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/*
The oRTP library is an RTP (Realtime Transport Protocol - rfc1889) stack.
Copyright (C) 2001 Simon MORLAT simon.morlat@linphone.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
*/
#ifndef _WIN32 /* do not include ortp-config.h when we are on win32 */
#include <rtpport.h>
#include <sched.h>
#include <unistd.h>
#include <errno.h>
#else
#include "ortp-config-win32.h"
#endif
#include "scheduler.h"
// To avoid warning during compile
extern void rtp_session_process (RtpSession * session, guint32 time, RtpScheduler *sched);
void rtp_scheduler_init(RtpScheduler *sched)
{
sched->list=0;
sched->time_=0;
/* default to the posix timer */
rtp_scheduler_set_timer(sched,&posix_timer);
sched->lock=g_mutex_new();
//sched->unblock_select_mutex=g_mutex_new();
sched->unblock_select_cond=g_cond_new();
sched->max_sessions=sizeof(SessionSet)*8;
session_set_init(&sched->all_sessions);
sched->all_max=0;
session_set_init(&sched->r_sessions);
sched->r_max=0;
session_set_init(&sched->w_sessions);
sched->w_max=0;
session_set_init(&sched->e_sessions);
sched->e_max=0;
}
RtpScheduler * rtp_scheduler_new()
{
RtpScheduler *sched=g_malloc(sizeof(RtpScheduler));
memset(sched,0,sizeof(RtpScheduler));
rtp_scheduler_init(sched);
return sched;
}
void rtp_scheduler_set_timer(RtpScheduler *sched,RtpTimer *timer)
{
if (sched->thread_running){
g_warning("Cannot change timer while the scheduler is running !!");
return;
}
sched->timer=timer;
/* report the timer increment */
sched->timer_inc=(timer->interval.tv_usec/1000) + (timer->interval.tv_sec*1000);
}
void rtp_scheduler_start(RtpScheduler *sched)
{
if (sched->thread_running==0){
sched->thread_running=1;
g_mutex_lock(sched->lock);
sched->thread=g_thread_create((GThreadFunc)rtp_scheduler_schedule,(gpointer)sched,TRUE,NULL);
g_cond_wait(sched->unblock_select_cond,sched->lock);
g_mutex_unlock(sched->lock);
}
else g_warning("Scheduler thread already running.");
}
void rtp_scheduler_stop(RtpScheduler *sched)
{
if (sched->thread_running==1)
{
sched->thread_running=0;
g_thread_join(sched->thread);
}
else g_warning("Scheduler thread is not running.");
}
void rtp_scheduler_destroy(RtpScheduler *sched)
{
if (sched->thread_running) rtp_scheduler_stop(sched);
g_mutex_free(sched->lock);
//g_mutex_free(sched->unblock_select_mutex);
g_cond_free(sched->unblock_select_cond);
g_free(sched);
}
gpointer rtp_scheduler_schedule(gpointer psched)
{
RtpScheduler *sched=(RtpScheduler*) psched;
RtpTimer *timer=sched->timer;
RtpSession *current;
int err;
/* try to get the real time priority by getting root*/
#ifndef _WIN32
#ifdef HAVE_SETEUID
err=seteuid(0);
#else
err=setuid(0);
#endif
if (err<0) g_message("Could not get root euid: %s",strerror(errno));
#endif
g_message("scheduler: trying to reach real time kernel scheduling...");
/* take this lock to prevent the thread to start until g_thread_create() returns
because we need sched->thread to be initialized */
g_mutex_lock(sched->lock);
g_cond_signal(sched->unblock_select_cond); /* unblock the starting thread */
g_mutex_unlock(sched->lock);
g_thread_set_priority(sched->thread,G_THREAD_PRIORITY_HIGH);
timer->timer_init();
while(sched->thread_running)
{
/* do the processing here: */
g_mutex_lock(sched->lock);
current=sched->list;
/* processing all scheduled rtp sessions */
while (current!=NULL)
{
ortp_debug("scheduler: processing session=%p.\n",current);
rtp_session_process(current,sched->time_,sched);
current=current->next;
}
/* wake up all the threads that are sleeping in _select() */
g_cond_broadcast(sched->unblock_select_cond);
g_mutex_unlock(sched->lock);
/* now while the scheduler is going to sleep, the other threads can compute their
result tqmask and see if they have to leave, or to wait for next tick*/
//g_message("scheduler: sleeping.");
timer->timer_do();
sched->time_+=sched->timer_inc;
}
/* when leaving the thread, stop the timer */
timer->timer_uninit();
return NULL;
}
void rtp_scheduler_add_session(RtpScheduler *sched, RtpSession *session)
{
RtpSession *oldfirst;
int i;
if (session->flags & RTP_SESSION_IN_SCHEDULER){
/* the rtp session is already scheduled, so return silently */
return;
}
rtp_scheduler_lock(sched);
/* enqueue the session to the list of scheduled sessions */
oldfirst=sched->list;
sched->list=session;
session->next=oldfirst;
if (sched->max_sessions==0){
g_error("rtp_scheduler_add_session: max_session=0 !");
}
/* find a free pos in the session tqmask*/
for (i=0;i<sched->max_sessions;i++){
if (!ORTP_FD_ISSET(i,&sched->all_sessions.rtpset)){
session->tqmask_pos=i;
session_set_set(&sched->all_sessions,session);
/* make a new session scheduled not blockable if it has not started*/
if (session->flags & RTP_SESSION_RECV_NOT_STARTED)
session_set_set(&sched->r_sessions,session);
if (session->flags & RTP_SESSION_SEND_NOT_STARTED)
session_set_set(&sched->w_sessions,session);
if (i>sched->all_max){
sched->all_max=i;
}
break;
}
}
rtp_session_set_flag(session,RTP_SESSION_IN_SCHEDULER);
rtp_scheduler_unlock(sched);
}
void rtp_scheduler_remove_session(RtpScheduler *sched, RtpSession *session)
{
RtpSession *tmp;
int cond=1;
g_return_if_fail(session!=NULL);
if (!(session->flags & RTP_SESSION_IN_SCHEDULER)){
/* the rtp session is not scheduled, so return silently */
return;
}
rtp_scheduler_lock(sched);
tmp=sched->list;
if (tmp==session){
sched->list=tmp->next;
rtp_session_unset_flag(session,RTP_SESSION_IN_SCHEDULER);
session_set_clr(&sched->all_sessions,session);
rtp_scheduler_unlock(sched);
return;
}
/* go the position of session in the list */
while(cond){
if (tmp!=NULL){
if (tmp->next==session){
tmp->next=tmp->next->next;
cond=0;
}
else tmp=tmp->next;
}else {
/* the session was not found ! */
g_warning("rtp_scheduler_remove_session: the session was not found in the scheduler list!");
cond=0;
}
}
rtp_session_unset_flag(session,RTP_SESSION_IN_SCHEDULER);
/* delete the bit in the tqmask */
session_set_clr(&sched->all_sessions,session);
rtp_scheduler_unlock(sched);
}
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