204ac257fe
The implementation wasn't really safe (sem_post from signal handler), and the new one simplifies things a bit. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29575 a1c6a512-1295-4272-9138-f99709370657
111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (c) 2010 Thomas Martitz
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <time.h>
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#include <signal.h>
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#include <errno.h>
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#include <unistd.h>
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#include <pthread.h>
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#include "config.h"
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#include "system.h"
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#include "button.h"
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#include "audio.h"
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#include "panic.h"
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static pthread_cond_t wfi_cond = PTHREAD_COND_INITIALIZER;
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static pthread_mutex_t wfi_mtx = PTHREAD_MUTEX_INITIALIZER;
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/*
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* call tick tasks and wake the scheduler up */
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void timer_signal(union sigval arg)
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{
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(void)arg;
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call_tick_tasks();
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interrupt();
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}
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/*
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* wait on the sem which the signal handler posts to save cpu time (aka sleep)
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*
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* other mechanisms could use them as well */
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void wait_for_interrupt(void)
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{
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pthread_cond_wait(&wfi_cond, &wfi_mtx);
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}
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/*
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* Wakeup the kernel, if sleeping (shall not be called from a signal handler) */
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void interrupt(void)
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{
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pthread_cond_signal(&wfi_cond);
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}
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/*
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* setup a hrtimer to send a signal to our process every tick */
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void tick_start(unsigned int interval_in_ms)
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{
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int ret = 0;
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timer_t timerid;
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struct itimerspec ts;
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sigevent_t sigev;
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/* initializing in the declaration causes some weird warnings */
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memset(&sigev, 0, sizeof(sigevent_t));
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sigev.sigev_notify = SIGEV_THREAD,
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sigev.sigev_notify_function = timer_signal,
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ts.it_value.tv_sec = ts.it_interval.tv_sec = 0;
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ts.it_value.tv_nsec = ts.it_interval.tv_nsec = interval_in_ms*1000*1000;
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/* add the timer */
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ret |= timer_create(CLOCK_REALTIME, &sigev, &timerid);
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ret |= timer_settime(timerid, 0, &ts, NULL);
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/* Grab the mutex already now and leave it to this thread. We don't
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* care about race conditions when signaling the condition (because
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* they are not critical), but a mutex is necessary due to the API */
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pthread_mutex_lock(&wfi_mtx);
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if (ret != 0)
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panicf("%s(): %s\n", __func__, strerror(errno));
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}
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bool timer_register(int reg_prio, void (*unregister_callback)(void),
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long cycles, void (*timer_callback)(void))
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{
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(void)reg_prio;
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(void)unregister_callback;
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(void)cycles;
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(void)timer_callback;
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return false;
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}
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bool timer_set_period(long cycles)
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{
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(void)cycles;
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return false;
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}
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void timer_unregister(void)
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{
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}
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