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1 | // | |
2 | // detail/impl/win_static_mutex.ipp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com) | |
6 | // | |
7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | // | |
10 | ||
11 | #ifndef BOOST_ASIO_DETAIL_IMPL_WIN_STATIC_MUTEX_IPP | |
12 | #define BOOST_ASIO_DETAIL_IMPL_WIN_STATIC_MUTEX_IPP | |
13 | ||
14 | #if defined(_MSC_VER) && (_MSC_VER >= 1200) | |
15 | # pragma once | |
16 | #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) | |
17 | ||
18 | #include <boost/asio/detail/config.hpp> | |
19 | ||
20 | #if defined(BOOST_ASIO_WINDOWS) | |
21 | ||
22 | #include <cstdio> | |
23 | #include <boost/asio/detail/throw_error.hpp> | |
24 | #include <boost/asio/detail/win_static_mutex.hpp> | |
25 | #include <boost/asio/error.hpp> | |
26 | ||
27 | #include <boost/asio/detail/push_options.hpp> | |
28 | ||
29 | namespace boost { | |
30 | namespace asio { | |
31 | namespace detail { | |
32 | ||
33 | void win_static_mutex::init() | |
34 | { | |
35 | int error = do_init(); | |
36 | boost::system::error_code ec(error, | |
37 | boost::asio::error::get_system_category()); | |
38 | boost::asio::detail::throw_error(ec, "static_mutex"); | |
39 | } | |
40 | ||
41 | int win_static_mutex::do_init() | |
42 | { | |
43 | using namespace std; // For sprintf. | |
44 | wchar_t mutex_name[128]; | |
45 | #if defined(BOOST_ASIO_HAS_SECURE_RTL) | |
46 | swprintf_s( | |
47 | #else // defined(BOOST_ASIO_HAS_SECURE_RTL) | |
48 | _snwprintf( | |
49 | #endif // defined(BOOST_ASIO_HAS_SECURE_RTL) | |
50 | mutex_name, 128, L"asio-58CCDC44-6264-4842-90C2-F3C545CB8AA7-%u-%p", | |
51 | static_cast<unsigned int>(::GetCurrentProcessId()), this); | |
52 | ||
53 | #if defined(BOOST_ASIO_WINDOWS_APP) | |
54 | HANDLE mutex = ::CreateMutexExW(0, mutex_name, CREATE_MUTEX_INITIAL_OWNER, 0); | |
55 | #else // defined(BOOST_ASIO_WINDOWS_APP) | |
56 | HANDLE mutex = ::CreateMutexW(0, TRUE, mutex_name); | |
57 | #endif // defined(BOOST_ASIO_WINDOWS_APP) | |
58 | DWORD last_error = ::GetLastError(); | |
59 | if (mutex == 0) | |
60 | return ::GetLastError(); | |
61 | ||
62 | if (last_error == ERROR_ALREADY_EXISTS) | |
63 | { | |
64 | #if defined(BOOST_ASIO_WINDOWS_APP) | |
65 | ::WaitForSingleObjectEx(mutex, INFINITE, false); | |
66 | #else // defined(BOOST_ASIO_WINDOWS_APP) | |
67 | ::WaitForSingleObject(mutex, INFINITE); | |
68 | #endif // defined(BOOST_ASIO_WINDOWS_APP) | |
69 | } | |
70 | ||
71 | if (initialised_) | |
72 | { | |
73 | ::ReleaseMutex(mutex); | |
74 | ::CloseHandle(mutex); | |
75 | return 0; | |
76 | } | |
77 | ||
78 | #if defined(__MINGW32__) | |
79 | // Not sure if MinGW supports structured exception handling, so for now | |
80 | // we'll just call the Windows API and hope. | |
81 | # if defined(UNDER_CE) | |
82 | ::InitializeCriticalSection(&crit_section_); | |
83 | # else | |
84 | if (!::InitializeCriticalSectionAndSpinCount(&crit_section_, 0x80000000)) | |
85 | { | |
86 | last_error = ::GetLastError(); | |
87 | ::ReleaseMutex(mutex); | |
88 | ::CloseHandle(mutex); | |
89 | return last_error; | |
90 | } | |
91 | # endif | |
92 | #else | |
93 | __try | |
94 | { | |
95 | # if defined(UNDER_CE) | |
96 | ::InitializeCriticalSection(&crit_section_); | |
97 | # elif defined(BOOST_ASIO_WINDOWS_APP) | |
98 | if (!::InitializeCriticalSectionEx(&crit_section_, 0, 0)) | |
99 | { | |
100 | last_error = ::GetLastError(); | |
101 | ::ReleaseMutex(mutex); | |
102 | ::CloseHandle(mutex); | |
103 | return last_error; | |
104 | } | |
105 | # else | |
106 | if (!::InitializeCriticalSectionAndSpinCount(&crit_section_, 0x80000000)) | |
107 | { | |
108 | last_error = ::GetLastError(); | |
109 | ::ReleaseMutex(mutex); | |
110 | ::CloseHandle(mutex); | |
111 | return last_error; | |
112 | } | |
113 | # endif | |
114 | } | |
115 | __except(GetExceptionCode() == STATUS_NO_MEMORY | |
116 | ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) | |
117 | { | |
118 | ::ReleaseMutex(mutex); | |
119 | ::CloseHandle(mutex); | |
120 | return ERROR_OUTOFMEMORY; | |
121 | } | |
122 | #endif | |
123 | ||
124 | initialised_ = true; | |
125 | ::ReleaseMutex(mutex); | |
126 | ::CloseHandle(mutex); | |
127 | return 0; | |
128 | } | |
129 | ||
130 | } // namespace detail | |
131 | } // namespace asio | |
132 | } // namespace boost | |
133 | ||
134 | #include <boost/asio/detail/pop_options.hpp> | |
135 | ||
136 | #endif // defined(BOOST_ASIO_WINDOWS) | |
137 | ||
138 | #endif // BOOST_ASIO_DETAIL_IMPL_WIN_STATIC_MUTEX_IPP |