Linux--线程 共享内存空间

线程_共享内存空间

//线程_共享内存空间

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

int g_data = 0;



void *func1(void *arg)
{
	printf("t1: %ld thread is create!\n",(unsigned long)pthread_self());
	printf("t1: param is %d \n",*((int *)arg));

	while(1){
		printf("t1: %d\n",g_data++);
		sleep(1);
	}
}

void *func2(void *arg)
{
	printf("t2: %ld thread is create!\n",(unsigned long)pthread_self());
	printf("t2: param is %d \n",*((int *)arg));
	
	while(1){
		printf("t2: %d\n",g_data++);
		sleep(1);
	}
}

int main()
{
	int ret;
	int param = 100;
	pthread_t t1;
	pthread_t t2;
	
	int *pret = NULL;
	
	//创建线程
	ret = pthread_create(&t1,NULL,func1,(void *)&param);//调用func1函数
	if(ret == 0){
		printf("main: create t1 success! \n");
	}
	
	ret = pthread_create(&t2,NULL,func2,(void *)&param);//调用func2函数
	if(ret == 0){
		printf("main: create t2 success! \n");
	}
	
	printf("main: %ld\n",(unsigned long)pthread_self());
	
	while(1){
		printf("main: %d\n",g_data++);
		sleep(1);
	}
	
	//等待
	pthread_join(t1,(void **)&pret);
	pthread_join(t2,(void **)&pret);
	
	return 0;
}

运行结果：

main:create t1 success ！
main:create t2 success ！
main 139811894569664 
main:0
t1:139811811059456 thread is create ！
t1:param is 100
t1:1
t2:139811802666752 thread is create ！
t2:param is 100
t2:2
main:3
t1:4
t2:5
t1:6
main:7

如果使 t1 = 3时退出，运行结果发现：有的时候能捕获到 t1 == 3，退出线程t1；有的时候捕获不到，t1无法退出。