Linux系统编程之pthread多线程与互斥编程

Linux系统编程之pthread多线程与互斥编程

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

int count = 0;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;    // 静态初始化

void* thd_print(void* arg)
{
  while(1)
  {
    pthread_mutex_lock(&mutex);

    count++;
    printf("%s : count = %d \r\n", (char *)arg, count);
    if(count > 5)
    {
      pthread_mutex_unlock(&mutex);
      break;
    }

    pthread_mutex_unlock(&mutex);
    usleep(300 * 1000);
  }

  return NULL;
}

int main(void)
{
  pthread_t pid[2];
  char* thdname[] = {"thread1", "thread2"};

  // 创建线程
  pthread_create(&pid[0], NULL, thd_print, thdname[0]);
  pthread_create(&pid[1], NULL, thd_print, thdname[1]);

  // 等待线程退出回收资源
  pthread_join(pid[0], NULL);
  pthread_join(pid[1], NULL);

  printf("Hello World \r\n");

  return 0;
}