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gcc/libstdc++-v3/include/bits/ios_base.h
Andrew Pollard 17325050c2 ios_base.h: Use _Atomic_word for reference counts. 
libstdc++/5432
	* include/bits/ios_base.h: Use _Atomic_word for reference counts.
	* include/bits/localefwd.h: Likewise.
	Also use for std::locale:🆔:_S_highwater.
	* src/ios.cc (ios_base::xalloc): Use _Atomic_word.
	* src/locale.cc: Support new usage of _Atomic_word.
	(std::locale::classic): Guard entire function against reentry.
	* src/localename.cc: Support new usage of _Atomic_word.

From-SVN: r49195
2002-01-24 21:14:41 +00:00

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// Iostreams base classes -*- C++ -*-
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, 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 General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
//
// ISO C++ 14882: 27.8 File-based streams
//
/** @file ios_base.h
* This is an internal header file, included by other library headers.
* You should not attempt to use it directly.
*/
#ifndef _CPP_BITS_IOSBASE_H
#define _CPP_BITS_IOSBASE_H 1
#pragma GCC system_header
#include <bits/atomicity.h>
namespace std
{
// The following definitions of bitmask types are enums, not ints,
// as permitted (but not required) in the standard, in order to provide
// better type safety in iostream calls. A side effect is that
// expressions involving them are no longer compile-time constants.
enum _Ios_Fmtflags { _M_ios_fmtflags_end = 1L << 16 };
inline _Ios_Fmtflags
operator&(_Ios_Fmtflags __a, _Ios_Fmtflags __b)
{ return _Ios_Fmtflags(static_cast<int>(__a) & static_cast<int>(__b)); }
inline _Ios_Fmtflags
operator|(_Ios_Fmtflags __a, _Ios_Fmtflags __b)
{ return _Ios_Fmtflags(static_cast<int>(__a) | static_cast<int>(__b)); }
inline _Ios_Fmtflags
operator^(_Ios_Fmtflags __a, _Ios_Fmtflags __b)
{ return _Ios_Fmtflags(static_cast<int>(__a) ^ static_cast<int>(__b)); }
inline _Ios_Fmtflags
operator|=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b)
{ return __a = __a | __b; }
inline _Ios_Fmtflags
operator&=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b)
{ return __a = __a & __b; }
inline _Ios_Fmtflags
operator^=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b)
{ return __a = __a ^ __b; }
inline _Ios_Fmtflags
operator~(_Ios_Fmtflags __a)
{ return _Ios_Fmtflags(~static_cast<int>(__a)); }
enum _Ios_Openmode { _M_ios_openmode_end = 1L << 16 };
inline _Ios_Openmode
operator&(_Ios_Openmode __a, _Ios_Openmode __b)
{ return _Ios_Openmode(static_cast<int>(__a) & static_cast<int>(__b)); }
inline _Ios_Openmode
operator|(_Ios_Openmode __a, _Ios_Openmode __b)
{ return _Ios_Openmode(static_cast<int>(__a) | static_cast<int>(__b)); }
inline _Ios_Openmode
operator^(_Ios_Openmode __a, _Ios_Openmode __b)
{ return _Ios_Openmode(static_cast<int>(__a) ^ static_cast<int>(__b)); }
inline _Ios_Openmode
operator|=(_Ios_Openmode& __a, _Ios_Openmode __b)
{ return __a = __a | __b; }
inline _Ios_Openmode
operator&=(_Ios_Openmode& __a, _Ios_Openmode __b)
{ return __a = __a & __b; }
inline _Ios_Openmode
operator^=(_Ios_Openmode& __a, _Ios_Openmode __b)
{ return __a = __a ^ __b; }
inline _Ios_Openmode
operator~(_Ios_Openmode __a)
{ return _Ios_Openmode(~static_cast<int>(__a)); }
enum _Ios_Iostate { _M_ios_iostate_end = 1L << 16 };
inline _Ios_Iostate
operator&(_Ios_Iostate __a, _Ios_Iostate __b)
{ return _Ios_Iostate(static_cast<int>(__a) & static_cast<int>(__b)); }
inline _Ios_Iostate
operator|(_Ios_Iostate __a, _Ios_Iostate __b)
{ return _Ios_Iostate(static_cast<int>(__a) | static_cast<int>(__b)); }
inline _Ios_Iostate
operator^(_Ios_Iostate __a, _Ios_Iostate __b)
{ return _Ios_Iostate(static_cast<int>(__a) ^ static_cast<int>(__b)); }
inline _Ios_Iostate
operator|=(_Ios_Iostate& __a, _Ios_Iostate __b)
{ return __a = __a | __b; }
inline _Ios_Iostate
operator&=(_Ios_Iostate& __a, _Ios_Iostate __b)
{ return __a = __a & __b; }
inline _Ios_Iostate
operator^=(_Ios_Iostate& __a, _Ios_Iostate __b)
{ return __a = __a ^ __b; }
inline _Ios_Iostate
