Removed ... not used.
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/***************************************************************************
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TITLE: ls_sync.c
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----------------------------------------------------------------------------
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FUNCTION: Real-time synchronization routines for LaRCSIM
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----------------------------------------------------------------------------
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MODULE STATUS: Developmental
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----------------------------------------------------------------------------
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GENEALOGY: Written 921229 by Bruce Jackson
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----------------------------------------------------------------------------
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DESIGNED BY: EBJ
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CODED BY: EBJ
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MAINTAINED BY: EBJ
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----------------------------------------------------------------------------
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MODIFICATION HISTORY:
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DATE PURPOSE BY
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930104 Added ls_resync() call to avoid having to pass DT as a
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global variable. EBJ
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940204 Added calculation of sim_control variable overrun to
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indicate a frame overrun has occurred. EBJ
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940506 Added support for sim_control_.debug flag, which disables
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synchronization (there is still a local dbg flag that
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enables synch error logging) EBJ
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CURRENT RCS HEADER:
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$Header$
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$Log$
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Revision 1.1 1997/05/29 00:10:00 curt
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Initial Flight Gear revision.
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* Revision 1.7 1994/05/06 15:34:54 bjax
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* Removed "freerun" variable, and substituted sim_control_.debug flag.
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*
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* Revision 1.6 1994/02/16 13:01:22 bjax
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* Added logic to signal frame overrun; corrected syntax on ls_catch call
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* (old style may be BSD format). EBJ
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*
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* Revision 1.5 1993/07/30 18:33:14 bjax
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* Added 'dt' parameter to call to ls_sync from ls_resync routine.
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*
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* Revision 1.4 1993/03/15 14:56:13 bjax
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* Removed call to ls_pause; this should be done in cockpit routine.
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*
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* Revision 1.3 93/03/13 20:34:09 bjax
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* Modified to allow for sync times longer than a second; added ls_pause() EBJ
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*
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* Revision 1.2 93/01/06 09:50:47 bjax
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* Added ls_resync() function.
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*
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* Revision 1.1 92/12/30 13:19:51 bjax
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* Initial revision
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*
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* Revision 1.3 93/12/31 10:34:11 bjax
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* Added $Log marker as well.
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*
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----------------------------------------------------------------------------
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REFERENCES:
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----------------------------------------------------------------------------
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CALLED BY:
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----------------------------------------------------------------------------
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CALLS TO:
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----------------------------------------------------------------------------
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INPUTS:
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----------------------------------------------------------------------------
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OUTPUTS:
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--------------------------------------------------------------------------*/
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#include <sys/time.h>
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#include <signal.h>
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#include <stdio.h>
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#include "ls_types.h"
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#include "ls_sim_control.h"
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extern SCALAR Simtime;
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/* give the time interval data structure FILE visibility */
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static struct itimerval t, ot;
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static int dbug = 0;
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/*void ls_catch( sig, code, sc) /* signal handler */
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/*int sig;
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int code;
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struct sigcontext *sc;*/
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void ls_catch()
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{
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static DATA lastSimtime = -99.9;
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/* printf("In ls_catch()\n"); */
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/*if (lastSimtime == Simtime) fprintf(stderr, "Overrun.\n"); */
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if (dbug) printf("ls_catch called\n");
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sim_control_.overrun = (lastSimtime == Simtime);
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lastSimtime = Simtime;
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signal(SIGALRM, ls_catch);
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}
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void ls_sync(dt)
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float dt;
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/* this routine syncs up the interval timer for a new dt value */
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{
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int terr;
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int isec;
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float usec;
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if (sim_control_.debug!=0) return;
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isec = (int) dt;
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usec = 1000000* (dt - (float) isec);
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t.it_interval.tv_sec = isec;
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t.it_interval.tv_usec = usec;
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t.it_value.tv_sec = isec;
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t.it_value.tv_usec = usec;
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if (dbug) printf("ls_sync called\n");
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ls_catch(); /* set up for SIGALRM signal catch */
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terr = setitimer( ITIMER_REAL, &t, &ot );
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if (terr) perror("Error returned from setitimer");
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}
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void ls_unsync()
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/* this routine unsyncs the interval timer */
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{
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int terr;
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if (sim_control_.debug!=0) return;
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t.it_interval.tv_sec = 0;
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t.it_interval.tv_usec = 0;
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t.it_value.tv_sec = 0;
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t.it_value.tv_usec = 0;
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if (dbug) printf("ls_unsync called\n");
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terr = setitimer( ITIMER_REAL, &t, &ot );
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if (terr) perror("Error returned from setitimer");
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}
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void ls_resync()
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/* this routine resynchronizes the interval timer to the old
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interrupt period, stored in struct ot by a previous call
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to ls_unsync(). */
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{
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float dt;
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if (sim_control_.debug!=0) return;
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if (dbug) printf("ls_resync called\n");
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dt = ((float) ot.it_interval.tv_usec)/1000000. +
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((float) ot.it_interval.tv_sec);
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ls_sync(dt);
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}
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void ls_pause()
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/* this routine waits for the next interrupt */
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{
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if (sim_control_.debug!=0) return;
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if (dbug) printf("ls_pause called\n");
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pause();
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}
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