linux c编程 -- 线程互斥

    #include <stdio.h>  
    #include <pthread.h>  
    #include <unistd.h>  
    #include <stdlib.h>  
      
    static int value = 0;  
    pthread_mutex_t mutex;  
      
    void* func(void* args)  
    {  
        while(1)  
        {  
            pthread_mutex_lock(&mutex);  
            sleep(1);  
            value ++;  
            printf("value = %d!
", value);  
            pthread_mutex_unlock(&mutex);  
        }  
    }  
      
    int main()  
    {  
        pthread_t pid1, pid2;  
        pthread_mutex_init(&mutex, NULL);  
      
        if(pthread_create(&pid1, NULL, func, NULL))  
        {  
            return -1;  
        }  
      
        if(pthread_create(&pid2, NULL, func, NULL))  
        {  
            return -1;  
        }  
      
        pthread_join(pid1, NULL);
        pthread_join(pid2, NULL);
      
        return 0;  
    }