operator~(_Ios_Iostate __a)
{ return _Ios_Iostate(~static_cast<int>(__a)); }
enum _Ios_Seekdir { _M_ios_seekdir_end = 1L << 16 };
// 27.4.2 Class ios_base
class ios_base
{
public:
// 27.4.2.1.1 Class ios_base::failure
class failure : public exception
{
public:
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
//48. Use of non-existent exception constructor
explicit
failure(const string& __str) throw();
virtual
~failure() throw();
virtual const char*
what() const throw();
private:
enum { _M_bufsize = 256 };
char _M_name[_M_bufsize];
#endif
};
// 27.4.2.1.2 Type ios_base::fmtflags
typedef _Ios_Fmtflags fmtflags;
// 27.4.2.1.2 Type fmtflags
static const fmtflags boolalpha = fmtflags(__ios_flags::_S_boolalpha);
static const fmtflags dec = fmtflags(__ios_flags::_S_dec);
static const fmtflags fixed = fmtflags(__ios_flags::_S_fixed);
static const fmtflags hex = fmtflags(__ios_flags::_S_hex);
static const fmtflags internal = fmtflags(__ios_flags::_S_internal);
static const fmtflags left = fmtflags(__ios_flags::_S_left);
static const fmtflags oct = fmtflags(__ios_flags::_S_oct);
static const fmtflags right = fmtflags(__ios_flags::_S_right);
static const fmtflags scientific = fmtflags(__ios_flags::_S_scientific);
static const fmtflags showbase = fmtflags(__ios_flags::_S_showbase);
static const fmtflags showpoint = fmtflags(__ios_flags::_S_showpoint);
static const fmtflags showpos = fmtflags(__ios_flags::_S_showpos);
static const fmtflags skipws = fmtflags(__ios_flags::_S_skipws);
static const fmtflags unitbuf = fmtflags(__ios_flags::_S_unitbuf);
static const fmtflags uppercase = fmtflags(__ios_flags::_S_uppercase);
static const fmtflags adjustfield = fmtflags(__ios_flags::_S_adjustfield);
static const fmtflags basefield = fmtflags(__ios_flags::_S_basefield);
static const fmtflags floatfield = fmtflags(__ios_flags::_S_floatfield);
// 27.4.2.1.3 Type ios_base::iostate
typedef _Ios_Iostate iostate;
static const iostate badbit = iostate(__ios_flags::_S_badbit);
static const iostate eofbit = iostate(__ios_flags::_S_eofbit);
static const iostate failbit = iostate(__ios_flags::_S_failbit);
static const iostate goodbit = iostate(0);
// 27.4.2.1.4 Type openmode
typedef _Ios_Openmode openmode;
static const openmode app = openmode(__ios_flags::_S_app);
static const openmode ate = openmode(__ios_flags::_S_ate);
static const openmode binary = openmode(__ios_flags::_S_bin);
static const openmode in = openmode(__ios_flags::_S_in);
static const openmode out = openmode(__ios_flags::_S_out);
static const openmode trunc = openmode(__ios_flags::_S_trunc);
// 27.4.2.1.5 Type seekdir
typedef _Ios_Seekdir seekdir;
static const seekdir beg = seekdir(0);
static const seekdir cur = seekdir(SEEK_CUR);
static const seekdir end = seekdir(SEEK_END);
#ifdef _GLIBCPP_DEPRECATED
typedef int io_state;
typedef int open_mode;
typedef int seek_dir;
#endif
// Callbacks;
enum event
{
erase_event,
imbue_event,
copyfmt_event
};
typedef void (*event_callback) (event, ios_base&, int);
void
register_callback(event_callback __fn, int __index);
protected:
// Data Members
streamsize _M_precision;
streamsize _M_width;
fmtflags _M_flags;
// 27.4.2.6 Members for callbacks
// 27.4.2.6 ios_base callbacks
struct _Callback_list
{
// Data Members
_Callback_list* _M_next;
ios_base::event_callback _M_fn;
int _M_index;
_Atomic_word _M_refcount; // 0 means one reference.
_Callback_list(ios_base::event_callback __fn, int __index,
_Callback_list* __cb)
: _M_next(__cb), _M_fn(__fn), _M_index(__index), _M_refcount(0) { }
void
_M_add_reference() { __atomic_add(&_M_refcount, 1); }
int
_M_remove_reference() { return __exchange_and_add(&_M_refcount, -1); }
// 0 => OK to delete
};
_Callback_list* _M_callbacks;
void
_M_call_callbacks(event __ev) throw();
void
_M_dispose_callbacks(void);
// 27.4.2.5 Members for iword/pword storage
struct _Words
{
void* _M_pword;
long _M_iword;
};
static const int _S_local_words = 8;
_Words _M_word_array[_S_local_words]; // Guaranteed storage
_Words _M_dummy; // Only for failed iword/pword calls.
