/* This file is part of the program psim.
- Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au>
+ Copyright (C) 1994-1998, Andrew Cagney <cagney@highland.com.au>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#ifndef _EVENTS_C_
#define _EVENTS_C_
-#ifndef STATIC_INLINE_EVENTS
-#define STATIC_INLINE_EVENTS STATIC_INLINE
-#endif
-
-
#include "basics.h"
#include "events.h"
+#include <signal.h>
+
+#if !defined (SIM_EVENTS_POLL_RATE)
+#define SIM_EVENTS_POLL_RATE 0x1000
+#endif
+
+
/* The event queue maintains a single absolute time using two
variables.
TIME_OF_EVENT: this holds the time at which the next event is ment
to occure. If no next event it will hold the time of the last
- event. The first event occures at time 0 - system start.
+ event.
TIME_FROM_EVENT: The current distance from TIME_OF_EVENT. If an
event is pending, this will be positive. If no future event is
pending this will be negative. This variable is decremented once
for each iteration of a clock cycle.
+ Initially, the clock is started at time one (1) with TIME_OF_EVENT
+ == 0 and TIME_FROM_EVENT == -1.
+
Clearly there is a bug in that this code assumes that the absolute
time counter will never become greater than 2^62. */
};
struct _event_queue {
+ int processing;
event_entry *queue;
event_entry *volatile held;
event_entry *volatile *volatile held_end;
};
-INLINE_EVENTS event_queue *
+STATIC_INLINE_EVENTS\
+(void)
+sim_events_poll (void *data)
+{
+ event_queue *queue = data;
+ /* just re-schedule in 1000 million ticks time */
+ event_queue_schedule (queue, SIM_EVENTS_POLL_RATE, sim_events_poll, queue);
+ sim_io_poll_quit ();
+}
+
+
+INLINE_EVENTS\
+(event_queue *)
event_queue_create(void)
{
event_queue *new_event_queue = ZALLOC(event_queue);
+ new_event_queue->processing = 0;
new_event_queue->queue = NULL;
new_event_queue->held = NULL;
new_event_queue->held_end = &new_event_queue->held;
+
/* both times are already zero */
return new_event_queue;
}
+INLINE_EVENTS\
+(void)
+event_queue_init(event_queue *queue)
+{
+ event_entry *event;
+
+ /* drain the interrupt queue */
+ {
+#if defined(HAVE_SIGPROCMASK) && defined(SIG_SETMASK)
+ sigset_t old_mask;
+ sigset_t new_mask;
+ sigfillset(&new_mask);
+ /*-LOCK-*/ sigprocmask(SIG_SETMASK, &new_mask, &old_mask);
+#endif
+ event = queue->held;
+ while (event != NULL) {
+ event_entry *dead = event;
+ event = event->next;
+ zfree(dead);
+ }
+ queue->held = NULL;
+ queue->held_end = &queue->held;
+#if defined(HAVE_SIGPROCMASK) && defined(SIG_SETMASK)
+ /*-UNLOCK-*/ sigprocmask(SIG_SETMASK, &old_mask, NULL);
+#endif
+ }
+
+ /* drain the normal queue */
+ event = queue->queue;
+ while (event != NULL) {
+ event_entry *dead = event;
+ event = event->next;
+ zfree(dead);
+ }
+ queue->queue = NULL;
+
+ /* wind time back to one */
+ queue->processing = 0;
+ queue->time_of_event = 0;
+ queue->time_from_event = -1;
+
+ /* schedule our initial counter event */
+ event_queue_schedule (queue, 0, sim_events_poll, queue);
+}
+
+INLINE_EVENTS\
+(signed64)
+event_queue_time(event_queue *queue)
+{
+ return queue->time_of_event - queue->time_from_event;
+}
+
+STATIC_INLINE_EVENTS\
+(void)
+update_time_from_event(event_queue *events)
+{
+ signed64 current_time = event_queue_time(events);
+ if (events->queue != NULL) {
+ events->time_from_event = (events->queue->time_of_event - current_time);
+ events->time_of_event = events->queue->time_of_event;
+ }
+ else {
+ events->time_of_event = current_time - 1;
+ events->time_from_event = -1;
+ }
+ ASSERT(current_time == event_queue_time(events));
+ ASSERT((events->time_from_event >= 0) == (events->queue != NULL));
+}
-STATIC_INLINE_EVENTS void
+STATIC_INLINE_EVENTS\
+(void)
insert_event_entry(event_queue *events,
