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Mutex.h
Go to the documentation of this file.
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/*
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* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef MUTEX_H
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#define MUTEX_H
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#include <pthread.h>
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#include "Error.h"
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namespace
ArgusSamples
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{
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class
ConditionVariable;
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/**
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* Mutex
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*/
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class
Mutex
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{
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public
:
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Mutex
();
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~Mutex
();
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/**
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* Create the underlying mutex. This method must be called before any other methods.
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*/
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bool
initialize
();
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/**
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* Destroy the underlying mutex. After this call, this object can no longer be used
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* (until and unless a future call to @c initialize()). Calling this method if the
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* object is not initialized generates no error, but silently returns.
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*/
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bool
shutdown
();
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/**
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* Lock the mutex. This method is declared @c const for convenience.
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*/
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bool
lock
()
const
;
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/**
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* Unlock the mutex. This method is declared @c const for convenience.
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*/
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bool
unlock
()
const
;
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private
:
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bool
m_initialized
;
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/**
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* pthread mutex, this is 'mutable' so that 'const' functions can be used.
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*/
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mutable
pthread_mutex_t
m_mutex
;
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/**
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* Hide copy constructor and assignment operator
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*/
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Mutex
(
Mutex
&other);
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const
Mutex
&
operator =
(
const
Mutex
&);
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friend
class
ConditionVariable
;
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pthread_mutex_t*
getPThreadMutex
()
const
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{
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return
&
m_mutex
;
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}
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};
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/**
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* An RAII-style class for acquiring a Mutex.
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* The mutex is acquired in the constructor and released in the destructor.
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* This class is NOT to be subclassed.
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*/
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class
ScopedMutex
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{
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public
:
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explicit
ScopedMutex
(
Mutex
& mutex)
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:
m_mutex
(&mutex)
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,
m_isLocked
(false)
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{
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m_isLocked
=
m_mutex
->
lock
();
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}
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~ScopedMutex
()
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{
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if
(
m_isLocked
)
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m_mutex
->
unlock
();
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}
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bool
expectLocked
()
const
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{
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if
(!
m_isLocked
)
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ORIGINATE_ERROR(
"Expected mutex to be locked"
);
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return
true
;
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}
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private
:
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Mutex
*
m_mutex
;
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bool
m_isLocked
;
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/**
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* Hide default/copy constructor and assignment operator
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*/
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ScopedMutex
();
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ScopedMutex
(
ScopedMutex
&other);
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ScopedMutex
&
operator =
(
const
ScopedMutex
&);
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};
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}
// namespace ArgusSamples
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#endif // MUTEX_H
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