct pool *pool;

		rotating_pool++;
		if (rotating_pool >= total_pools)
			rotating_pool = 0;
		pool = &pools[rotating_pool];
		if (!pool->idle && pool->enabled)
			return &pools[rotating_pool];
	}
	return current_pool();
}

static bool get_upstream_work(struct work *work)
{
	struct pool *pool = select_pool();
	json_t *val;
	bool rc = false;
	CURL *curl = curl_easy_init();

	if (unlikely(!curl)) {
		applog(LOG_ERR, "CURL initialisation failed");
		return rc;
	}

	val = json_rpc_call(curl, pool->rpc_url, pool->rpc_userpass, rpc_req,
			    want_longpoll, false, pool);
	if (unlikely(!val)) {
		applog(LOG_DEBUG, "Failed json_rpc_call in get_upstream_work");
		goto out;
	}

	rc = work_decode(json_object_get(val, "result"), work);
	work->pool = pool;
	total_getworks++;
	pool->getwork_requested++;

	json_decref(val);
out:
	curl_easy_cleanup(curl);

	return rc;
}

static void workio_cmd_free(struct workio_cmd *wc)
{
	if (!wc)
		return;

	switch (wc->cmd) {
	case WC_SUBMIT_WORK:
		free(wc->u.work);
		break;
	default: /* do nothing */
		break;
	}

	memset(wc, 0, sizeof(*wc));	/* poison */
	free(wc);
}

static void disable_curses(void)
{
	if (test_and_clear(&curses_active)) {
		nocbreak();
		echo();
		delwin(logwin);
		delwin(statuswin);
		delwin(mainwin);
		endwin();
		refresh();
	}
}

void kill_work(void)
{
	struct workio_cmd *wc;
	struct thr_info *thr;
	unsigned int i;

	disable_curses();
	applog(LOG_INFO, "Received kill message");

	/* Kill the watchdog thread */
	thr = &thr_info[watchdog_thr_id];
	pthread_cancel(thr->pth);

	/* Stop the mining threads*/
	for (i = 0; i < mining_threads; i++) {
		thr = &thr_info[i];
		if (!thr->pth)
			continue;
		tq_freeze(thr->q);
		/* No need to check if this succeeds or not */
		pthread_cancel(thr->pth);
	}

	/* Stop the others */
	thr = &thr_info[stage_thr_id];
	pthread_cancel(thr->pth);
	thr = &thr_info[longpoll_thr_id];
	pthread_cancel(thr->pth);

	wc = calloc(1, sizeof(*wc));
	if (unlikely(!wc)) {
		applog(LOG_ERR, "Failed to calloc wc in kill_work");
		/* We're just trying to die anyway, so forget graceful */
		exit (1);
	}

	wc->cmd = WC_DIE;
	wc->thr = 0;

	if (unlikely(!tq_push(thr_info[work_thr_id].q, wc))) {
		applog(LOG_ERR, "Failed to tq_push work in kill_work");
		exit (1);
	}
}

static void sighandler(int sig)
{
	/* Restore signal handlers so we can still quit if kill_work fails */
	sigaction(SIGTERM, &termhandler, NULL);
	sigaction(SIGINT, &inthandler, NULL);
	kill_work();
}

static void *get_work_thread(void *userdata)
{
	struct workio_cmd *wc = (struct workio_cmd *)userdata;
	struct work *ret_work;
	int failures = 0;

	pthread_detach(pthread_self());
	ret_work = calloc(1, sizeof(*ret_work));
	if (unlikely(!ret_work)) {
		applog(LOG_ERR, "Failed to calloc ret_work in workio_get_work");
		kill_work();
		goto out;
	}

	/* obtain new work from bitcoin via JSON-RPC */
	while (!get_upstream_work(ret_work)) {
		if (unlikely((opt_retries >= 0) && (++failures > opt_retries))) {
			applog(LOG_ERR, "json_rpc_call failed, terminating workio thread");
			free(ret_work);
			kill_work();
			goto out;
		}

		/* pause, then restart work-request loop */
		applog(LOG_DEBUG, "json_rpc_call failed on get work, retry after %d seconds",
			opt_fail_pause);
		sleep(opt_fail_pause);
	}

	/* send work to requesting thread */
	if (unlikely(!tq_push(thr_info[stage_thr_id].q, ret_work))) {
		applog(LOG_ERR, "Failed to tq_push work in workio_get_work");
		kill_work();
		free(ret_work);
	}

out:
	workio_cmd_free(wc);
	return NULL;
}

static bool workio_get_work(struct workio_cmd *wc)
{
	pthread_t get_thread;

	if (unlikely(pthread_create(&get_thread, NULL, get_work_thread, (void *)wc))) {
		applog(LOG_ERR, "Failed to create get_work_thread");
		return false;
	}
	return true;
}

static bool stale_work(struct work *work)
{
	bool ret = false;
	char *hexstr;

	if (!strncmp(blank, current_block, 36))
		return ret;

	hexstr = bin2hex(work->data, 36);
	if (unlikely(!hexstr)) {
		applog(LOG_ERR, "submit_work_thread OOM");
		return ret;
	}

	if (strncmp(hexstr, current_block, 36))
		ret = true;

	free(hexstr);
	return ret;
}

static void *submit_work_thread(void *userdata)
{
	struct workio_cmd *wc = (struct workio_cmd *)userdata;
	struct work *work = wc->u.work;
	struct pool *pool = work->pool;
	int failures = 0;

	pthread_detach(pthread_self());

	if (stale_work(work)) {
		applog(LOG_WARNING, "Stale share detected, discarding");
		total_stale++;
		pool->stale_shares++;
		goto out;
	}

	/* submit solution to bitcoin via JSON-RPC */
	while (!submit_upstream_work(work)) {
		if (stale_work(work)) {
			applog(LOG_WARNING, "Stale share detected, discarding");
			total_stale++;
			pool->stale_shares++;
			break;
		}
		if (unlikely((opt_retries >= 0) && (++failures > opt_retries))) {
			applog(LOG_ERR, "Failed %d retries ...terminating workio thread", opt_retries);
			kill_work();
			break;
		}

		/* pause, then restart work-request loop */
		applog(LOG_INFO, "json_rpc_call failed on submit_work, retry after %d seconds",
			opt_fail_pause);
		sleep(opt_fail_pause);
	}
out:
	workio_cmd_free(wc);
	return NULL;
}

static bool workio_submit_work(struct workio_cmd *wc)
{
	pthread_t submit_thread;

	if (unlikely(pthread_create(&submit_thread, NULL, submit_work_thread, (void *)wc))) {
		applog(LOG_ERR, "Failed to create submit_work_thread");
		return false;
	}
	return true;
}

static void inc_staged(struct pool *pool, int inc, bool lp)
{
	pthread_mutex_lock(&stgd_lock);
	if (lp) {
		lp_staged += inc;
		total_staged += inc;
	} else if (lp_staged)
		--lp_staged;
	else
		total_staged += inc;
	pthread_mutex_unlock(&stgd_lock);
}

static void dec_staged(int inc)
{
	pthread_mutex_lock(&stgd_lock);
	total_staged -= inc;
	pthread_mutex_unlock(&stgd_lock);
}

static int requests_staged(void)
{
	int ret;

	pthread_mutex_lock(&stgd_lock);
	ret = total_staged;
	pthread_mutex_unlock(&stgd_lock);
	return ret;
}

static int real_staged(void)
{
	int ret;

	pthread_mutex_lock(&stgd_lock);
	ret = total_staged - lp_staged;
	pthread_mutex_unlock(&stgd_lock);
	return ret;
}

static void switch_pools(void)
{
	struct pool *pool, *last_pool;
	int i, pools_active = 0;

	for (i = 0; i < total_pools; i++) {
		pool = &pools[i];

		if (!pool->idle && pool->enabled)
			pools_active++;
	}
	
	if (!pools_active) {
		applog(LOG_ERR, "No pools active, waiting...");
		goto out;
	}

	pthread_mutex_lock(&control_lock);
	last_pool = currentpool;
	switch (pool_strategy) {
		/* Both of these set to the master pool */
		case POOL_FAILOVER:
		case POOL_LOADBALANCE:
			for (i = 0; i < total_pools; i++) {
				if (!pools[i].idle && pools[i].enabled) {
					pool_no = i;
					break;
				}
			}
			break;
		/* Both of these simply increment and cycle */
		case POOL_ROUNDROBIN:
		case POOL_ROTATE:
			pool_no++;
			if (pool_no >= total_pools)
				pool_no = 0;
			break;
		default:
			break;
	}
	currentpool = &pools[pool_no];
	pool = currentpool;
	pthread_mutex_unlock(&control_lock);

	if (pool != last_pool)
		applog(LOG_WARNING, "Switching to %s", pool->rpc_url);

