设置线程栈大小，不起作用，请教

zhongfangqing

//各位牛哥、牛姐、牛弟、牛妹：
//下面这坨代码，目的是想设置新线程的栈大小，但是不起作用。在下环境Red hat entriprise 6.2, 32位
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <pthread.h>
#include <limits.h>

typedef int BOOL;
#define TRUE 1
#define FALSE 0


void *ThOfCreateThread(void *pParam)
{
        pthread_attr_t attr;
        int nRet = pthread_attr_init(&attr);
        if(0 != nRet)
        {
                printf("!!ThOfCreateThread,1,pthread_attr_init fail,err=%d,%s\n", errno, strerror(errno));
                return NULL;
        }

        size_t tThStackSize = 0;
        nRet = ::pthread_attr_getstacksize(&attr, &tThStackSize);

        printf("ThOfCreateThread,4,pthread_attr_getstacksize,tThStackSize=%d\n", tThStackSize);

        nRet = pthread_attr_destroy(&attr);
        if(0 != nRet)
        {
                printf("!!ThOfCreateThread,7,pthread_attr_destroy fail,err=%d,%s\n", errno, strerror(errno));
        }

        return NULL;
}

void TestCreateThread()
{
        pthread_attr_t attr;
        struct sched_param param;

        pthread_t m_thread = 0;
        size_t m_dwStackSize = 1024 * 1024 * 2;
        int nRet = pthread_attr_init(&attr);
        if(0 != nRet)
        {
                printf("!!TestCreateThread,1,pthread_attr_init fail,err=%d,%s\n", errno, strerror(errno));
                return ;
        }
#if 0
        pthread_attr_setschedpolicy(&attr, nPolicy);
        pthread_attr_getschedparam(&attr, &param);
        param.__sched_priority = nPriority;
        pthread_attr_setschedparam(&attr, &param);
#endif

        //add by zfq,2013.09.17,begin
        if(0 != m_dwStackSize && 10240 < m_dwStackSize)
        {
                int nRet = 0;
                size_t tThStackSize = 0;

                nRet = ::pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);        //设置为非分离线程
                if( 0 != nRet)
                {
                        printf("!!TestCreateThread,2,setdetachstate fail,err=%d,%s\n", errno, strerror(errno));
                }

                nRet = ::pthread_attr_getstacksize(&attr, &tThStackSize);

                nRet = ::pthread_attr_setstacksize(&attr, m_dwStackSize);
                if( 0 != nRet)
                {
                        printf("!!TestCreateThread,3,setstacksize fail,err=%d,%s\n", errno, strerror(errno));
                }

                //======test,begin
#if 0
                size_t tThStackSize = 0;
                nRet = ::pthread_attr_getstacksize(&attr, &tThStackSize);
                if(0 != nRet)
                {
                        printf("!!TestCreateThread,4,pthread_attr_getstacksize fail,err=%d,%s\n", errno, strerror(errno));
                }

                printf("TestCreateThread,4,pthread_attr_getstacksize,tThStackSize=%d\n", tThStackSize);
#endif
                //======test,end
        }
        //add by zfq,2013.09.17,end

        BOOL BRet = FALSE;
        //        if (0 == pthread_create(&m_thread, NULL, fProc, pParam))        //del by zfq,2013.09.17
        if (0 == pthread_create(&m_thread, &attr, ThOfCreateThread, NULL))        //add by zfq,2013.09.17,加上属性
        {
                BRet = TRUE;
        }
        else
        {
                printf("!!TestCreateThread,5,pthread_create fail,err=%d,%s\n", errno, strerror(errno));
        }

        nRet = pthread_attr_destroy(&attr);
        if(0 != nRet)
        {
                printf("!!TestCreateThread,7,pthread_attr_destroy fail,err=%d,%s\n", errno, strerror(errno));
        }

        pthread_join(m_thread, NULL);
        return;
}

int main(int argc, char**argv)
{
   TestCreateThread();
   return 1;
}

myworkstation

回复 1# zhongfangqing


    stack size不能大于ulimit -s输的系统值（上限）,不能小于PTHREAD_STACK_MIN这个下限。

zhongfangqing

上限是8M，我设置的2M

井蛙夏虫

回复 1# zhongfangqing
按照apue中说的，使用线程栈属性应当要检查是否支持

1. Support for thread stack attributes is optional for a POSIX-conforming operating system, but is required if the system is to conform to the XSI. At compile time, you can check whether your system supports each thread stack attribute using the _POSIX_THREAD_ATTR_STACKADDR and _POSIX_THREAD_ATTR_STACKSIZE symbols. If one is defined, then the system supports the corresponding thread stack attribute. You can also check at runtime, by using the _SC_THREAD_ATTR_STACKADDR and _SC_THREAD_ATTR_STACKSIZE parameters to the sysconf function.

复制代码

zhongfangqing

回复 4# 井蛙夏虫


    谢谢回复！
    这两个宏确实没有被定义，但使用命令"ulimit -s 2048"这种方式可以修改为2M，但这种方式就比较死板了，不能针对线程级别进行设置