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/*
* ConditionalWait.h, part of VCMI engine
*
* Authors: listed in file AUTHORS in main folder
*
* License: GNU General Public License v2.0 or later
* Full text of license available in license.txt file, in main folder
*
*/
#pragma once
#include <condition_variable>
VCMI_LIB_NAMESPACE_BEGIN
class TerminationRequestedException : public std::exception
{
public:
using exception::exception;
const char* what() const noexcept override
{
return "Thread termination requested";
}
};
class ConditionalWait
{
bool isBusyValue = false;
bool isTerminating = false;
std::condition_variable cond;
std::mutex mx;
void set(bool value)
{
std::unique_lock lock(mx);
isBusyValue = value;
}
public:
ConditionalWait() = default;
void setBusy()
{
set(true);
}
void setFree()
{
set(false);
cond.notify_all();
}
void requestTermination()
{
isTerminating = true;
setFree();
}
bool isBusy()
{
std::unique_lock lock(mx);
return isBusyValue;
}
void waitWhileBusy()
{
std::unique_lock un(mx);
cond.wait(un, [this](){ return !isBusyValue;});
if (isTerminating)
throw TerminationRequestedException();
}
};
VCMI_LIB_NAMESPACE_END
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