Make simulator event-queue manager a bit more signal safe.

sim/common/ChangeLog

@@ -1,5 +1,26 @@
 Mon May 19 12:07:22 1997  Andrew Cagney  <cagney@b1.cygnus.com>
 
+	* sim-events.c (sim_events_zalloc): Signal save memory allocator -
+ 	stop tk interrupting malloc calls.
+	(sim_events_zalloc): Converse.
+
+	* Make-common.in (sim_main_headers): Add sim-events.h.
+
+	* sim-events.c (sim_events_schedule_after_signal): Change return
+ 	type to void - signal events are strictly internal.
+	(sim_events_init): Allocate a finite buffer for signal events.
+	(sim_events_schedule_after_signal): Enter signal events into the
+ 	signal buffer.
+
+	* sim-engine.c (sim_engine_halt): Check SIM_DESC magic.
+	(sim_engine_restart): Ditto.
+	(sim_engine_abort): Ditto.
+	* sim-stop.c (sim_stop): Ditto.
+	(control_c_simulation): Ditto.
+	* sim-resume.c (sim_resume): Ditto.
+	(has_stepped): Ditto.
+	* sim-abort.c (sim_engine_abort): Ditto.
+
 	* sim-basics.h (transfer_type): New type.
 
 	* sim-core.c (sim_core_signal): New function. Print core signal

sim/tic80/ChangeLog

@@ -1,3 +1,7 @@
+Mon May 19 14:58:47 1997  Andrew Cagney  <cagney@b1.cygnus.com>
+
+	* sim-calls.c (sim_open): Set the simulator base magic number.
+
 Fri May 16 14:35:30 1997  Andrew Cagney  <cagney@b1.cygnus.com>
 
 	* insns (illegal, fp_unavailable): Halt instead of abort the

sim/tic80/sim-calls.c

@@ -53,6 +53,7 @@ SIM_DESC
 sim_open (SIM_OPEN_KIND kind, char **argv)
 {
   STATE_OPEN_KIND (&simulation) = kind;
+  STATE_MAGIC (&simulation) = SIM_MAGIC_NUMBER;
 
   /* establish the simulator configuration */
   sim_config (&simulation,