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PATH: usr / include / c++ / 11 / ext

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

// Copyright (C) 2004-2021 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>
#if __has_include(<sys/single_threaded.h>)
# include <sys/single_threaded.h>
#endif

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

__attribute__((__always_inline__))
  inline bool
  __is_single_threaded() _GLIBCXX_NOTHROW
  {
#ifndef __GTHREADS
    return true;
#elif __has_include(<sys/single_threaded.h>)
    return ::__libc_single_threaded;
#else
    return !__gthread_active_p();
#endif
  }

// 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
  inline _Atomic_word
  __attribute__((__always_inline__))
  __exchange_and_add(volatile _Atomic_word* __mem, int __val)
  { return __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); }

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

void
  __atomic_add(volatile _Atomic_word*, int) _GLIBCXX_NOTHROW;
#endif

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

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

inline _Atomic_word
  __attribute__ ((__always_inline__))
  __exchange_and_add_dispatch(_Atomic_word* __mem, int __val)
  {
    if (__is_single_threaded())
      return __exchange_and_add_single(__mem, __val);
    else
      return __exchange_and_add(__mem, __val);
  }

inline void
  __attribute__ ((__always_inline__))
  __atomic_add_dispatch(_Atomic_word* __mem, int __val)
  {
    if (__is_single_threaded())
      __atomic_add_single(__mem, __val);
    else
      __atomic_add(__mem, __val);
  }

_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

[-] numeric [edit]
[-] random [edit]
[-] throw_allocator.h [edit]
[-] hash_map [edit]
[-] type_traits.h [edit]
[-] mt_allocator.h [edit]
[-] enc_filebuf.h [edit]
[-] random.tcc [edit]
[-] alloc_traits.h [edit]
[-] codecvt_specializations.h [edit]
[-] functional [edit]
[-] vstring.h [edit]
[-] memory [edit]
[-] rc_string_base.h [edit]
[-] rope [edit]
[+] pb_ds
[-] cmath [edit]
[-] aligned_buffer.h [edit]
[-] rb_tree [edit]
[-] ropeimpl.h [edit]
[-] numeric_traits.h [edit]
[-] hash_set [edit]
[-] bitmap_allocator.h [edit]
[-] sso_string_base.h [edit]
[-] pod_char_traits.h [edit]
[+] ..
[-] debug_allocator.h [edit]
[-] slist [edit]
[-] pool_allocator.h [edit]
[-] vstring_fwd.h [edit]
[-] algorithm [edit]
[-] pointer.h [edit]
[-] concurrence.h [edit]
[-] typelist.h [edit]
[-] vstring.tcc [edit]
[-] string_conversions.h [edit]
[-] cast.h [edit]
[-] iterator [edit]
[-] extptr_allocator.h [edit]
[-] vstring_util.h [edit]
[-] atomicity.h [edit]
[-] stdio_sync_filebuf.h [edit]
[-] malloc_allocator.h [edit]
[-] new_allocator.h [edit]
[-] stdio_filebuf.h [edit]