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jscene: atomic queue access for interrupt-safety

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Lephenixnoir 2024-08-28 08:39:09 +02:00
parent 5e2488cdf4
commit 550c08e200
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GPG key ID: 1BBA026E13FC0495
1 changed files with 14 additions and 4 deletions
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18
src/jscene.c
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@ -9,6 +9,7 @@
#include <gint/std/stdlib.h>
#include <gint/gint.h>
#include <gint/drivers/t6k11.h>
#include <gint/cpu.h>
/* Type identifier for jscene */
static int jscene_type_id = -1;
@ -89,25 +90,34 @@ void jscene_render(jscene *scene)
jevent jscene_read_event(jscene *s)
{
if(s->queue_first == s->queue_next)
cpu_atomic_start();
if(s->queue_first == s->queue_next) {
cpu_atomic_end();
return (jevent){ .source = NULL, .type = JSCENE_NONE };
}
jevent e = s->queue[s->queue_first];
s->queue_first = (s->queue_first + 1) % JSCENE_QUEUE_SIZE;
cpu_atomic_end();
return e;
}
void jscene_queue_event(jscene *s, jevent e)
{
cpu_atomic_start();
/* Prevent filling and overflowing the queue */
int next = (s->queue_next + 1) % JSCENE_QUEUE_SIZE;
if(next == s->queue_first) {
s->lost_events++;
return;
}
else {
s->queue[s->queue_next] = e;
s->queue_next = next;
}
s->queue[s->queue_next] = e;
s->queue_next = next;
cpu_atomic_end();
}
//---