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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2011-2012. 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/interprocess for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_INTERPROCESS_DETAIL_WINAPI_MUTEX_WRAPPER_HPP
#define BOOST_INTERPROCESS_DETAIL_WINAPI_MUTEX_WRAPPER_HPP
#if (defined _MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif
#include <boost/interprocess/detail/config_begin.hpp>
#include <boost/interprocess/detail/workaround.hpp>
#include <boost/interprocess/creation_tags.hpp>
#include <boost/interprocess/permissions.hpp>
#include <boost/interprocess/detail/win32_api.hpp>
#include <boost/interprocess/detail/posix_time_types_wrk.hpp>
#include <boost/interprocess/errors.hpp>
#include <boost/interprocess/exceptions.hpp>
#include <limits>
namespace boost {
namespace interprocess {
namespace ipcdetail {
class winapi_mutex_functions
{
/// @cond
//Non-copyable
winapi_mutex_functions(const winapi_mutex_functions &);
winapi_mutex_functions &operator=(const winapi_mutex_functions &);
/// @endcond
public:
winapi_mutex_functions(void *mtx_hnd)
: m_mtx_hnd(mtx_hnd)
{}
void unlock()
{
winapi::release_mutex(m_mtx_hnd);
}
void lock()
{
if(winapi::wait_for_single_object(m_mtx_hnd, winapi::infinite_time) != winapi::wait_object_0){
error_info err = system_error_code();
throw interprocess_exception(err);
}
}
bool try_lock()
{
unsigned long ret = winapi::wait_for_single_object(m_mtx_hnd, 0);
if(ret == winapi::wait_object_0){
return true;
}
else if(ret == winapi::wait_timeout){
return false;
}
else{
error_info err = system_error_code();
throw interprocess_exception(err);
}
}
bool timed_lock(const boost::posix_time::ptime &abs_time)
{
if(abs_time == boost::posix_time::pos_infin){
this->lock();
return true;
}
unsigned long ret = winapi::wait_for_single_object
(m_mtx_hnd, (abs_time - microsec_clock::universal_time()).total_milliseconds());
if(ret == winapi::wait_object_0){
return true;
}
else if(ret == winapi::wait_timeout){
return false;
}
else{
error_info err = system_error_code();
throw interprocess_exception(err);
}
}
/// @cond
protected:
void *m_mtx_hnd;
/// @endcond
};
//Swappable mutex wrapper
class winapi_mutex_wrapper
: public winapi_mutex_functions
{
/// @cond
//Non-copyable
winapi_mutex_wrapper(const winapi_mutex_wrapper &);
winapi_mutex_wrapper &operator=(const winapi_mutex_wrapper &);
/// @endcond
public:
winapi_mutex_wrapper(void *mtx_hnd = winapi::invalid_handle_value)
: winapi_mutex_functions(mtx_hnd)
{}
~winapi_mutex_wrapper()
{ this->close(); }
void *release()
{
void *hnd = m_mtx_hnd;
m_mtx_hnd = winapi::invalid_handle_value;
return hnd;
}
void *handle() const
{ return m_mtx_hnd; }
bool open_or_create(const char *name, const permissions &perm)
{
if(m_mtx_hnd == winapi::invalid_handle_value){
m_mtx_hnd = winapi::open_or_create_mutex
( name
, false
, (winapi::interprocess_security_attributes*)perm.get_permissions()
);
return m_mtx_hnd != winapi::invalid_handle_value;
}
else{
return false;
}
}
void close()
{
if(m_mtx_hnd != winapi::invalid_handle_value){
winapi::close_handle(m_mtx_hnd);
m_mtx_hnd = winapi::invalid_handle_value;
}
}
void swap(winapi_mutex_wrapper &other)
{ void *tmp = m_mtx_hnd; m_mtx_hnd = other.m_mtx_hnd; other.m_mtx_hnd = tmp; }
};
} //namespace ipcdetail {
} //namespace interprocess {
} //namespace boost {
#include <boost/interprocess/detail/config_end.hpp>
#endif //BOOST_INTERPROCESS_DETAIL_WINAPI_MUTEX_WRAPPER_HPP
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