160 lines
4.3 KiB
C++
160 lines
4.3 KiB
C++
/*
|
|
* This file is a part of TTCalc - a mathematical calculator
|
|
* and is distributed under the (new) BSD licence.
|
|
* Author: Tomasz Sowa <t.sowa@slimaczek.pl>
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 2006-2008, Tomasz Sowa
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
*
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* * Neither the name Tomasz Sowa nor the names of contributors to this
|
|
* project may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
|
|
* THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef headerfilestopcalculating
|
|
#define headerfilestopcalculating
|
|
|
|
/*!
|
|
\file stopcalculating.h
|
|
\brief it tells us whether there was a stop signal or not
|
|
*/
|
|
|
|
#include <ttmath/ttmathtypes.h>
|
|
#include <windows.h>
|
|
|
|
|
|
/*!
|
|
\brief it tells us whether there was a stop signal or not
|
|
|
|
we can pass a pointer to the object of this class to the certain
|
|
calculating methods especially for the method which calculates the
|
|
Factorial (1*2*3*4....), such methods as the Factorial takes a lot of time
|
|
and sometimes we want to break the calculations for example when we've got
|
|
a new input string
|
|
|
|
those methods which take a lot of time check the object of type NewStopCalculating
|
|
and if there was a stop signal they stop and return immediately without returning
|
|
a correct result
|
|
|
|
the stop signal can be caused by another thread in our case by the first (gui) thread
|
|
|
|
there'll be only one object of this class
|
|
(it'll be as an variable of ThreadController class)
|
|
*/
|
|
class NewStopCalculating : public ttmath::StopCalculating
|
|
{
|
|
public:
|
|
|
|
|
|
/*!
|
|
the constructor
|
|
*/
|
|
NewStopCalculating()
|
|
{
|
|
stop = 0;
|
|
}
|
|
|
|
|
|
/*!
|
|
the destructor
|
|
*/
|
|
~NewStopCalculating()
|
|
{
|
|
if(stop) CloseHandle(stop);
|
|
}
|
|
|
|
|
|
/*!
|
|
it initializes an object of this class
|
|
|
|
this method will be called from Init() of the ThreadController object
|
|
*/
|
|
bool Init() volatile
|
|
{
|
|
char buffer[80];
|
|
|
|
// with 'GetTickCount()' we're generating an unique identifier of our event
|
|
// (there can be another window of ttcalc)
|
|
sprintf(buffer,"TTCalcStopEventForStoppingCalculations7756%u",
|
|
(unsigned int)GetTickCount());
|
|
|
|
// 'stop' will be manual-reseted and initialized as non-signaled
|
|
if( (stop = CreateEvent(0,true,false,buffer))==NULL)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/*!
|
|
when we want to stop the calculations for example when the user changed somewhat
|
|
we call the Stop() method from the first (gui) thread
|
|
*/
|
|
void Stop() volatile
|
|
{
|
|
SetEvent(stop);
|
|
}
|
|
|
|
|
|
/*!
|
|
when we start the calculations we call this method
|
|
|
|
(we call it from WaitForCalculatingAndBlockForStop() method of
|
|
ThreadController class)
|
|
*/
|
|
void Start() volatile
|
|
{
|
|
ResetEvent(stop);
|
|
}
|
|
|
|
|
|
/*!
|
|
it returns 'true' if there was a stop signal
|
|
|
|
it's useful for the second thread and functions which take plenty of time
|
|
for calculating, when this method returns 'true' those methods break the
|
|
calculations and return without returning a correct value
|
|
*/
|
|
virtual bool WasStopSignal() const volatile
|
|
{
|
|
if( WaitForSingleObject(stop,0) == WAIT_OBJECT_0 )
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
private:
|
|
|
|
// manual-reset, initialized as non-signaled
|
|
HANDLE stop;
|
|
|
|
};
|
|
|
|
|
|
#endif
|