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common
ConditionVariable.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 CAMERA_COMMON_CONDITION_VARIABLE_H
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#define CAMERA_COMMON_CONDITION_VARIABLE_H
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#include <pthread.h>
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namespace
ArgusSamples
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{
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class
Mutex;
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/**
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* Conditional
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*/
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class
ConditionVariable
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{
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public
:
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ConditionVariable
();
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~ConditionVariable
();
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/**
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* Create the underlying condition variable. This method must be called before any other
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* methods.
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*/
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bool
initialize
();
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/**
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* Destroy the underlying condition variable. 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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* Broadcast the condition variable. This method is declared @c const for convenience.
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*/
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bool
broadcast
()
const
;
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/**
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* Signal the condition variable. This method is declared @c const for convenience.
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*/
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bool
signal
()
const
;
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/**
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* Wait on the condition variable. This method is declared @c const for convenience.
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* @param [in] mutex The mutex that will be released while waiting. When multiple threads
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* are waiting concurrently, they must all be using the same mutex.
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*/
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bool
wait
(
const
Mutex
& mutex)
const
;
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private
:
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bool
m_initialized
;
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/**
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* pthread conditional variable, this is 'mutable' so that 'const' functions can be used.
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*/
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mutable
pthread_cond_t
m_cond
;
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/**
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* Hide copy constructor and assignment operator
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*/
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ConditionVariable
(
ConditionVariable
&other);
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const
ConditionVariable
&
operator =
(
const
ConditionVariable
&);
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};
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}
// namespace ArgusSamples
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#endif // CAMERA_COMMON_CONDITION_VARIABLE_H
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