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