	/* Reset the queued amount to allow more to be queued for the new pool */
	pthread_mutex_lock(&qd_lock);
	total_queued = 0;
	pthread_mutex_unlock(&qd_lock);
out:
	inc_staged(pool, 1, true);
}

static void set_curblock(char *hexstr)
{
	struct timeval tv_now;
	struct tm tm;

	memcpy(current_block, hexstr, 36);
	gettimeofday(&tv_now, NULL);
	localtime_r(&tv_now.tv_sec, &tm);
	sprintf(blockdate, "[%d-%02d-%02d %02d:%02d:%02d]",
		tm.tm_year + 1900,
		tm.tm_mon + 1,
		tm.tm_mday,
		tm.tm_hour,
		tm.tm_min,
		tm.tm_sec);
}

static void *stage_thread(void *userdata)
{
	struct thr_info *mythr = userdata;
	bool ok = true;

	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);

	while (ok) {
		struct work *work = NULL;
		char *hexstr;

		work = tq_pop(mythr->q, NULL);
		if (unlikely(!work)) {
			applog(LOG_ERR, "Failed to tq_pop in stage_thread");
			ok = false;
			break;
		}

		hexstr = bin2hex(work->data, 36);
		if (unlikely(!hexstr)) {
			applog(LOG_ERR, "stage_thread OOM");
			break;
		}

		/* current_block is blanked out on successful longpoll */
		if (likely(strncmp(current_block, blank, 36))) {
			if (unlikely(strncmp(hexstr, current_block, 36))) {
				new_blocks++;
				if (have_longpoll)
					applog(LOG_WARNING, "New block detected on network before longpoll, waiting on fresh work");
				else
					applog(LOG_WARNING, "New block detected on network, waiting on fresh work");
				/* As we can't flush the work from here, signal
				 * the wakeup thread to restart all the
				 * threads */
				work_restart[watchdog_thr_id].restart = 1;
				set_curblock(hexstr);
			}
		} else {
			set_curblock(hexstr);
			memcpy(longpoll_block, hexstr, 36);
		}
		free(hexstr);

		if (unlikely(!tq_push(getq, work))) {
			applog(LOG_ERR, "Failed to tq_push work in stage_thread");
			ok = false;
			break;
		}
		inc_staged(work->pool, 1, false);
	}

	tq_freeze(mythr->q);
	return NULL;
}

static void display_pools(void)
{
	int i, cp = current_pool()->pool_no;

	opt_loginput = true;
	clear_logwin();
	pthread_mutex_lock(&curses_lock);
	for (i = 0; i < total_pools; i++) {
		struct pool *pool = &pools[i];

		if (i == cp)
			wattron(logwin, A_BOLD);
		wprintw(logwin, "%s Pool %d: %s  User:%s\n", pool->enabled? "Enabled" : "Disabled",
			pool->pool_no, pool->rpc_url, pool->rpc_user);
		wattroff(logwin, A_BOLD);
	}
	//wprintw(logwin, "[A]dd pool [S]witch pool [D]isable pool [E]nable pool");
	wprintw(logwin, "Press any key to continue\n");
	wrefresh(logwin);
	pthread_mutex_unlock(&curses_lock);
	i = getch();
	opt_loginput = false;
}

static void *input_thread(void *userdata)
{
	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);

	if (!curses_active)
		return NULL;

	while (1) {
		char input;

		input = getch();
		if (!strncasecmp(&input, "q", 1)) {
			kill_work();
			return NULL;
		} else if (!strncasecmp(&input, "s", 1)) {
			opt_quiet ^= true;
			applog(LOG_WARNING, "Silent mode %s", opt_quiet ? "enabled" : "disabled");
		} else if (!strncasecmp(&input, "v", 1)) {
			opt_log_output ^= true;
			applog(LOG_WARNING, "Verbose mode %s", opt_log_output ? "enabled" : "disabled");
		} else if (!strncasecmp(&input, "n", 1)) {
			opt_log_output = true;
			opt_debug = false;
			opt_quiet = false;
			opt_protocol = false;
			applog(LOG_WARNING, "Output mode reset to normal");
		} else if (!strncasecmp(&input, "d", 1)) {
			opt_debug ^= true;
			applog(LOG_WARNING, "Debug mode %s", opt_debug ? "enabled" : "disabled");
		} else if (!strncasecmp(&input, "r", 1)) {
			opt_protocol ^= true;
			applog(LOG_WARNING, "RPC protocl debugging %s", opt_protocol ? "enabled" : "disabled");
		} else if (!strncasecmp(&input, "c", 1))
			clear_logwin();
		else if (!strncasecmp(&input, "p", 1))
			display_pools();
	}

	return NULL;
}

static void *workio_thread(void *userdata)
{
	struct thr_info *mythr = userdata;
	bool ok = true;

	while (ok) {
		struct workio_cmd *wc;

		/* wait for workio_cmd sent to us, on our queue */
		wc = tq_pop(mythr->q, NULL);
		if (unlikely(!wc)) {
			applog(LOG_ERR, "Failed to tq_pop in workio_thread");
			ok = false;
			break;
		}

		/* process workio_cmd */
		switch (wc->cmd) {
		case WC_GET_WORK:
			ok = workio_get_work(wc);
			break;
		case WC_SUBMIT_WORK:
			ok = workio_submit_work(wc);
			break;
		case WC_DIE:
		default:
			ok = false;
			break;
		}
	}

	tq_freeze(mythr->q);

	return NULL;
}

static void thread_reportin(struct thr_info *thr)
{
	gettimeofday(&thr->last, NULL);
	thr->getwork = false;
}

static inline void thread_reportout(struct thr_info *thr)
{
	thr->getwork = true;
}

static void hashmeter(int thr_id, struct timeval *diff,
		      unsigned long hashes_done)
{
	struct timeval temp_tv_end, total_diff;
	double khashes, secs;
	double local_secs;
	double utility, efficiency = 0.0;
	static double local_mhashes_done = 0;
	static double rolling_local = 0;
	double local_mhashes = (double)hashes_done / 1000000.0;
	struct cgpu_info *cgpu = thr_info[thr_id].cgpu;

	/* Update the last time this thread reported in */
	if (thr_id >= 0)
		gettimeofday(&thr_info[thr_id].last, NULL);

	/* Don't bother calculating anything if we're not displaying it */
	if (opt_quiet || !opt_log_interval)
		return;
	
	khashes = hashes_done / 1000.0;
	secs = (double)diff->tv_sec + ((double)diff->tv_usec / 1000000.0);

	if (thr_id >= 0 && secs) {
		/* So we can call hashmeter from a non worker thread */
		if (opt_debug)
			applog(LOG_DEBUG, "[thread %d: %lu hashes, %.0f khash/sec]",
				thr_id, hashes_done, hashes_done / secs);
		cgpu->local_mhashes += local_mhashes;
		cgpu->total_mhashes += local_mhashes;
	}

	/* Totals are updated by all threads so can race without locking */
	pthread_mutex_lock(&hash_lock);
	gettimeofday(&temp_tv_end, NULL);
	timeval_subtract(&total_diff, &temp_tv_end, &total_tv_end);
	local_secs = (double)total_diff.tv_sec + ((double)total_diff.tv_usec / 1000000.0);

	total_mhashes_done += local_mhashes;
	local_mhashes_done += local_mhashes;
	if (total_diff.tv_sec < opt_log_interval)
		/* Only update the total every opt_log_interval seconds */
		goto out_unlock;
	gettimeofday(&total_tv_end, NULL);

