testpthread1.c

linux c的多线程

/*http://www.pudn.com:7122/s.asp?kw=linux%20c%20多线程&pos=40
http://www.pudn.com/downloads30/sourcecode/database/detail97410.html
作者：ddxxkk
多线程设计 1
线程的调用
程序名为 testt.c
在编译时一定要有 -lpthread
cc -lpthread -o testt testt.c
*/

#include <pthread.h>
#include <stdio.h>
void *testn(void *arg)  //线程1
{
int n=1,nnn,*inn=(int *)arg;
pthread_t id;
id=pthread_self();
printf(" Pthread is create id=%d \n",id);
for (n=1;n<4 ;n++)
 {
  printf(" id%d  and *arg=%d  n=%d \n",id,*inn,n);
   sleep(1); //停1秒钟
  }
printf(" Pthread is end id=%d \n",id);
*inn=*inn*11;
/*
pthread_exit(void *vp);
如果用返回值要用外部指针
*/
pthread_exit(inn);
//  pthread_exit(NULL);

}
void tests(void *arg)
{
    char *message;
	//pthread_detach(pthread id) 设计脱离进程，不可pthread_join
	printf("to detach %d \n",pthread_detach(pthread_self()));
    message = (char *) arg;
    printf("%s \n ", message);
}

int main()
{
	pthread_t threadid[4];
	int n0=100000,n1=200000,n2=30000,n3=40000;
	int *nb;
    char *mess1 = " This is dthread 1";
    char *mess2 = " This is dthread 2";
    nb=&n1;
	n1=99000;
	printf(" Begin \n");
/*  pthread_create( &a_thread, a_thread_attribute, (void *)&thread_function,(void *) &some_argument);
//	pthread_create(pthread_t *, const pthread_attr_t *, (void *) function, void *)'
//                 线程ID（不能为NULL)    线程类型         线程函数(不能为NULL)   参数
线程类型：PTHREAD_CREATE_DETACHED 脱离的
        PTHREAD_CREATE_JOINABLE  可汇合的(一般）
		SCHED_OTHER 非实时调度
		SCHED_FIFO 先进先出
		SCHED_RR 随机 
		一般用 NULL 默认值
*/
	pthread_create(&threadid[0],NULL,testn,(int *)&n0); 
	pthread_create(&threadid[1],NULL,testn,nb);

	pthread_create(&threadid[2],NULL,(void *)&tests,(void *)mess1);
	pthread_create(&threadid[3],NULL,(void *)&tests,(void *)mess2);

	printf(" end \n");
 //   sleep(10);
// 等线程结束 pthread_join(thread id)
//	pthread_join(threadid[1],NULL);
	printf(" now n0=%d \n",n0);
}