Chris@16: //
Chris@16: // detail/impl/win_static_mutex.ipp
Chris@16: // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Chris@16: //
Chris@101: // Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com)
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: 
Chris@16: #ifndef BOOST_ASIO_DETAIL_IMPL_WIN_STATIC_MUTEX_IPP
Chris@16: #define BOOST_ASIO_DETAIL_IMPL_WIN_STATIC_MUTEX_IPP
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: # pragma once
Chris@16: #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: 
Chris@16: #include <boost/asio/detail/config.hpp>
Chris@16: 
Chris@16: #if defined(BOOST_ASIO_WINDOWS)
Chris@16: 
Chris@16: #include <cstdio>
Chris@16: #include <boost/asio/detail/throw_error.hpp>
Chris@16: #include <boost/asio/detail/win_static_mutex.hpp>
Chris@16: #include <boost/asio/error.hpp>
Chris@16: 
Chris@16: #include <boost/asio/detail/push_options.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace asio {
Chris@16: namespace detail {
Chris@16: 
Chris@16: void win_static_mutex::init()
Chris@16: {
Chris@16:   int error = do_init();
Chris@16:   boost::system::error_code ec(error,
Chris@16:       boost::asio::error::get_system_category());
Chris@16:   boost::asio::detail::throw_error(ec, "static_mutex");
Chris@16: }
Chris@16: 
Chris@16: int win_static_mutex::do_init()
Chris@16: {
Chris@16:   using namespace std; // For sprintf.
Chris@16:   wchar_t mutex_name[128];
Chris@16: #if defined(BOOST_ASIO_HAS_SECURE_RTL)
Chris@16:   swprintf_s(
Chris@16: #else // defined(BOOST_ASIO_HAS_SECURE_RTL)
Chris@16:   _snwprintf(
Chris@16: #endif // defined(BOOST_ASIO_HAS_SECURE_RTL)
Chris@16:       mutex_name, 128, L"asio-58CCDC44-6264-4842-90C2-F3C545CB8AA7-%u-%p",
Chris@16:       static_cast<unsigned int>(::GetCurrentProcessId()), this);
Chris@16: 
Chris@16:   HANDLE mutex = ::CreateMutexW(0, TRUE, mutex_name);
Chris@16:   DWORD last_error = ::GetLastError();
Chris@16:   if (mutex == 0)
Chris@16:     return ::GetLastError();
Chris@16: 
Chris@16:   if (last_error == ERROR_ALREADY_EXISTS)
Chris@16:     ::WaitForSingleObject(mutex, INFINITE);
Chris@16: 
Chris@16:   if (initialised_)
Chris@16:   {
Chris@16:     ::ReleaseMutex(mutex);
Chris@16:     ::CloseHandle(mutex);
Chris@16:     return 0;
Chris@16:   }
Chris@16: 
Chris@16: #if defined(__MINGW32__)
Chris@16:   // Not sure if MinGW supports structured exception handling, so for now
Chris@16:   // we'll just call the Windows API and hope.
Chris@16: # if defined(UNDER_CE)
Chris@16:   ::InitializeCriticalSection(&crit_section_);
Chris@16: # else
Chris@16:   if (!::InitializeCriticalSectionAndSpinCount(&crit_section_, 0x80000000))
Chris@16:   {
Chris@16:     last_error = ::GetLastError();
Chris@16:     ::ReleaseMutex(mutex);
Chris@16:     ::CloseHandle(mutex);
Chris@16:     return last_error;
Chris@16:   }
Chris@16: # endif
Chris@16: #else
Chris@16:   __try
Chris@16:   {
Chris@16: # if defined(UNDER_CE)
Chris@16:     ::InitializeCriticalSection(&crit_section_);
Chris@16: # else
Chris@16:     if (!::InitializeCriticalSectionAndSpinCount(&crit_section_, 0x80000000))
Chris@16:     {
Chris@16:       last_error = ::GetLastError();
Chris@16:       ::ReleaseMutex(mutex);
Chris@16:       ::CloseHandle(mutex);
Chris@16:       return last_error;
Chris@16:     }
Chris@16: # endif
Chris@16:   }
Chris@16:   __except(GetExceptionCode() == STATUS_NO_MEMORY
Chris@16:       ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
Chris@16:   {
Chris@16:     ::ReleaseMutex(mutex);
Chris@16:     ::CloseHandle(mutex);
Chris@16:     return ERROR_OUTOFMEMORY;
Chris@16:   }
Chris@16: #endif
Chris@16: 
Chris@16:   initialised_ = true;
Chris@16:   ::ReleaseMutex(mutex);
Chris@16:   ::CloseHandle(mutex);
Chris@16:   return 0;
Chris@16: }
Chris@16: 
Chris@16: } // namespace detail
Chris@16: } // namespace asio
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #include <boost/asio/detail/pop_options.hpp>
Chris@16: 
Chris@16: #endif // defined(BOOST_ASIO_WINDOWS)
Chris@16: 
Chris@16: #endif // BOOST_ASIO_DETAIL_IMPL_WIN_STATIC_MUTEX_IPP