linux 线程挂起恢复的简单示例

转自
http://blog.csdn.net/honghuzhilangzixin/article/details/7908236


参考：

http://blog.csdn.net/chennxi/article/details/6234529《Linux下线程的挂起和恢复》

写了个demo：

#include <unistd.h>
#include <pthread.h>

static pthread_mutex_t mutex;
static pthread_cond_t cond;
static int flag = 0;

void srpthread_init()
{
	pthread_mutex_init(&mutex,NULL);
	pthread_cond_init(&cond,NULL);
}

void srpthread_suspend()
{
	pthread_mutex_lock(&mutex);
	flag--;
	pthread_mutex_unlock(&mutex);
}


void srpthread_resume()
{
	pthread_mutex_lock(&mutex);
	flag++;
	pthread_cond_signal(&cond);
	pthread_mutex_unlock(&mutex);
}

void *thread_run()
{
	while(1)
	{
		pthread_mutex_lock(&mutex);
		while(flag<=0)
		{
			pthread_cond_wait(&cond,&mutex);
		}

		pthread_mutex_unlock(&mutex);

		//actual work
		printf("i am running!\n");
	}

}

int main(int argc,char *argv[])
{
	char ch;
	pthread_t p1;
	srpthread_init();
	pthread_create(&p1,NULL,(void *)thread_run,NULL);

	while(1)
	{
		scanf("%c",&ch);
		switch(ch)
		{
			case 's':
				srpthread_suspend();
				break;
			case 'r':
				srpthread_resume();
				break;
			default:
				break;
		}
	}
#if 0
	printf("1111\n");
	srpthread_resume();
	printf("2222\n");
	sleep(3);
	printf("3333\n");
	srpthread_suspend();
	printf("4444\n");
#endif
	return 1;
}

编译命令：

gcc file.c -o file lpthread