native_client_sdk/src/libraries/third_party/pthreads-win32/autostatic.c

   1 /*
   2  * autostatic.c
   3  *
   4  * Description:
   5  * This translation unit implements static auto-init and auto-exit logic.
   6  *
   7  * --------------------------------------------------------------------------
   8  *
   9  *      Pthreads-win32 - POSIX Threads Library for Win32
  10  *      Copyright(C) 1998 John E. Bossom
  11  *      Copyright(C) 1999,2005 Pthreads-win32 contributors
  12  *
  13  *      Contact Email: rpj@callisto.canberra.edu.au
  14  *
  15  *      The current list of contributors is contained
  16  *      in the file CONTRIBUTORS included with the source
  17  *      code distribution. The list can also be seen at the
  18  *      following World Wide Web location:
  19  *      http://sources.redhat.com/pthreads-win32/contributors.html
  20  *
  21  *      This library is free software; you can redistribute it and/or
  22  *      modify it under the terms of the GNU Lesser General Public
  23  *      License as published by the Free Software Foundation; either
  24  *      version 2 of the License, or (at your option) any later version.
  25  *
  26  *      This library is distributed in the hope that it will be useful,
  27  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  28  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  29  *      Lesser General Public License for more details.
  30  *
  31  *      You should have received a copy of the GNU Lesser General Public
  32  *      License along with this library in the file COPYING.LIB;
  33  *      if not, write to the Free Software Foundation, Inc.,
  34  *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  35  */
  36
  37 #include "pthread.h"
  38 #include "implement.h"
  39
  40 #if defined(PTW32_STATIC_LIB)
  41
  42 #if defined(__MINGW64__) || defined(__MINGW32__) || defined(_MSC_VER)
  43
  44 /* For an explanation of this code (at least the MSVC parts), refer to
  45  *
  46  * http://www.codeguru.com/cpp/misc/misc/threadsprocesses/article.php/c6945/
  47  * ("Running Code Before and After Main")
  48  *
  49  * Compatibility with MSVC8 was cribbed from Boost:
  50  *
  51  * http://svn.boost.org/svn/boost/trunk/libs/thread/src/win32/tss_pe.cpp
  52  *
  53  * In addition to that, because we are in a static library, and the linker
  54  * can't tell that the constructor/destructor functions are actually
  55  * needed, we need a way to prevent the linker from optimizing away this
  56  * module. The pthread_win32_autostatic_anchor() hack below (and in
  57  * implement.h) does the job in a portable manner.
  58  */
  59
  60 static int on_process_init(void)
  61 {
  62     pthread_win32_process_attach_np ();
  63     return 0;
  64 }
  65
  66 static int on_process_exit(void)
  67 {
  68     pthread_win32_thread_detach_np  ();
  69     pthread_win32_process_detach_np ();
  70     return 0;
  71 }
  72
  73 #if defined(__MINGW64__) || defined(__MINGW32__)
  74 __attribute__((section(".ctors"), used)) static int (*gcc_ctor)(void) = on_process_init;
  75 __attribute__((section(".dtors"), used)) static int (*gcc_dtor)(void) = on_process_exit;
  76 #elif defined(_MSC_VER)
  77 #  if _MSC_VER >= 1400 /* MSVC8 */
  78 #    pragma section(".CRT$XCU", long, read)
  79 #    pragma section(".CRT$XPU", long, read)
  80 __declspec(allocate(".CRT$XCU")) static int (*msc_ctor)(void) = on_process_init;
  81 __declspec(allocate(".CRT$XPU")) static int (*msc_dtor)(void) = on_process_exit;
  82 #  else
  83 #    pragma data_seg(".CRT$XCU")
  84 static int (*msc_ctor)(void) = on_process_init;
  85 #    pragma data_seg(".CRT$XPU")
  86 static int (*msc_dtor)(void) = on_process_exit;
  87 #    pragma data_seg() /* reset data segment */
  88 #  endif
  89 #endif
  90
  91 #endif /* defined(__MINGW64__) || defined(__MINGW32__) || defined(_MSC_VER) */
  92
  93 /* This dummy function exists solely to be referenced by other modules
  94  * (specifically, in implement.h), so that the linker can't optimize away
  95  * this module. Don't call it.
  96  */
  97 void ptw32_autostatic_anchor(void) { abort(); }
  98
  99 #endif /* PTW32_STATIC_LIB */
 100
 101 #if ! defined(PTW32_BUILD_INLINED)
 102 /*
 103  * Avoid "translation unit is empty" warnings
 104  */
 105 typedef int foo;
 106 #endif