runtime/TimeoutChecker.cpp

   1 /*
   2  * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
   3  * Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   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.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include "config.h"
  31 #include "TimeoutChecker.h"
  32
  33 #include "CallFrame.h"
  34 #include "JSGlobalObject.h"
  35
  36 #if PLATFORM(DARWIN)
  37 #include <mach/mach.h>
  38 #endif
  39
  40 #if HAVE(SYS_TIME_H)
  41 #include <sys/time.h>
  42 #endif
  43
  44 #if PLATFORM(WIN_OS)
  45 #include <windows.h>
  46 #endif
  47
  48 #if PLATFORM(QT)
  49 #include <QDateTime>
  50 #endif
  51
  52 using namespace std;
  53
  54 namespace JSC {
  55
  56 // Number of ticks before the first timeout check is done.
  57 static const int ticksUntilFirstCheck = 1024;
  58
  59 // Number of milliseconds between each timeout check.
  60 static const int intervalBetweenChecks = 1000;
  61
  62 // Returns the time the current thread has spent executing, in milliseconds.
  63 static inline unsigned getCPUTime()
  64 {
  65 #if PLATFORM(DARWIN)
  66     mach_msg_type_number_t infoCount = THREAD_BASIC_INFO_COUNT;
  67     thread_basic_info_data_t info;
  68
  69     // Get thread information
  70     mach_port_t threadPort = mach_thread_self();
  71     thread_info(threadPort, THREAD_BASIC_INFO, reinterpret_cast<thread_info_t>(&info), &infoCount);
  72     mach_port_deallocate(mach_task_self(), threadPort);
  73
  74     unsigned time = info.user_time.seconds * 1000 + info.user_time.microseconds / 1000;
  75     time += info.system_time.seconds * 1000 + info.system_time.microseconds / 1000;
  76
  77     return time;
  78 #elif HAVE(SYS_TIME_H)
  79     // FIXME: This should probably use getrusage with the RUSAGE_THREAD flag.
  80     struct timeval tv;
  81     gettimeofday(&tv, 0);
  82     return tv.tv_sec * 1000 + tv.tv_usec / 1000;
  83 #elif PLATFORM(QT)
  84     QDateTime t = QDateTime::currentDateTime();
  85     return t.toTime_t() * 1000 + t.time().msec();
  86 #elif PLATFORM(WIN_OS)
  87     union {
  88         FILETIME fileTime;
  89         unsigned long long fileTimeAsLong;
  90     } userTime, kernelTime;
  91
  92     // GetThreadTimes won't accept NULL arguments so we pass these even though
  93     // they're not used.
  94     FILETIME creationTime, exitTime;
  95
  96     GetThreadTimes(GetCurrentThread(), &creationTime, &exitTime, &kernelTime.fileTime, &userTime.fileTime);
  97
  98     return userTime.fileTimeAsLong / 10000 + kernelTime.fileTimeAsLong / 10000;
  99 #else
 100 #error Platform does not have getCurrentTime function
 101 #endif
 102 }
 103
 104 TimeoutChecker::TimeoutChecker()
 105     : m_timeoutInterval(0)
 106     , m_startCount(0)
 107 {
 108     reset();
 109 }
 110
 111 void TimeoutChecker::reset()
 112 {
 113     m_ticksUntilNextCheck = ticksUntilFirstCheck;
 114     m_timeAtLastCheck = 0;
 115     m_timeExecuting = 0;
 116 }
 117
 118 bool TimeoutChecker::didTimeOut(ExecState* exec)
 119 {
 120     unsigned currentTime = getCPUTime();
 121
 122     if (!m_timeAtLastCheck) {
 123         // Suspicious amount of looping in a script -- start timing it
 124         m_timeAtLastCheck = currentTime;
 125         return false;
 126     }
 127
 128     unsigned timeDiff = currentTime - m_timeAtLastCheck;
 129
 130     if (timeDiff == 0)
 131         timeDiff = 1;
 132
 133     m_timeExecuting += timeDiff;
 134     m_timeAtLastCheck = currentTime;
 135
 136     // Adjust the tick threshold so we get the next checkTimeout call in the
 137     // interval specified in intervalBetweenChecks.
 138     m_ticksUntilNextCheck = static_cast<unsigned>((static_cast<float>(intervalBetweenChecks) / timeDiff) * m_ticksUntilNextCheck);
 139     // If the new threshold is 0 reset it to the default threshold. This can happen if the timeDiff is higher than the
 140     // preferred script check time interval.
 141     if (m_ticksUntilNextCheck == 0)
 142         m_ticksUntilNextCheck = ticksUntilFirstCheck;
 143
 144     if (exec->dynamicGlobalObject()->shouldInterruptScriptBeforeTimeout())
 145         return true;
 146
 147     if (m_timeoutInterval && m_timeExecuting > m_timeoutInterval) {
 148         if (exec->dynamicGlobalObject()->shouldInterruptScript())
 149             return true;
 150
 151         reset();
 152     }
 153
 154     return false;
 155 }
 156
 157 } // namespace JSC