_Words* _M_words;
int _M_word_limit;
_Words&
_M_grow_words(int __index);
// Members for locale and locale caching.
locale _M_ios_locale;
void
_M_init();
public:
// 27.4.2.1.6 Class ios_base::Init
// Used to initialize standard streams. In theory, g++ could use
// -finit-priority to order this stuff correctly without going
// through these machinations.
class Init
{
friend class ios_base;
public:
Init();
~Init();
static void
_S_ios_create(bool __sync);
static void
_S_ios_destroy();
private:
static int _S_ios_base_init;
static bool _S_synced_with_stdio;
};
// Fmtflags state:
inline fmtflags
flags() const { return _M_flags; }
inline fmtflags
flags(fmtflags __fmtfl)
{
fmtflags __old = _M_flags;
_M_flags = __fmtfl;
return __old;
}
inline fmtflags
setf(fmtflags __fmtfl)
{
fmtflags __old = _M_flags;
_M_flags |= __fmtfl;
return __old;
}
inline fmtflags
setf(fmtflags __fmtfl, fmtflags __mask)
{
fmtflags __old = _M_flags;
_M_flags &= ~__mask;
_M_flags |= (__fmtfl & __mask);
return __old;
}
inline void
unsetf(fmtflags __mask) { _M_flags &= ~__mask; }
inline streamsize
precision() const { return _M_precision; }
inline streamsize
precision(streamsize __prec)
{
streamsize __old = _M_precision;
_M_precision = __prec;
return __old;
}
inline streamsize
width() const { return _M_width; }
inline streamsize
width(streamsize __wide)
{
streamsize __old = _M_width;
_M_width = __wide;
return __old;
}
static bool
sync_with_stdio(bool __sync = true);
// Locales:
locale
imbue(const locale& __loc);
inline locale
getloc() const { return _M_ios_locale; }
// Storage:
static int
xalloc() throw();
inline long&
iword(int __ix)
{
_Words& __word = (__ix < _M_word_limit)
? _M_words[__ix] : _M_grow_words(__ix);
return __word._M_iword;
}
inline void*&
pword(int __ix)
{
_Words& __word = (__ix < _M_word_limit)
? _M_words[__ix] : _M_grow_words(__ix);
return __word._M_pword;
}
// Destructor
~ios_base();
protected:
ios_base();
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
//50. Copy constructor and assignment operator of ios_base
private:
ios_base(const ios_base&);
ios_base&
operator=(const ios_base&);
#endif
};
// 27.4.5.1 fmtflags manipulators:
inline ios_base&
boolalpha(ios_base& __base)
{
__base.setf(ios_base::boolalpha);
return __base;
}
inline ios_base&
noboolalpha(ios_base& __base)
{
__base.unsetf(ios_base::boolalpha);
return __base;
}
inline ios_base&
showbase(ios_base& __base)
{
__base.setf(ios_base::showbase);
return __base;
}
inline ios_base&
noshowbase(ios_base& __base)
{
__base.unsetf(ios_base::showbase);
return __base;
}
inline ios_base&
showpoint(ios_base& __base)
{
__base.setf(ios_base::showpoint);
return __base;
}
inline ios_base&
noshowpoint(ios_base& __base)
{
__base.unsetf(ios_base::showpoint);
return __base;
}
inline ios_base&
showpos(ios_base& __base)
{
__base.setf(ios_base::showpos);
return __base;
}
inline ios_base&
noshowpos(ios_base& __base)
{
__base.unsetf(ios_base::showpos);
return __base;
}
inline ios_base&
skipws(ios_base& __base)
{
__base.setf(ios_base::skipws);
return __base;
}
inline ios_base&
noskipws(ios_base& __base)
{
__base.unsetf(ios_base::skipws);
return __base;
}
inline ios_base&
uppercase(ios_base& __base)
{
__base.setf(ios_base::uppercase);
return __base;
}
inline ios_base&
nouppercase(ios_base& __base)
{
__base.unsetf(ios_base::uppercase);
return __base;
}
inline ios_base&
unitbuf(ios_base& __base)
{
__base.setf(ios_base::unitbuf);
return __base;
}
inline ios_base&
nounitbuf(ios_base& __base)
{
__base.unsetf(ios_base::unitbuf);
return __base;
}
// 27.4.5.2 adjustfield anipulators:
inline ios_base&
internal(ios_base& __base)
{
__base.setf(ios_base::internal, ios_base::adjustfield);
return __base;
}
inline ios_base&
left(ios_base& __base)
{
__base.setf(ios_base::left, ios_base::adjustfield);
return __base;
}
inline ios_base&
right(ios_base& __base)
{
__base.setf(ios_base::right, ios_base::adjustfield);
return __base;
}
// 27.4.5.3 basefield anipulators:
inline ios_base&
dec(ios_base& __base)
{
__base.setf(ios_base::dec, ios_base::basefield);
return __base;
}
inline ios_base&
hex(ios_base& __base)
{
__base.setf(ios_base::hex, ios_base::basefield);
return __base;
}
inline ios_base&
oct(ios_base& __base)
{
__base.setf(ios_base::oct, ios_base::basefield);
return __base;
}
// 27.4.5.4 floatfield anipulators:
inline ios_base&
fixed(ios_base& __base)
{
__base.setf(ios_base::fixed, ios_base::floatfield);
return __base;
}
inline ios_base&
scientific(ios_base& __base)
{
__base.setf(ios_base::scientific, ios_base::floatfield);
return __base;
}
} // namespace std
#endif /* _CPP_BITS_IOSBASE_H */
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