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/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef Watchdog_h
#define Watchdog_h
#if OS(DARWIN)
#include <dispatch/dispatch.h>
#endif
namespace JSC {
class ExecState;
class VM;
class Watchdog {
public:
class Scope;
Watchdog();
~Watchdog();
typedef bool (*ShouldTerminateCallback)(ExecState*, void* data1, void* data2);
void setTimeLimit(VM&, double seconds, ShouldTerminateCallback = 0, void* data1 = 0, void* data2 = 0);
// This version of didFire() will check the elapsed CPU time and call the
// callback (if needed) to determine if the watchdog should fire.
bool didFire(ExecState*);
bool isEnabled();
// This version of didFire() is a more efficient version for when we want
// to know if the watchdog has fired in the past, and not whether it should
// fire right now.
bool didFire() { return m_didFire; }
JS_EXPORT_PRIVATE void fire();
void* timerDidFireAddress() { return &m_timerDidFire; }
private:
void arm();
void disarm();
void startCountdownIfNeeded();
void startCountdown(double limit);
void stopCountdown();
bool isArmed() { return !!m_reentryCount; }
// Platform specific timer implementation:
void initTimer();
void destroyTimer();
void startTimer(double limit);
void stopTimer();
// m_timerDidFire (above) indicates whether the timer fired. The Watchdog
// still needs to check if the allowed CPU time has elapsed. If so, then
// the Watchdog fires and m_didFire will be set.
// NOTE: m_timerDidFire is only set by the platform specific timer
// (probably from another thread) but is only cleared in the script thread.
bool m_timerDidFire;
bool m_didFire;
// All time units are in seconds.
double m_limit;
double m_startTime;
double m_elapsedTime;
int m_reentryCount;
bool m_isStopped;
ShouldTerminateCallback m_callback;
void* m_callbackData1;
void* m_callbackData2;
#if OS(DARWIN) && !PLATFORM(EFL) && !PLATFORM(GTK)
dispatch_queue_t m_queue;
dispatch_source_t m_timer;
#endif
friend class Watchdog::Scope;
friend class LLIntOffsetsExtractor;
};
class Watchdog::Scope {
public:
Scope(Watchdog* watchdog)
: m_watchdog(watchdog)
{
if (!watchdog)
return;
m_watchdog->arm();
}
~Scope()
{
if (!m_watchdog)
return;
m_watchdog->disarm();
}
private:
Watchdog* m_watchdog;
};
} // namespace JSC
#endif // Watchdog_h
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