线程的入口和数据块有什么关系？

[lhx1054176946]

线程有什么数据是固定的？

[赵4老师]

《Windows核心编程》

[lm_whales]

有些库函数，有全局变量，多线程库这是全局变量，每个线程有自己的一份

[赵4老师]

仅供参考：C:\Program Files\Microsoft Visual Studio 10.0\VC\crt\src\rand.c

/***
*rand.c - random number generator
*
*       Copyright (c) Microsoft Corporation. All rights reserved.
*
*Purpose:
*       defines rand(), srand() - random number generator
*
*******************************************************************************/

#include <cruntime.h>
#include <mtdll.h>
#include <stddef.h>
#include <stdlib.h>

/***
*void srand(seed) - seed the random number generator
*
*Purpose:
*       Seeds the random number generator with the int given.  Adapted from the
*       BASIC random number generator.
*
*Entry:
*       unsigned seed - seed to seed rand # generator with
*
*Exit:
*       None.
*
*Exceptions:
*
*******************************************************************************/

void __cdecl srand (
        unsigned int seed
        )
{
        _getptd()->_holdrand = (unsigned long)seed;
}


/***
*int rand() - returns a random number
*
*Purpose:
*       returns a pseudo-random number 0 through 32767.
*
*Entry:
*       None.
*
*Exit:
*       Returns a pseudo-random number 0 through 32767.
*
*Exceptions:
*
*******************************************************************************/

int __cdecl rand (
        void
        )
{
        _ptiddata ptd = _getptd();

        return( ((ptd->_holdrand = ptd->_holdrand * 214013L
            + 2531011L) >> 16) & 0x7fff );
}