| /* |
| wqueue.h |
| Worker thread queue based on the Standard C++ library list |
| template class. |
| ------------------------------------------ |
| Copyright (c) 2013 Vic Hargrave |
| Licensed 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 |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| // https://vichargrave.github.io/articles/2013-01/multithreaded-work-queue-in-cpp |
| // https://github.com/vichargrave/wqueue/blob/master/wqueue.h |
| |
| |
| #ifndef __wqueue_h__ |
| #define __wqueue_h__ |
| |
| #include <pthread.h> |
| #include <list> |
| |
| using namespace std; |
| |
| template <typename T> class wqueue |
| { |
| list<T> m_queue; |
| pthread_mutex_t m_mutex; |
| pthread_cond_t m_condv; |
| |
| public: |
| wqueue() |
| { |
| pthread_mutexattr_t attr; |
| pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); |
| pthread_mutex_init(&m_mutex, &attr); |
| pthread_cond_init(&m_condv, NULL); |
| } |
| |
| ~wqueue() { |
| pthread_mutex_destroy(&m_mutex); |
| pthread_cond_destroy(&m_condv); |
| } |
| |
| void put(T item) { |
| pthread_mutex_lock(&m_mutex); |
| m_queue.push_back(item); |
| pthread_cond_signal(&m_condv); |
| pthread_mutex_unlock(&m_mutex); |
| } |
| |
| T get() { |
| pthread_mutex_lock(&m_mutex); |
| while (m_queue.size() == 0) { |
| pthread_cond_wait(&m_condv, &m_mutex); |
| } |
| T item = m_queue.front(); |
| m_queue.pop_front(); |
| pthread_mutex_unlock(&m_mutex); |
| return item; |
| } |
| |
| int size() { |
| pthread_mutex_lock(&m_mutex); |
| int size = m_queue.size(); |
| pthread_mutex_unlock(&m_mutex); |
| return size; |
| } |
| }; |
| |
| #endif |