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dll.c
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dll.c
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/*
* dll.c
*
* Description:
* This translation unit implements DLL initialisation.
* This translation unit implements static auto-init and auto-exit logic.
*
* --------------------------------------------------------------------------
*
* pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999-2021 pthreads-win32 / pthreads4w contributors
*
* Homepage1: http://sourceware.org/pthreads-win32/
* Homepage2: http://sourceforge.net/projects/pthreads4w/
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
* --------------------------------------------------------------------------
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#if defined(PTW32_STATIC_LIB) && defined(_MSC_VER) && _MSC_VER >= 1400 && defined(_WINDLL)
# undef PTW32_STATIC_LIB
# define PTW32_STATIC_TLSLIB
#endif
/* [i_a] sanity build checks */
#if defined(_MSC_VER) && (defined(_WIN32) || defined(_WIN64))
#if !defined(PTW32_STATIC_LIB) && !defined(_WINDLL)
#error "Should not compile dynamic library code when apparently trying to build a static lib"
#elif defined(PTW32_STATIC_LIB) && defined(_WINDLL)
#error "Should not compile static library code when apparently trying to build a dynamic lib DLL"
#endif
#endif
#include "pthread.h"
#include "implement.h"
#if !defined(PTW32_STATIC_LIB)
#if defined(_MSC_VER)
/*
* lpvReserved yields an unreferenced formal parameter;
* ignore it
*/
#pragma warning( disable : 4100 )
#endif
PTW32_BEGIN_C_DECLS
BOOL WINAPI DllMain (HINSTANCE hinstDll, DWORD fdwReason, LPVOID lpvReserved)
{
BOOL result = PTW32_TRUE;
switch (fdwReason)
{
case DLL_PROCESS_ATTACH:
result = pthread_win32_process_attach_np ();
break;
case DLL_THREAD_ATTACH:
/*
* A thread is being created
*/
result = pthread_win32_thread_attach_np ();
break;
case DLL_THREAD_DETACH:
/*
* A thread is exiting cleanly
*/
result = pthread_win32_thread_detach_np ();
break;
case DLL_PROCESS_DETACH:
(void) pthread_win32_thread_detach_np ();
result = pthread_win32_process_detach_np ();
break;
}
return (result);
} /* DllMain */
PTW32_END_C_DECLS
#endif /* !PTW32_STATIC_LIB */
#if ! defined(PTW32_BUILD_INLINED)
/*
* Avoid "translation unit is empty" warnings
*/
typedef int foo;
#endif
/* Visual Studio 8+ can leverage PIMAGE_TLS_CALLBACK CRT segments, which
* give a static lib its very own DllMain.
*/
#ifdef PTW32_STATIC_TLSLIB
static void WINAPI
TlsMain(PVOID h, DWORD r, PVOID u)
{
(void)DllMain((HINSTANCE)h, r, u);
}
#ifdef _M_X64
# pragma comment (linker, "/INCLUDE:_tls_used")
# pragma comment (linker, "/INCLUDE:_xl_b")
# pragma const_seg(".CRT$XLB")
EXTERN_C const PIMAGE_TLS_CALLBACK _xl_b = TlsMain;
# pragma const_seg()
#else
# pragma comment (linker, "/INCLUDE:__tls_used")
# pragma comment (linker, "/INCLUDE:__xl_b")
# pragma data_seg(".CRT$XLB")
EXTERN_C PIMAGE_TLS_CALLBACK _xl_b = TlsMain;
# pragma data_seg()
#endif /* _M_X64 */
#endif /* PTW32_STATIC_TLSLIB */
#if defined(PTW32_STATIC_LIB)
/*
* Note: MSVC 8 and higher use code in dll.c, which enables TLS cleanup
* on thread exit. Code here can only do process init and exit functions.
*/
#if defined(__MINGW32__) || defined(_MSC_VER)
/* For an explanation of this code (at least the MSVC parts), refer to
*
* http://www.codeguru.com/cpp/misc/misc/threadsprocesses/article.php/c6945/
* ("Running Code Before and After Main")
*
* Compatibility with MSVC8 was cribbed from Boost:
*
* http://svn.boost.org/svn/boost/trunk/libs/thread/src/win32/tss_pe.cpp
*
* In addition to that, because we are in a static library, and the linker
* can't tell that the constructor/destructor functions are actually
* needed, we need a way to prevent the linker from optimizing away this
* module. The pthread_win32_autostatic_anchor() hack below (and in
* implement.h) does the job in a portable manner.
*
* Make everything "extern" to evade being optimized away.
* Yes, "extern" is implied if not "static" but we are indicating we are
* doing this deliberately.
*/
extern int ptw32_on_process_init(void)
{
pthread_win32_process_attach_np ();
return 0;
}
extern int ptw32_on_process_exit(void)
{
pthread_win32_thread_detach_np ();
pthread_win32_process_detach_np ();
return 0;
}
#if defined(__GNUC__)
__attribute__((section(".ctors"), used)) extern int (*gcc_ctor)(void) = ptw32_on_process_init;
__attribute__((section(".dtors"), used)) extern int (*gcc_dtor)(void) = ptw32_on_process_exit;
#elif defined(_MSC_VER)
# if _MSC_VER >= 1400 /* MSVC8+ */
# pragma section(".CRT$XCU", long, read)
# pragma section(".CRT$XPU", long, read)
__declspec(allocate(".CRT$XCU")) extern int (*msc_ctor)(void) = ptw32_on_process_init;
__declspec(allocate(".CRT$XPU")) extern int (*msc_dtor)(void) = ptw32_on_process_exit;
# else
# pragma data_seg(".CRT$XCU")
extern int (*msc_ctor)(void) = ptw32_on_process_init;
# pragma data_seg(".CRT$XPU")
extern int (*msc_dtor)(void) = ptw32_on_process_exit;
# pragma data_seg() /* reset data segment */
# endif
#endif
#endif /* defined(__MINGW32__) || defined(_MSC_VER) */
PTW32_BEGIN_C_DECLS
#if defined (PTW32_STATIC_LIB) && defined (PTW32_BUILD) && !defined (PTW32_TEST_SNEAK_PEEK)
/* This dummy function exists solely to be referenced by other modules
* (specifically, in implement.h), so that the linker can't optimize away
* this module. Don't call it.
*
* Shouldn't work if we are compiling via pthreads.c
* (whole library single translation unit)
* Leaving it here in case it affects small-static builds.
*/
void ptw32_autostatic_anchor(void) { abort(); }
#endif
PTW32_END_C_DECLS
#endif /* PTW32_STATIC_LIB */