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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
//
// detail/deadline_timer_service.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2010 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 BOOST_ASIO_DETAIL_DEADLINE_TIMER_SERVICE_HPP
#define BOOST_ASIO_DETAIL_DEADLINE_TIMER_SERVICE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#include <cstddef>
#include <boost/asio/error.hpp>
#include <boost/asio/io_service.hpp>
#include <boost/asio/detail/bind_handler.hpp>
#include <boost/asio/detail/fenced_block.hpp>
#include <boost/asio/detail/noncopyable.hpp>
#include <boost/asio/detail/socket_ops.hpp>
#include <boost/asio/detail/socket_types.hpp>
#include <boost/asio/detail/timer_op.hpp>
#include <boost/asio/detail/timer_queue.hpp>
#include <boost/asio/detail/timer_scheduler.hpp>
#include <boost/asio/detail/wait_handler.hpp>
#include <boost/asio/detail/push_options.hpp>
#include <boost/date_time/posix_time/posix_time_types.hpp>
#include <boost/asio/detail/pop_options.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
template <typename Time_Traits>
class deadline_timer_service
{
public:
// The time type.
typedef typename Time_Traits::time_type time_type;
// The duration type.
typedef typename Time_Traits::duration_type duration_type;
// The implementation type of the timer. This type is dependent on the
// underlying implementation of the timer service.
struct implementation_type
: private boost::asio::detail::noncopyable
{
time_type expiry;
bool might_have_pending_waits;
typename timer_queue<Time_Traits>::per_timer_data timer_data;
};
// Constructor.
deadline_timer_service(boost::asio::io_service& io_service)
: scheduler_(boost::asio::use_service<timer_scheduler>(io_service))
{
scheduler_.init_task();
scheduler_.add_timer_queue(timer_queue_);
}
// Destructor.
~deadline_timer_service()
{
scheduler_.remove_timer_queue(timer_queue_);
}
// Destroy all user-defined handler objects owned by the service.
void shutdown_service()
{
}
// Construct a new timer implementation.
void construct(implementation_type& impl)
{
impl.expiry = time_type();
impl.might_have_pending_waits = false;
}
// Destroy a timer implementation.
void destroy(implementation_type& impl)
{
boost::system::error_code ec;
cancel(impl, ec);
}
// Cancel any asynchronous wait operations associated with the timer.
std::size_t cancel(implementation_type& impl, boost::system::error_code& ec)
{
if (!impl.might_have_pending_waits)
{
ec = boost::system::error_code();
return 0;
}
std::size_t count = scheduler_.cancel_timer(timer_queue_, impl.timer_data);
impl.might_have_pending_waits = false;
ec = boost::system::error_code();
return count;
}
// Get the expiry time for the timer as an absolute time.
time_type expires_at(const implementation_type& impl) const
{
return impl.expiry;
}
// Set the expiry time for the timer as an absolute time.
std::size_t expires_at(implementation_type& impl,
const time_type& expiry_time, boost::system::error_code& ec)
{
std::size_t count = cancel(impl, ec);
impl.expiry = expiry_time;
ec = boost::system::error_code();
return count;
}
// Get the expiry time for the timer relative to now.
duration_type expires_from_now(const implementation_type& impl) const
{
return Time_Traits::subtract(expires_at(impl), Time_Traits::now());
}
// Set the expiry time for the timer relative to now.
std::size_t expires_from_now(implementation_type& impl,
const duration_type& expiry_time, boost::system::error_code& ec)
{
return expires_at(impl,
Time_Traits::add(Time_Traits::now(), expiry_time), ec);
}
// Perform a blocking wait on the timer.
void wait(implementation_type& impl, boost::system::error_code& ec)
{
time_type now = Time_Traits::now();
while (Time_Traits::less_than(now, impl.expiry))
{
boost::posix_time::time_duration timeout =
Time_Traits::to_posix_duration(Time_Traits::subtract(impl.expiry, now));
::timeval tv;
tv.tv_sec = timeout.total_seconds();
tv.tv_usec = timeout.total_microseconds() % 1000000;
boost::system::error_code ec;
socket_ops::select(0, 0, 0, 0, &tv, ec);
now = Time_Traits::now();
}
ec = boost::system::error_code();
}
// Start an asynchronous wait on the timer.
template <typename Handler>
void async_wait(implementation_type& impl, Handler handler)
{
// Allocate and construct an operation to wrap the handler.
typedef wait_handler<Handler> op;
typename op::ptr p = { boost::addressof(handler),
boost_asio_handler_alloc_helpers::allocate(
sizeof(op), handler), 0 };
p.p = new (p.v) op(handler);
impl.might_have_pending_waits = true;
scheduler_.schedule_timer(timer_queue_, impl.expiry, impl.timer_data, p.p);
p.v = p.p = 0;
}
private:
// The queue of timers.
timer_queue<Time_Traits> timer_queue_;
// The object that schedules and executes timers. Usually a reactor.
timer_scheduler& scheduler_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_DETAIL_DEADLINE_TIMER_SERVICE_HPP
|
Swift