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File atomicity.h

// Support for atomic operations -*- C++ -*-

// Copyright (C) 2004-2018 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 3, 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.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file ext/atomicity.h
 *  This file is a GNU extension to the Standard C++ Library.
 */

#ifndef _GLIBCXX_ATOMICITY_H
#define _GLIBCXX_ATOMICITY_H	1

#pragma GCC system_header

#include <bits/c++config.h>
#include <bits/gthr.h>
#include <bits/atomic_word.h>

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

// Functions for portable atomic access.
  // To abstract locking primitives across all thread policies, use:
  // __exchange_and_add_dispatch
  // __atomic_add_dispatch
#ifdef _GLIBCXX_ATOMIC_BUILTINS
  static inline _Atomic_word 
  __exchange_and_add(volatile _Atomic_word* __mem, int __val)
  { return __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); }

static inline void
  __atomic_add(volatile _Atomic_word* __mem, int __val)
  { __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); }
#else
  _Atomic_word
  __attribute__ ((__unused__))
  __exchange_and_add(volatile _Atomic_word*, int) throw ();

void
  __attribute__ ((__unused__))
  __atomic_add(volatile _Atomic_word*, int) throw ();
#endif

static inline _Atomic_word
  __exchange_and_add_single(_Atomic_word* __mem, int __val)
  {
    _Atomic_word __result = *__mem;
    *__mem += __val;
    return __result;
  }

static inline void
  __atomic_add_single(_Atomic_word* __mem, int __val)
  { *__mem += __val; }

static inline _Atomic_word
  __attribute__ ((__unused__))
  __exchange_and_add_dispatch(_Atomic_word* __mem, int __val)
  {
#ifdef __GTHREADS
    if (__gthread_active_p())
      return __exchange_and_add(__mem, __val);
    else
      return __exchange_and_add_single(__mem, __val);
#else
    return __exchange_and_add_single(__mem, __val);
#endif
  }

static inline void
  __attribute__ ((__unused__))
  __atomic_add_dispatch(_Atomic_word* __mem, int __val)
  {
#ifdef __GTHREADS
    if (__gthread_active_p())
      __atomic_add(__mem, __val);
    else
      __atomic_add_single(__mem, __val);
#else
    __atomic_add_single(__mem, __val);
#endif
  }

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

// Even if the CPU doesn't need a memory barrier, we need to ensure
// that the compiler doesn't reorder memory accesses across the
// barriers.
#ifndef _GLIBCXX_READ_MEM_BARRIER
#define _GLIBCXX_READ_MEM_BARRIER __atomic_thread_fence (__ATOMIC_ACQUIRE)
#endif
#ifndef _GLIBCXX_WRITE_MEM_BARRIER
#define _GLIBCXX_WRITE_MEM_BARRIER __atomic_thread_fence (__ATOMIC_RELEASE)
#endif

#endif

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
..	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
pb_ds	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
algorithm	text/x-c	18.84 KB	-rw-r--r--	2025-08-26 09:45:00
aligned_buffer.h	text/plain	3.88 KB	-rw-r--r--	2025-08-26 09:45:00
alloc_traits.h	text/plain	5.57 KB	-rw-r--r--	2025-08-26 09:45:00
array_allocator.h	text/x-c	5.26 KB	-rw-r--r--	2025-08-26 09:45:00
atomicity.h	text/x-c	3.43 KB	-rw-r--r--	2025-08-26 09:45:00
bitmap_allocator.h	text/x-c	31.08 KB	-rw-r--r--	2025-08-26 09:45:00
cast.h	text/plain	4.34 KB	-rw-r--r--	2025-08-26 09:45:00
cmath	text/x-c	6.42 KB	-rw-r--r--	2025-08-26 09:45:00
codecvt_specializations.h	text/x-c	15.97 KB	-rw-r--r--	2025-08-26 09:45:00
concurrence.h	text/x-c	7.43 KB	-rw-r--r--	2025-08-26 09:45:00
debug_allocator.h	text/x-c	5.58 KB	-rw-r--r--	2025-08-26 09:45:00
enc_filebuf.h	text/x-c	2.19 KB	-rw-r--r--	2025-08-26 09:45:00
extptr_allocator.h	text/x-c	6.04 KB	-rw-r--r--	2025-08-26 09:45:00
functional	text/x-c	13.96 KB	-rw-r--r--	2025-08-26 09:45:00
hash_map	text/x-c	17.36 KB	-rw-r--r--	2025-08-26 09:45:01
hash_set	text/x-c	16.79 KB	-rw-r--r--	2025-08-26 09:45:01
iterator	text/x-c	3.94 KB	-rw-r--r--	2025-08-26 09:45:00
malloc_allocator.h	text/x-c	4.97 KB	-rw-r--r--	2025-08-26 09:45:00
memory	text/x-c	6.99 KB	-rw-r--r--	2025-08-26 09:45:00
mt_allocator.h	text/x-c	22.96 KB	-rw-r--r--	2025-08-26 09:45:00
new_allocator.h	text/x-c	4.69 KB	-rw-r--r--	2025-08-26 09:45:00
numeric	text/x-c	4.62 KB	-rw-r--r--	2025-08-26 09:45:00
numeric_traits.h	text/x-c	4.47 KB	-rw-r--r--	2025-08-26 09:45:00
pod_char_traits.h	text/x-c	5.43 KB	-rw-r--r--	2025-08-26 09:45:00
pointer.h	text/x-c	19.36 KB	-rw-r--r--	2025-08-26 09:45:00
pool_allocator.h	text/x-c	8.61 KB	-rw-r--r--	2025-08-26 09:45:00
random	text/x-c	108.78 KB	-rw-r--r--	2025-08-26 09:45:00
random.tcc	text/plain	58.83 KB	-rw-r--r--	2025-08-26 09:45:00
rb_tree	text/x-c	3.23 KB	-rw-r--r--	2025-08-26 09:45:00
rc_string_base.h	text/x-c	23.18 KB	-rw-r--r--	2025-08-26 09:45:01
rope	text/x-c	85.58 KB	-rw-r--r--	2025-08-26 09:45:00
ropeimpl.h	text/x-c	47.3 KB	-rw-r--r--	2025-08-26 09:45:00
slist	text/x-c	28.91 KB	-rw-r--r--	2025-08-26 09:45:00
sso_string_base.h	text/plain	15.93 KB	-rw-r--r--	2025-08-26 09:45:01
stdio_filebuf.h	text/x-c	5.54 KB	-rw-r--r--	2025-08-26 09:45:00
stdio_sync_filebuf.h	text/x-c	8.58 KB	-rw-r--r--	2025-08-26 09:45:00
string_conversions.h	text/x-c	3.51 KB	-rw-r--r--	2025-08-26 09:45:00
throw_allocator.h	text/x-c	23.96 KB	-rw-r--r--	2025-08-26 09:45:00
type_traits.h	text/x-c	5.78 KB	-rw-r--r--	2025-08-26 09:45:00
typelist.h	text/x-c	16.09 KB	-rw-r--r--	2025-08-26 09:45:00
vstring.h	text/x-c	107.98 KB	-rw-r--r--	2025-08-26 09:45:01
vstring.tcc	text/x-c	23.06 KB	-rw-r--r--	2025-08-26 09:45:01
vstring_fwd.h	text/x-c	3.15 KB	-rw-r--r--	2025-08-26 09:45:01
vstring_util.h	text/x-c	5.63 KB	-rw-r--r--	2025-08-26 09:45:01

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