event_entry *new_event,
signed64 delta)
{
event_entry *curr;
- event_entry **last;
+ event_entry **prev;
signed64 time_of_event;
- if (delta <= 0)
- error("can not schedule event for current time\n");
+ if (delta < 0)
+ error("what is past is past!\n");
/* compute when the event should occure */
- time_of_event = (events->time_of_event
- - events->time_from_event
- + delta);
+ time_of_event = event_queue_time(events) + delta;
/* find the queue insertion point - things are time ordered */
- last = &events->queue;
+ prev = &events->queue;
curr = events->queue;
while (curr != NULL && time_of_event >= curr->time_of_event) {
- last = &curr->next;
+ ASSERT(curr->next == NULL
+ || curr->time_of_event <= curr->next->time_of_event);
+ prev = &curr->next;
curr = curr->next;
}
+ ASSERT(curr == NULL || time_of_event < curr->time_of_event);
/* insert it */
new_event->next = curr;
- *last = new_event;
+ *prev = new_event;
new_event->time_of_event = time_of_event;
/* adjust the time until the first event */
- events->time_from_event = (events->queue->time_of_event
- - (events->time_of_event
- - events->time_from_event));
- events->time_of_event = events->queue->time_of_event;
+ update_time_from_event(events);
}
-INLINE_EVENTS event_entry_tag
+INLINE_EVENTS\
+(event_entry_tag)
event_queue_schedule(event_queue *events,
signed64 delta_time,
event_handler *handler,
new_event->data = data;
new_event->handler = handler;
insert_event_entry(events, new_event, delta_time);
- return new_event;
+ TRACE(trace_events, ("event scheduled at %ld - tag 0x%lx - time %ld, handler 0x%lx, data 0x%lx\n",
+ (long)event_queue_time(events),
+ (long)new_event,
+ (long)new_event->time_of_event,
+ (long)new_event->handler,
+ (long)new_event->data));
+ return (event_entry_tag)new_event;
}
-INLINE_EVENTS event_entry_tag
+INLINE_EVENTS\
+(event_entry_tag)
event_queue_schedule_after_signal(event_queue *events,
signed64 delta_time,
event_handler *handler,
new_event->time_of_event = delta_time; /* work it out later */
new_event->next = NULL;
- /*-LOCK-*/
- if (events->held == NULL) {
- events->held = new_event;
- }
- else {
- *events->held_end = new_event;
+ {
+#if defined(HAVE_SIGPROCMASK) && defined(SIG_SETMASK)
+ sigset_t old_mask;
+ sigset_t new_mask;
+ sigfillset(&new_mask);
+ /*-LOCK-*/ sigprocmask(SIG_SETMASK, &new_mask, &old_mask);
+#endif
+ if (events->held == NULL) {
+ events->held = new_event;
+ }
+ else {
+ *events->held_end = new_event;
+ }
+ events->held_end = &new_event->next;
+#if defined(HAVE_SIGPROCMASK) && defined(SIG_SETMASK)
+ /*-UNLOCK-*/ sigprocmask(SIG_SETMASK, &old_mask, NULL);
+#endif
}
- events->held_end = &new_event->next;
- /*-UNLOCK-*/
- return new_event;
+ TRACE(trace_events, ("event scheduled at %ld - tag 0x%lx - time %ld, handler 0x%lx, data 0x%lx\n",
+ (long)event_queue_time(events),
+ (long)new_event,
+ (long)new_event->time_of_event,
+ (long)new_event->handler,
+ (long)new_event->data));
+
+ return (event_entry_tag)new_event;
}
-INLINE_EVENTS void
+INLINE_EVENTS\
+(void)
event_queue_deschedule(event_queue *events,
event_entry_tag event_to_remove)
{
+ event_entry *to_remove = (event_entry*)event_to_remove;
+ ASSERT((events->time_from_event >= 0) == (events->queue != NULL));
if (event_to_remove != NULL) {
event_entry *current;
event_entry **ptr_to_current;
for (ptr_to_current = &events->queue, current = *ptr_to_current;
- current != NULL && current != event_to_remove;
+ current != NULL && current != to_remove;
ptr_to_current = ¤t->next, current = *ptr_to_current);
- if (current == event_to_remove) {
+ if (current == to_remove) {
*ptr_to_current = current->next;
+ TRACE(trace_events, ("event descheduled at %ld - tag 0x%lx - time %ld, handler 0x%lx, data 0x%lx\n",
