Linux操作系统下的多线程编程详细解析

时间:2007-06-07 03:07:58  来源:站长资讯收集整理  作者:佚名


/* example.c*/
#include
#include
void thread(void)
{
 int i;
 for(i=0;i<3;i++)
  printf("This is a pthread.n");
}

int main(void)
{
 pthread_t id;
 int i,ret;
 ret=pthread_create(&id,NULL,(void *) thread,NULL);
 if(ret!=0){
  printf ("Create pthread error!n");
  exit (1);
 }
 for(i=0;i<3;i++)
  printf("This is the main process.n");
 pthread_join(id,NULL);
 return (0);
}

  我们编译此程序:

gcc example1.c -lpthread -o example1

  运行example1,我们得到如下结果:

This is the main process.
This is a pthread.
This is the main process.
This is the main process.
This is a pthread.
This is a pthread.

  再次运行,我们可能得到如下结果:

This is a pthread.
This is the main process.
This is a pthread.
This is the main process.
This is a pthread.
This is the main process.

  前后两次结果不一样,这是两个线程争夺CPU资源的结果。上面的示例中,我们使用到了两个函数,pthread_create和pthread_join,并声明了一个pthread_t型的变量。

  pthread_t在头文件/usr/include/bits/pthreadtypes.h中定义:

  typedef unsigned long int pthread_t;

  它是一个线程的标识符。函数pthread_create用来创建一个线程,它的原型为:

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extern int pthread_create __P ((pthread_t *__thread, __const pthread_attr_t *__attr,void *(*__start_routine) (void *), void *__arg));