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/*
The oSIP library implements the Session Initiation Protocol (SIP -rfc3261-)
Copyright (C) 2001,2002,2003 Aymeric MOIZARD jack@atosc.org
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include <stdio.h>
#include <osip/port.h>
#include <osip/fifo.h>
/* always use this method to initiate fifo_t.
*/
void
fifo_init (fifo_t * ff)
{
#ifdef OSIP_MT
ff->qislocked = smutex_init ();
/*INIT SEMA TO BLOCK ON GET() WHEN QUEUE IS EMPTY */
ff->qisempty = ssem_init (0);
#endif
ff->queue = (list_t *) smalloc (sizeof (list_t));
list_init (ff->queue);
/* ff->nb_elt = 0; */
ff->etat = vide;
}
int
fifo_add (fifo_t * ff, void *el)
{
#ifdef OSIP_MT
smutex_lock (ff->qislocked);
#endif
if (ff->etat != plein)
{
/* ff->nb_elt++; */
list_add (ff->queue, el, -1); /* insert at end of queue */
}
else
{
OSIP_TRACE (osip_trace
(__FILE__, __LINE__, OSIP_WARNING, NULL,
"too much traffic in fifo.\n"));
#ifdef OSIP_MT
smutex_unlock (ff->qislocked);
#endif
return -1; /* stack is full */
}
/* if (ff->nb_elt >= MAX_LEN) */
if (list_size (ff->queue) >= MAX_LEN)
ff->etat = plein;
else
ff->etat = ok;
#ifdef OSIP_MT
ssem_post (ff->qisempty);
smutex_unlock (ff->qislocked);
#endif
return 0;
}
int
fifo_insert (fifo_t * ff, void *el)
{
#ifdef OSIP_MT
smutex_lock (ff->qislocked);
#endif
if (ff->etat != plein)
{
/* ff->nb_elt++; */
list_add (ff->queue, el, 0); /* insert at end of queue */
}
else
{
OSIP_TRACE (osip_trace
(__FILE__, __LINE__, OSIP_WARNING, NULL,
"too much traffic in fifo.\n"));
#ifdef OSIP_MT
smutex_unlock (ff->qislocked);
#endif
return -1; /* stack is full */
}
/* if (ff->nb_elt >= MAX_LEN) */
if (list_size (ff->queue) >= MAX_LEN)
ff->etat = plein;
else
ff->etat = ok;
#ifdef OSIP_MT
ssem_post (ff->qisempty);
smutex_unlock (ff->qislocked);
#endif
return 0;
}
int
fifo_size (fifo_t * ff)
{
int i;
#ifdef OSIP_MT
smutex_lock (ff->qislocked);
#endif
i = list_size (ff->queue);
#ifdef OSIP_MT
smutex_unlock (ff->qislocked);
#endif
return i;
}
#ifdef OSIP_MT
void *
fifo_get (fifo_t * ff)
{
void *el;
int i = ssem_wait (ff->qisempty);
if (i != 0)
return NULL;
smutex_lock (ff->qislocked);
if (ff->etat != vide)
{
el = list_get (ff->queue, 0);
list_remove (ff->queue, 0);
/* ff->nb_elt--; */
}
else
{
OSIP_TRACE (osip_trace
(__FILE__, __LINE__, OSIP_ERROR, NULL,
"no element in fifo.\n"));
smutex_unlock (ff->qislocked);
return 0; /* pile vide */
}
/* if (ff->nb_elt <= 0) */
if (list_size (ff->queue) <= 0)
ff->etat = vide;
else
ff->etat = ok;
smutex_unlock (ff->qislocked);
return el;
}
#endif
void *
fifo_tryget (fifo_t * ff)
{
void *el;
#ifdef OSIP_MT
if (0 != ssem_trywait (ff->qisempty))
{ /* no elements... */
return NULL;
}
smutex_lock (ff->qislocked);
#else
if (ff->etat == vide)
return NULL;
#endif
if (ff->etat != vide)
{
el = list_get (ff->queue, 0);
list_remove (ff->queue, 0);
/* ff->nb_elt--; */
}
#ifdef OSIP_MT
else
{ /* this case MUST never happen... */
OSIP_TRACE (osip_trace
(__FILE__, __LINE__, OSIP_INFO4, NULL,
"no element in fifo.\n"));
smutex_unlock (ff->qislocked);
return 0;
}
#endif
/* if (ff->nb_elt <= 0) */
if (list_size (ff->queue) <= 0)
ff->etat = vide;
else
ff->etat = ok;
#ifdef OSIP_MT
smutex_unlock (ff->qislocked);
#endif
return el;
}
void
fifo_free (fifo_t * ff)
{
if (ff == NULL)
return;
#ifdef OSIP_MT
smutex_destroy (ff->qislocked);
#ifndef __VXWORKS_OS__
sfree (ff->qislocked);
#endif
/* seems that pthread_mutex_destroy does not free space by itself */
ssem_destroy (ff->qisempty);
sfree (ff->qisempty);
#endif
sfree (ff->queue);
}
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