1. Spuriouswakeup 2. Impractical if not impossible
If successful, thepthread_cond_signal()andpthread_cond_broadcast()functions return0. Otherwise, an error number is returned to indicate the error. ERRORS Thepthread_cond_signal()andpthread_cond_broadcast()function may fail if: EINVAL The valueconddoes not refer to an initialized condition variable...
then a subsequent call topthread_cond_broadcast() orpthread_cond_signal() in that thread shall behave as if it were issued after the about-to-block thread has blocked. Upon successful return, the mutex shall have been locked and shall be owned by the calling thread. When using condition va...
The pthread_cond_signal() and pthread_cond_broadcast() functions have no effect if there are no threads currently blocked on cond. RETURN VALUESIf successful, the pthread_cond_signal() and pthread_cond_broadcast() functions return 0. Otherwise, an error number is returned to indicate the error...
int pthread_cond_wait ( pthread_cond_t * restrict cond, pthread_mutex_t *restrict mutex ); 这里参数cond是条件变量并且mutex是一个互斥的锁变量,这个锁必须提前被线程锁住.当这个函数被执行,调用的线程被强迫释放唯一的锁,释放了之后,线程被挂起直到信号被唤醒.换醒线程的函数是pthread_cond_signal(pthread_...
int pthread_cond_wait ( pthread_cond_t * restrict cond, pthread_mutex_t *restrict mutex ); 这里参数cond是条件变量并且mutex是一个互斥的锁变量,这个锁必须提前被线程锁住.当这个函数被执行,调用的线程被强迫释放唯一的锁,释放了之后,线程被挂起直到信号被唤醒.换醒线程的函数是pthread_cond_signal(pthread_...
pthread_cond_wait 为什么需要传递 mutex 参数？ - 编程 上面这个问题的答案里面大都提到了条件变量的“标准”用法，那就是保证严格notify_N的解决方案。1
--report-signal-unlocked=<yes|no> [default: yes] Whether to report calls to pthread_cond_signal and pthread_cond_broadcast where the mutex associated with the signal through pthread_cond_wait or pthread_cond_timed_waitis not locked at the time the signal is sent. Sending a signal without ...
0 libsystem_pthread.dylib 0x0000000182f7a5cc start_wqthread + 0 Thread 6:: pool-spawner 0 libsystem_kernel.dylib 0x0000000182f48548 __psynch_cvwait + 8 1 libsystem_pthread.dylib 0x0000000182f7fdac _pthread_cond_wait + 1248 2 libglib-2.0.0.dylib 0x00000001035691fc g_cond_wait + 44 3 ...
clock_getres() , nanosleep() , pthread_cond_timedwait() , sleep() , the Base Definitions volume of IEEE Std 1003.1-2001, COPYRIGHT Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy--Portable Operati...