1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
//
// detail/impl/win_static_mutex.ipp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef ASIO_DETAIL_IMPL_WIN_STATIC_MUTEX_IPP
#define ASIO_DETAIL_IMPL_WIN_STATIC_MUTEX_IPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#if defined(ASIO_WINDOWS)
#include <cstdio>
#include "asio/detail/throw_error.hpp"
#include "asio/detail/win_static_mutex.hpp"
#include "asio/error.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
void win_static_mutex::init()
{
int error = do_init();
asio::error_code ec(error,
asio::error::get_system_category());
asio::detail::throw_error(ec, "static_mutex");
}
int win_static_mutex::do_init()
{
using namespace std; // For sprintf.
wchar_t mutex_name[128];
#if defined(ASIO_HAS_SECURE_RTL)
swprintf_s(
#else // defined(ASIO_HAS_SECURE_RTL)
_snwprintf(
#endif // defined(ASIO_HAS_SECURE_RTL)
mutex_name, 128, L"asio-58CCDC44-6264-4842-90C2-F3C545CB8AA7-%u-%p",
static_cast<unsigned int>(::GetCurrentProcessId()), this);
#if defined(ASIO_WINDOWS_APP)
HANDLE mutex = ::CreateMutexExW(0, mutex_name, CREATE_MUTEX_INITIAL_OWNER, 0);
#else // defined(ASIO_WINDOWS_APP)
HANDLE mutex = ::CreateMutexW(0, TRUE, mutex_name);
#endif // defined(ASIO_WINDOWS_APP)
DWORD last_error = ::GetLastError();
if (mutex == 0)
return ::GetLastError();
if (last_error == ERROR_ALREADY_EXISTS)
{
#if defined(ASIO_WINDOWS_APP)
::WaitForSingleObjectEx(mutex, INFINITE, false);
#else // defined(ASIO_WINDOWS_APP)
::WaitForSingleObject(mutex, INFINITE);
#endif // defined(ASIO_WINDOWS_APP)
}
if (initialised_)
{
::ReleaseMutex(mutex);
::CloseHandle(mutex);
return 0;
}
#if defined(__MINGW32__)
// Not sure if MinGW supports structured exception handling, so for now
// we'll just call the Windows API and hope.
# if defined(UNDER_CE)
::InitializeCriticalSection(&crit_section_);
# else
if (!::InitializeCriticalSectionAndSpinCount(&crit_section_, 0x80000000))
{
last_error = ::GetLastError();
::ReleaseMutex(mutex);
::CloseHandle(mutex);
return last_error;
}
# endif
#else
__try
{
# if defined(UNDER_CE)
::InitializeCriticalSection(&crit_section_);
# elif defined(ASIO_WINDOWS_APP)
if (!::InitializeCriticalSectionEx(&crit_section_, 0, 0))
{
last_error = ::GetLastError();
::ReleaseMutex(mutex);
::CloseHandle(mutex);
return last_error;
}
# else
if (!::InitializeCriticalSectionAndSpinCount(&crit_section_, 0x80000000))
{
last_error = ::GetLastError();
::ReleaseMutex(mutex);
::CloseHandle(mutex);
return last_error;
}
# endif
}
__except(GetExceptionCode() == STATUS_NO_MEMORY
? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
{
::ReleaseMutex(mutex);
::CloseHandle(mutex);
return ERROR_OUTOFMEMORY;
}
#endif
initialised_ = true;
::ReleaseMutex(mutex);
::CloseHandle(mutex);
return 0;
}
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // defined(ASIO_WINDOWS)
#endif // ASIO_DETAIL_IMPL_WIN_STATIC_MUTEX_IPP
|
