signals2/detail/lwm_win32_cs.hpp

0001 //
0002 //  boost/signals2/detail/lwm_win32_cs.hpp
0003 //
0004 //  Copyright (c) 2002, 2003 Peter Dimov
0005 //  Copyright (c) 2008 Frank Mori Hess
0006 //
0007 // Distributed under the Boost Software License, Version 1.0. (See
0008 // accompanying file LICENSE_1_0.txt or copy at
0009 // http://www.boost.org/LICENSE_1_0.txt)
0010 //
0011
0012 #ifndef BOOST_SIGNALS2_LWM_WIN32_CS_HPP
0013 #define BOOST_SIGNALS2_LWM_WIN32_CS_HPP
0014
0015 // MS compatible compilers support #pragma once
0016
0017 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
0018 # pragma once
0019 #endif
0020
0021 #include <boost/assert.hpp>
0022
0023 #ifdef BOOST_USE_WINDOWS_H
0024
0025 #include <windows.h>
0026
0027 #else
0028
0029 struct _RTL_CRITICAL_SECTION;
0030
0031 #endif
0032
0033 namespace boost
0034 {
0035
0036 namespace signals2
0037 {
0038
0039 namespace detail
0040 {
0041
0042 #ifndef BOOST_USE_WINDOWS_H
0043
0044 struct critical_section
0045 {
0046     struct critical_section_debug * DebugInfo;
0047     long LockCount;
0048     long RecursionCount;
0049     void * OwningThread;
0050     void * LockSemaphore;
0051 #if defined(_WIN64)
0052     unsigned __int64 SpinCount;
0053 #else
0054     unsigned long SpinCount;
0055 #endif
0056 };
0057
0058 extern "C" __declspec(dllimport) void __stdcall InitializeCriticalSection(::_RTL_CRITICAL_SECTION *);
0059 extern "C" __declspec(dllimport) void __stdcall EnterCriticalSection(::_RTL_CRITICAL_SECTION *);
0060 extern "C" __declspec(dllimport) int __stdcall TryEnterCriticalSection(::_RTL_CRITICAL_SECTION *);
0061 extern "C" __declspec(dllimport) void __stdcall LeaveCriticalSection(::_RTL_CRITICAL_SECTION *);
0062 extern "C" __declspec(dllimport) void __stdcall DeleteCriticalSection(::_RTL_CRITICAL_SECTION *);
0063
0064 typedef ::_RTL_CRITICAL_SECTION rtl_critical_section;
0065
0066 #else // #ifndef BOOST_USE_WINDOWS_H
0067
0068 typedef ::CRITICAL_SECTION critical_section;
0069
0070 using ::InitializeCriticalSection;
0071 using ::EnterCriticalSection;
0072 using ::TryEnterCriticalSection;
0073 using ::LeaveCriticalSection;
0074 using ::DeleteCriticalSection;
0075
0076 typedef ::CRITICAL_SECTION rtl_critical_section;
0077
0078 #endif // #ifndef BOOST_USE_WINDOWS_H
0079
0080 } // namespace detail
0081
0082 class mutex
0083 {
0084 private:
0085
0086     boost::signals2::detail::critical_section cs_;
0087
0088     mutex(mutex const &);
0089     mutex & operator=(mutex const &);
0090
0091 public:
0092
0093     mutex()
0094     {
0095         boost::signals2::detail::InitializeCriticalSection(reinterpret_cast< boost::signals2::detail::rtl_critical_section* >(&cs_));
0096     }
0097
0098     ~mutex()
0099     {
0100         boost::signals2::detail::DeleteCriticalSection(reinterpret_cast< boost::signals2::detail::rtl_critical_section* >(&cs_));
0101     }
0102
0103     void lock()
0104     {
0105         boost::signals2::detail::EnterCriticalSection(reinterpret_cast< boost::signals2::detail::rtl_critical_section* >(&cs_));
0106     }
0107 // TryEnterCriticalSection only exists on Windows NT 4.0 and later
0108 #if (defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0400))
0109     bool try_lock()
0110     {
0111         return boost::signals2::detail::TryEnterCriticalSection(reinterpret_cast< boost::signals2::detail::rtl_critical_section* >(&cs_)) != 0;
0112     }
0113 #else
0114     bool try_lock()
0115     {
0116         BOOST_ASSERT(false);
0117         return false;
0118     }
0119 #endif
0120     void unlock()
0121     {
0122         boost::signals2::detail::LeaveCriticalSection(reinterpret_cast< boost::signals2::detail::rtl_critical_section* >(&cs_));
0123     }
0124 };
0125
0126 } // namespace signals2
0127
0128 } // namespace boost
0129
0130 #endif // #ifndef BOOST_SIGNALS2_LWM_WIN32_CS_HPP