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ALSA backend (based on Dummy backend and zita-alsa-pcmi)

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This commit is contained in:
Robin Gareus 2014-06-02 14:29:19 +02:00
parent b517695256
commit 8e9b02cfa2
8 changed files with 3229 additions and 1 deletions
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56
libs/backends/alsa/rt_thread.h Normal file
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/*
* Copyright (C) 2014 Robin Gareus <robin@gareus.org>
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __libbackend_alsa_rthread_h__
#define __libbackend_alsa_rthread_h__
#include <pthread.h>
#include <sched.h>
static int
_realtime_pthread_create (
int policy, int priority,
pthread_t *thread,
void *(*start_routine) (void *),
void *arg)
{
int rv;
pthread_attr_t attr;
struct sched_param parm;
const size_t stacksize = 100000;
const int p_min = sched_get_priority_min (policy);
const int p_max = sched_get_priority_max (policy);
priority += p_max;
if (priority > p_max) priority = p_max;
if (priority < p_min) priority = p_min;
parm.sched_priority = priority;
pthread_attr_init (&attr);
pthread_attr_setschedpolicy (&attr, policy);
pthread_attr_setschedparam (&attr, &parm);
pthread_attr_setscope (&attr, PTHREAD_SCOPE_SYSTEM);
pthread_attr_setinheritsched (&attr, PTHREAD_EXPLICIT_SCHED);
pthread_attr_setstacksize (&attr, stacksize);
rv = pthread_create (thread, &attr, start_routine, arg);
pthread_attr_destroy (&attr);
return rv;
}
#endif