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 //  Copyright (c) Microsoft Corporation 2014
  15 //
  16 // Distributed under the Boost Software License, Version 1.0. (See
  17 // accompanying file LICENSE_1_0.txt or copy at
  18 // http://www.boost.org/LICENSE_1_0.txt)
  19 //
  20
  21 #include <boost/predef.h>
  22
  23 #ifdef BOOST_USE_WINDOWS_H
  24 #  include <windows.h>
  25 #endif
  26
  27 namespace boost
  28 {
  29
  30 namespace detail
  31 {
  32
  33 #ifndef BOOST_USE_WINDOWS_H
  34
  35 struct critical_section
  36 {
  37     struct critical_section_debug * DebugInfo;
  38     long LockCount;
  39     long RecursionCount;
  40     void * OwningThread;
  41     void * LockSemaphore;
  42 #if defined(_WIN64)
  43     unsigned __int64 SpinCount;
  44 #else
  45     unsigned long SpinCount;
  46 #endif
  47 };
  48
  49 #if BOOST_PLAT_WINDOWS_RUNTIME
  50 extern "C" __declspec(dllimport) void __stdcall InitializeCriticalSectionEx(critical_section *, unsigned long, unsigned long);
  51 #else
  52 extern "C" __declspec(dllimport) void __stdcall InitializeCriticalSection(critical_section *);
  53 #endif
  54 extern "C" __declspec(dllimport) void __stdcall EnterCriticalSection(critical_section *);
  55 extern "C" __declspec(dllimport) void __stdcall LeaveCriticalSection(critical_section *);
  56 extern "C" __declspec(dllimport) void __stdcall DeleteCriticalSection(critical_section *);
  57
  58 #else
  59
  60 typedef ::CRITICAL_SECTION critical_section;
  61
  62 #endif // #ifndef BOOST_USE_WINDOWS_H
  63
  64 class lightweight_mutex
  65 {
  66 private:
  67
  68     critical_section cs_;
  69
  70     lightweight_mutex(lightweight_mutex const &);
  71     lightweight_mutex & operator=(lightweight_mutex const &);
  72
  73 public:
  74
  75     lightweight_mutex()
  76     {
  77 #if BOOST_PLAT_WINDOWS_RUNTIME
  78         InitializeCriticalSectionEx(&cs_, 4000, 0);
  79 #else
  80         InitializeCriticalSection(&cs_);
  81 #endif
  82     }
  83
  84     ~lightweight_mutex()
  85     {
  86         DeleteCriticalSection(&cs_);
  87     }
  88
  89     class scoped_lock;
  90     friend class scoped_lock;
  91
  92     class scoped_lock
  93     {
  94     private:
  95
  96         lightweight_mutex & m_;
  97
  98         scoped_lock(scoped_lock const &);
  99         scoped_lock & operator=(scoped_lock const &);
 100
 101     public:
 102
 103         explicit scoped_lock(lightweight_mutex & m): m_(m)
 104         {
 105             EnterCriticalSection(&m_.cs_);
 106         }
 107
 108         ~scoped_lock()
 109         {
 110             LeaveCriticalSection(&m_.cs_);
 111         }
 112     };
 113 };
 114
 115 } // namespace detail
 116
 117 } // namespace boost
 118
 119 #endif // #ifndef BOOST_SMART_PTR_DETAIL_LWM_WIN32_CS_HPP_INCLUDED