	/* Use a rolling average by faking an exponential decay over 5 * log */
	rolling_local = ((rolling_local * 0.9) + local_mhashes_done) / 1.9;

	timeval_subtract(&total_diff, &total_tv_end, &total_tv_start);
	total_secs = (double)total_diff.tv_sec +
		((double)total_diff.tv_usec / 1000000.0);

	utility = total_accepted / ( total_secs ? total_secs : 1 ) * 60;
	efficiency = total_getworks ? total_accepted * 100.0 / total_getworks : 0.0;

	sprintf(statusline, "[(%ds):%.1f  (avg):%.1f Mh/s] [Q:%d  A:%d  R:%d  HW:%d  E:%.0f%%  U:%.2f/m]",
		opt_log_interval, rolling_local / local_secs, total_mhashes_done / total_secs,
		total_getworks, total_accepted, total_rejected, hw_errors, efficiency, utility);
	if (!curses_active) {
		printf("%s          \r", statusline);
		fflush(stdout);
	} else
		applog(LOG_INFO, "%s", statusline);

	local_mhashes_done = 0;
out_unlock:
	pthread_mutex_unlock(&hash_lock);
}

/* This is overkill, but at least we'll know accurately how much work is
 * queued to prevent ever being left without work */
static void inc_queued(void)
{
	pthread_mutex_lock(&qd_lock);
	total_queued++;
	pthread_mutex_unlock(&qd_lock);
}

static void dec_queued(void)
{
	pthread_mutex_lock(&qd_lock);
	if (total_queued > 0)
		total_queued--;
	pthread_mutex_unlock(&qd_lock);
	dec_staged(1);
}

static int requests_queued(void)
{
	int ret;

	pthread_mutex_lock(&qd_lock);
	ret = total_queued;
	pthread_mutex_unlock(&qd_lock);
	return ret;
}

static bool pool_active(struct pool *pool)
{
	bool ret = false;
	json_t *val;
	CURL *curl;

	curl = curl_easy_init();
	if (unlikely(!curl)) {
		applog(LOG_ERR, "CURL initialisation failed");
		return false;
	}

	val = json_rpc_call(curl, pool->rpc_url, pool->rpc_userpass, rpc_req,
			true, false, pool);

	if (val) {
		struct work *work = malloc(sizeof(struct work));
		bool rc;

		if (!work) {
			applog(LOG_ERR, "Unable to malloc work in pool_active");
			goto out;
		}
		rc = work_decode(json_object_get(val, "result"), work);
		if (rc) {
			applog(LOG_DEBUG, "Successfully retreived and deciphered work from pool %u %s",
			       pool->pool_no, pool->rpc_url);
			work->pool = pool;
			tq_push(thr_info[stage_thr_id].q, work);
			total_getworks++;
			pool->getwork_requested++;
			inc_queued();
			ret = true;
			gettimeofday(&pool->tv_idle, NULL);
		} else {
			applog(LOG_DEBUG, "Successfully retreived but FAILED to decipher work from pool %u %s",
			       pool->pool_no, pool->rpc_url);
			free(work);
		}
		json_decref(val);
	} else
		applog(LOG_DEBUG, "FAILED to retrieve work from pool %u %s",
		       pool->pool_no, pool->rpc_url);
out:
	curl_easy_cleanup(curl);
	return ret;
}

static void pool_died(struct pool *pool)
{
	applog(LOG_WARNING, "Pool %d %s not responding!", pool->pool_no, pool->rpc_url);
	gettimeofday(&pool->tv_idle, NULL);
	switch_pools();
}

static void pool_resus(struct pool *pool)
{
	applog(LOG_WARNING, "Pool %d %s recovered", pool->pool_no, pool->rpc_url);
	if (pool->pool_no < pool_no && pool_strategy == POOL_FAILOVER)
		switch_pools();
}

static bool queue_request(void)
{
	int maxq = opt_queue + mining_threads;
	struct workio_cmd *wc;

	/* If we've been generating lots of local work we may already have
	 * enough in the queue */
	if (requests_queued() >= maxq || real_staged() >= maxq)
		return true;

	/* fill out work request message */
	wc = calloc(1, sizeof(*wc));
	if (unlikely(!wc)) {
		applog(LOG_ERR, "Failed to tq_pop in queue_request");
		return false;
	}

	wc->cmd = WC_GET_WORK;
	/* The get work does not belong to any thread */
	wc->thr = NULL;

	/* send work request to workio thread */
	if (unlikely(!tq_push(thr_info[work_thr_id].q, wc))) {
		applog(LOG_ERR, "Failed to tq_push in queue_request");
		workio_cmd_free(wc);
		return false;
	}
	inc_queued();
	return true;
}

static void discard_staged(void)
{
	struct timespec abstime = {};
	struct timeval now;
	struct work *work_heap;
	struct pool *pool;

	/* Just in case we fell in a hole and missed a queue filling */
	if (unlikely(!requests_staged()))
		return;

	gettimeofday(&now, NULL);
	abstime.tv_sec = now.tv_sec + 60;

	work_heap = tq_pop(getq, &abstime);
	if (unlikely(!work_heap))
		return;

	pool = work_heap->pool;
	free(work_heap);
	dec_queued();
	pool->discarded_work++;
	total_discarded++;
}

static void flush_requests(bool longpoll)
{
	struct pool *pool = current_pool();
	int i, stale;

	/* We should have one fresh work item staged from the block change. */
	stale = requests_staged() - 1;
	if (longpoll)
		memcpy(current_block, blank, 36);

	/* Temporarily increase the staged count so that get_work thinks there
	 * is work available instead of making threads reuse existing work */
	inc_staged(pool, mining_threads, true);

	for (i = 0; i < stale; i++) {
		/* Queue a whole batch of new requests */
		if (unlikely(!queue_request())) {
			applog(LOG_ERR, "Failed to queue requests in flush_requests");
			kill_work();
			break;
		}
		/* Pop off the old requests. Cancelling the requests would be better
		* but is tricky */
		discard_staged();
	}
}

static bool get_work(struct work *work, bool queued, struct thr_info *thr,
		     const int thr_id)
{
	struct timespec abstime = {};
	struct timeval now;
	struct work *work_heap;
	struct pool *pool;
	bool ret = false;
	int failures = 0;

	/* Tell the watchdog thread this thread is waiting on getwork and
	 * should not be restarted */
	thread_reportout(thr);
retry:
	pool = current_pool();
	if (unlikely(!queued && !queue_request())) {
		applog(LOG_WARNING, "Failed to queue_request in get_work");
		goto out;
	}

	if (!requests_staged() && !stale_work(work) && work->pool->has_rolltime) {
		uint32_t *work_ntime;
		uint32_t ntime;

		/* Only print this message once each time we shift to localgen */
		if (!pool_tset(pool, &pool->idle)) {
			applog(LOG_WARNING, "Pool %d not providing work fast enough, generating work locally",
				pool->pool_no);
			pool->localgen_occasions++;
			total_lo++;
			gettimeofday(&pool->tv_idle, NULL);
		} else {
			struct timeval tv_now, diff;

			gettimeofday(&tv_now, NULL);
			timeval_subtract(&diff, &tv_now, &pool->tv_idle);
			/* Attempt to switch pools if this one has been unresponsive for >half
				* a block's duration */
			if (diff.tv_sec > 300) {
				pool_died(pool);
				goto retry;
			}
		}

		work_ntime = (uint32_t *)(work->data + 68);
		ntime = be32toh(*work_ntime);
		ntime++;
		*work_ntime = htobe32(ntime);
		ret = true;
		local_work++;
		goto out;
	}

	gettimeofday(&now, NULL);
	abstime.tv_sec = now.tv_sec + 60;

	/* wait for 1st response, or get cached response */
	work_heap = tq_pop(getq, &abstime);
	if (unlikely(!work_heap)) {
		/* Attempt to switch pools if this one has mandatory work that
		 * has timed out or does not support rolltime */
		pool->localgen_occasions++;
		total_lo++;
		pool_died(pool);
		goto retry;
	}

	pool = work_heap->pool;
	/* If we make it here we have succeeded in getting fresh work */
	if (pool_tclear(pool, &pool->idle))
		pool_resus(pool);
	dec_queued();

	memcpy(work, work_heap, sizeof(*work));
	
	ret = true;
	free(work_heap);
out:
	if (unlikely(ret == false)) {
		if ((opt_retries >= 0) && (++failures > opt_retries)) {
			applog(LOG_ERR, "Failed %d times to get_work");
			return ret;
		}
		applog(LOG_DEBUG, "Retrying after %d seconds", opt_fail_pause);
		sleep(opt_fail_pause);
		goto retry;
	}

	work->thr_id = thr_id;
	thread_reportin(thr);
	return ret;
}

static bool submit_work_sync(struct thr_info *thr, const struct work *work_in)
{
	struct workio_cmd *wc;

