Implement pthread_testcancel replacement for BIONIC

compat.h

@@ -150,6 +150,7 @@ typedef long suseconds_t;
 #include <pthread.h>
 #include <signal.h>
 #define pthread_cancel(pth)  pthread_kill(pth, SIGTERM)
+extern void pthread_testcancel(void);
 #ifndef PTHREAD_CANCEL_ENABLE
 #define PTHREAD_CANCEL_ENABLE  0
 #define PTHREAD_CANCEL_DISABLE 1

util.c

@@ -1004,6 +1004,13 @@ void sighandler_pthread_cancel(int sig)
 	do_pthread_cancel_exit(flags);
 }
 
+void pthread_testcancel(void)
+{
+	int flags = (int)pthread_getspecific(key_pcwm);
+	if (flags & PCWM_CANCELLED && !(flags & PCWM_DISABLED))
+		do_pthread_cancel_exit(flags);
+}
+
 int pthread_setcancelstate(int state, int *oldstate)
 {
 	int flags = (int)pthread_getspecific(key_pcwm);