83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
/* $Id$
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******************************************************************************
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Fax program for ISDN.
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Simple timers for controlling the state-machine(s).
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Copyright (C) 1999 Morten Rolland [Morten.Rolland@asker.mail.telia.com]
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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******************************************************************************
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*/
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/* The timers are very simple stuff: Decrease the value of the active
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* timers by the specified ammount (unit of samples, given by the main
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* loop), and set of a software signal when it reaches zero.
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* If the timer is one-shot, it is disabled after the first signal.
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*
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* NOTE: A timer is identified by an integer value (index). All signals
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* are also identified by an integer value, and they are related such that
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* when a timer 'n' reaces zero, the corresponding signal number 'n' is
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* signaled.
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*
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* BUG: This implementation is not very efficient, a sorted queue should
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* be used so we don't have to decrement all the timers all the time, but
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* this task is left as an exercise for the annoyed purist.
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*/
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#include <ifax/misc/timers.h>
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#include <ifax/misc/softsignals.h>
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static struct {
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ifax_sint32 current_value;
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ifax_sint32 initial_value;
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} timers[MAX_TIMERS];
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void one_shot_timer(int timer_num, ifax_sint32 delay)
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{
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timers[timer_num].current_value = delay;
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timers[timer_num].initial_value = 0;
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softsignaled_clr(timer_num);
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}
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void reset_timers(void)
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{
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int t;
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for ( t=0; t < MAX_TIMERS; t++ ) {
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timers[t].current_value = 0;
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timers[t].initial_value = 0;
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}
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}
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void decrease_timers(ifax_sint32 dec)
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{
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int t;
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for ( t=0; t < MAX_TIMERS; t++ ) {
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if ( timers[t].current_value > 0 ) {
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timers[t].current_value -= dec;
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if ( timers[t].current_value <= 0 ) {
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softsignal(t);
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if ( timers[t].initial_value > 0 )
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timers[t].current_value += timers[t].initial_value;
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}
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}
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}
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}
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