	/* fill out work request message */
	wc = calloc(1, sizeof(*wc));
	if (unlikely(!wc)) {
		applog(LOG_ERR, "Failed to calloc wc in submit_work_sync");
		return false;
	}

	wc->u.work = malloc(sizeof(*work_in));
	if (unlikely(!wc->u.work)) {
		applog(LOG_ERR, "Failed to calloc work in submit_work_sync");
		goto err_out;
	}

	wc->cmd = WC_SUBMIT_WORK;
	wc->thr = thr;
	memcpy(wc->u.work, work_in, sizeof(*work_in));

	/* send solution to workio thread */
	if (unlikely(!tq_push(thr_info[work_thr_id].q, wc))) {
		applog(LOG_ERR, "Failed to tq_push work in submit_work_sync");
		goto err_out;
	}

	return true;
err_out:
	workio_cmd_free(wc);
	return false;
}

bool submit_nonce(struct thr_info *thr, struct work *work, uint32_t nonce)
{
	work->data[64+12+0] = (nonce>>0) & 0xff;
	work->data[64+12+1] = (nonce>>8) & 0xff;
	work->data[64+12+2] = (nonce>>16) & 0xff;
	work->data[64+12+3] = (nonce>>24) & 0xff;
	return submit_work_sync(thr, work);
}

static void *miner_thread(void *userdata)
{
	struct thr_info *mythr = userdata;
	const int thr_id = mythr->id;
	uint32_t max_nonce = 0xffffff;
	unsigned long hashes_done = max_nonce;
	bool needs_work = true;
	/* Try to cycle approximately 5 times before each log update */
	const unsigned long cycle = opt_log_interval / 5 ? : 1;
	/* Request the next work item at 2/3 of the scantime */
	unsigned const int request_interval = opt_scantime * 2 / 3 ? : 1;
	unsigned const long request_nonce = MAXTHREADS / 3 * 2;
	bool requested = true;

	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);

	/* Set worker threads to nice 19 and then preferentially to SCHED_IDLE
	 * and if that fails, then SCHED_BATCH. No need for this to be an
	 * error if it fails */
	setpriority(PRIO_PROCESS, 0, 19);
	drop_policy();

	/* Cpu affinity only makes sense if the number of threads is a multiple
	 * of the number of CPUs */
	if (!(opt_n_threads % num_processors))
		affine_to_cpu(thr_id - gpu_threads, dev_from_id(thr_id));

	while (1) {
		struct work work __attribute__((aligned(128)));
		struct timeval tv_workstart, tv_start, tv_end, diff;
		uint64_t max64;
		bool rc;

		if (needs_work) {
			gettimeofday(&tv_workstart, NULL);
			/* obtain new work from internal workio thread */
			if (unlikely(!get_work(&work, requested, mythr, thr_id))) {
				applog(LOG_ERR, "work retrieval failed, exiting "
					"mining thread %d", thr_id);
				goto out;
			}
			mythr->cgpu->getworks++;
			needs_work = requested = false;
			work.blk.nonce = 0;
			max_nonce = hashes_done;
		}
		hashes_done = 0;
		gettimeofday(&tv_start, NULL);

		/* scan nonces for a proof-of-work hash */
		switch (opt_algo) {
		case ALGO_C:
			rc = scanhash_c(thr_id, work.midstate, work.data + 64,
				        work.hash1, work.hash, work.target,
					max_nonce, &hashes_done,
					work.blk.nonce);
			break;

#ifdef WANT_X8664_SSE2
		case ALGO_SSE2_64: {
			unsigned int rc5 =
			        scanhash_sse2_64(thr_id, work.midstate, work.data + 64,
						 work.hash1, work.hash,
						 work.target,
					         max_nonce, &hashes_done,
						 work.blk.nonce);
			rc = (rc5 == -1) ? false : true;
			}
			break;
#endif

#ifdef WANT_X8664_SSE4
		case ALGO_SSE4_64: {
			unsigned int rc5 =
			        scanhash_sse4_64(thr_id, work.midstate, work.data + 64,
						 work.hash1, work.hash,
						 work.target,
					         max_nonce, &hashes_done,
						 work.blk.nonce);
			rc = (rc5 == -1) ? false : true;
			}
			break;
#endif

#ifdef WANT_SSE2_4WAY
		case ALGO_4WAY: {
			unsigned int rc4 =
				ScanHash_4WaySSE2(thr_id, work.midstate, work.data + 64,
						  work.hash1, work.hash,
						  work.target,
						  max_nonce, &hashes_done,
						  work.blk.nonce);
			rc = (rc4 == -1) ? false : true;
			}
			break;
#endif

#ifdef WANT_VIA_PADLOCK
		case ALGO_VIA:
			rc = scanhash_via(thr_id, work.data, work.target,
					  max_nonce, &hashes_done,
					  work.blk.nonce);
			break;
#endif
		case ALGO_CRYPTOPP:
			rc = scanhash_cryptopp(thr_id, work.midstate, work.data + 64,
				        work.hash1, work.hash, work.target,
					max_nonce, &hashes_done,
					work.blk.nonce);
			break;

#ifdef WANT_CRYPTOPP_ASM32
		case ALGO_CRYPTOPP_ASM32:
			rc = scanhash_asm32(thr_id, work.midstate, work.data + 64,
				        work.hash1, work.hash, work.target,
					max_nonce, &hashes_done,
					work.blk.nonce);
			break;
#endif

		default:
			/* should never happen */
			goto out;
		}

		/* record scanhash elapsed time */
		gettimeofday(&tv_end, NULL);
		timeval_subtract(&diff, &tv_end, &tv_start);

		hashes_done -= work.blk.nonce;
		hashmeter(thr_id, &diff, hashes_done);
		work.blk.nonce += hashes_done;

		/* adjust max_nonce to meet target cycle time */
		if (diff.tv_usec > 500000)
			diff.tv_sec++;
		if (diff.tv_sec && diff.tv_sec != cycle) {
			max64 = work.blk.nonce +
				((uint64_t)hashes_done * cycle) / diff.tv_sec;
		} else
			max64 = work.blk.nonce + hashes_done;
		if (max64 > 0xfffffffaULL)
			max64 = 0xfffffffaULL;
		max_nonce = max64;

		/* if nonce found, submit work */
		if (unlikely(rc)) {
			if (opt_debug)
				applog(LOG_DEBUG, "CPU %d found something?", dev_from_id(thr_id));
			if (unlikely(!submit_work_sync(mythr, &work))) {
				applog(LOG_ERR, "Failed to submit_work_sync in miner_thread %d", thr_id);
				break;
			}
			work.blk.nonce += 4;
		}

		timeval_subtract(&diff, &tv_end, &tv_workstart);
		if (!requested && (diff.tv_sec > request_interval || work.blk.nonce > request_nonce)) {
			if (unlikely(!queue_request())) {
				applog(LOG_ERR, "Failed to queue_request in miner_thread %d", thr_id);
				goto out;
			}
			requested = true;
		}

		if (diff.tv_sec > opt_scantime || work_restart[thr_id].restart ||
			work.blk.nonce >= MAXTHREADS - hashes_done ||
			stale_work(&work))
				needs_work = true;
	}

out:
	tq_freeze(mythr->q);

	return NULL;
}

enum {
	STAT_SLEEP_INTERVAL		= 1,
	STAT_CTR_INTERVAL		= 10000000,
	FAILURE_INTERVAL		= 30,
};

#ifdef HAVE_OPENCL
static _clState *clStates[16];

static inline cl_int queue_kernel_parameters(_clState *clState, dev_blk_ctx *blk)
{
	cl_kernel *kernel = &clState->kernel;
	cl_int status = 0;
	int num = 0;

	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_a);
	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_b);
	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_c);
	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_d);
	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_e);
	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_f);
	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_g);
	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_h);
	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->cty_b);
	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->cty_c);
	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->cty_d);
	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->cty_f);
	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->cty_g);
	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->cty_h);
	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->nonce);

	if (clState->hasBitAlign == true) {
		/* Parameters for phatk kernel */
		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->W2);
		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->W16);
		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->W17);
		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->PreVal4);
		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->T1);
	} else {
		/* Parameters for poclbm kernel */
		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fW0);
		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fW1);
		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fW2);
		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fW3);
		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fW15);
		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fW01r);
		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fcty_e);
		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fcty_e2);
	}
	status |= clSetKernelArg(*kernel, num++, sizeof(clState->outputBuffer),
				 (void *)&clState->outputBuffer);

	return status;
}

static void set_threads_hashes(unsigned int vectors, unsigned int *threads,
			       unsigned int *hashes, size_t *globalThreads)
{
	*globalThreads = *threads = 1 << (15 + scan_intensity);
	*hashes = *threads * vectors;
}

static void *gpuminer_thread(void *userdata)
{
	const unsigned long cycle = opt_log_interval / 5 ? : 1;
	struct timeval tv_start, tv_end, diff, tv_workstart;
	struct thr_info *mythr = userdata;
	const int thr_id = mythr->id;
	uint32_t *res, *blank_res;
	double gpu_ms_average = 7;

	size_t globalThreads[1];
	size_t localThreads[1];

	cl_int status;

