/* Copyright 2006-2013 Joaquin M Lopez Munoz.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* See http://www.boost.org/libs/flyweight for library home page.
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*/
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#ifndef BOOST_FLYWEIGHT_DETAIL_RECURSIVE_LW_MUTEX_HPP
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#define BOOST_FLYWEIGHT_DETAIL_RECURSIVE_LW_MUTEX_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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/* Recursive lightweight mutex. Relies entirely on
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* boost::detail::lightweight_mutex, except in Pthreads, where we
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* explicitly use the PTHREAD_MUTEX_RECURSIVE attribute
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* (lightweight_mutex uses the default mutex type instead).
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*/
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#include <boost/config.hpp>
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#if !defined(BOOST_HAS_PTHREADS)
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#include <boost/detail/lightweight_mutex.hpp>
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namespace boost{
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namespace flyweights{
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namespace detail{
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typedef boost::detail::lightweight_mutex recursive_lightweight_mutex;
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} /* namespace flyweights::detail */
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} /* namespace flyweights */
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} /* namespace boost */
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#else
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/* code shamelessly ripped from <boost/detail/lwm_pthreads.hpp> */
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#include <boost/assert.hpp>
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#include <boost/noncopyable.hpp>
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#include <pthread.h>
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namespace boost{
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namespace flyweights{
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namespace detail{
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struct recursive_lightweight_mutex:noncopyable
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{
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recursive_lightweight_mutex()
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{
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pthread_mutexattr_t attr;
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BOOST_VERIFY(pthread_mutexattr_init(&attr)==0);
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BOOST_VERIFY(pthread_mutexattr_settype(&attr,PTHREAD_MUTEX_RECURSIVE)==0);
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BOOST_VERIFY(pthread_mutex_init(&m_,&attr)==0);
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BOOST_VERIFY(pthread_mutexattr_destroy(&attr)==0);
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}
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~recursive_lightweight_mutex(){pthread_mutex_destroy(&m_);}
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struct scoped_lock;
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friend struct scoped_lock;
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struct scoped_lock:noncopyable
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{
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public:
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scoped_lock(recursive_lightweight_mutex& m):m_(m.m_)
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{
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BOOST_VERIFY(pthread_mutex_lock(&m_)==0);
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}
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~scoped_lock(){BOOST_VERIFY(pthread_mutex_unlock(&m_)==0);}
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private:
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pthread_mutex_t& m_;
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};
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private:
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pthread_mutex_t m_;
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};
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} /* namespace flyweights::detail */
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} /* namespace flyweights */
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} /* namespace boost */
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#endif
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#endif
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