blob: 0fda401e3bbbaa7a8711bfe257dfc6c35756f929 (
plain)
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
|
//
// detail/conditionally_enabled_event.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// 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_CONDITIONALLY_ENABLED_EVENT_HPP
#define ASIO_DETAIL_CONDITIONALLY_ENABLED_EVENT_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/detail/conditionally_enabled_mutex.hpp"
#include "asio/detail/event.hpp"
#include "asio/detail/noncopyable.hpp"
#include "asio/detail/null_event.hpp"
#include "asio/detail/scoped_lock.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
// Mutex adapter used to conditionally enable or disable locking.
class conditionally_enabled_event
: private noncopyable
{
public:
// Constructor.
conditionally_enabled_event()
{
}
// Destructor.
~conditionally_enabled_event()
{
}
// Signal the event. (Retained for backward compatibility.)
void signal(conditionally_enabled_mutex::scoped_lock& lock)
{
if (lock.mutex_.enabled_)
event_.signal(lock);
}
// Signal all waiters.
void signal_all(conditionally_enabled_mutex::scoped_lock& lock)
{
if (lock.mutex_.enabled_)
event_.signal_all(lock);
}
// Unlock the mutex and signal one waiter.
void unlock_and_signal_one(
conditionally_enabled_mutex::scoped_lock& lock)
{
if (lock.mutex_.enabled_)
event_.unlock_and_signal_one(lock);
}
// If there's a waiter, unlock the mutex and signal it.
bool maybe_unlock_and_signal_one(
conditionally_enabled_mutex::scoped_lock& lock)
{
if (lock.mutex_.enabled_)
return event_.maybe_unlock_and_signal_one(lock);
else
return false;
}
// Reset the event.
void clear(conditionally_enabled_mutex::scoped_lock& lock)
{
if (lock.mutex_.enabled_)
event_.clear(lock);
}
// Wait for the event to become signalled.
void wait(conditionally_enabled_mutex::scoped_lock& lock)
{
if (lock.mutex_.enabled_)
event_.wait(lock);
else
null_event().wait(lock);
}
// Timed wait for the event to become signalled.
bool wait_for_usec(
conditionally_enabled_mutex::scoped_lock& lock, long usec)
{
if (lock.mutex_.enabled_)
return event_.wait_for_usec(lock, usec);
else
return null_event().wait_for_usec(lock, usec);
}
private:
asio::detail::event event_;
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_CONDITIONALLY_ENABLED_EVENT_HPP
|
