//////////////////////////////////////////////////////////////////////////////
 //
 // (C) Copyright Ion Gaztanaga 2005-2012. 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_WINDOWS_SEMAPHORE_HPP
 #define BOOST_INTERPROCESS_DETAIL_WINDOWS_SEMAPHORE_HPP
 
 #ifndef BOOST_CONFIG_HPP
 #  include <boost/config.hpp>
 #endif
 #
 #if defined(BOOST_HAS_PRAGMA_ONCE)
 #  pragma once
 #endif
 
 #include <boost/interprocess/detail/config_begin.hpp>
 #include <boost/interprocess/detail/workaround.hpp>
 #include <boost/interprocess/detail/posix_time_types_wrk.hpp>
 #include <boost/interprocess/detail/win32_api.hpp>
 #include <boost/interprocess/detail/windows_intermodule_singleton.hpp>
 #include <boost/interprocess/sync/windows/sync_utils.hpp>
 #include <boost/interprocess/sync/windows/winapi_semaphore_wrapper.hpp>
 #include <boost/interprocess/exceptions.hpp>
 #include <boost/assert.hpp>
 
 
 namespace boost {
 namespace interprocess {
 namespace ipcdetail {
 
 class winapi_semaphore
 {
    winapi_semaphore(const winapi_semaphore &);
    winapi_semaphore &operator=(const winapi_semaphore &);
    public:
 
    winapi_semaphore(unsigned int initialCount);
    ~winapi_semaphore();
 
    void post(unsigned int release_count = 1);
    void wait();
    bool try_wait();
    bool timed_wait(const boost::posix_time::ptime &abs_time);
 
    private:
    const sync_id id_;
    const unsigned initial_count_;
 };
 
 inline winapi_semaphore::winapi_semaphore(unsigned int initialCount)
    : id_(this), initial_count_(initialCount)
 {
    sync_handles &handles =
       windows_intermodule_singleton<sync_handles>::get();
    //Force smeaphore creation with the initial count
    bool open_or_created;
    handles.obtain_semaphore(this->id_, initialCount, &open_or_created);
    //The semaphore must be created, never opened
    BOOST_ASSERT(open_or_created);
    BOOST_ASSERT(open_or_created && winapi::get_last_error() != winapi::error_already_exists);
    (void)open_or_created;
 }
 
 inline winapi_semaphore::~winapi_semaphore()
 {
    sync_handles &handles =
       windows_intermodule_singleton<sync_handles>::get();
    handles.destroy_handle(this->id_);
 }
 
 inline void winapi_semaphore::wait()
 {
    sync_handles &handles =
       windows_intermodule_singleton<sync_handles>::get();
    //This can throw
    winapi_semaphore_functions sem(handles.obtain_semaphore(this->id_, initial_count_));
    sem.wait();
 }
 
 inline bool winapi_semaphore::try_wait()
 {
    sync_handles &handles =
       windows_intermodule_singleton<sync_handles>::get();
    //This can throw
    winapi_semaphore_functions sem(handles.obtain_semaphore(this->id_, initial_count_));
    return sem.try_wait();
 }
 
 inline bool winapi_semaphore::timed_wait(const boost::posix_time::ptime &abs_time)
 {
    sync_handles &handles =
       windows_intermodule_singleton<sync_handles>::get();
    //This can throw
    winapi_semaphore_functions sem(handles.obtain_semaphore(this->id_, initial_count_));
    return sem.timed_wait(abs_time);
 }
 
 inline void winapi_semaphore::post(unsigned release_count)
 {
    sync_handles &handles =
       windows_intermodule_singleton<sync_handles>::get();
    winapi_semaphore_functions sem(handles.obtain_semaphore(this->id_, initial_count_));
    sem.post(release_count);
 }
 
 
 }  //namespace ipcdetail {
 }  //namespace interprocess {
 }  //namespace boost {
 
 #include <boost/interprocess/detail/config_end.hpp>
 
 #endif   //BOOST_INTERPROCESS_DETAIL_WINDOWS_SEMAPHORE_HPP