问线程-暂停/取消暂停所有线程

EN

int paused;
pthread_mutex m;
pthread_cond cond;

void pause_threads(void)
{
    pthread_mutex_lock(&m);
    paused = 1;
    pthread_mutex_unlock(&m);        
}

void unpause_threads(void)
{
    pthread_mutex_lock(&m);
    paused = 0;
    pthread_cond_broadcast(&cond);
    pthread_mutex_unlock(&m);        
}

// Block signals for wait
sigset_t usr_set;

sigemptyset(&usr_set);
sigaddset(&usr_set, SIGUSR1);
sigaddset(&usr_set, SIGUSR2);
pthread_sigmask(SIG_BLOCK, &usr_set, NULL);

// If other threads will be created from given one, they will share signal handling.
// Otherwise actions above should be repeated for new threads.

int sig;
// Repeatedly wait for signals arriving.
while(!sigwait(&usr_set, &sig)) {
    if(sig == SIGUSR1) {
        pause_threads();
    }
    else {
        unpause_threads();
    }
}