	_clState *clState = clStates[thr_id];
	const cl_kernel *kernel = &clState->kernel;

	struct work *work = malloc(sizeof(struct work));
	unsigned int threads = 1 << (15 + scan_intensity);
	unsigned const int vectors = clState->preferred_vwidth;
	unsigned int hashes = threads * vectors;
	unsigned int hashes_done = 0;

	/* Request the next work item at 2/3 of the scantime */
	unsigned const int request_interval = opt_scantime * 2 / 3 ? : 1;
	unsigned const long request_nonce = MAXTHREADS / 3 * 2;
	bool requested = true;

	if (opt_dynamic) {
		/* Minimise impact on desktop if we want dynamic mode */
		setpriority(PRIO_PROCESS, 0, 19);
		drop_policy();
	}

	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);

	res = calloc(BUFFERSIZE, 1);
	blank_res = calloc(BUFFERSIZE, 1);

	if (!res || !blank_res) {
		applog(LOG_ERR, "Failed to calloc in gpuminer_thread");
		goto out;
	}

	gettimeofday(&tv_start, NULL);
	globalThreads[0] = threads;
	localThreads[0] = clState->work_size;
	diff.tv_sec = 0;
	gettimeofday(&tv_end, NULL);

	status = clEnqueueWriteBuffer(clState->commandQueue, clState->outputBuffer, CL_TRUE, 0,
			BUFFERSIZE, blank_res, 0, NULL, NULL);
	if (unlikely(status != CL_SUCCESS))
		{ applog(LOG_ERR, "Error: clEnqueueWriteBuffer failed."); goto out; }
	gettimeofday(&tv_workstart, NULL);
	/* obtain new work from internal workio thread */
	if (unlikely(!get_work(work, requested, mythr, thr_id))) {
		applog(LOG_ERR, "work retrieval failed, exiting "
			"gpu mining thread %d", thr_id);
		goto out;
	}
	mythr->cgpu->getworks++;
	requested = false;
	precalc_hash(&work->blk, (uint32_t *)(work->midstate), (uint32_t *)(work->data + 64));
	work->blk.nonce = 0;

	while (1) {
		struct timeval tv_gpustart, tv_gpuend;
		suseconds_t gpu_us;

		gettimeofday(&tv_gpustart, NULL);
		timeval_subtract(&diff, &tv_gpustart, &tv_gpuend);
		/* This finish flushes the readbuffer set with CL_FALSE later */
		clFinish(clState->commandQueue);
		gettimeofday(&tv_gpuend, NULL);
		timeval_subtract(&diff, &tv_gpuend, &tv_gpustart);
		gpu_us = diff.tv_sec * 1000000 + diff.tv_usec;
		gpu_ms_average = ((gpu_us / 1000) + gpu_ms_average * 0.9) / 1.9;
		if (opt_dynamic) {
			/* Try to not let the GPU be out for longer than 6ms, but
			 * increase intensity when the system is idle, unless
			 * dynamic is disabled. */
			if (gpu_ms_average > 7) {
				if (scan_intensity > 0)
					scan_intensity--;
				set_threads_hashes(vectors, &threads, &hashes, globalThreads);
			} else if (gpu_ms_average < 3) {
				if (scan_intensity < 14)
					scan_intensity++;
				set_threads_hashes(vectors, &threads, &hashes, globalThreads);
			}
		}

		if (diff.tv_sec > opt_scantime ||
		    work->blk.nonce >= MAXTHREADS - hashes ||
		    work_restart[thr_id].restart ||
		    stale_work(work)) {
			/* Ignore any reads since we're getting new work and queue a clean buffer */
			status = clEnqueueWriteBuffer(clState->commandQueue, clState->outputBuffer, CL_FALSE, 0,
					BUFFERSIZE, blank_res, 0, NULL, NULL);
			if (unlikely(status != CL_SUCCESS))
				{ applog(LOG_ERR, "Error: clEnqueueWriteBuffer failed."); goto out; }
			memset(res, 0, BUFFERSIZE);

			gettimeofday(&tv_workstart, NULL);
			/* obtain new work from internal workio thread */
			if (unlikely(!get_work(work, requested, mythr, thr_id))) {
				applog(LOG_ERR, "work retrieval failed, exiting "
					"gpu mining thread %d", thr_id);
				goto out;
			}
			mythr->cgpu->getworks++;
			requested = false;

			precalc_hash(&work->blk, (uint32_t *)(work->midstate), (uint32_t *)(work->data + 64));
			work->blk.nonce = 0;
			work_restart[thr_id].restart = 0;

			if (opt_debug)
				applog(LOG_DEBUG, "getwork thread %d", thr_id);
			/* Flushes the writebuffer set with CL_FALSE above */
			clFinish(clState->commandQueue);
		}
		status = queue_kernel_parameters(clState, &work->blk);
		if (unlikely(status != CL_SUCCESS))
			{ applog(LOG_ERR, "Error: clSetKernelArg of all params failed."); goto out; }

		/* MAXBUFFERS entry is used as a flag to say nonces exist */
		if (res[MAXBUFFERS]) {
			/* Clear the buffer again */
			status = clEnqueueWriteBuffer(clState->commandQueue, clState->outputBuffer, CL_FALSE, 0,
					BUFFERSIZE, blank_res, 0, NULL, NULL);
			if (unlikely(status != CL_SUCCESS))
				{ applog(LOG_ERR, "Error: clEnqueueWriteBuffer failed."); goto out; }
			if (opt_debug)
				applog(LOG_DEBUG, "GPU %d found something?", dev_from_id(thr_id));
			postcalc_hash_async(mythr, work, res);
			memset(res, 0, BUFFERSIZE);
			clFinish(clState->commandQueue);
		}

		status = clEnqueueNDRangeKernel(clState->commandQueue, *kernel, 1, NULL,
				globalThreads, localThreads, 0,  NULL, NULL);
		if (unlikely(status != CL_SUCCESS))
			{ applog(LOG_ERR, "Error: Enqueueing kernel onto command queue. (clEnqueueNDRangeKernel)"); goto out; }

		status = clEnqueueReadBuffer(clState->commandQueue, clState->outputBuffer, CL_FALSE, 0,
				BUFFERSIZE, res, 0, NULL, NULL);
		if (unlikely(status != CL_SUCCESS))
			{ applog(LOG_ERR, "Error: clEnqueueReadBuffer failed. (clEnqueueReadBuffer)"); goto out;}

		gettimeofday(&tv_end, NULL);
		timeval_subtract(&diff, &tv_end, &tv_start);
		hashes_done += hashes;
		work->blk.nonce += hashes;
		if (diff.tv_usec > 500000)
			diff.tv_sec++;
		if (diff.tv_sec >= cycle) {
			hashmeter(thr_id, &diff, hashes_done);
			gettimeofday(&tv_start, NULL);
			hashes_done = 0;
		}

		timeval_subtract(&diff, &tv_end, &tv_workstart);
		if (!requested && (diff.tv_sec > request_interval || work->blk.nonce > request_nonce)) {
			if (unlikely(!queue_request())) {
				applog(LOG_ERR, "Failed to queue_request in gpuminer_thread %d", thr_id);
				goto out;
			}
			requested = true;
		}
	}
out:
	tq_freeze(mythr->q);

	return NULL;
}
#endif /* HAVE_OPENCL */

static void restart_threads(bool longpoll)
{
	int i;

	/* Discard old queued requests and get new ones */
	flush_requests(longpoll);

	for (i = 0; i < mining_threads; i++)
		work_restart[i].restart = 1;
}

/* Stage another work item from the work returned in a longpoll */
static void convert_to_work(json_t *val)
{
	struct work *work;
	bool rc;

	work = calloc(sizeof(*work), 1);
	if (unlikely(!work)) {
		applog(LOG_ERR, "OOM in convert_to_work");
		return;
	}

	rc= work_decode(json_object_get(val, "result"), work);
	if (unlikely(!rc)) {
		applog(LOG_ERR, "Could not convert longpoll data to work");
		return;
	}
	work->pool = current_pool();

	if (unlikely(!tq_push(thr_info[stage_thr_id].q, work)))
		applog(LOG_ERR, "Could not tq_push work in convert_to_work");
	else if (opt_debug)
		applog(LOG_DEBUG, "Converted longpoll data to work");
}

static void *longpoll_thread(void *userdata)
{
	struct thr_info *mythr = userdata;
	CURL *curl = NULL;
	char *copy_start, *hdr_path, *lp_url = NULL;
	bool need_slash = false;
	int failures = 0;
	struct pool *pool = current_pool();

