linux 线程中 信号量通信例子

#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)
{
	 printf("thread_function1--------------sem_wait\n");
	 sem_wait(&bin_sem);
	 printf("sem_wait\n");
	 while (1)
	 {

	 }
}

void *thread_function2(void *arg)
{
	 printf("thread_function2--------------sem_post\n");
	 sem_post(&bin_sem);
	 printf("sem_post\n");
	 while (1)
	 {

	 }
}


 
int main()
{
 	int res;
	 pthread_t a_thread;
	 void *thread_result;

	 printf("main()++\n");
	 
	 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)
	 {
	 }
}

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