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/*
* dll.c
*
* Description:
* This translation unit implements DLL initialisation.
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright (C) 1998
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA
*/
#include <malloc.h>
#include "pthread.h"
#include "implement.h"
/*
* Function pointer to TryEnterCriticalSection if it exists; otherwise NULL
*/
BOOL (WINAPI *_pthread_try_enter_critical_section)(LPCRITICAL_SECTION) = NULL;
/*
* We use this to double-check that TryEnterCriticalSection works.
*/
CRITICAL_SECTION cs;
/*
* Handle to kernel32.dll
*/
static HINSTANCE _pthread_h_kernel32;
#ifdef _MSC_VER
/*
* lpvReserved yields an unreferenced formal parameter;
* ignore it
*/
#pragma warning( disable : 4100 )
#endif
#ifdef __cplusplus
/*
* Dear c++: Please don't mangle this name. -thanks
*/
extern "C"
{
#endif /* __cplusplus */
BOOL WINAPI DllMain( HINSTANCE, DWORD, LPVOID);
#ifdef __cplusplus
}
#endif /* __cplusplus */
BOOL WINAPI
DllMain (
HINSTANCE hinstDll,
DWORD fdwReason,
LPVOID lpvReserved
)
{
BOOL result = TRUE;
switch (fdwReason)
{
case DLL_PROCESS_ATTACH:
/*
* The DLL is being mapped into the process's address space
*/
result = _pthread_processInitialize ();
/* Load KERNEL32 and try to get address of TryEnterCriticalSection */
_pthread_h_kernel32 = LoadLibrary(TEXT("KERNEL32.DLL"));
_pthread_try_enter_critical_section =
(BOOL (PT_STDCALL *)(LPCRITICAL_SECTION))
#if defined(NEED_UNICODE_CONSTS)
GetProcAddress(_pthread_h_kernel32,
(const TCHAR *)TEXT("TryEnterCriticalSection"));
#else
GetProcAddress(_pthread_h_kernel32,
(LPCSTR) "TryEnterCriticalSection");
#endif
if (_pthread_try_enter_critical_section != NULL)
{
InitializeCriticalSection(&cs);
if ((*_pthread_try_enter_critical_section)(&cs))
{
LeaveCriticalSection(&cs);
}
else
{
/*
* Not really supported (Win98?).
*/
_pthread_try_enter_critical_section = NULL;
}
DeleteCriticalSection(&cs);
}
if (_pthread_try_enter_critical_section == NULL)
{
/*
* If TryEnterCriticalSection is not being used, then free
* the kernel32.dll handle now, rather than leaving it until
* DLL_PROCESS_DETACH.
*
* Note: this is not a pedantic exercise in freeing unused
* resources! It is a work-around for a bug in Windows 95
* (see microsoft knowledge base article, Q187684) which
* does Bad Things when FreeLibrary is called within
* the DLL_PROCESS_DETACH code, in certain situations.
* Since w95 just happens to be a platform which does not
* provide TryEnterCriticalSection, the bug will be
* effortlessly avoided.
*/
(void) FreeLibrary(_pthread_h_kernel32);
_pthread_h_kernel32 = 0;
}
break;
case DLL_THREAD_ATTACH:
/*
* A thread is being created
*/
result = TRUE;
break;
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
/*
* A thread is exiting cleanly
* NOTE: The "main" thread detaches using
* DLL_PROCESS_DETACH
*/
{
pthread_t self;
if (_pthread_processInitialized)
{
self = (pthread_t) pthread_getspecific (_pthread_selfThreadKey);
/*
* Detached threads have their resources automatically
* cleaned up upon exit (others must be 'joined').
*/
if (self != NULL &&
self->detachState == PTHREAD_CREATE_DETACHED)
{
pthread_setspecific (_pthread_selfThreadKey, NULL);
_pthread_threadDestroy (self);
}
if (fdwReason == DLL_PROCESS_DETACH)
{
/*
* The DLL is being unmapped into the process's address space
*/
_pthread_processTerminate ();
if (_pthread_h_kernel32)
{
(void) FreeLibrary(_pthread_h_kernel32);
}
}
}
result = TRUE;
}
break;
}
return (result);
} /* DllMain */
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