1da2708a7c
on timer_unregister callbacks are not removed It seems (at least on the Rocker) timers continue to fire (for a bit??) Now we store the registered callback in the sigev structure and check that the callback matches the one registered when the timer is created. This should stop the possible case of a new timer getting spurious callbacks We also now NULL the callbacks on un-register which should stop the segfaults Added some notes to timer.c and timer.h Change-Id: Ia155c3a4e4af89f474d55ed845560ccc1fab85aa
68 lines
2.2 KiB
C
68 lines
2.2 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) 2005 Jens Arnold
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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 <stdbool.h>
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#include "config.h"
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#include "cpu.h"
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#include "system.h"
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#include "timer.h"
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#include "logf.h"
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static int timer_prio = -1;
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void SHAREDBSS_ATTR (*pfn_timer)(void) = NULL; /* timer callback */
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void SHAREDBSS_ATTR (*pfn_unregister)(void) = NULL; /* unregister callback */
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/* Register a user timer, called every <cycles> TIMER_FREQ cycles */
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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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IF_COP(, int core))
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{
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if (reg_prio <= timer_prio || cycles == 0)
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return false;
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if (!timer_set(cycles, true))
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return false;
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pfn_timer = timer_callback;
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/* NOTE: if unreg cb is defined you are in charge of calling timer_unregister() */
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pfn_unregister = unregister_callback;
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timer_prio = reg_prio;
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return timer_start(IF_COP(core));
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}
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bool timer_set_period(long cycles)
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{
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return timer_set(cycles, false);
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}
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/* NOTE: unregister callbacks are not called by timer_unregister()
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* the unregister_callback only gets called when your timer gets
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* overwritten by a lower priority timer using timer_register() */
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void timer_unregister(void)
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{
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timer_stop();
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pfn_timer = NULL;
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pfn_unregister = NULL;
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timer_prio = -1;
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}
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