c语言线程唤醒机制——pthread_cond_wait

一、pthread_cond_wait（）唤醒函数讲解1.函数原型讲解头文件#include <pthread.h>函数intpthread_cond_wait(pthread_cond_t*cond,pthread_mutex_t*mutex);函数功能：实现线程的睡眠参数1：条件锁参数2：互斥锁二、程序demon#include <stdio.h>#include &l

45°的阳光

4368人浏览 · 2020-08-02 15:32:09

45°的阳光 · 2020-08-02 15:32:09 发布

一、pthread_cond_wait（）唤醒函数讲解
1.函数原型讲解
头文件

#include <pthread.h>

函数

int   pthread_cond_wait(pthread_cond_t   *cond,   pthread_mutex_t   *mutex);

函数功能：实现线程的睡眠
参数1：条件锁
参数2：互斥锁

二、程序demon

#include <stdio.h>
#include <pthread.h>

pthread_t atter;
pthread_mutex_t mutex=PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t function1_cond=PTHREAD_COND_INITIALIZER;

int function_run=0;

void *function1()
{
	pthread_mutex_lock(&mutex);
	printf("======= this is function  1 =====\n");
	while(1){
		printf("======= this is function  2 =====\n");
		while(!function_run) 
		{
			printf("======= this is function  3 ===\n");
			pthread_cond_wait(&function1_cond,&mutex);
		}
		printf("======= this is function  4=====\n");
		function_run=0;
		pthread_mutex_unlock(&mutex);
	}
}

int create_pthread()
{ 
	if (-1 == pthread_create(&atter, NULL, function1, NULL)) {
		printf("Create pthread failed");
		return -1;
	}
	pthread_detach(atter);
	return 0;
}

int main()
{
	create_pthread();
	sleep(2);

	printf("\n第一次唤醒线程\n");
	pthread_mutex_lock(&mutex);
	function_run=1;
	pthread_cond_signal(&function1_cond);
	pthread_mutex_unlock(&mutex);

	sleep(2);
	printf("\n第二次唤醒线程\n");
	pthread_mutex_lock(&mutex);
	function_run=1;
	pthread_cond_signal(&function1_cond);
	pthread_mutex_unlock(&mutex);

	sleep(2);
	printf("\n第三次唤醒线程\n");
	pthread_mutex_lock(&mutex);
	function_run=1;
	pthread_cond_signal(&function1_cond);
	pthread_mutex_unlock(&mutex);

	sleep(2);
	printf("\n第四次唤醒线程\n");
	pthread_mutex_lock(&mutex);
	function_run=1;
	pthread_cond_signal(&function1_cond);
	pthread_mutex_unlock(&mutex);
	
	sleep(2);	
	pthread_detach(atter);
	return 0;
}