ceph/src/boost/boost/signals2/detail/lwm_win32_cs.hpp

   1 //
   2 //  boost/signals2/detail/lwm_win32_cs.hpp
   3 //
   4 //  Copyright (c) 2002, 2003 Peter Dimov
   5 //  Copyright (c) 2008 Frank Mori Hess
   6 //  Copyright (c) Microsoft Corporation 2014
   7 //
   8 // Distributed under the Boost Software License, Version 1.0. (See
   9 // accompanying file LICENSE_1_0.txt or copy at
  10 // http://www.boost.org/LICENSE_1_0.txt)
  11 //
  12
  13 #ifndef BOOST_SIGNALS2_LWM_WIN32_CS_HPP
  14 #define BOOST_SIGNALS2_LWM_WIN32_CS_HPP
  15
  16 // MS compatible compilers support #pragma once
  17
  18 #if defined(_MSC_VER)
  19 # pragma once
  20 #endif
  21
  22 #include <boost/assert.hpp>
  23
  24 #ifdef BOOST_USE_WINDOWS_H
  25 #  include <windows.h>
  26 #endif
  27
  28 #include <boost/predef/platform.h>
  29
  30 namespace boost
  31 {
  32
  33 namespace signals2
  34 {
  35
  36 #ifndef BOOST_USE_WINDOWS_H
  37
  38 struct critical_section
  39 {
  40     struct critical_section_debug * DebugInfo;
  41     long LockCount;
  42     long RecursionCount;
  43     void * OwningThread;
  44     void * LockSemaphore;
  45 #if defined(_WIN64)
  46     unsigned __int64 SpinCount;
  47 #else
  48     unsigned long SpinCount;
  49 #endif
  50 };
  51
  52 #if BOOST_PLAT_WINDOWS_RUNTIME
  53 extern "C" __declspec(dllimport) void __stdcall InitializeCriticalSectionEx(critical_section *, unsigned long, unsigned long);
  54 #else
  55 extern "C" __declspec(dllimport) void __stdcall InitializeCriticalSection(critical_section *);
  56 #endif
  57 extern "C" __declspec(dllimport) void __stdcall EnterCriticalSection(critical_section *);
  58 extern "C" __declspec(dllimport) int __stdcall TryEnterCriticalSection(critical_section *);
  59 extern "C" __declspec(dllimport) void __stdcall LeaveCriticalSection(critical_section *);
  60 extern "C" __declspec(dllimport) void __stdcall DeleteCriticalSection(critical_section *);
  61
  62 #else
  63
  64 typedef ::CRITICAL_SECTION critical_section;
  65
  66 #endif // #ifndef BOOST_USE_WINDOWS_H
  67
  68 class mutex
  69 {
  70 private:
  71
  72     critical_section cs_;
  73
  74     mutex(mutex const &);
  75     mutex & operator=(mutex const &);
  76
  77 public:
  78
  79     mutex()
  80     {
  81 #if BOOST_PLAT_WINDOWS_RUNTIME
  82         InitializeCriticalSectionEx(&cs_, 4000, 0);
  83 #else
  84         InitializeCriticalSection(&cs_);
  85 #endif
  86     }
  87
  88     ~mutex()
  89     {
  90         DeleteCriticalSection(&cs_);
  91     }
  92
  93     void lock()
  94     {
  95         EnterCriticalSection(&cs_);
  96     }
  97 // TryEnterCriticalSection only exists on Windows NT 4.0 and later
  98 #if (defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0400))
  99     bool try_lock()
 100     {
 101         return TryEnterCriticalSection(&cs_) != 0;
 102     }
 103 #else
 104     bool try_lock()
 105     {
 106         BOOST_ASSERT(false);
 107         return false;
 108     }
 109 #endif
 110     void unlock()
 111     {
 112         LeaveCriticalSection(&cs_);
 113     }
 114 };
 115
 116 } // namespace signals2
 117
 118 } // namespace boost
 119
 120 #endif // #ifndef BOOST_SIGNALS2_LWM_WIN32_CS_HPP