2 * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
3 * Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
15 * its contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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31 #include "TimeoutChecker.h"
33 #include "CallFrame.h"
34 #include "JSGlobalObject.h"
37 #include <mach/mach.h>
41 #include "CurrentTime.h"
48 // Number of ticks before the first timeout check is done.
49 static const int ticksUntilFirstCheck = 1024;
51 // Number of milliseconds between each timeout check.
52 static const int intervalBetweenChecks = 1000;
54 // Returns the time the current thread has spent executing, in milliseconds.
55 static inline unsigned getCPUTime()
58 mach_msg_type_number_t infoCount = THREAD_BASIC_INFO_COUNT;
59 thread_basic_info_data_t info;
61 // Get thread information
62 mach_port_t threadPort = mach_thread_self();
63 thread_info(threadPort, THREAD_BASIC_INFO, reinterpret_cast<thread_info_t>(&info), &infoCount);
64 mach_port_deallocate(mach_task_self(), threadPort);
66 unsigned time = info.user_time.seconds * 1000 + info.user_time.microseconds / 1000;
67 time += info.system_time.seconds * 1000 + info.system_time.microseconds / 1000;
73 unsigned long long fileTimeAsLong;
74 } userTime, kernelTime;
76 // GetThreadTimes won't accept NULL arguments so we pass these even though
78 FILETIME creationTime, exitTime;
80 GetThreadTimes(GetCurrentThread(), &creationTime, &exitTime, &kernelTime.fileTime, &userTime.fileTime);
82 return userTime.fileTimeAsLong / 10000 + kernelTime.fileTimeAsLong / 10000;
84 // FIXME: We should return the time the current thread has spent executing.
86 // use a relative time from first call in order to avoid an overflow
87 static double firstTime = currentTime();
88 return static_cast<unsigned> ((currentTime() - firstTime) * 1000);
92 TimeoutChecker::TimeoutChecker()
93 : m_timeoutInterval(0)
99 void TimeoutChecker::reset()
101 m_ticksUntilNextCheck = ticksUntilFirstCheck;
102 m_timeAtLastCheck = 0;
106 bool TimeoutChecker::didTimeOut(ExecState* exec)
108 unsigned currentTime = getCPUTime();
110 if (!m_timeAtLastCheck) {
111 // Suspicious amount of looping in a script -- start timing it
112 m_timeAtLastCheck = currentTime;
116 unsigned timeDiff = currentTime - m_timeAtLastCheck;
121 m_timeExecuting += timeDiff;
122 m_timeAtLastCheck = currentTime;
124 // Adjust the tick threshold so we get the next checkTimeout call in the
125 // interval specified in intervalBetweenChecks.
126 m_ticksUntilNextCheck = static_cast<unsigned>((static_cast<float>(intervalBetweenChecks) / timeDiff) * m_ticksUntilNextCheck);
127 // If the new threshold is 0 reset it to the default threshold. This can happen if the timeDiff is higher than the
128 // preferred script check time interval.
129 if (m_ticksUntilNextCheck == 0)
130 m_ticksUntilNextCheck = ticksUntilFirstCheck;
132 if (m_timeoutInterval && m_timeExecuting > m_timeoutInterval) {
133 if (exec->dynamicGlobalObject()->globalObjectMethodTable()->shouldInterruptScript(exec->dynamicGlobalObject()))