boost/flyweight/detail/recursive_lw_mutex.hpp
/* Copyright 2006-2023 Joaquin M Lopez Munoz.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*
* See http://www.boost.org/libs/flyweight for library home page.
*/
#ifndef BOOST_FLYWEIGHT_DETAIL_RECURSIVE_LW_MUTEX_HPP
#define BOOST_FLYWEIGHT_DETAIL_RECURSIVE_LW_MUTEX_HPP
#if defined(_MSC_VER)
#pragma once
#endif
/* Recursive lightweight mutex.
* - If <mutex> is provided, it uses std::recursive_mutex.
* - Else if Pthreads is available, it uses a Pthreads mutex with
* PTHREAD_MUTEX_RECURSIVE attribute.
* - Else if on Windows/Cygwin, it relies on boost::detail::lightweight_mutex
* for an implementation based on (recursive) Win32 CRITICAL_SECTION.
* - Else, it provides a dummy implementation.
*/
#include <boost/config.hpp>
#if !defined(BOOST_NO_CXX11_HDR_MUTEX)
#include <boost/noncopyable.hpp>
#include <mutex>
namespace boost{
namespace flyweights{
namespace detail{
struct recursive_lightweight_mutex:noncopyable
{
recursive_lightweight_mutex(){}
struct scoped_lock;
friend struct scoped_lock;
struct scoped_lock:noncopyable
{
public:
scoped_lock(recursive_lightweight_mutex& m):m_(m.m_){m_.lock();}
~scoped_lock(){m_.unlock();}
private:
std::recursive_mutex& m_;
};
private:
std::recursive_mutex m_;
};
} /* namespace flyweights::detail */
} /* namespace flyweights */
} /* namespace boost */
#elif defined(BOOST_HAS_PTHREADS)
/* code shamelessly ripped from <boost/detail/lwm_pthreads.hpp> */
#include <boost/assert.hpp>
#include <boost/noncopyable.hpp>
#include <pthread.h>
namespace boost{
namespace flyweights{
namespace detail{
struct recursive_lightweight_mutex:noncopyable
{
recursive_lightweight_mutex()
{
pthread_mutexattr_t attr;
BOOST_VERIFY(pthread_mutexattr_init(&attr)==0);
BOOST_VERIFY(pthread_mutexattr_settype(&attr,PTHREAD_MUTEX_RECURSIVE)==0);
BOOST_VERIFY(pthread_mutex_init(&m_,&attr)==0);
BOOST_VERIFY(pthread_mutexattr_destroy(&attr)==0);
}
~recursive_lightweight_mutex(){pthread_mutex_destroy(&m_);}
struct scoped_lock;
friend struct scoped_lock;
struct scoped_lock:noncopyable
{
public:
scoped_lock(recursive_lightweight_mutex& m):m_(m.m_)
{
BOOST_VERIFY(pthread_mutex_lock(&m_)==0);
}
~scoped_lock(){BOOST_VERIFY(pthread_mutex_unlock(&m_)==0);}
private:
pthread_mutex_t& m_;
};
private:
pthread_mutex_t m_;
};
} /* namespace flyweights::detail */
} /* namespace flyweights */
} /* namespace boost */
#elif defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
#include <boost/smart_ptr/detail/lightweight_mutex.hpp>
namespace boost{
namespace flyweights{
namespace detail{
typedef boost::detail::lightweight_mutex recursive_lightweight_mutex;
} /* namespace flyweights::detail */
} /* namespace flyweights */
} /* namespace boost */
#else
namespace boost{
namespace flyweights{
namespace detail{
struct recursive_lightweight_mutex
{
typedef recursive_lightweight_mutex scoped_lock;
};
} /* namespace flyweights::detail */
} /* namespace flyweights */
} /* namespace boost */
#endif
#endif