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/* -*- c -*- */
/*
* Copyright 2007 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "gc_jd_queue.h"
#include "memory_barrier.h"
#include <mutex_init.h>
#include <mutex_lock.h>
#include <mutex_unlock.h>
void
gc_jd_queue_init(gc_jd_queue_t *q)
{
_mutex_init(ptr_to_ea(&q->mutex));
q->head = 0;
q->tail = 0;
smp_wmb();
}
void
gc_jd_queue_enqueue(gc_jd_queue_t *q, gc_job_desc_t *item)
{
item->sys.next = 0;
_mutex_lock(ptr_to_ea(&q->mutex));
smp_rmb(); // import barrier
if (q->tail == 0){ // currently empty
q->tail = q->head = jdp_to_ea(item);
}
else { // not empty, append
ea_to_jdp(q->tail)->sys.next = jdp_to_ea(item);
q->tail = jdp_to_ea(item);
}
smp_wmb(); // orders stores above before clearing of mutex
_mutex_unlock(ptr_to_ea(&q->mutex));
}
gc_job_desc_t *
gc_jd_queue_dequeue(gc_jd_queue_t *q)
{
_mutex_lock(ptr_to_ea(&q->mutex));
smp_rmb(); // import barrier
gc_eaddr_t item_ea = q->head;
if (item_ea == 0){ // empty
_mutex_unlock(ptr_to_ea(&q->mutex));
return 0;
}
q->head = ea_to_jdp(item_ea)->sys.next;
if (q->head == 0) // now emtpy
q->tail = 0;
gc_job_desc_t *item = ea_to_jdp(item_ea);
item->sys.next = 0;
smp_wmb(); // orders stores above before clearing of mutex
_mutex_unlock(ptr_to_ea(&q->mutex));
return item;
}
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