globals.cc Source File

00001 // Copyright (C) 2001 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 
00034 // On AIX, and perhaps other systems, library initialization order is
00035 // not guaranteed.  For example, the static initializers for the main
00036 // program might run before the static initializers for this library.
00037 // That means that we cannot rely on static initialization in the
00038 // library; there is no guarantee that things will get initialized in
00039 // time.  This file contains definitions of all global variables that
00040 // require initialization as arrays of characters.
00041 
00042 // Because <iostream> declares the standard streams to be [io]stream
00043 // types instead of say [io]fstream types, it is also necessary to
00044 // allocate the actual file buffers in this file.
00045 namespace std 
00046 {
00047   typedef char fake_istream[sizeof(istream)]
00048   __attribute__ ((aligned(__alignof__(istream))));
00049   typedef char fake_ostream[sizeof(ostream)] 
00050   __attribute__ ((aligned(__alignof__(ostream))));
00051   fake_istream cin;
00052   fake_ostream cout;
00053   fake_ostream cerr;
00054   fake_ostream clog;
00055 
00056   typedef char fake_filebuf[sizeof(filebuf)]
00057   __attribute__ ((aligned(__alignof__(filebuf))));
00058   fake_filebuf buf_cout;
00059   fake_filebuf buf_cin;
00060   fake_filebuf buf_cerr;
00061 
00062 #ifdef _GLIBCPP_USE_WCHAR_T
00063   typedef char fake_wistream[sizeof(wistream)] 
00064   __attribute__ ((aligned(__alignof__(wistream))));
00065   typedef char fake_wostream[sizeof(wostream)] 
00066   __attribute__ ((aligned(__alignof__(wostream))));
00067   fake_wistream wcin;
00068   fake_wostream wcout;
00069   fake_wostream wcerr;
00070   fake_wostream wclog;
00071 
00072   typedef char fake_wfilebuf[sizeof(wfilebuf)]
00073   __attribute__ ((aligned(__alignof__(wfilebuf))));
00074   fake_wfilebuf buf_wcout;
00075   fake_wfilebuf buf_wcin;
00076   fake_wfilebuf buf_wcerr;
00077 #endif
00078 
00079 // Globals for once-only runtime initialization of mutex objects.  This
00080 // allows static initialization of these objects on systems that need a
00081 // function call to initialize a mutex.  For example, see stl_threads.h.
00082 #if __GTHREADS
00083 #ifdef __GTHREAD_MUTEX_INIT
00084 // This path is not needed since static initialization of mutexs works
00085 // on this platform.
00086 #elif defined(__GTHREAD_MUTEX_INIT_FUNCTION)
00087 __gthread_once_t _GLIBCPP_once = __GTHREAD_ONCE_INIT;
00088 __gthread_mutex_t _GLIBCPP_mutex;
00089 __gthread_mutex_t *_GLIBCPP_mutex_address;
00090 
00091 // Once-only initializer function for _GLIBCPP_mutex.  
00092 void
00093 _GLIBCPP_mutex_init ()
00094 {
00095   __GTHREAD_MUTEX_INIT_FUNCTION (&_GLIBCPP_mutex);
00096 }
00097 // Once-only initializer function for _GLIBCPP_mutex_address.  
00098 void
00099 _GLIBCPP_mutex_address_init ()
00100 {
00101   __GTHREAD_MUTEX_INIT_FUNCTION (_GLIBCPP_mutex_address);
00102 }
00103 #endif
00104 #endif
00105 }