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//
// detail/impl/win_static_mutex.ipp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// 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)
//
#ifndef BOOST_ASIO_DETAIL_IMPL_WIN_STATIC_MUTEX_IPP
#define BOOST_ASIO_DETAIL_IMPL_WIN_STATIC_MUTEX_IPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#if defined(BOOST_ASIO_WINDOWS)
#include <cstdio>
#include <boost/asio/detail/throw_error.hpp>
#include <boost/asio/detail/win_static_mutex.hpp>
#include <boost/asio/error.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
void win_static_mutex::init()
{
int error = do_init();
boost::system::error_code ec(error,
boost::asio::error::get_system_category());
boost::asio::detail::throw_error(ec, "static_mutex");
}
int win_static_mutex::do_init()
{
using namespace std; // For sprintf.
wchar_t mutex_name[128];
#if defined(BOOST_ASIO_HAS_SECURE_RTL)
swprintf_s(
#else // defined(BOOST_ASIO_HAS_SECURE_RTL)
_snwprintf(
#endif // defined(BOOST_ASIO_HAS_SECURE_RTL)
mutex_name, 128, L"asio-58CCDC44-6264-4842-90C2-F3C545CB8AA7-%u-%p",
static_cast<unsigned int>(::GetCurrentProcessId()), this);
#if defined(BOOST_ASIO_WINDOWS_APP)
HANDLE mutex = ::CreateMutexExW(0, mutex_name, CREATE_MUTEX_INITIAL_OWNER, 0);
#else // defined(BOOST_ASIO_WINDOWS_APP)
HANDLE mutex = ::CreateMutexW(0, TRUE, mutex_name);
#endif // defined(BOOST_ASIO_WINDOWS_APP)
DWORD last_error = ::GetLastError();
if (mutex == 0)
return ::GetLastError();
if (last_error == ERROR_ALREADY_EXISTS)
{
#if defined(BOOST_ASIO_WINDOWS_APP)
::WaitForSingleObjectEx(mutex, INFINITE, false);
#else // defined(BOOST_ASIO_WINDOWS_APP)
::WaitForSingleObject(mutex, INFINITE);
#endif // defined(BOOST_ASIO_WINDOWS_APP)
}
if (initialised_)
{
::ReleaseMutex(mutex);
::CloseHandle(mutex);
return 0;
}
#if defined(__MINGW32__)
// Not sure if MinGW supports structured exception handling, so for now
// we'll just call the Windows API and hope.
# if defined(UNDER_CE)
::InitializeCriticalSection(&crit_section_);
# else
if (!::InitializeCriticalSectionAndSpinCount(&crit_section_, 0x80000000))
{
last_error = ::GetLastError();
::ReleaseMutex(mutex);
::CloseHandle(mutex);
return last_error;
}
# endif
#else
__try
{
# if defined(UNDER_CE)
::InitializeCriticalSection(&crit_section_);
# elif defined(BOOST_ASIO_WINDOWS_APP)
if (!::InitializeCriticalSectionEx(&crit_section_, 0, 0))
{
last_error = ::GetLastError();
::ReleaseMutex(mutex);
::CloseHandle(mutex);
return last_error;
}
# else
if (!::InitializeCriticalSectionAndSpinCount(&crit_section_, 0x80000000))
{
last_error = ::GetLastError();
::ReleaseMutex(mutex);
::CloseHandle(mutex);
return last_error;
}
# endif
}
__except(GetExceptionCode() == STATUS_NO_MEMORY
? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
{
::ReleaseMutex(mutex);
::CloseHandle(mutex);
return ERROR_OUTOFMEMORY;
}
#endif
initialised_ = true;
::ReleaseMutex(mutex);
::CloseHandle(mutex);
return 0;
}
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // defined(BOOST_ASIO_WINDOWS)
#endif // BOOST_ASIO_DETAIL_IMPL_WIN_STATIC_MUTEX_IPP
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