linux下互斥锁和条件变量的使用

#include 
#include 
#include 
#include 

pthread_mutex_t mutex;
pthread_cond_t cond;

void * thread1(void *arg)
{
    pthread_cleanup_push (pthread_mutex_unlock,&mutex);

    while(1)
    {
        printf("thread1 is running!\n");
        pthread_mutex_lock(&mutex);
        pthread_cond_wait(&cond,&mutex);
        printf("thread1 applied the condition\n");
        pthread_mutex_unlock(&mutex);
        sleep(4);
    }

    pthread_cleanup_pop (0);
}

void *thread2(void *arg)
{
    while(1)
    {
        printf("thread2 is running!\n");
        pthread_mutex_lock(&mutex);
        pthread_cond_wait(&cond,&mutex);
        printf("thread2 applied the condition!\n");
        pthread_mutex_unlock(&mutex);
        sleep(1);
    }
}

int main(void)
{
    pthread_t thid1,thid2;

    printf("Condition variable study!\n");
    pthread_mutex_init(&mutex, NULL);
    
    pthread_cond_init(&mutex, NULL);
    pthread_create(&thid1, NULL, (void*) thread1, NULL);
    pthread_create(&thid2, NULL, (void*) thread2, NULL);
    do
    {
        pthread_cond_signal(&cond);
    }while(1);
    sleep(10);
    pthread_exit(0);
}