mirror of
https://github.com/outbackdingo/UltraGrid.git
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95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
/**
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* @file utils/message_queue.cpp
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* @author Martin Pulec <pulec@cesnet.cz>
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*/
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/*
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* Copyright (c) 2013 CESNET z.s.p.o.
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* 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, is permitted provided that the following conditions
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* are met:
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*
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* 1. 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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*
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* 2. 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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*
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* 3. Neither the name of CESNET nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "config_unix.h"
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#include "config_win32.h"
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#include "utils/lock_guard.h"
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#include "utils/message_queue.h"
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message_queue::message_queue(int max_len) :
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m_max_len(max_len)
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{
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pthread_mutex_init(&m_lock, NULL);
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pthread_cond_init(&m_queue_incremented, NULL);
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pthread_cond_init(&m_queue_decremented, NULL);
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}
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message_queue::~message_queue()
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{
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pthread_mutex_destroy(&m_lock);
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pthread_cond_destroy(&m_queue_incremented);
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pthread_cond_destroy(&m_queue_decremented);
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}
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int message_queue::size()
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{
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lock_guard guard(m_lock);
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return m_queue.size();
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}
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void message_queue::push(msg *message)
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{
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lock_guard guard(m_lock);
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if (m_max_len != -1) {
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while (m_queue.size() >= (unsigned int) m_max_len) {
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pthread_cond_wait(&m_queue_decremented, &m_lock);
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}
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}
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m_queue.push(message);
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pthread_cond_signal(&m_queue_incremented);
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}
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msg *message_queue::pop(bool nonblocking)
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{
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lock_guard guard(m_lock);
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if (m_queue.size() == 0 && nonblocking) {
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return NULL;
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}
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while (m_queue.size() == 0) {
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pthread_cond_wait(&m_queue_incremented, &m_lock);
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}
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msg *ret = m_queue.front();
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m_queue.pop();
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pthread_cond_signal(&m_queue_decremented);
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return ret;
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}
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