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Side by Side Diff: mojo/public/cpp/system/watcher.h

Issue 2358133002: Turn //mojo/public/cpp/bindings and //mojo/public/cpp/system into components (Closed)
Patch Set: Fix wording Created 4 years, 3 months ago
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1 // Copyright 2016 The Chromium Authors. All rights reserved. 1 // Copyright 2016 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef MOJO_PUBLIC_CPP_SYSTEM_WATCHER_H_ 5 #ifndef MOJO_PUBLIC_CPP_SYSTEM_WATCHER_H_
6 #define MOJO_PUBLIC_CPP_SYSTEM_WATCHER_H_ 6 #define MOJO_PUBLIC_CPP_SYSTEM_WATCHER_H_
7 7
8 #include <memory> 8 #include <memory>
9 9
10 #include "base/callback.h" 10 #include "base/callback.h"
11 #include "base/macros.h" 11 #include "base/macros.h"
12 #include "base/memory/ref_counted.h" 12 #include "base/memory/ref_counted.h"
13 #include "base/memory/weak_ptr.h" 13 #include "base/memory/weak_ptr.h"
14 #include "base/single_thread_task_runner.h" 14 #include "base/single_thread_task_runner.h"
15 #include "base/threading/thread_checker.h" 15 #include "base/threading/thread_checker.h"
16 #include "base/threading/thread_task_runner_handle.h" 16 #include "base/threading/thread_task_runner_handle.h"
17 #include "mojo/public/c/system/types.h" 17 #include "mojo/public/c/system/types.h"
18 #include "mojo/public/cpp/system/handle.h" 18 #include "mojo/public/cpp/system/handle.h"
19 #include "mojo/public/cpp/system/system_export.h"
19 20
20 namespace mojo { 21 namespace mojo {
21 22
22 // A Watcher watches a single Mojo handle for signal state changes. 23 // A Watcher watches a single Mojo handle for signal state changes.
23 // 24 //
24 // NOTE: Watchers may only be used on threads which have a running MessageLoop. 25 // NOTE: Watchers may only be used on threads which have a running MessageLoop.
25 class Watcher { 26 class MOJO_CPP_SYSTEM_EXPORT Watcher {
26 public: 27 public:
27 // A callback to be called any time a watched handle changes state in some 28 // A callback to be called any time a watched handle changes state in some
28 // interesting way. The |result| argument indicates one of the following 29 // interesting way. The |result| argument indicates one of the following
29 // conditions depending on its value: 30 // conditions depending on its value:
30 // 31 //
31 // |MOJO_RESULT_OK|: One or more of the signals being watched is satisfied. 32 // |MOJO_RESULT_OK|: One or more of the signals being watched is satisfied.
32 // 33 //
33 // |MOJO_RESULT_FAILED_PRECONDITION|: None of the signals being watched can 34 // |MOJO_RESULT_FAILED_PRECONDITION|: None of the signals being watched can
34 // ever be satisfied again. 35 // ever be satisfied again.
35 // 36 //
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116 ReadyCallback callback_; 117 ReadyCallback callback_;
117 118
118 base::WeakPtrFactory<Watcher> weak_factory_; 119 base::WeakPtrFactory<Watcher> weak_factory_;
119 120
120 DISALLOW_COPY_AND_ASSIGN(Watcher); 121 DISALLOW_COPY_AND_ASSIGN(Watcher);
121 }; 122 };
122 123
123 } // namespace mojo 124 } // namespace mojo
124 125
125 #endif // MOJO_PUBLIC_CPP_SYSTEM_WATCHER_H_ 126 #endif // MOJO_PUBLIC_CPP_SYSTEM_WATCHER_H_
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