linux线程同步

最新推荐文章于 2024-01-10 09:34:16 发布

原创最新推荐文章于 2024-01-10 09:34:16 发布 · 292 阅读

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本文通过一个C语言程序实例介绍了如何使用pthread库实现多线程间的同步操作及条件变量的应用。程序中创建了两个线程，一个用于写入数据到共享字符串并通知读取线程，另一个用于等待数据可用后读取并输出该字符串。

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个人测试：

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

char str[100];
pthread_mutex_t mutex_read,mutex_write;
pthread_cond_t cond_read,cond_write;
void* p1_func(void* arg)
{
  while(1)
  {
    pthread_mutex_lock(&mutex_read);
    pthread_cond_wait(&cond_read,&mutex_read);
    printf("\nstr=%s\n",str);
    pthread_cond_signal(&cond_write);
    pthread_mutex_unlock(&mutex_read);
  }
}
void* p2_func(void* arg)
{
  int i = 0;
  printf("\np2_func\n");
  while(1)
  {
     i++;
     if(i%10==0)
     {
//       printf("\n%d 10\n",i);
       pthread_mutex_lock(&mutex_write);
       sprintf(str,"lock %d",i);
       pthread_cond_signal(&cond_read);
       pthread_cond_wait(&cond_write,&mutex_write);
       pthread_mutex_unlock(&mutex_write);
     }
     sleep(1);
     printf("\n%d\n",i);
  }
}
int main()
{
  pthread_t p1;
  pthread_t p2;
  pthread_mutex_init(&mutex_read,NULL);
  pthread_cond_init(&cond_read,NULL);
  pthread_mutex_init(&mutex_write,NULL);
  pthread_cond_init(&cond_write,NULL);
  pthread_create(&p1,NULL,p1_func,NULL);
  pthread_create(&p2,NULL,p2_func,NULL); 
  pthread_join(p1,NULL);
  pthread_join(p2,NULL);
  pthread_mutex_destroy(&mutex_read);
  pthread_cond_destroy(&cond_read);
  pthread_mutex_destroy(&mutex_write);
  pthread_cond_destroy(&cond_write);
  return 0;
}