Home | History | Annotate | Download | only in runtime 
      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
     75