Linux线程共享内存空间是指多个线程可以访问同一个内存区域，这些线程共享该内存区域的内容。

代码：

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

// share memory


int data = 0; //定义一个全局变量data


void *fun1(void *arg)
{
	printf("t1:thread id is:%ld\n",(unsigned long)pthread_self());
	printf("t1:is param:%d\n",*((int *)arg));

	while(1){
		printf("线程t1拿到 data = %d\n",data++);
		sleep(1);
	}





}



void *fun2(void *arg)
{
	printf("t2:thread id is:%ld\n",(unsigned long)pthread_self());
	printf("t2:is param:%d\n",*((int *)arg));

	while(1){
		printf("线程t2拿到 data = %d\n",data++);
		sleep(1);
	}





}


int main()
{
	int ret;

	pthread_t t1;

	pthread_t t2;
	int param = 100;
	if(ret = pthread_create(&t1,NULL,fun1,(void *)&param) == 0){

		printf("main:creat t1 pthread successfully !\n");
	}


	if(ret = pthread_create(&t2,NULL,fun2,(void *)&param) == 0){

		printf("main:creat t2 pthread successfully !\n");
	}

	printf("main:获取主程序的ID:%ld\n",(unsigned long)pthread_self());

	while(1){

		printf("主进程main拿到 data = %d\n",data++);
		sleep(1);


	}
	pthread_join(t1,NULL);
	pthread_join(t2,NULL);

	return 0;

}

结果：

对全局变量进行操作，共享内存空间