109 lines
3.0 KiB
C++
109 lines
3.0 KiB
C++
// ------------------------------------------------------------------------
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// object_queue.cpp: Thread-safe way to transmit generic objects (FIFO).
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// Copyright (C) 1999-2000 Kai Vehmanen
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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// ------------------------------------------------------------------------
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#ifndef INCLUDED_OBJECT_QUEUE_H
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#define INCLUDED_OBJECT_QUEUE_H
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#include <pthread.h>
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#include <deque>
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/**
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* Thread-safe way to transmit generic objects (FIFO-queue).
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*/
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template<class T>
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class OBJECT_QUEUE {
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private:
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deque<T> cmds_rep;
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mutable pthread_mutex_t lock_rep;
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public:
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/**
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* Inserts 'obj' into the queue. If some other process is
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* accessing the queue, this call will block.
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*/
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void push_back(const T& obj) {
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pthread_mutex_lock(&lock_rep);
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cmds_rep.push_back(obj);
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pthread_mutex_unlock(&lock_rep);
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}
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/**
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* Pops the first item. If some other process is
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* accessing the queue, this call will block.
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*/
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void pop_front(void) {
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pthread_mutex_lock(&lock_rep);
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cmds_rep.pop_front();
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pthread_mutex_unlock(&lock_rep);
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}
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/**
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* Returns the first item. If some other process is
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* accessing the queue, this call will block.
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*/
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T front(void) const {
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T temporary;
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pthread_mutex_lock(&lock_rep);
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if (cmds_rep.size() > 0) {
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temporary = cmds_rep.front();
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}
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pthread_mutex_unlock(&lock_rep);
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return(temporary);
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}
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/**
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* Returns true if the queue is empty. Unlike other calls,
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* this call will not block if some other process is
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* accessing the queue. In this case, the returned result
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* will be 'true' even if the queue wasn't empty.
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*/
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bool is_empty(void) const {
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if (pthread_mutex_trylock(&lock_rep) != 0)
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return(true);
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bool temp = true;
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if (cmds_rep.size() > 0) temp = false;
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pthread_mutex_unlock(&lock_rep);
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return(temp);
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}
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/**
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* Clears the queue. If some other process is
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* accessing the queue, this call will block.
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*/
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void clear(void) {
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pthread_mutex_lock(&lock_rep);
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while (cmds_repsize() > 0) cmds_rep.pop_front();
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pthread_mutex_unlock(&lock_rep);
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}
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OBJECT_QUEUE(void) {
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pthread_mutex_init(&lock_rep, NULL);
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}
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~OBJECT_QUEUE(void) {
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pthread_mutex_destroy(&lock_rep);
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}
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};
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#endif
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