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VAX: Change HALT behavior to dispatch non polling events prior to returning to SCP.

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This allows pending I/O (console, or otherwise) to complete before dropping
back to the sim> prompt.  This better simulates the model where scp is analogous
to the console processor on the older VAX simulators.  This better addresses the
incomplete I/O problems discussed in #208
This commit is contained in:
Mark Pizzolato 2015-12-10 05:40:13 -08:00
parent ed5353b4f4
commit 2549f34560
1 changed files with 6 additions and 4 deletions
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10
VAX/vax_cpu.c
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@ -2582,10 +2582,12 @@ for ( ;; ) {
else if (cpu_unit.flags & UNIT_CONH) /* halt to console? */ else if (cpu_unit.flags & UNIT_CONH) /* halt to console? */
cc = con_halt (CON_HLTINS, cc); /* enter firmware */ cc = con_halt (CON_HLTINS, cc); /* enter firmware */
else { else {
/* allow potentially pending console output to */ /* allow potentially pending I/O (console output,
/* be displayed before dropping back to scp */ or other devices) to complete before dropping
if (sim_interval <= SERIAL_OUT_WAIT) { back to scp */
sim_interval -= SERIAL_OUT_WAIT; while ((sim_clock_queue != QUEUE_LIST_END) &&
((sim_clock_queue->flags & UNIT_IDLE) == 0)) {
sim_interval = 0;
temp = sim_process_event (); temp = sim_process_event ();
if (temp) if (temp)
ABORT (temp); ABORT (temp);