我编写了一个小程序来创建线程并更改它们的默认堆栈大小，但在我的情况下。当我在更改属性后打印堆栈大小时，我仍然将堆栈大小显示为默认堆栈大小。
# include<iostream>
# include<pthread.h>
# include<stdio.h>
# define size 10
using namespace std;
pthread_attr_t attr;
void* sum(void * threadid)
{
static int sum =0;
sum=sum+5;
long id=(long)threadid;
size_t mystacksize;
pthread_attr_getstacksize(&attr,&mystacksize);
cout << " stack size "<< mystacksize <<endl;
}
int main()
{
int rc;
long t=0;
pthread_t threads[5]; //number of different thread to br creatd
size_t stacksize;
pthread_attr_init(&attr);
pthread_attr_getstacksize(&attr,&stacksize); //gets the default stack size
//allocated for thread
cout <<" Default stack size is : " << stacksize <<endl;
stacksize=size;
pthread_attr_setstacksize(&attr,stacksize); //sets a new stacksize for thread
for(t=0;t<5;t++)
{
rc=pthread_create(&threads[t],&attr,sum,(void*)t);
if(rc)
cout << "thread creation failed with id : " << t <<endl;
}
pthread_exit(NULL);
return 0;
}
输出是： -
Default stack size is : 8388608
stack size : 8388608
stack size : 8388608
stack size : 8388608
stack size : 8388608
stack size : 8388608
另请注意，如果我尝试增加stacksize比default size我成功的能力更大的值。