mirror of
https://git.code.sf.net/p/fuse-emulator/fuse
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99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
/* timer.c: Speed routines for Fuse
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Copyright (c) 1999-2001 Philip Kendall
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$Id$
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Author contact information:
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E-mail: pak21-fuse@srcf.ucam.org
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Postal address: 15 Crescent Road, Wokingham, Berks, RG40 2DB, England
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*/
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#include <config.h>
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#include <signal.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include "fuse.h"
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#include "spectrum.h"
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#include "timer.h"
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volatile int timer_count;
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/* Just places to store the old timer and signal handlers; restored
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on exit */
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static struct itimerval timer_old_timer;
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static struct sigaction timer_old_handler;
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static void timer_setup_timer(void);
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static void timer_setup_handler(void);
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void timer_signal( int signo );
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int timer_init(void)
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{
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timer_count=0;
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timer_setup_handler();
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timer_setup_timer();
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return 0;
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}
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static void timer_setup_timer(void)
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{
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struct itimerval timer;
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timer.it_interval.tv_sec=0;
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timer.it_interval.tv_usec=20000;
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timer.it_value.tv_sec=0;
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timer.it_value.tv_usec=20000;
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setitimer(ITIMER_REAL,&timer,&timer_old_timer);
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}
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static void timer_setup_handler(void)
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{
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struct sigaction handler;
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handler.sa_handler=timer_signal;
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sigemptyset(&handler.sa_mask);
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handler.sa_flags=0;
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sigaction(SIGALRM,&handler,&timer_old_handler);
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}
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void
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timer_signal( int signo GCC_UNUSED )
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{
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/* If the emulator is running, note that time has passed */
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if( !fuse_emulation_paused ) timer_count++;
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}
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void timer_sleep(void)
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{
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/* Go to sleep iff we're emulating things fast enough */
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if ( timer_count <= 0 ) pause();
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}
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int timer_end(void)
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{
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/* Restore the old timer */
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setitimer(ITIMER_REAL,&timer_old_timer,NULL);
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/* And the old signal handler */
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sigaction(SIGALRM,&timer_old_handler,NULL);
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return 0;
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}
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