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	1	/*
	2	* Copyright (C) 2013 Apple 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
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
	14	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	15	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	16	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
	17	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	18	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	19	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	20	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	21	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	23	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
	26	#ifndef Watchdog_h
	27	#define Watchdog_h
	28
	29	#if OS(DARWIN)
	30	#include <dispatch/dispatch.h>
	31	#endif
	32
	33	namespace JSC {
	34
	35	class ExecState;
	36	class VM;
	37
	38	class Watchdog {
	39	public:
	40	class Scope;
	41
	42	Watchdog();
	43	~Watchdog();
	44
	45	typedef bool (ShouldTerminateCallback)(ExecState, void* data1, void* data2);
	46	void setTimeLimit(VM&, double seconds, ShouldTerminateCallback = 0, void* data1 = 0, void* data2 = 0);
	47
	48	// This version of didFire() will check the elapsed CPU time and call the
	49	// callback (if needed) to determine if the watchdog should fire.
	50	bool didFire(ExecState*);
	51
	52	bool isEnabled();
	53
	54	// This version of didFire() is a more efficient version for when we want
	55	// to know if the watchdog has fired in the past, and not whether it should
	56	// fire right now.
	57	bool didFire() { return m_didFire; }
	58	JS_EXPORT_PRIVATE void fire();
	59
	60	void* timerDidFireAddress() { return &m_timerDidFire; }
	61
	62	private:
	63	void arm();
	64	void disarm();
	65	void startCountdownIfNeeded();
	66	void startCountdown(double limit);
	67	void stopCountdown();
	68	bool isArmed() { return !!m_reentryCount; }
	69
	70	// Platform specific timer implementation:
	71	void initTimer();
	72	void destroyTimer();
	73	void startTimer(double limit);
	74	void stopTimer();
	75
	76	// m_timerDidFire (above) indicates whether the timer fired. The Watchdog
	77	// still needs to check if the allowed CPU time has elapsed. If so, then
	78	// the Watchdog fires and m_didFire will be set.
	79	// NOTE: m_timerDidFire is only set by the platform specific timer
	80	// (probably from another thread) but is only cleared in the script thread.
	81	bool m_timerDidFire;
	82	bool m_didFire;
	83
	84	// All time units are in seconds.
	85	double m_limit;
	86	double m_startTime;
	87	double m_elapsedTime;
	88
	89	int m_reentryCount;
	90	bool m_isStopped;
	91
	92	ShouldTerminateCallback m_callback;
	93	void* m_callbackData1;
	94	void* m_callbackData2;
	95
	96	#if OS(DARWIN) && !PLATFORM(EFL) && !PLATFORM(GTK)
	97	dispatch_queue_t m_queue;
	98	dispatch_source_t m_timer;
	99	#endif
	100
	101	friend class Watchdog::Scope;
	102	friend class LLIntOffsetsExtractor;
	103	};
	104
	105	class Watchdog::Scope {
	106	public:
	107	Scope(Watchdog* watchdog)
	108	: m_watchdog(watchdog)
	109	{
	110	if (!watchdog)
	111	return;
	112	m_watchdog->arm();
	113	}
	114
	115	~Scope()
	116	{
	117	if (!m_watchdog)
	118	return;
	119	m_watchdog->disarm();
	120	}
	121
	122	private:
	123	Watchdog* m_watchdog;
	124	};
	125
	126	} // namespace JSC
	127
	128	#endif // Watchdog_h