globals_io.cc

00001 // Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc. 00002 // 00003 // This file is part of the GNU ISO C++ Library. This library is free 00004 // software; you can redistribute it and/or modify it under the 00005 // terms of the GNU General Public License as published by the 00006 // Free Software Foundation; either version 2, or (at your option) 00007 // any later version. 00008 00009 // This library is distributed in the hope that it will be useful, 00010 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00012 // GNU General Public License for more details. 00013 00014 // You should have received a copy of the GNU General Public License along 00015 // with this library; see the file COPYING. If not, write to the Free 00016 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 00017 // USA. 00018 00019 // As a special exception, you may use this file as part of a free software 00020 // library without restriction. Specifically, if other files instantiate 00021 // templates or use macros or inline functions from this file, or you compile 00022 // this file and link it with other files to produce an executable, this 00023 // file does not by itself cause the resulting executable to be covered by 00024 // the GNU General Public License. This exception does not however 00025 // invalidate any other reasons why the executable file might be covered by 00026 // the GNU General Public License. 00027 00028 #include "bits/c++config.h" 00029 #include "bits/gthr.h" 00030 #include <fstream> 00031 #include <istream> 00032 #include <ostream> 00033 #include <ext/stdio_filebuf.h> 00034 #include <ext/stdio_sync_filebuf.h> 00035 00036 // On AIX, and perhaps other systems, library initialization order is 00037 // not guaranteed. For example, the static initializers for the main 00038 // program might run before the static initializers for this library. 00039 // That means that we cannot rely on static initialization in the 00040 // library; there is no guarantee that things will get initialized in 00041 // time. This file contains definitions of all global variables that 00042 // require initialization as arrays of characters. 00043 00044 // NB: asm directives can rename these non-exported, namespace 00045 // __gnu_cxx symbols into exported, namespace std symbols with the 00046 // appropriate symbol version name. 00047 // The rename syntax is 00048 // asm (".symver currentname,oldname@@GLIBCXX_3.2") 00049 // In macro form: 00050 // _GLIBCXX_ASM_SYMVER(currentname, oldname, GLIBCXX_3.2) 00051 00052 namespace std 00053 { 00054 // Standard stream objects. 00055 // NB: Iff <iostream> is included, these definitions become wonky. 00056 typedef char fake_istream[sizeof(istream)] 00057 __attribute__ ((aligned(__alignof__(istream)))); 00058 typedef char fake_ostream[sizeof(ostream)] 00059 __attribute__ ((aligned(__alignof__(ostream)))); 00060 fake_istream cin; 00061 fake_ostream cout; 00062 fake_ostream cerr; 00063 fake_ostream clog; 00064 00065 #ifdef _GLIBCXX_USE_WCHAR_T 00066 typedef char fake_wistream[sizeof(wistream)] 00067 __attribute__ ((aligned(__alignof__(wistream)))); 00068 typedef char fake_wostream[sizeof(wostream)] 00069 __attribute__ ((aligned(__alignof__(wostream)))); 00070 fake_wistream wcin; 00071 fake_wostream wcout; 00072 fake_wostream wcerr; 00073 fake_wostream wclog; 00074 #endif 00075 } // namespace std 00076 00077 namespace __gnu_internal 00078 { 00079 using namespace std; 00080 using namespace __gnu_cxx; 00081 00082 // We use different stream buffer types depending on whether 00083 // ios_base::sync_with_stdio(false) has been called. 00084 typedef char fake_stdiobuf[sizeof(stdio_sync_filebuf<char>)] 00085 __attribute__ ((aligned(__alignof__(stdio_sync_filebuf<char>)))); 00086 fake_stdiobuf buf_cout_sync; 00087 fake_stdiobuf buf_cin_sync; 00088 fake_stdiobuf buf_cerr_sync; 00089 00090 typedef char fake_filebuf[sizeof(stdio_filebuf<char>)] 00091 __attribute__ ((aligned(__alignof__(stdio_filebuf<char>)))); 00092 fake_filebuf buf_cout; 00093 fake_filebuf buf_cin; 00094 fake_filebuf buf_cerr; 00095 00096 #ifdef _GLIBCXX_USE_WCHAR_T 00097 typedef char fake_wstdiobuf[sizeof(stdio_sync_filebuf<wchar_t>)] 00098 __attribute__ ((aligned(__alignof__(stdio_sync_filebuf<wchar_t>)))); 00099 fake_wstdiobuf buf_wcout_sync; 00100 fake_wstdiobuf buf_wcin_sync; 00101 fake_wstdiobuf buf_wcerr_sync; 00102 00103 typedef char fake_wfilebuf[sizeof(stdio_filebuf<wchar_t>)] 00104 __attribute__ ((aligned(__alignof__(stdio_filebuf<wchar_t>)))); 00105 fake_wfilebuf buf_wcout; 00106 fake_wfilebuf buf_wcin; 00107 fake_wfilebuf buf_wcerr; 00108 #endif 00109 00110 // Globals for once-only runtime initialization of mutex objects. This 00111 // allows static initialization of these objects on systems that need a 00112 // function call to initialize a mutex. For example, see stl_threads.h. 00113 #ifdef __GTHREAD_MUTEX_INIT 00114 #elif defined(__GTHREAD_MUTEX_INIT_FUNCTION) 00115 __gthread_once_t _GLIBCXX_once = __GTHREAD_ONCE_INIT; 00116 __gthread_mutex_t _GLIBCXX_mutex; 00117 __gthread_mutex_t *_GLIBCXX_mutex_address; 00118 00119 // Once-only initializer function for _GLIBCXX_mutex. 00120 void 00121 _GLIBCXX_mutex_init () 00122 { __GTHREAD_MUTEX_INIT_FUNCTION (&_GLIBCXX_mutex); } 00123 00124 // Once-only initializer function for _GLIBCXX_mutex_address. 00125 void 00126 _GLIBCXX_mutex_address_init () 00127 { __GTHREAD_MUTEX_INIT_FUNCTION (_GLIBCXX_mutex_address); } 00128 #endif 00129 } // namespace __gnu_internal

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