pthread_cond_signal
调用pthread_cond_signal的时候最好不要pthread_mutex_lock保护， SUSv2标准是这样说的 "The pthread_cond_signal() or pthread_cond_broadcast() functions may be called by a thread whether or not it currently owns the mutex that threads calling pthread_cond_wait() or pthread_cond_timedwait() have associated with the condition variable during their waits;however, if predictable scheduling behaviour is requ...
by UnixStudier - C/C++ - 2010-07-17 00:06:01 阅读（1421） 回复（1）
pthread_cond_signal()的具体位置？ 我在《linux下的多线程编程》http://www.fanqiang.com/a4/b8/20010811/0905001105.html中看到： pthread_cond_signal()必须要放在pthread_mutex_lock() 和pthread_mutex_unlock() 之间， 不然有可能造成无限制的等待。我感觉这这种调用方式是对的，但为什么不这样调用就有可能造成无限制等待，还不是很清楚？？？？ 在这个地方看到了符合这个规则的调用： http://www.ccert.edu.cn/forum/show...
man pthread_cond_signal [code] The pthread_cond_signal() function shall unblock at least one of the threads that are blocked on the specified condition variable cond (if any threads are blocked on cond). [/code]
在man pthread_cond_signal里面看到这样一句话： It is not safe to use the pthread_cond_signal() function in a signal handler that is invoked asynchronously. Even if it were safe, there would still be a race between the test of the Boolean pthread_cond_wait() that could not be efficiently eliminated. 看的迷迷乎乎，是不是说pthread_cond_signal不能在异步调用的信号处理程序 使用？ 否则...
书上一般使用pthread_cond_wait是这样用的： 条件变量V初始化，互斥量V初始化； pthread_mutex_lock(&m); while(!wait_condition) pthread_cond_wait(&v, &m); pthread_mutex_unlock(&m); 之所以要用 while(condition) pthread_cond_wait(&v, &m)这种结构，是为了防止pthread_cond_wait由于错误的pthread_cond_signal（）或者收到信号而返回 我的疑问是： 什么信号能使pthread_cond_wait()返回呢？我实验了一下SIGUSR1这个...
一个线程用pthread_cond_broadcast函数向其他线程发送信号 当程序运行一段时间以后 调用pthread_cond_broadcast函数的线程CPU占用率达100％ 其他线程都停掉了 希望有知道的给解释一下 有没有什么函数可替换
//n 个线程 pthread_mutex_lock(&(pool->queue_lock); if (!pool->Cur_queue_size ) { pthread_cond_wait (&(pool->queue_ready), &(pool->queue_lock)); } //一些操作后 pthread_mutex_unlock(&(pool->queue_lock)); 另外一个线程 while(1) { if (pthread_mutex_trylock (&(pool->queue_lock)) == 0) { //一些操作后 pthread_mutex_unlock (&(pool->queue_lock)); pthread_cond_signal (&(pool->queue_ready)); brea...
pthread_timestruc_t to; pthread_mutex_t m; pthread_cond_t c; ... pthread_mutex_lock(&m); to.tv_sec = time(NULL) + 2; to.tv_nsec = 0; while (cond == FALSE) { err = pthread_cond_timedwait(&c, &m, &to); if (err == ETIMEDOUT) { //一直都是ETIMEDOUT,何解? /* timeout, do something */ break; } } pthread_mutex_unlock(&m); 我已经signal了，还是返回timedout。signal后，用 pthread_c...
