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 (at) 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 107
