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/*
* barrier -- mouse and keyboard sharing utility
* Copyright (C) 2012-2016 Symless Ltd.
* Copyright (C) 2002 Chris Schoeneman
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* found in the file LICENSE that should have accompanied this file.
*
* This package 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "arch/IArchMultithread.h"
//! Mutual exclusion
/*!
A non-recursive mutual exclusion object. Only one thread at a time can
hold a lock on a mutex. Any thread that attempts to lock a locked mutex
will block until the mutex is unlocked. At that time, if any threads are
blocked, exactly one waiting thread will acquire the lock and continue
running. A thread may not lock a mutex it already owns the lock on; if
it tries it will deadlock itself.
*/
class Mutex {
public:
Mutex();
//! Equivalent to default c'tor
/*!
Copy c'tor doesn't copy anything. It just makes it possible to
copy objects that contain a mutex.
*/
Mutex(const Mutex&);
~Mutex();
//! @name manipulators
//@{
//! Does nothing
/*!
This does nothing. It just makes it possible to assign objects
that contain a mutex.
*/
Mutex& operator=(const Mutex&);
//@}
//! @name accessors
//@{
//! Lock the mutex
/*!
Locks the mutex, which must not have been previously locked by the
calling thread. This blocks if the mutex is already locked by another
thread.
(cancellation point)
*/
void lock() const;
//! Unlock the mutex
/*!
Unlocks the mutex, which must have been previously locked by the
calling thread.
*/
void unlock() const;
//@}
private:
friend class CondVarBase;
ArchMutex m_mutex;
};
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