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Fixed sim_idle to account for a reasonable number of cycles which have passed when an asynchrnous event terminated the idle wait.

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Also corrected the text of a printf which described the units of the asynch latency variable as nano seconds instead of microseconds.
This commit is contained in:
Mark Pizzolato 2011-04-22 05:47:26 -07:00
parent 049540aa20
commit f7b53a5fe9
2 changed files with 8 additions and 1 deletions
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2
scp.c
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@ -1823,7 +1823,7 @@ else {
fprintf (st, " event delay %d, queue time %d\n", uptr->a_event_time, uptr->a_sim_interval); fprintf (st, " event delay %d, queue time %d\n", uptr->a_event_time, uptr->a_sim_interval);
} }
} }
fprintf (st, "asynch latency: %d microseconds\n", sim_asynch_latency); fprintf (st, "asynch latency: %d nanoseconds\n", sim_asynch_latency);
fprintf (st, "asynch instruction latency: %d instructions\n", sim_asynch_inst_latency); fprintf (st, "asynch instruction latency: %d instructions\n", sim_asynch_inst_latency);
pthread_mutex_unlock (&sim_asynch_lock); pthread_mutex_unlock (&sim_asynch_lock);
#endif #endif

7
sim_timer.c
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@ -23,6 +23,8 @@
used in advertising or otherwise to promote the sale, use or other dealings used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Robert M Supnik. in this Software without prior written authorization from Robert M Supnik.
22-Apr-11 MP Fixed Asynch I/O support to reasonably account cycles
when an idle wait is terminated by an external event
05-Jan-11 MP Added Asynch I/O support 05-Jan-11 MP Added Asynch I/O support
29-Dec-10 MP Fixed clock resolution determination for Unix platforms 29-Dec-10 MP Fixed clock resolution determination for Unix platforms
22-Sep-08 RMS Added "stability threshold" for idle routine 22-Sep-08 RMS Added "stability threshold" for idle routine
@ -44,6 +46,9 @@
sim_os_msec - return elapsed time in msec sim_os_msec - return elapsed time in msec
sim_os_sleep - sleep specified number of seconds sim_os_sleep - sleep specified number of seconds
sim_os_ms_sleep - sleep specified number of milliseconds sim_os_ms_sleep - sleep specified number of milliseconds
sim_idle_ms_sleep - sleep specified number of milliseconds
or until awakened by an asynchronous
event
The calibration, idle, and throttle routines are OS-independent; the _os_ The calibration, idle, and throttle routines are OS-independent; the _os_
routines are not. routines are not.
@ -576,6 +581,8 @@ if (w_idle == 0) { /* none? */
} }
act_ms = SIM_IDLE_MS_SLEEP (w_ms); /* wait */ act_ms = SIM_IDLE_MS_SLEEP (w_ms); /* wait */
act_cyc = act_ms * cyc_ms; act_cyc = act_ms * cyc_ms;
if (act_ms < w_ms) /* awakened early? */
act_cyc += (cyc_ms * sim_idle_rate_ms) / 2; /* account for half an interval's worth of cycles */
if (sim_interval > act_cyc) if (sim_interval > act_cyc)
sim_interval = sim_interval - act_cyc; sim_interval = sim_interval - act_cyc;
else sim_interval = 0; else sim_interval = 0;