Implement cgminer locks.

miner.h

@@ -660,6 +660,65 @@ static inline void rwlock_init(pthread_rwlock_t *lock)
 		quit(1, "Failed to pthread_rwlock_init");
 }
 
+/* cgminer locks, a write biased variant of rwlocks */
+struct cglock {
+	pthread_mutex_t mutex;
+	pthread_rwlock_t rwlock;
+};
+
+typedef struct cglock cglock_t;
+
+static inline void cglock_init(cglock_t *lock)
+{
+	mutex_init(&lock->mutex);
+	rwlock_init(&lock->rwlock);
+}
+
+/* Read lock variant of cglock */
+static inline void cg_rlock(cglock_t *lock)
+{
+	mutex_lock(&lock->mutex);
+	rd_lock(&lock->rwlock);
+	mutex_unlock(&lock->mutex);
+}
+
+/* Intermediate variant of cglock */
+static inline void cg_ilock(cglock_t *lock)
+{
+	mutex_lock(&lock->mutex);
+}
+
+/* Upgrade intermediate variant to a write lock */
+static inline void cg_ulock(cglock_t *lock)
+{
+	wr_lock(&lock->rwlock);
+}
+
+/* Write lock variant of cglock */
+static inline void cg_wlock(cglock_t *lock)
+{
+	mutex_lock(&lock->mutex);
+	wr_lock(&lock->rwlock);
+}
+
+/* Downgrade intermediate variant to a read lock */
+static inline void cg_dlock(cglock_t *lock)
+{
+	rd_lock(&lock->rwlock);
+	mutex_unlock(&lock->mutex);
+}
+
+static inline void cg_runlock(cglock_t *lock)
+{
+	rd_unlock(&lock->rwlock);
+}
+
+static inline void cg_wunlock(cglock_t *lock)
+{
+	wr_unlock(&lock->rwlock);
+	mutex_unlock(&lock->mutex);
+}
+
 struct pool;
 
 extern bool opt_protocol;