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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_OSL_CONDITN_HXX
#define INCLUDED_OSL_CONDITN_HXX
#ifdef __cplusplus
#include <osl/time.h>
#include <osl/conditn.h>
namespace osl
{
/**
* Warning: the Condition abstraction is inadequate for any
* situation where there may be multiple threads setting,
* waiting, and resetting the same condition. It can only be
* used to synchronise interactions between two threads
* cf. lost wakeups in:
* http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
*/
class Condition
{
public:
enum Result
{
result_ok = osl_cond_result_ok,
result_error = osl_cond_result_error,
result_timeout = osl_cond_result_timeout
};
/* Create a condition.
*/
Condition()
{
condition = osl_createCondition();
}
/* Release the OS-structures and free condition data-structure.
*/
~Condition()
{
osl_destroyCondition(condition);
}
/* Release all waiting threads, check returns true.
*/
void set()
{
osl_setCondition(condition);
}
/* Reset condition to false: wait() will block, check() returns false.
*/
void reset() {
osl_resetCondition(condition);
}
/** Blocks the calling thread until condition is set.
*/
Result wait(const TimeValue *pTimeout = 0)
{
return (Result) osl_waitCondition(condition, pTimeout);
}
/** Checks if the condition is set without blocking.
*/
bool check()
{
return osl_checkCondition(condition);
}
private:
oslCondition condition;
/** The underlying oslCondition has no reference count.
Since the underlying oslCondition is not a reference counted object, copy
constructed Condition may work on an already destructed oslCondition object.
*/
Condition(const Condition&);
/** The underlying oslCondition has no reference count.
When destructed, the Condition object destroys the undelying oslCondition,
which might cause severe problems in case it's a temporary object.
*/
Condition(oslCondition condition);
/** This assignment operator is private for the same reason as
the copy constructor.
*/
Condition& operator= (const Condition&);
/** This assignment operator is private for the same reason as
the constructor taking a oslCondition argument.
*/
Condition& operator= (oslCondition);
};
}
#endif /* __cplusplus */
#endif // INCLUDED_OSL_CONDITN_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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