test.cpp

/*
*   Copyright (C) 2016, Íõ³¬ [wabcwang] , <wabcwang@gmail.com>.
*   All Rights Reserved.
*/
#include <stdio.h>  
#include <unistd.h>  
#include <stdlib.h>  
#include <string.h>  
#include <pthread.h>  
#include <semaphore.h>  

sem_t bin_sem;  
void *thread_function1(void *arg)  
{  
    int i=0;
    printf("thread_function1--------------sem_wait\n");  
    sem_wait(&bin_sem);     
    for(;;)
    {  
        sem_wait(&bin_sem);
        printf("    sem_wait %d\n",i++);  
    }  
}  
  
void *thread_function2(void *arg)  
{  
    int i=0;

    printf("thread_function2--------------sem_post\n");  
    while (1)  
    {  
        printf("sem_post %d\n",i++);  
        sem_post(&bin_sem); 
        sleep(5);
    }  
}  

int main(int argc, char *argv[])
{  
    int res;  
    pthread_t a_thread;  
    void *thread_result;  
      
    res = sem_init(&bin_sem, 0, 0);  
    if (res != 0)  
    {  
        perror("Semaphore initialization failed");  
    }  

    printf("sem_init\n");  
    res = pthread_create(&a_thread, NULL, thread_function1, NULL);  
    if (res != 0)  
    {  
        perror("Thread creation failure");  
    }  

    printf("thread_function1\n");  
    //sleep (5);  
    printf("sleep\n");  

    res = pthread_create(&a_thread, NULL, thread_function2, NULL);  
    if (res != 0)  
    {  
        perror("Thread creation failure");  
    }  
    while (1)  
    { 
    
    }  
    return 0;
}