/*
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wqueue.h
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Worker thread queue based on the Standard C++ library list
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template class.
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------------------------------------------
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Copyright (c) 2013 Vic Hargrave
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// https://vichargrave.github.io/articles/2013-01/multithreaded-work-queue-in-cpp
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// https://github.com/vichargrave/wqueue/blob/master/wqueue.h
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#ifndef __wqueue_h__
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#define __wqueue_h__
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#include <pthread.h>
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#include <list>
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using namespace std;
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template <typename T> class wqueue
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{
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list<T> m_queue;
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pthread_mutex_t m_mutex;
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pthread_mutexattr_t m_mutex_attr;
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pthread_cond_t m_condv;
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public:
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wqueue()
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{
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pthread_mutexattr_init(&m_mutex_attr);
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pthread_mutexattr_settype(&m_mutex_attr, PTHREAD_MUTEX_RECURSIVE);
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pthread_mutex_init(&m_mutex, &m_mutex_attr);
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pthread_cond_init(&m_condv, NULL);
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}
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~wqueue() {
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pthread_mutex_destroy(&m_mutex);
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pthread_cond_destroy(&m_condv);
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}
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void put(T item) {
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pthread_mutex_lock(&m_mutex);
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m_queue.push_back(item);
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pthread_cond_signal(&m_condv);
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pthread_mutex_unlock(&m_mutex);
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}
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T get(uint32_t tmo) {
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pthread_mutex_lock(&m_mutex);
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if (tmo) {
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while (m_queue.size() == 0) {
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pthread_cond_wait(&m_condv, &m_mutex);
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}
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}
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T item = NULL;
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if (m_queue.size() != 0) {
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item = m_queue.front();
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m_queue.pop_front();
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}
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pthread_mutex_unlock(&m_mutex);
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return item;
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}
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void remove(T item) {
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pthread_mutex_lock(&m_mutex);
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m_queue.remove(item);
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pthread_mutex_unlock(&m_mutex);
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}
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int size() {
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pthread_mutex_lock(&m_mutex);
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int size = m_queue.size();
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pthread_mutex_unlock(&m_mutex);
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return size;
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}
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};
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#endif
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