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Side by Side Diff: mojo/public/cpp/bindings/sync_handle_watcher.h

Issue 2358133002: Turn //mojo/public/cpp/bindings and //mojo/public/cpp/system into components (Closed)
Patch Set: Fix wording Created 4 years, 2 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_BINDINGS_SYNC_HANDLE_WATCHER_H_ 5 #ifndef MOJO_PUBLIC_CPP_BINDINGS_SYNC_HANDLE_WATCHER_H_
6 #define MOJO_PUBLIC_CPP_BINDINGS_SYNC_HANDLE_WATCHER_H_ 6 #define MOJO_PUBLIC_CPP_BINDINGS_SYNC_HANDLE_WATCHER_H_
7 7
8 #include "base/macros.h" 8 #include "base/macros.h"
9 #include "base/memory/ref_counted.h" 9 #include "base/memory/ref_counted.h"
10 #include "base/threading/thread_checker.h" 10 #include "base/threading/thread_checker.h"
11 #include "mojo/public/cpp/bindings/bindings_export.h"
11 #include "mojo/public/cpp/bindings/sync_handle_registry.h" 12 #include "mojo/public/cpp/bindings/sync_handle_registry.h"
12 #include "mojo/public/cpp/system/core.h" 13 #include "mojo/public/cpp/system/core.h"
13 14
14 namespace mojo { 15 namespace mojo {
15 16
16 // SyncHandleWatcher supports watching a handle synchronously. It also supports 17 // SyncHandleWatcher supports watching a handle synchronously. It also supports
17 // registering the handle with a thread-local storage (SyncHandleRegistry), so 18 // registering the handle with a thread-local storage (SyncHandleRegistry), so
18 // that when other SyncHandleWatcher instances on the same thread perform sync 19 // that when other SyncHandleWatcher instances on the same thread perform sync
19 // handle watching, this handle will be watched together. 20 // handle watching, this handle will be watched together.
20 // 21 //
21 // SyncHandleWatcher is used for sync methods. While a sync call is waiting for 22 // SyncHandleWatcher is used for sync methods. While a sync call is waiting for
22 // response, we would like to block the thread. On the other hand, we need 23 // response, we would like to block the thread. On the other hand, we need
23 // incoming sync method requests on the same thread to be able to reenter. We 24 // incoming sync method requests on the same thread to be able to reenter. We
24 // also need master interface endpoints to continue dispatching messages for 25 // also need master interface endpoints to continue dispatching messages for
25 // associated endpoints on different threads. 26 // associated endpoints on different threads.
26 // 27 //
27 // This class is not thread safe. 28 // This class is not thread safe.
28 class SyncHandleWatcher { 29 class MOJO_CPP_BINDINGS_EXPORT SyncHandleWatcher {
29 public: 30 public:
30 // Note: |handle| must outlive this object. 31 // Note: |handle| must outlive this object.
31 SyncHandleWatcher(const Handle& handle, 32 SyncHandleWatcher(const Handle& handle,
32 MojoHandleSignals handle_signals, 33 MojoHandleSignals handle_signals,
33 const SyncHandleRegistry::HandleCallback& callback); 34 const SyncHandleRegistry::HandleCallback& callback);
34 35
35 ~SyncHandleWatcher(); 36 ~SyncHandleWatcher();
36 37
37 // Registers |handle_| with SyncHandleRegistry, so that when others perform 38 // Registers |handle_| with SyncHandleRegistry, so that when others perform
38 // sync handle watching on the same thread, |handle_| will be watched 39 // sync handle watching on the same thread, |handle_| will be watched
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65 scoped_refptr<base::RefCountedData<bool>> destroyed_; 66 scoped_refptr<base::RefCountedData<bool>> destroyed_;
66 67
67 base::ThreadChecker thread_checker_; 68 base::ThreadChecker thread_checker_;
68 69
69 DISALLOW_COPY_AND_ASSIGN(SyncHandleWatcher); 70 DISALLOW_COPY_AND_ASSIGN(SyncHandleWatcher);
70 }; 71 };
71 72
72 } // namespace mojo 73 } // namespace mojo
73 74
74 #endif // MOJO_PUBLIC_CPP_BINDINGS_SYNC_HANDLE_WATCHER_H_ 75 #endif // MOJO_PUBLIC_CPP_BINDINGS_SYNC_HANDLE_WATCHER_H_
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