120 lines
3.6 KiB
C++
120 lines
3.6 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/interprocess for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_INTERPROCESS_DETAIL_WINDOWS_SEMAPHORE_HPP
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#define BOOST_INTERPROCESS_DETAIL_WINDOWS_SEMAPHORE_HPP
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#ifndef BOOST_CONFIG_HPP
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# include <boost/config.hpp>
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#endif
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#
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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#include <boost/interprocess/detail/config_begin.hpp>
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#include <boost/interprocess/detail/workaround.hpp>
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#include <boost/interprocess/detail/win32_api.hpp>
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#include <boost/interprocess/detail/windows_intermodule_singleton.hpp>
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#include <boost/interprocess/sync/windows/sync_utils.hpp>
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#include <boost/interprocess/sync/windows/winapi_semaphore_wrapper.hpp>
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#include <boost/interprocess/exceptions.hpp>
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#include <boost/assert.hpp>
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namespace boost {
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namespace interprocess {
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namespace ipcdetail {
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class winapi_semaphore
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{
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winapi_semaphore(const winapi_semaphore &);
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winapi_semaphore &operator=(const winapi_semaphore &);
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public:
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winapi_semaphore(unsigned int initialCount);
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~winapi_semaphore();
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void post(unsigned int release_count = 1);
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void wait();
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bool try_wait();
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template<class TimePoint> bool timed_wait(const TimePoint &abs_time);
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private:
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const sync_id id_;
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const unsigned initial_count_;
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};
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inline winapi_semaphore::winapi_semaphore(unsigned int initialCount)
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: id_(), initial_count_(initialCount)
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{
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sync_handles &handles =
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windows_intermodule_singleton<sync_handles>::get();
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//Force smeaphore creation with the initial count
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bool open_or_created;
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handles.obtain_semaphore(this->id_, this, initialCount, &open_or_created);
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//The semaphore must be created, never opened
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BOOST_ASSERT(open_or_created);
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BOOST_ASSERT(open_or_created && winapi::get_last_error() != winapi::error_already_exists);
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(void)open_or_created;
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}
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inline winapi_semaphore::~winapi_semaphore()
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{
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sync_handles &handles =
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windows_intermodule_singleton<sync_handles>::get();
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handles.destroy_handle(this->id_, this);
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}
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inline void winapi_semaphore::wait()
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{
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sync_handles &handles =
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windows_intermodule_singleton<sync_handles>::get();
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//This can throw
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winapi_semaphore_functions sem(handles.obtain_semaphore(this->id_, this, initial_count_));
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sem.wait();
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}
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inline bool winapi_semaphore::try_wait()
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{
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sync_handles &handles =
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windows_intermodule_singleton<sync_handles>::get();
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//This can throw
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winapi_semaphore_functions sem(handles.obtain_semaphore(this->id_, this, initial_count_));
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return sem.try_wait();
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}
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template<class TimePoint>
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inline bool winapi_semaphore::timed_wait(const TimePoint &abs_time)
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{
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sync_handles &handles =
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windows_intermodule_singleton<sync_handles>::get();
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//This can throw
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winapi_semaphore_functions sem(handles.obtain_semaphore(this->id_, this, initial_count_));
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return sem.timed_wait(abs_time);
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}
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inline void winapi_semaphore::post(unsigned release_count)
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{
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sync_handles &handles =
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windows_intermodule_singleton<sync_handles>::get();
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winapi_semaphore_functions sem(handles.obtain_semaphore(this->id_, this, initial_count_));
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sem.post(static_cast<long>(release_count));
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}
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} //namespace ipcdetail {
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} //namespace interprocess {
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} //namespace boost {
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#include <boost/interprocess/detail/config_end.hpp>
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#endif //BOOST_INTERPROCESS_DETAIL_WINDOWS_SEMAPHORE_HPP
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