linux编程实现三个线程ABC，并让它们顺次打印自己的ID，使用信号量_linux编写程序,创建3个对等线程,假设三个线程id分为abc,-优快云博客

本文详细讲解如何在Linux环境下进行多线程编程，通过信号量机制确保线程A、B、C依次打印自己的ID，实现线程间的同步与协调。

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

static sem_t sem1,sem2,sem3; 
int global = 0;
#define MAX 15

void *t1_exe(void *arg){
     while (global<MAX) { 
         sem_wait(&sem1) ; 
         printf("In thread1 %lu\n",pthread_self());
 		 global++; 
         sem_post(&sem2);
		 sleep(1);  
		}
}
void *t2_exe(void *arg){
      while (global<MAX) { 
         sem_wait(&sem2) ; 
         printf("In thread2 %lu\n",pthread_self());
 		 global++; 
         sem_post(&sem3);
		 sleep(1);  
		} 
}
void *t3_exe(void *arg){
      while (global<MAX) { 
         sem_wait(&sem3) ; 
         printf("In thread3 %lu\n",pthread_self());
 		 global++; 
         sem_post(&sem1);
		 sleep(1);  
		} 
}
void main() 
{
   int i;
   pthread_t t_a[3];
   sem_init(&sem1,0,1);
   sem_init(&sem2,0,0);
   sem_init(&sem3,0,0);
   
   pthread_create(&t_a[0],NULL,t1_exe,(void *)NULL);/*´´½¨*/
   pthread_create(&t_a[1],NULL,t2_exe,(void *)NULL);
   pthread_create(&t_a[2],NULL,t3_exe,(void *)NULL);
   
   for(i=0;i<3;i++)
      pthread_join(t_a[i],NULL);

   sem_destroy(&sem1);
   sem_destroy(&sem2);
   sem_destroy(&sem3);
   return ;
}