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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 |