	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);

	curl = curl_easy_init();
	if (unlikely(!curl)) {
		applog(LOG_ERR, "CURL initialisation failed");
		goto out;
	}

	/* Longpoll sits waiting on next pushed url */
next_path:
	hdr_path = tq_pop(mythr->q, NULL);
	if (!hdr_path) {
		applog(LOG_WARNING, "No long-poll found on this server");
		goto next_path;
	}

	/* full URL */
	if (strstr(hdr_path, "://")) {
		lp_url = hdr_path;
		hdr_path = NULL;
	}
	
	/* absolute path, on current server */
	else {
		copy_start = (*hdr_path == '/') ? (hdr_path + 1) : hdr_path;
		if (pool->rpc_url[strlen(pool->rpc_url) - 1] != '/')
			need_slash = true;

		lp_url = malloc(strlen(pool->rpc_url) + strlen(copy_start) + 2);
		if (!lp_url)
			goto out;

		sprintf(lp_url, "%s%s%s", pool->rpc_url, need_slash ? "/" : "", copy_start);
	}
	free(hdr_path);

	applog(LOG_WARNING, "Long-polling activated for %s", lp_url);

	while (1) {
		struct timeval start, end;
		json_t *val;

		gettimeofday(&start, NULL);
		val = json_rpc_call(curl, lp_url, pool->rpc_userpass, rpc_req,
				    false, true, pool);
		if (likely(val)) {
			/* Keep track of who ordered a restart_threads to make
			 * sure it's only done once per new block */
			if (likely(!strncmp(longpoll_block, blank, 36) ||
				!strncmp(longpoll_block, current_block, 36))) {
					new_blocks++;
					applog(LOG_WARNING, "LONGPOLL detected new block on network, waiting on fresh work");
					restart_threads(true);
			} else
				applog(LOG_WARNING, "LONGPOLL received after new block already detected");

			convert_to_work(val);
			failures = 0;
			json_decref(val);
		} else {
			/* Some pools regularly drop the longpoll request so
			 * only see this as longpoll failure if it happens
			 * immediately and just restart it the rest of the
			 * time. */
			gettimeofday(&end, NULL);
			if (end.tv_sec - start.tv_sec > 30)
				continue;
			if (failures++ < 10) {
				sleep(30);
				applog(LOG_WARNING,
					"longpoll failed, sleeping for 30s");
			} else {
				applog(LOG_ERR,
					"longpoll failed, ending thread");
				goto out;
			}
		}
		memcpy(longpoll_block, current_block, 36);
		if (pool != current_pool()) {
			applog(LOG_WARNING, "Attempting to change longpoll servers");
			pool = current_pool();
			have_longpoll = false;
			goto next_path;
		}
	}

out:
	free(lp_url);
	tq_freeze(mythr->q);
	if (curl)
		curl_easy_cleanup(curl);

	return NULL;
}

static void reinit_cputhread(int thr_id)
{
	struct thr_info *thr = &thr_info[thr_id];

	tq_freeze(thr->q);
	if (!(pthread_cancel(thr->pth)) && pthread_join(thr->pth, NULL)) {
		applog(LOG_ERR, "Failed to pthread_join in reinit_cputhread");
		goto failed_out;
	}

	applog(LOG_INFO, "Reinit CPU thread %d", thr_id);
	tq_thaw(thr->q);

	thread_reportin(thr);

	if (unlikely(pthread_create(&thr->pth, NULL, miner_thread, thr))) {
		applog(LOG_ERR, "thread %d create failed", thr_id);
		goto failed_out;
	}
	return;

failed_out:
	kill_work();
}

#ifdef HAVE_OPENCL
static void reinit_gputhread(int thr_id)
{
	int gpu = dev_from_id(thr_id);
	struct thr_info *thr = &thr_info[thr_id];
	char name[256];

	tq_freeze(thr->q);
	if (!(pthread_cancel(thr->pth)) && pthread_join(thr->pth, NULL)) {
		applog(LOG_ERR, "Failed to pthread_join in reinit_gputhread");
		goto failed_out;
	}
	free(clStates[thr_id]);

	applog(LOG_INFO, "Reinit GPU thread %d", thr_id);
	tq_thaw(thr->q);
	clStates[thr_id] = initCl(gpu, name, sizeof(name));
	if (!clStates[thr_id]) {
		applog(LOG_ERR, "Failed to reinit GPU thread %d", thr_id);
		goto failed_out;
	}
	applog(LOG_INFO, "initCl() finished. Found %s", name);

	thread_reportin(thr);

	if (unlikely(pthread_create(&thr->pth, NULL, gpuminer_thread, thr))) {
		applog(LOG_ERR, "thread %d create failed", thr_id);
		goto failed_out;
	}
	return;

failed_out:
	kill_work();
}

static void reinit_thread(int thr_id)
{
	if (thr_id < gpu_threads)
		reinit_gputhread(thr_id);
	else
		reinit_cputhread(thr_id);
}
#else /* HAVE_OPENCL */
static void reinit_thread(int thr_id)
{
	reinit_cputhread(thr_id);
}
#endif

/* Determine which are the first threads belonging to a device and if they're
 * active */
static bool active_device(int thr_id)
{
	if (thr_id < gpu_threads) {
		if (thr_id >= total_devices)
			return false;
		if (!gpu_devices[dev_from_id(thr_id)])
			return false;
	} else if (thr_id > gpu_threads + num_processors)
		return false;
	return true;
}

/* Makes sure the hashmeter keeps going even if mining threads stall, updates
 * the screen at regular intervals, and restarts threads if they appear to have
 * died. */
static void *watchdog_thread(void *userdata)
{
	const unsigned int interval = opt_log_interval / 2 ? : 1;
	static struct timeval rotate_tv;
	struct timeval zero_tv;

	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);

	memset(&zero_tv, 0, sizeof(struct timeval));
	gettimeofday(&rotate_tv, NULL);

	while (1) {
		int x, y, logx, logy, i;
		struct timeval now;

		sleep(interval);
		if (requests_queued() < opt_queue)
			queue_request();

		hashmeter(-1, &zero_tv, 0);

		if (curses_active) {
			pthread_mutex_lock(&curses_lock);
			getmaxyx(mainwin, y, x);
			getmaxyx(logwin, logy, logx);
			y -= logcursor;
			/* Detect screen size change */
			if (x != logx || y != logy)
				wresize(logwin, y, x);
			for (i = 0; i < mining_threads; i++) {
				if (active_device(i))
					curses_print_status(i);
			}
			redrawwin(logwin);
			redrawwin(statuswin);
			pthread_mutex_unlock(&curses_lock);
		}

		if (unlikely(work_restart[watchdog_thr_id].restart)) {
			restart_threads(false);
			work_restart[watchdog_thr_id].restart = 0;
		}

		gettimeofday(&now, NULL);

		for (i = 0; i < total_pools; i++) {
			struct pool *pool = &pools[i];

			if (!pool->enabled)
				continue;

			/* Test pool is idle once every minute */
			if (pool->idle && now.tv_sec - pool->tv_idle.tv_sec > 60) {
				gettimeofday(&pool->tv_idle, NULL);
				if (pool_active(pool) && pool_tclear(pool, &pool->idle))
					pool_resus(pool);
			}
		}

		if (pool_strategy == POOL_ROTATE && now.tv_sec - rotate_tv.tv_sec > 60 * opt_rotate_period) {
			gettimeofday(&rotate_tv, NULL);
			switch_pools();
		}

		//for (i = 0; i < mining_threads; i++) {
		for (i = 0; i < gpu_threads; i++) {
			struct thr_info *thr = &thr_info[i];

