child.c

一个简单的LINUX多线程和MAKEFILE例子 在主线程里通过pthread_create函数创建2个线程

#include <stdlib.h>
#include <stdio.h>
#include <pthread.h>
void task1(int *counter);
void task2(int *counter);
void cleanup(int counter1, int counter2);

int g1 = 0;
int g2 = 0;
int pid = 0;
int main(void)
{
	pthread_t thrd1 ,thrd2;
	int ret;
	ret = pthread_create(&thrd1,NULL,(void *)task1,(void *)&g1);
	ret = pthread_create(&thrd1,NULL,(void *)task2,(void *)&g2);
	pthread_join(thrd2,NULL);
	pthread_join(thrd1,NULL);
	int status;
	
	waitpid(pid,&status,0);
	cleanup(g1,g2);
	exit(0);
}

void task1(int *counter)
{	//pid=getpid();
	//sleep(1);
	while(*counter<5)
	{
		printf("task1 ciount: %d\n",*counter);
		(*counter)++;
	//	printf("after plus, task1 ciount: %d\n",*counter);
	//	sleep(2);
	//	printf("after sleep, task1 ciount: %d\n", *counter);
	}
}
	
void task2(int *counter)
{
	while(*counter <5)
	{
		printf("task2 count: %d\n",*counter);
		(*counter)++;
	//sleep(1);	
	}
}
	
void cleanup(int counter1,int counter2)
{
	printf("toal iterations:%d\n",counter1+counter2);
}