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/********************************************************************************
* *
* C o n d i t i o n C l a s s *
* *
*********************************************************************************
* Copyright (C) 2004,2022 by Jeroen van der Zijp. All Rights Reserved. *
*********************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/> *
********************************************************************************/
#ifndef FXCONDITION_H
#define FXCONDITION_H
namespace FX {
/**
* A condition allows one or more threads to synchronize
* to an event. When a thread calls wait, the associated
* mutex is unlocked while the thread is blocked. When the
* condition becomes signaled, the associated mutex is
* locked and the thread(s) are reawakened.
*/
class FXAPI FXCondition {
private:
FXuval data[12];
private:
FXCondition(const FXCondition&);
FXCondition& operator=(const FXCondition&);
public:
/// Initialize the condition
FXCondition();
/**
* Wake or unblock a single blocked thread
*/
void signal();
/**
* Wake or unblock all blocked threads
*/
void broadcast();
/**
* Wait until condition becomes signalled, using given mutex,
* which must already have been locked prior to this call.
* Return true if the wait ended due to the condition being
* signalled through signal() or broadcast(), and false if the
* wait was interrupted or some error occurred.
*/
FXbool wait(FXMutex& mtx);
FXbool wait(FXScopedMutex& smx){ return wait(smx.mutex()); }
FXbool wait(FXReverseMutex& rmx){ return wait(rmx.mutex()); }
/**
* Wait until condition becomes signalled, using given mutex,
* which must already have been locked prior to this call.
* Return true if the wait ended due to the condition being
* signalled through signal() or broadcast(), and false if the
* wait timed out, was interrupted, or some other error occurred.
* The relative timeout nsec is specified in nanoseconds; if the
* special value 'forever' is passed, wait indefinitely.
*/
FXbool wait(FXMutex& mtx,FXTime nsec);
FXbool wait(FXScopedMutex& smx,FXTime nsec){ return wait(smx.mutex(),nsec); }
FXbool wait(FXReverseMutex& rmx,FXTime nsec){ return wait(rmx.mutex(),nsec); }
/// Delete the condition
~FXCondition();
};
}
#endif
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