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TIMER: Enabled catchup clock ticks

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Historically, hosts which have a tick size slower than the tick a simulator
wants to implement can't idle effectively and keep good time.

This change allows simulators which call sim_rtcn_tick_ack() to provide
useful idling behavior while still keeping the passage of wall clock time
to time in the simulator accurate.
This commit is contained in:
Mark Pizzolato
2016-12-10 11:59:49 -08:00
parent 1c3c50fd26
commit 5d8553e24c
3 changed files with 121 additions and 91 deletions
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3
sim_timer.h
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@@ -106,11 +106,12 @@ double sim_timenow_double (void);
int32 sim_rtcn_init (int32 time, int32 tmr);
int32 sim_rtcn_init_unit (UNIT *uptr, int32 time, int32 tmr);
void sim_rtcn_get_time (struct timespec *now, int tmr);
t_stat sim_rtcn_tick_ack (int32 time, int32 tmr);
t_stat sim_rtcn_tick_ack (uint32 time, int32 tmr);
void sim_rtcn_init_all (void);
int32 sim_rtcn_calb (int32 ticksper, int32 tmr);
int32 sim_rtc_init (int32 time);
int32 sim_rtc_calb (int32 ticksper);
t_stat sim_set_timers (int32 arg, CONST char *cptr);
t_stat sim_show_timers (FILE* st, DEVICE *dptr, UNIT* uptr, int32 val, CONST char* desc);
t_stat sim_show_clock_queues (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, CONST char *cptr);
t_bool sim_idle (uint32 tmr, t_bool sin_cyc);