boost/smart_ptr/detail/lwm_win32_cs.hpp

   1 #ifndef BOOST_SMART_PTR_DETAIL_LWM_WIN32_CS_HPP_INCLUDED
   2 #define BOOST_SMART_PTR_DETAIL_LWM_WIN32_CS_HPP_INCLUDED
   3
   4 // MS compatible compilers support #pragma once
   5
   6 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
   7 # pragma once
   8 #endif
   9
  10 //
  11 //  boost/detail/lwm_win32_cs.hpp
  12 //
  13 //  Copyright (c) 2002, 2003 Peter Dimov
  14 //
  15 // Distributed under the Boost Software License, Version 1.0. (See
  16 // accompanying file LICENSE_1_0.txt or copy at
  17 // http://www.boost.org/LICENSE_1_0.txt)
  18 //
  19
  20 #ifdef BOOST_USE_WINDOWS_H
  21 #  include <windows.h>
  22 #endif
  23
  24 namespace boost
  25 {
  26
  27 namespace detail
  28 {
  29
  30 #ifndef BOOST_USE_WINDOWS_H
  31
  32 struct critical_section
  33 {
  34     struct critical_section_debug * DebugInfo;
  35     long LockCount;
  36     long RecursionCount;
  37     void * OwningThread;
  38     void * LockSemaphore;
  39 #if defined(_WIN64)
  40     unsigned __int64 SpinCount;
  41 #else
  42     unsigned long SpinCount;
  43 #endif
  44 };
  45
  46 extern "C" __declspec(dllimport) void __stdcall InitializeCriticalSection(critical_section *);
  47 extern "C" __declspec(dllimport) void __stdcall EnterCriticalSection(critical_section *);
  48 extern "C" __declspec(dllimport) void __stdcall LeaveCriticalSection(critical_section *);
  49 extern "C" __declspec(dllimport) void __stdcall DeleteCriticalSection(critical_section *);
  50
  51 #else
  52
  53 typedef ::CRITICAL_SECTION critical_section;
  54
  55 #endif // #ifndef BOOST_USE_WINDOWS_H
  56
  57 class lightweight_mutex
  58 {
  59 private:
  60
  61     critical_section cs_;
  62
  63     lightweight_mutex(lightweight_mutex const &);
  64     lightweight_mutex & operator=(lightweight_mutex const &);
  65
  66 public:
  67
  68     lightweight_mutex()
  69     {
  70         InitializeCriticalSection(&cs_);
  71     }
  72
  73     ~lightweight_mutex()
  74     {
  75         DeleteCriticalSection(&cs_);
  76     }
  77
  78     class scoped_lock;
  79     friend class scoped_lock;
  80
  81     class scoped_lock
  82     {
  83     private:
  84
  85         lightweight_mutex & m_;
  86
  87         scoped_lock(scoped_lock const &);
  88         scoped_lock & operator=(scoped_lock const &);
  89
  90     public:
  91
  92         explicit scoped_lock(lightweight_mutex & m): m_(m)
  93         {
  94             EnterCriticalSection(&m_.cs_);
  95         }
  96
  97         ~scoped_lock()
  98         {
  99             LeaveCriticalSection(&m_.cs_);
 100         }
 101     };
 102 };
 103
 104 } // namespace detail
 105
 106 } // namespace boost
 107
 108 #endif // #ifndef BOOST_SMART_PTR_DETAIL_LWM_WIN32_CS_HPP_INCLUDED