blob: e3dd4f7edd740a93a6a390674ccc4907cdbd2d7d (
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
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
|
//
// detail/resolver_service_base.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2016 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_RESOLVER_SERVICE_BASE_HPP
#define ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/error.hpp"
#include "asio/executor_work_guard.hpp"
#include "asio/io_context.hpp"
#include "asio/detail/mutex.hpp"
#include "asio/detail/noncopyable.hpp"
#include "asio/detail/resolve_op.hpp"
#include "asio/detail/socket_ops.hpp"
#include "asio/detail/socket_types.hpp"
#include "asio/detail/scoped_ptr.hpp"
#include "asio/detail/thread.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
class resolver_service_base
{
public:
// The implementation type of the resolver. A cancellation token is used to
// indicate to the background thread that the operation has been cancelled.
typedef socket_ops::shared_cancel_token_type implementation_type;
// Constructor.
ASIO_DECL resolver_service_base(asio::io_context& io_context);
// Destructor.
ASIO_DECL ~resolver_service_base();
// Destroy all user-defined handler objects owned by the service.
ASIO_DECL void base_shutdown();
// Perform any fork-related housekeeping.
ASIO_DECL void base_notify_fork(
asio::io_context::fork_event fork_ev);
// Construct a new resolver implementation.
ASIO_DECL void construct(implementation_type& impl);
// Destroy a resolver implementation.
ASIO_DECL void destroy(implementation_type&);
// Move-construct a new resolver implementation.
ASIO_DECL void move_construct(implementation_type& impl,
implementation_type& other_impl);
// Move-assign from another resolver implementation.
ASIO_DECL void move_assign(implementation_type& impl,
resolver_service_base& other_service,
implementation_type& other_impl);
// Cancel pending asynchronous operations.
ASIO_DECL void cancel(implementation_type& impl);
protected:
// Helper function to start an asynchronous resolve operation.
ASIO_DECL void start_resolve_op(resolve_op* op);
#if !defined(ASIO_WINDOWS_RUNTIME)
// Helper class to perform exception-safe cleanup of addrinfo objects.
class auto_addrinfo
: private asio::detail::noncopyable
{
public:
explicit auto_addrinfo(asio::detail::addrinfo_type* ai)
: ai_(ai)
{
}
~auto_addrinfo()
{
if (ai_)
socket_ops::freeaddrinfo(ai_);
}
operator asio::detail::addrinfo_type*()
{
return ai_;
}
private:
asio::detail::addrinfo_type* ai_;
};
#endif // !defined(ASIO_WINDOWS_RUNTIME)
// Helper class to run the work io_context in a thread.
class work_io_context_runner;
// Start the work thread if it's not already running.
ASIO_DECL void start_work_thread();
// The io_context implementation used to post completions.
io_context_impl& io_context_impl_;
private:
// Mutex to protect access to internal data.
asio::detail::mutex mutex_;
// Private io_context used for performing asynchronous host resolution.
asio::detail::scoped_ptr<asio::io_context> work_io_context_;
// The work io_context implementation used to post completions.
io_context_impl& work_io_context_impl_;
// Work for the private io_context to perform.
asio::executor_work_guard<
asio::io_context::executor_type> work_;
// Thread used for running the work io_context's run loop.
asio::detail::scoped_ptr<asio::detail::thread> work_thread_;
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#if defined(ASIO_HEADER_ONLY)
# include "asio/detail/impl/resolver_service_base.ipp"
#endif // defined(ASIO_HEADER_ONLY)
#endif // ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP
|
