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// Mutex pool used to limit contention -*- C++ -*-
// Copyright (C) 2016-2021 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
// 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
// <>.
namespace __gnu_internal _GLIBCXX_VISIBILITY(hidden)
const unsigned char mask = 0xf;
const unsigned char invalid = mask + 1;
/* Returns different instances of __mutex depending on the passed index
* in order to limit contention.
__gnu_cxx::__mutex& get_mutex(unsigned char i);