2 * Copyright (C) 2014 Apple Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
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11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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26 #ifndef ProcessThrottler_h
27 #define ProcessThrottler_h
29 #include "ProcessAssertion.h"
31 #include <wtf/RunLoop.h>
32 #include <wtf/WeakPtr.h>
36 class WebProcessProxy;
38 class ProcessThrottler {
40 class ForegroundActivityToken {
42 ForegroundActivityToken(ProcessThrottler&);
43 ~ForegroundActivityToken();
46 WeakPtr<ProcessThrottler> m_throttler;
49 class BackgroundActivityToken {
51 BackgroundActivityToken(ProcessThrottler&);
52 ~BackgroundActivityToken();
55 WeakPtr<ProcessThrottler> m_throttler;
58 ProcessThrottler(WebProcessProxy*);
60 void didConnnectToProcess(pid_t);
61 void processReadyToSuspend();
62 void didCancelProcessSuspension();
65 friend class ForegroundActivityToken;
66 friend class BackgroundActivityToken;
67 WeakPtr<ProcessThrottler> weakPtr() { return m_weakPtrFactory.createWeakPtr(); }
69 AssertionState assertionState();
70 void updateAssertion();
71 void updateAssertionNow();
72 void suspendTimerFired();
74 WebProcessProxy* m_process;
75 WeakPtrFactory<ProcessThrottler> m_weakPtrFactory;
76 std::unique_ptr<ProcessAndUIAssertion> m_assertion;
77 RunLoop::Timer<ProcessThrottler> m_suspendTimer;
78 unsigned m_foregroundCount;
79 unsigned m_backgroundCount;
80 int m_suspendMessageCount;
85 #endif // ProcessThrottler_h