			/* Thread is waiting on getwork, don't test it */
			if (thr->getwork)
				continue;
	
			if (now.tv_sec - thr->last.tv_sec > 60) {
				applog(LOG_ERR, "Attempting to restart thread %d, idle for more than 60 seconds", i);
				/* Create one mandatory work item */
				inc_staged(current_pool(), 1, true);
				if (unlikely(!queue_request())) {
					applog(LOG_ERR, "Failed to queue_request in watchdog_thread");
					kill_work();
					break;
				}
				reinit_thread(i);
				applog(LOG_WARNING, "Thread %d restarted", i);
			}
		}
	}

	return NULL;
}

static void print_summary(void)
{
	struct timeval diff;
	int hours, mins, secs, i;
	double utility, efficiency = 0.0;

	timeval_subtract(&diff, &total_tv_end, &total_tv_start);
	hours = diff.tv_sec / 3600;
	mins = (diff.tv_sec % 3600) / 60;
	secs = diff.tv_sec % 60;

	utility = total_accepted / ( total_secs ? total_secs : 1 ) * 60;
	efficiency = total_getworks ? total_accepted * 100.0 / total_getworks : 0.0;

	printf("\nSummary of runtime statistics:\n\n");
	printf("Started at %s\n", datestamp);
	printf("Runtime: %d hrs : %d mins : %d secs\n", hours, mins, secs);
	if (total_secs)
		printf("Average hashrate: %.1f Megahash/s\n", total_mhashes_done / total_secs);
	printf("Queued work requests: %d\n", total_getworks);
	printf("Share submissions: %d\n", total_accepted + total_rejected);
	printf("Accepted shares: %d\n", total_accepted);
	printf("Rejected shares: %d\n", total_rejected);
	if (total_accepted || total_rejected)
		printf("Reject ratio: %.1f\n", (double)(total_rejected * 100) / (double)(total_accepted + total_rejected));
	printf("Hardware errors: %d\n", hw_errors);
	printf("Efficiency (accepted / queued): %.0f%%\n", efficiency);
	printf("Utility (accepted shares / min): %.2f/min\n\n", utility);

	printf("Discarded work due to new blocks: %d\n", total_discarded);
	printf("Stale submissions discarded due to new blocks: %d\n", total_stale);
	printf("Unable to get work from server occasions: %d\n", total_lo);
	printf("Work items generated locally: %d\n", local_work);
	printf("Submitting work remotely delay occasions: %d\n", total_ro);
	printf("New blocks detected on network: %d\n\n", new_blocks);

	if (total_pools > 1) {
		for (i = 0; i < total_pools; i++) {
			struct pool *pool = &pools[i];

			printf("Pool: %s\n", pool->rpc_url);
			printf(" Queued work requests: %d\n", pool->getwork_requested);
			printf(" Share submissions: %d\n", pool->accepted + pool->rejected);
			printf(" Accepted shares: %d\n", pool->accepted);
			printf(" Rejected shares: %d\n", pool->rejected);
			if (pool->accepted || pool->rejected)
				printf(" Reject ratio: %.1f\n", (double)(pool->rejected * 100) / (double)(pool->accepted + pool->rejected));
			efficiency = pool->getwork_requested ? pool->accepted * 100.0 / pool->getwork_requested : 0.0;
			printf(" Efficiency (accepted / queued): %.0f%%\n", efficiency);

			printf(" Discarded work due to new blocks: %d\n", pool->discarded_work);
			printf(" Stale submissions discarded due to new blocks: %d\n", pool->stale_shares);
			printf(" Unable to get work from server occasions: %d\n", pool->localgen_occasions);
			printf(" Submitting work remotely delay occasions: %d\n\n", pool->remotefail_occasions);
		}
	}

	printf("Summary of per device statistics:\n\n");
	for (i = 0; i < mining_threads; i++) {
		if (active_device(i))
			print_status(i);
	}
	printf("\n");
}

static void quit(int status, const char *format, ...)
{
	va_list ap;

	disable_curses();
	if (format) {
		va_start(ap, format);
		vfprintf(stderr, format, ap);
		va_end(ap);
	}
	fprintf(stderr, "\n");
	fflush(stderr);

	exit(status);
}

static char *curses_input(const char *query)
{
	char *input;

	input = malloc(255);
	if (!input)
		quit(1, "Failed to malloc input");
	leaveok(logwin, false);
	wprintw(logwin, "%s: ", query);
	wrefresh(logwin);
	wgetnstr(logwin, input, 255);
	leaveok(logwin, true);
	return input;
}

static void input_pool(void)
{
	char *url, *user, *pass, *seterr;

	echo();
	immedok(logwin, true);
	wprintw(logwin, "Input server details.\n");

	url = curses_input("URL");
	seterr = set_url(url, NULL);
	if (seterr)
		quit(1, "%s", seterr);

	user = curses_input("Username");
	seterr = set_user(user, NULL);
	if (seterr)
		quit(1, "%s", seterr);

	pass = curses_input("Password");
	seterr = set_pass(pass, NULL);
	if (seterr)
		quit(1, "%s", seterr);

	wclear(logwin);
	immedok(logwin, false);
	noecho();
}

int main (int argc, char *argv[])
{
	unsigned int i, j = 0, x, y, pools_active = 0;
	struct sigaction handler;
	struct thr_info *thr;
	char name[256];
	struct tm tm;

	/* This dangerous functions tramples random dynamically allocated
	 * variables so do it before anything at all */
	if (unlikely(curl_global_init(CURL_GLOBAL_ALL)))
		quit(1, "Failed to curl_global_init");

	if (unlikely(pthread_mutex_init(&hash_lock, NULL)))
		quit(1, "Failed to pthread_mutex_init");
	if (unlikely(pthread_mutex_init(&qd_lock, NULL)))
		quit(1, "Failed to pthread_mutex_init");
	if (unlikely(pthread_mutex_init(&stgd_lock, NULL)))
		quit(1, "Failed to pthread_mutex_init");
	if (unlikely(pthread_mutex_init(&curses_lock, NULL)))
		quit(1, "Failed to pthread_mutex_init");
	if (unlikely(pthread_mutex_init(&control_lock, NULL)))
		quit(1, "Failed to pthread_mutex_init");

	handler.sa_handler = &sighandler;
	sigaction(SIGTERM, &handler, &termhandler);
	sigaction(SIGINT, &handler, &inthandler);

	gettimeofday(&total_tv_start, NULL);
	gettimeofday(&total_tv_end, NULL);
	localtime_r(&total_tv_start.tv_sec, &tm);
	sprintf(datestamp, "[%d-%02d-%02d %02d:%02d:%02d]",
		tm.tm_year + 1900,
		tm.tm_mon + 1,
		tm.tm_mday,
		tm.tm_hour,
		tm.tm_min,
		tm.tm_sec);

	for (i = 0; i < 36; i++) {
		strcat(blank, "0");
		strcat(current_block, "0");
		strcat(longpoll_block, "0");
	}

#ifdef WIN32
	opt_n_threads = num_processors = 1;
#else
	num_processors = sysconf(_SC_NPROCESSORS_ONLN);
	opt_n_threads = num_processors;
#endif /* !WIN32 */

#ifdef HAVE_OPENCL
	for (i = 0; i < 16; i++)
		gpu_devices[i] = false;
	nDevs = clDevicesNum();
	if (nDevs < 0)
		quit(1, "clDevicesNum returned error");
#endif
	if (nDevs)
		opt_n_threads = 0;

	trpc_url = strdup(DEF_RPC_URL);

	/* parse command line */
	opt_register_table(opt_config_table,
			   "Options for both config file and command line");
	opt_register_table(opt_cmdline_table,
			   "Options for command line only");

	opt_parse(&argc, argv, applog_and_exit);
	if (argc != 1)
		quit(1, "Unexpected extra commandline arguments");

	if (total_devices) {
		if (total_devices > nDevs)
			quit(1, "More devices specified than exist");
		for (i = 0; i < 16; i++)
			if (gpu_devices[i] && i + 1 > nDevs)
				quit (1, "Command line options set a device that doesn't exist");
		gpu_threads = total_devices * opt_g_threads;
	} else {
		gpu_threads = nDevs * opt_g_threads;
		for (i = 0; i < nDevs; i++)
			gpu_devices[i] = true;
		total_devices = nDevs;
	}

	if (!gpu_threads && !forced_n_threads) {
		/* Maybe they turned GPU off; restore default CPU threads. */
		opt_n_threads = num_processors;
	}

	logcursor = 7;
	gpucursor = logcursor;
	cpucursor = gpucursor + nDevs;
	logstart = cpucursor + (opt_n_threads ? num_processors : 0) + 1;
	logcursor = logstart + 1;

