Re: starting a pthread in suspended mode

• Subject: Re: starting a pthread in suspended mode
• From: Matt Watson <email@hidden>
• Date: Fri, 18 Oct 2002 00:18:43 -0700

I am looking for a way to create a pthread that is initially suspended.

static int ready_to_go = 0;
static pthread_mutex_t suspend_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t suspend_cond = PTHREAD_COND_INITIALIZER;

static void *func(void *arg) {
	pthread_mutex_lock(&suspend_mutex);
	while (ready_to_go == 0) {
		pthread_cond_wait(&suspend_cond, &suspend_mutex);
	}
	pthread_mutex_unlock(&suspend_mutex);
	/* Now do our thing */
	...
	return NULL;
}

void spawn_thread(void) {
	pthread_attr_t attr;
	pthread_t thread;

	pthread_attr_init(&attr);
	/* We don't need to join this thread */
	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
	pthread_create(&thread, &attr, func, NULL);
	pthread_attr_destroy(&attr);

	/* Do some stuff */
	...
	/* Now tell thread to continue */
	pthread_mutex_lock(&suspend_mutex);
	ready_to_go = 1;
	pthread_mutex_unlock(&suspend_mutex);
	pthread_cond_signal(&suspend_cond);
}

matt.
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