Linux C线程与信号简单示例

/*
一个线程写，一个线程读，通过信号来实现同步
*/


#include"stdio.h"
#include"pthread.h"
#include"string.h"
#include"semaphore.h"

#define Success 0
#define Failure -1

char g_acBuf[128];
sem_t sem;

void *InputChar()
{
	while(1)
	{
	  
	  printf("plean input array:\n");
	  gets(g_acBuf);
	  sem_post(&sem);
	}
}

void *OutputLen()
{
	int iNum;
	while(1)
	{
	  sem_wait(&sem);
	  iNum = strlen(g_acBuf);
	  printf("input array'len is %d\n",iNum);
	  
	}
}


int main()
{
	int err;
	pthread_t tid;
	sem_init(&sem,0,0);
	
	err=pthread_create(&tid,NULL,InputChar,NULL);
	if(err=0)
      printf("can’t create thread:%s\n",strerror(err));
      
    err=pthread_create(&tid,NULL,OutputLen,NULL);
	if(err=0)
      printf("can’t create thread:%s\n",strerror(err));
	
	
	
	sem_close(&sem);
	
	sleep(10);
	
	return Success;
}