137 lines
3.4 KiB
C++
137 lines
3.4 KiB
C++
//
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// detail/impl/win_static_mutex.ipp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_IMPL_WIN_STATIC_MUTEX_IPP
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#define ASIO_DETAIL_IMPL_WIN_STATIC_MUTEX_IPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#if defined(ASIO_WINDOWS)
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#include <cstdio>
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#include "asio/detail/throw_error.hpp"
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#include "asio/detail/win_static_mutex.hpp"
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#include "asio/error.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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void win_static_mutex::init()
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{
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int error = do_init();
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asio::error_code ec(error,
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asio::error::get_system_category());
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asio::detail::throw_error(ec, "static_mutex");
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}
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int win_static_mutex::do_init()
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{
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using namespace std; // For sprintf.
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wchar_t mutex_name[128];
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#if defined(ASIO_HAS_SECURE_RTL)
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swprintf_s(
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#else // defined(ASIO_HAS_SECURE_RTL)
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_snwprintf(
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#endif // defined(ASIO_HAS_SECURE_RTL)
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mutex_name, 128, L"asio-58CCDC44-6264-4842-90C2-F3C545CB8AA7-%u-%p",
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static_cast<unsigned int>(::GetCurrentProcessId()), this);
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#if defined(ASIO_WINDOWS_APP)
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HANDLE mutex = ::CreateMutexExW(0, mutex_name, CREATE_MUTEX_INITIAL_OWNER, 0);
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#else // defined(ASIO_WINDOWS_APP)
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HANDLE mutex = ::CreateMutexW(0, TRUE, mutex_name);
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#endif // defined(ASIO_WINDOWS_APP)
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DWORD last_error = ::GetLastError();
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if (mutex == 0)
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return ::GetLastError();
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if (last_error == ERROR_ALREADY_EXISTS)
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{
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#if defined(ASIO_WINDOWS_APP)
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::WaitForSingleObjectEx(mutex, INFINITE, false);
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#else // defined(ASIO_WINDOWS_APP)
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::WaitForSingleObject(mutex, INFINITE);
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#endif // defined(ASIO_WINDOWS_APP)
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}
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if (initialised_)
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{
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::ReleaseMutex(mutex);
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::CloseHandle(mutex);
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return 0;
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}
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#if defined(__MINGW32__)
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// Not sure if MinGW supports structured exception handling, so for now
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// we'll just call the Windows API and hope.
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# if defined(UNDER_CE)
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::InitializeCriticalSection(&crit_section_);
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# else
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if (!::InitializeCriticalSectionAndSpinCount(&crit_section_, 0x80000000))
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{
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last_error = ::GetLastError();
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::ReleaseMutex(mutex);
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::CloseHandle(mutex);
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return last_error;
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}
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# endif
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#else
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__try
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{
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# if defined(UNDER_CE)
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::InitializeCriticalSection(&crit_section_);
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# elif defined(ASIO_WINDOWS_APP)
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if (!::InitializeCriticalSectionEx(&crit_section_, 0, 0))
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{
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last_error = ::GetLastError();
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::ReleaseMutex(mutex);
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::CloseHandle(mutex);
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return last_error;
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}
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# else
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if (!::InitializeCriticalSectionAndSpinCount(&crit_section_, 0x80000000))
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{
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last_error = ::GetLastError();
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::ReleaseMutex(mutex);
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::CloseHandle(mutex);
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return last_error;
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}
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# endif
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}
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__except(GetExceptionCode() == STATUS_NO_MEMORY
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? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
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{
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::ReleaseMutex(mutex);
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::CloseHandle(mutex);
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return ERROR_OUTOFMEMORY;
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}
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#endif
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initialised_ = true;
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::ReleaseMutex(mutex);
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::CloseHandle(mutex);
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return 0;
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}
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // defined(ASIO_WINDOWS)
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#endif // ASIO_DETAIL_IMPL_WIN_STATIC_MUTEX_IPP
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