+ (long)event_queue_time(events),
+ (long)event_to_remove,
+ (long)current->time_of_event,
+ (long)current->handler,
+ (long)current->data));
zfree(current);
- /* Just forget to recompute the delay to the next event */
+ update_time_from_event(events);
+ }
+ else {
+ TRACE(trace_events, ("event descheduled at %ld - tag 0x%lx - not found\n",
+ (long)event_queue_time(events),
+ (long)event_to_remove));
}
}
+ ASSERT((events->time_from_event >= 0) == (events->queue != NULL));
}
-INLINE_EVENTS int
+INLINE_EVENTS\
+(int)
event_queue_tick(event_queue *events)
{
- /* remove things from the asynchronous event queue onto the real one */
+ signed64 time_from_event;
+
+ /* we should only be here when the previous tick has been fully processed */
+ ASSERT(!events->processing);
+
+ /* move any events that were queued by any signal handlers onto the
+ real event queue. BTW: When inlining, having this code here,
+ instead of in event_queue_process() causes GCC to put greater
+ weight on keeping the pointer EVENTS in a register. This, in
+ turn results in better code being output. */
if (events->held != NULL) {
event_entry *held_events;
event_entry *curr_event;
- /*-LOCK-*/
- held_events = events->held;
- events->held = NULL;
- events->held_end = &events->held;
- /*-UNLOCK-*/
+ {
+#if defined(HAVE_SIGPROCMASK) && defined(SIG_SETMASK)
+ sigset_t old_mask;
+ sigset_t new_mask;
+ sigfillset(&new_mask);
+ /*-LOCK-*/ sigprocmask(SIG_SETMASK, &new_mask, &old_mask);
+#endif
+ held_events = events->held;
+ events->held = NULL;
+ events->held_end = &events->held;
+#if defined(HAVE_SIGPROCMASK) && defined(SIG_SETMASK)
+ /*-UNLOCK-*/ sigprocmask(SIG_SETMASK, &old_mask, NULL);
+#endif
+ }
do {
curr_event = held_events;
/* advance time, checking to see if we've reached time zero which
would indicate the time for the next event has arrived */
- events->time_from_event -= 1;
- return events->time_from_event == 0;
+ time_from_event = events->time_from_event;
+ events->time_from_event = time_from_event - 1;
+ return time_from_event == 0;
}
-INLINE_EVENTS void
+
+
+INLINE_EVENTS\
+(void)
event_queue_process(event_queue *events)
{
- if (events->time_from_event == 0) {
- /* consume all events for this or earlier times */
- do {
- event_entry *to_do = events->queue;
- events->queue = to_do->next;
- to_do->handler(events,
- to_do->data);
- zfree(to_do);
- } while (events->queue != NULL
- && events->queue->time_of_event <= events->time_of_event);
- /* re-caculate time for new events */
- if (events->queue != NULL) {
- events->time_from_event = (events->queue->time_of_event
- - events->time_of_event);
- events->time_of_event = events->queue->time_of_event;
- }
- else {
- /* nothing to do, time_from_event will go negative */
- }
+ signed64 event_time = event_queue_time(events);
+
+ ASSERT((events->time_from_event == -1 && events->queue != NULL)
+ || events->processing); /* something to do */
+
+ /* consume all events for this or earlier times. Be careful to
+ allow a new event to appear under our feet */
+ events->processing = 1;
+ while (events->queue != NULL
+ && events->queue->time_of_event <= event_time) {
+ event_entry *to_do = events->queue;
+ event_handler *handler = to_do->handler;
+ void *data = to_do->data;
+ events->queue = to_do->next;
+ TRACE(trace_events, ("event issued at %ld - tag 0x%lx - handler 0x%lx, data 0x%lx\n",
+ (long)event_time,
+ (long)to_do,
+ (long)handler,
+ (long)data));
+ zfree(to_do);
+ handler(data);
}
-}
+ events->processing = 0;
-INLINE_EVENTS signed64
-event_queue_time(event_queue *queue)
-{
- return queue->time_of_event - queue->time_from_event;
+ /* re-caculate time for new events */
+ update_time_from_event(events);
}
projects / external / binutils.git / blobdiff