1 /*
2 * Copyright (C) 2013 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Neither the name of Google Inc. nor the names of its
11 * contributors may be used to endorse or promote products derived from
12 * this software without specific prior written permission.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
15 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
17 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
18 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifndef MainThreadTaskRunner_h
28 #define MainThreadTaskRunner_h
29
30 #include "platform/Timer.h"
31
32 #include "wtf/FastAllocBase.h"
33 #include "wtf/Noncopyable.h"
34 #include "wtf/OwnPtr.h"
35 #include "wtf/PassOwnPtr.h"
36 #include "wtf/Vector.h"
37 #include "wtf/WeakPtr.h"
38
39 namespace WebCore {
40
41 class ExecutionContext;
42 class ExecutionContextTask;
43
44 class MainThreadTaskRunner {
45 WTF_MAKE_NONCOPYABLE(MainThreadTaskRunner);
46 WTF_MAKE_FAST_ALLOCATED;
47
48 public:
49 static PassOwnPtr<MainThreadTaskRunner> create(ExecutionContext*);
50
51 ~MainThreadTaskRunner();
52
53 void postTask(PassOwnPtr<ExecutionContextTask>); // Executes the task on context's thread asynchronously.
54 void perform(PassOwnPtr<ExecutionContextTask>);
55 void suspend();
56 void resume();
57
58 private:
59 explicit MainThreadTaskRunner(ExecutionContext*);
60
61 void pendingTasksTimerFired(Timer<MainThreadTaskRunner>*);
62
63 ExecutionContext* m_context;
64 WeakPtrFactory<MainThreadTaskRunner> m_weakFactory;
65 Timer<MainThreadTaskRunner> m_pendingTasksTimer;
66 Vector<OwnPtr<ExecutionContextTask> > m_pendingTasks;
67 bool m_suspended;
68 };
69
create(ExecutionContext * context)70 inline PassOwnPtr<MainThreadTaskRunner> MainThreadTaskRunner::create(ExecutionContext* context)
71 {
72 return adoptPtr(new MainThreadTaskRunner(context));
73 }
74
75 } // namespace
76
77 #endif
78