多线程通信之sempost

参考地址：http://blog.csdn.net/jiazhen/article/details/4293754

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


sem_t smt;  

void DisplayData()  
{  
    printf ("Display a frame/n");  
}  

void *ThreadFuncDisplay(void *arg)  
{     
while (1){  
        printf ("\nsem_wait..............................\n");  
        sem_wait (&smt);          
        DisplayData();        
    }  
}  

void *ThreadFuncControl(void *arg)  
{  
while (1){  
        sleep (3);  
        sem_post (&smt);  
        printf ("\nsem_post\n");  
    }  
}  

int main(int argc, char *argv[])  
{  


int rt;  
    pthread_t   pt_dsp;  
    pthread_t   pt_ctrl;  


    rt = sem_init (&smt, 0, 0);  
if (rt){  
        perror ("semaphore initialization failed");  
    }  

    pthread_create (&pt_dsp, NULL, ThreadFuncDisplay, NULL);  
    pthread_create (&pt_ctrl, NULL, ThreadFuncControl, NULL);  


    sleep(10);  
return 0;  
} 

　　

完