C 线程行为不正确 - 简单代码

Question

我正在使用 _beginthreadex 在 c 中创建一个新线程。我已经编写了以下代码。 相同的代码用两个版本编写，第一个版本可以正常工作，但第二个版本不工作。

工作代码

main.c

#include <windows.h>
#include <stdio.h>

extern void func(unsigned (__stdcall *SecondThreadFunc)( void* ));

int main()
{ 
    func(NULL);
}

秒.c

#include<Windows.h>

//when thread start routine is declared in the same file new thread is running fine...
//but if this routine is moved to main.c and passed as parameter to func new thread is not working
unsigned __stdcall SecondThreadFunc( void* pArguments )
{
    printf( "In second thread...\n ");
    return 0;
} 


void func(unsigned (__stdcall *SecondThreadFunc)( void* ))
{
    HANDLE hThread;
    printf( "Creating second thread...\n" );

    // Create the second thread.
    hThread = (HANDLE)_beginthreadex( NULL, 0, &SecondThreadFunc, NULL, 0, NULL );

    // Wait until second thread terminates.
    WaitForSingleObject( hThread, INFINITE );
}

代码无效（如下）

main.c

#include <windows.h>
#include <stdio.h>
#include <process.h>


extern void func(unsigned (__stdcall *SecondThreadFunc)( void* ));

unsigned __stdcall SecondThreadFunc( void* pArguments )
{
    printf( "In second thread...\n ");
    return 0;
} 

int main()
{ 
    func(SecondThreadFunc);
}

秒.c

#include<Windows.h>

void func(unsigned (__stdcall *SecondThreadFunc)( void* ))
{
    HANDLE hThread;
    printf( "Creating second thread...\n" );

    // Create the second thread.
    hThread = (HANDLE)_beginthreadex( NULL, 0, &SecondThreadFunc, NULL, 0, NULL );

    // Wait until second thread terminates.
    WaitForSingleObject( hThread, INFINITE );
}

在调用 SecondThreadFunc 时，我在 _beginthreadex 中遇到访问冲突。有人能帮帮我吗。提前致谢。

Answer 1

在你应该有的无效代码中（注意 &s）：

hThread = (HANDLE)_beginthreadex( NULL, 0, SecondThreadFunc, NULL, 0, NULL );