16、深入理解计算机系统之十： 并发编程（代码示例）

一、代码

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

/* define struct */
struct member
{
	int num;
	char *name;
};

/* 定义线程pthtead */
static void *pthread(void *arg)
{
	struct member *tmp;
	
	/* 线程开始运行 */
	printf("pthread start!\n");
	
	/* 令主线程继续执行 */
	sleep(2);
	
	/* 打印传入参数 */
	tmp = (struct member *)arg;
	printf("member->num: %d\n", tmp->num);
	printf("member->name: %s\n", tmp->name);
	
	return NULL;
}

int main(int argc, char **argv)
{
	pthread_t tid;
	struct member *b;
	
	if (argc != 2) {
		fprintf(stderr, "usage: %s <name>\n", argv[0]);
		exit(0);
	}
	
	/* 为结构体变量b赋值 */
	b = (struct member *)malloc(sizeof(struct member));
	b->num = 1;
	b->name = argv[1];
	
	/* 创建线程pthread */
	if ((pthread_create(&tid, NULL, pthread, (void *)b)) == -1)
	{
		printf("create error!\n");
		return 1;
	}
	
	/* 令线程pthread先运行 */
	sleep(1);
	
	/* 线程pthread睡眠2s,此时main可以先执行 */
	printf("main continue!\n");
	
	/* 等待线程pthread释放 */
	if (pthread_join(tid, NULL)) {
		printf("thread is not exit...\n");
		return -2;
	}
	
	return 0;
	
}
//

二、运行

三、分析

1、pthread_create(&tid, NULL, pthread, (void *)b)函数中的第四个参数是赋值给函数pthread的。