runtime/TimeoutChecker.h

   1 /*
   2  * Copyright (C) 2008 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  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  14  *     its contributors may be used to endorse or promote products derived
  15  *     from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #ifndef TimeoutChecker_h
  30 #define TimeoutChecker_h
  31
  32 #include <wtf/Assertions.h>
  33
  34 namespace JSC {
  35
  36     class ExecState;
  37
  38     class TimeoutChecker {
  39     public:
  40         TimeoutChecker();
  41
  42         void setTimeoutInterval(unsigned timeoutInterval) { m_timeoutInterval = timeoutInterval; }
  43         unsigned timeoutInterval() const { return m_timeoutInterval; }
  44
  45         unsigned ticksUntilNextCheck() { return m_ticksUntilNextCheck; }
  46
  47         void start()
  48         {
  49             if (!m_startCount)
  50                 reset();
  51             ++m_startCount;
  52         }
  53
  54         void stop()
  55         {
  56             ASSERT(m_startCount);
  57             --m_startCount;
  58         }
  59
  60         void reset();
  61
  62         bool didTimeOut(ExecState*);
  63
  64     private:
  65         unsigned m_timeoutInterval;
  66         unsigned m_timeAtLastCheck;
  67         unsigned m_timeExecuting;
  68         unsigned m_startCount;
  69         unsigned m_ticksUntilNextCheck;
  70     };
  71
  72 } // namespace JSC
  73
  74 #endif // TimeoutChecker_h