4.4线程同步之互斥量加锁解锁（第二阶段）

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本文通过示例代码介绍了如何使用互斥量进行线程同步，创建并运行了三个线程func1、func2和func3，每个线程在加锁后执行特定操作，然后解锁。主要涉及pthread库的pthread_mutex_init、pthread_mutex_lock和pthread_mutex_unlock等函数，展示了在多线程环境中如何确保数据安全。

4.4线程同步之互斥量加锁解锁（第二阶段）

代码展示

pthread_mutex_lock();//上锁
pthread_mutex_lock();//解锁

要加锁解锁的API

int pthread_mutex_init(pthread_mutex_t *restrict mutex, const pthread_mutexattr_t *restrict attr);

#include <pthread.h>
#include <stdio.h>
//       int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
//                          void *(*start_routine) (void *), void *arg);
//	int pthread_join(pthread_t thread, void **retval);

int g_data = 0;

pthread_mutex_t mutex;


void *func1(void *arg)
{	
	int i;	

	pthread_mutex_lock(&mutex);//上锁

	for(i=0;i<5;i++){
		printf("t1:%ld thread is create\n",(unsigned long)pthread_self());
		printf("t1:param is %d\n",*((int *)arg));
		sleep(1);
	}
	pthread_mutex_unlock(&mutex);
}

void *func2(void *arg)
{	
	pthread_mutex_lock(&mutex);//shangsuo 

	printf("t2:%ld thread is create\n",(unsigned long)pthread_self());
	printf("t2:param is %d\n",*((int *)arg));

	pthread_mutex_unlock(&mutex);

}

void *func3(void *arg)
{	
	pthread_mutex_lock(&mutex);//shangsuo 

	printf("t3:%ld thread is create\n",(unsigned long)pthread_self());
	printf("t3:param is %d\n",*((int *)arg));

	pthread_mutex_unlock(&mutex);

}

int main()
{
	int ret;
	int param = 100;
	pthread_t t1;
	pthread_t t2;
	pthread_t t3;

	//	int pthread_mutex_init(pthread_mutex_t *restrict mutex, const pthread_mutexattr_t *restrict attr);
	pthread_mutex_init(&mutex,NULL);

	ret = pthread_create(&t1,NULL,func1,(void *)&param);
	if(ret == 0){
		printf("main:cread t1 success\n");
	}

	ret = pthread_create(&t2,NULL,func2,(void *)&param);
	if(ret == 0){
		printf("main:cread t2 success\n");
	}

	ret = pthread_create(&t2,NULL,func3,(void *)&param);
	if(ret == 0){
		printf("main:cread t3 success\n");
	}

	printf("main:%ld\n",(unsigned long)pthread_self());
	//	while(1);
	pthread_join(t1,NULL);
	pthread_join(t2,NULL);	

	//	int pthread_mutex_destroy(pthread_mutex_t mutex);
	pthread_mutex_destroy(&mutex);

	return 0;
}```