	/* Set up the ncurses interface */
	if (!opt_quiet && use_curses) {
		mainwin = initscr();
		getmaxyx(mainwin, y, x);
		statuswin = newwin(logstart, x, 0, 0);
		leaveok(statuswin, true);
		logwin = newwin(y - logcursor, 0, logcursor, 0);
		idlok(logwin, true);
		scrollok(logwin, true);
		leaveok(logwin, true);
		cbreak();
		noecho();
		test_and_set(&curses_active);
	}

	if (!total_pools) {
		if (curses_active)
			input_pool();
		else
			quit(1, "No server specified");
	}

	for (i = 0; i < total_pools; i++) {
		struct pool *pool = &pools[i];

		if (!pool->rpc_userpass) {
			if (!pool->rpc_user || !pool->rpc_pass)
				quit(1, "No login credentials supplied for pool %u %s", i, pool->rpc_url);
			pool->rpc_userpass = malloc(strlen(pool->rpc_user) + strlen(pool->rpc_pass) + 2);
			if (!pool->rpc_userpass)
				quit(1, "Failed to malloc userpass");
			sprintf(pool->rpc_userpass, "%s:%s", pool->rpc_user, pool->rpc_pass);
		} else {
			pool->rpc_user = malloc(strlen(pool->rpc_userpass));
			if (!pool->rpc_user)
				quit(1, "Failed to malloc user");
			strcpy(pool->rpc_user, pool->rpc_userpass);
			pool->rpc_user = strtok(pool->rpc_user, ":");
			if (!pool->rpc_user)
				quit(1, "Failed to find colon delimiter in userpass");
		}
	}
	/* Set the current pool to pool 0 */
	currentpool = pools;

#ifdef HAVE_SYSLOG_H
	if (use_syslog)
		openlog("cpuminer", LOG_PID, LOG_USER);
#endif

	mining_threads = opt_n_threads + gpu_threads;

	total_threads = mining_threads + 5;
	work_restart = calloc(total_threads, sizeof(*work_restart));
	if (!work_restart)
		quit(1, "Failed to calloc work_restart");

	thr_info = calloc(total_threads, sizeof(*thr));
	if (!thr_info)
		quit(1, "Failed to calloc thr_info");

	/* init workio thread info */
	work_thr_id = mining_threads;
	thr = &thr_info[work_thr_id];
	thr->id = work_thr_id;
	thr->q = tq_new();
	if (!thr->q)
		quit(1, "Failed to tq_new");

	/* start work I/O thread */
	if (pthread_create(&thr->pth, NULL, workio_thread, thr)) 
		quit(1, "workio thread create failed");

	/* init longpoll thread info */
	if (want_longpoll) {
		longpoll_thr_id = mining_threads + 1;
		thr = &thr_info[longpoll_thr_id];
		thr->id = longpoll_thr_id;
		thr->q = tq_new();
		if (!thr->q)
			quit(1, "Failed to tq_new");

		/* start longpoll thread */
		if (unlikely(pthread_create(&thr->pth, NULL, longpoll_thread, thr)))
			quit(1, "longpoll thread create failed");
		pthread_detach(thr->pth);
	} else
		longpoll_thr_id = -1;

	if (opt_n_threads ) {
		cpus = calloc(num_processors, sizeof(struct cgpu_info));
		if (unlikely(!cpus))
			quit(1, "Failed to calloc cpus");
	}
	if (gpu_threads) {
		gpus = calloc(nDevs, sizeof(struct cgpu_info));
		if (unlikely(!gpus))
			quit(1, "Failed to calloc gpus");
	}

	stage_thr_id = mining_threads + 3;
	thr = &thr_info[stage_thr_id];
	thr->q = tq_new();
	if (!thr->q)
		quit(1, "Failed to tq_new");
	/* start stage thread */
	if (pthread_create(&thr->pth, NULL, stage_thread, thr))
		quit(1, "stage thread create failed");
	pthread_detach(thr->pth);

	/* Flag the work as ready forcing the mining threads to wait till we
	 * actually put something into the queue */
	inc_staged(current_pool(), mining_threads, true);

	/* Create a unique get work queue */
	getq = tq_new();
	if (!getq)
		quit(1, "Failed to create getq");

	/* Test each pool to see if we can retrieve and use work and for what
	 * it supports */
	for (i = 0; i < total_pools; i++) {
		struct pool *pool;

		pool = &pools[i];
		if (pool_active(pool)) {
			applog(LOG_INFO, "Pool %d %s active", pool->pool_no, pool->rpc_url);
			pools_active++;
			pool->enabled = true;
		} else
			applog(LOG_WARNING, "Unable to get work from pool %d %s", pool->pool_no, pool->rpc_url);
	}

	if (!pools_active)
		quit(0, "No pools active! Exiting.");

#ifdef HAVE_OPENCL
	i = 0;

	/* Hopefully remove stale references to allow binaries to build */
	if (nDevs)
		clUnloadCompiler();

	/* start GPU mining threads */
	for (j = 0; j < nDevs * opt_g_threads; j++) {
		int gpu = j % nDevs;

		gpus[gpu].is_gpu = 1;
		gpus[gpu].cpu_gpu = gpu;

		/* Skip devices not set to mine */
		if (!gpu_devices[gpu])
			continue;

		thr = &thr_info[i];
		thr->id = i;
		thr->cgpu = &gpus[gpu];

		thr->q = tq_new();
		if (!thr->q)
			quit(1, "tq_new failed in starting gpu mining threads");

		applog(LOG_INFO, "Init GPU thread %i", i);
		clStates[i] = initCl(gpu, name, sizeof(name));
		if (!clStates[i]) {
			applog(LOG_ERR, "Failed to init GPU thread %d", i);
			continue;
		}
		applog(LOG_INFO, "initCl() finished. Found %s", name);

		thread_reportin(thr);

		if (unlikely(pthread_create(&thr->pth, NULL, gpuminer_thread, thr)))
			quit(1, "thread %d create failed", i);
		i++;
	}

	/* Free up resources */
	if (nDevs)
		clUnloadCompiler();

	applog(LOG_INFO, "%d gpu miner threads started", gpu_threads);
#endif

	/* start CPU mining threads */
	for (i = gpu_threads; i < mining_threads; i++) {
		int cpu = (i - gpu_threads) % num_processors;

		thr = &thr_info[i];

		thr->id = i;
		cpus[cpu].cpu_gpu = cpu;
		thr->cgpu = &cpus[cpu];

		thr->q = tq_new();
		if (!thr->q)
			quit(1, "tq_new failed in starting cpu mining threads");

		thread_reportin(thr);

		if (unlikely(pthread_create(&thr->pth, NULL, miner_thread, thr)))
			quit(1, "thread %d create failed", i);
	}

	applog(LOG_INFO, "%d cpu miner threads started, "
		"using SHA256 '%s' algorithm.",
		opt_n_threads,
		algo_names[opt_algo]);

	watchdog_thr_id = mining_threads + 2;
	thr = &thr_info[watchdog_thr_id];
	/* start wakeup thread */
	if (pthread_create(&thr->pth, NULL, watchdog_thread, NULL))
		quit(1, "wakeup thread create failed");

	/* Restart count as it will be wrong till all threads are started */
	pthread_mutex_lock(&hash_lock);
	gettimeofday(&total_tv_start, NULL);
	gettimeofday(&total_tv_end, NULL);
	total_mhashes_done = 0;
	pthread_mutex_unlock(&hash_lock);

	/* Now that everything's ready put enough work in the queue */
	for (i = 0; i < opt_queue + mining_threads; i++) {
		if (unlikely(!queue_request()))
			quit(1, "Failed to queue_request in main");
		if (!opt_quiet)
			print_status(i);
	}

	/* Create curses input thread for keyboard input */
	input_thr_id = mining_threads + 4;
	thr = &thr_info[input_thr_id];
	if (pthread_create(&thr->pth, NULL, input_thread, thr))
		quit(1, "input thread create failed");
	pthread_detach(thr->pth);

	/* main loop - simply wait for workio thread to exit */
	pthread_join(thr_info[work_thr_id].pth, NULL);
	applog(LOG_INFO, "workio thread dead, exiting.");

	gettimeofday(&total_tv_end, NULL);
	disable_curses();
	if (!opt_quiet && successful_connect)
		print_summary();

	if (gpu_threads)
		free(gpus);
	if (opt_n_threads)
		free(cpus);
	if (pools)
		free(pools);

	curl_global_cleanup();

	return 0;
}