throwing exception from APCProc crashes program
- by lazy_banana
I started to do some research on how terminate a multithreaded application properly and I found those 2 post(first, second) about how to use QueueUserAPC to signal other threads to terminate.
I thought I should give it a try, and the application keeps crashing when I throw the exception from the APCProc.
Code:
#include <stdio.h>
#include <windows.h>
class ExitException
{
public:
char *desc;
DWORD exit_code;
ExitException(char *desc,int exit_code): desc(desc), exit_code(exit_code)
{}
};
//I use this class to check if objects are deconstructed upon termination
class Test
{
public:
char *s;
Test(char *s): s(s)
{
printf("%s ctor\n",s);
}
~Test()
{
printf("%s dctor\n",s);
}
};
DWORD CALLBACK ThreadProc(void *useless)
{
try
{
Test t("thread_test");
SleepEx(INFINITE,true);
return 0;
}
catch (ExitException &e)
{
printf("Thread exits\n%s %lu",e.desc,e.exit_code);
return e.exit_code;
}
}
void CALLBACK exit_apc_proc(ULONG_PTR param)
{
puts("In APCProc");
ExitException e("Application exit signal!",1);
throw e;
return;
}
int main()
{
HANDLE thread=CreateThread(NULL,0,ThreadProc,NULL,0,NULL);
Sleep(1000);
QueueUserAPC(exit_apc_proc,thread,0);
WaitForSingleObject(thread,INFINITE);
puts("main: bye");
return 0;
}
My question is why does this happen?
I use mingw for compilation and my OS is 64bit.
Can this be the reason?I read that you shouldn't call QueueApcProc from a 32bit app for a thread which runs in a 64bit process or vice versa, but this shouldn't be the case.
