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/*
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* This file is part of libbluray
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* Copyright (C) 2010-2016 Petri Hintukainen <phintuka@users.sourceforge.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "event_queue.h"
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#include "util/macro.h"
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#include "util/mutex.h"
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#include <string.h>
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#define MAX_EVENTS 31 /* 2^n - 1 */
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struct bd_event_queue {
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BD_MUTEX mutex;
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size_t event_size;
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unsigned in; /* next free slot */
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unsigned out; /* next event */
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unsigned char ev[1];
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};
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void event_queue_destroy(BD_EVENT_QUEUE **pp)
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{
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if (pp && *pp) {
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BD_EVENT_QUEUE *eq = *pp;
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bd_mutex_destroy(&eq->mutex);
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X_FREE(*pp);
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}
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}
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BD_EVENT_QUEUE *event_queue_new(size_t event_size)
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{
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BD_EVENT_QUEUE *eq = calloc(1, sizeof(BD_EVENT_QUEUE) + event_size * (MAX_EVENTS + 1));
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if (eq) {
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bd_mutex_init(&eq->mutex);
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eq->event_size = event_size;
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}
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return eq;
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}
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int event_queue_get(BD_EVENT_QUEUE *eq, void *ev)
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{
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int result = 0;
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if (eq) {
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bd_mutex_lock(&eq->mutex);
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if (eq->in != eq->out) {
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memcpy(ev, &eq->ev[eq->out * eq->event_size], eq->event_size);
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eq->out = (eq->out + 1) & MAX_EVENTS;
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result = 1;
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}
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bd_mutex_unlock(&eq->mutex);
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}
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return result;
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}
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int event_queue_put(BD_EVENT_QUEUE *eq, const void *ev)
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{
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int result = 0;
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if (eq) {
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bd_mutex_lock(&eq->mutex);
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unsigned new_in = (eq->in + 1) & MAX_EVENTS;
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if (new_in != eq->out) {
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memcpy(&eq->ev[eq->in * eq->event_size], ev, eq->event_size);
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eq->in = new_in;
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result = 1;
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}
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bd_mutex_unlock(&eq->mutex);
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}
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return result;
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}
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