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syscall: fix some missed-signal bugs in kern_object_wait

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max 🍓
2026-03-14 22:32:26 +00:00
parent 2d267d2b51
commit a146f4a750
1 changed files with 19 additions and 12 deletions
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31
syscall/object.c
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@@ -2,6 +2,7 @@
#include <kernel/sched.h>
#include <kernel/syscall.h>
#include <kernel/task.h>
#include <kernel/thread.h>
#include <kernel/wait.h>
#include <mango/status.h>
#include <mango/types.h>
@@ -18,31 +19,36 @@ kern_status_t sys_kern_object_wait(kern_wait_item_t *items, size_t nr_items)
return KERN_MEMORY_FAULT;
}
self_thread->tr_state = THREAD_SLEEPING;
kern_status_t status = KERN_OK;
struct object *objects[KERN_WAIT_MAX_ITEMS];
struct wait_item waiters[KERN_WAIT_MAX_ITEMS];
unsigned long irq_flags = 0;
size_t i = 0, to_release = 0;
size_t nr_retained = 0;
bool signals_observed = false;
for (i = 0; i < nr_items; i++) {
kern_handle_t handle = items[i].w_handle;
for (nr_retained = 0; nr_retained < nr_items; nr_retained++) {
kern_handle_t handle = items[nr_retained].w_handle;
handle_flags_t flags;
struct object *object = NULL;
status = task_resolve_handle(self, handle, &object, &flags);
if (status != KERN_OK) {
break;
}
objects[i] = object;
objects[nr_retained] = object;
object_lock_irqsave(object, &irq_flags);
wait_item_init(&waiters[i], self_thread);
thread_wait_begin(&waiters[i], &object->ob_wq);
wait_item_init(&waiters[nr_retained], self_thread);
thread_wait_begin_nosleep(
&waiters[nr_retained],
&object->ob_wq);
if (object->ob_signals & items[i].w_waitfor) {
if (object->ob_signals & items[nr_retained].w_waitfor) {
signals_observed = true;
items[i].w_observed = object->ob_signals;
items[nr_retained].w_observed = object->ob_signals;
}
object_unlock_irqrestore(object, irq_flags);
@@ -54,22 +60,23 @@ kern_status_t sys_kern_object_wait(kern_wait_item_t *items, size_t nr_items)
schedule(SCHED_NORMAL);
for (i = 0; i < nr_items; i++) {
for (size_t i = 0; i < nr_retained; i++) {
object_lock_irqsave(objects[i], &irq_flags);
if (objects[i]->ob_signals & items[i].w_waitfor) {
signals_observed = true;
items[i].w_observed = objects[i]->ob_signals;
}
object_unlock_irqrestore(objects[i], irq_flags);
}
cleanup:
to_release = i;
for (i = 0; i < to_release; i++) {
thread_wait_end(&waiters[i], &objects[i]->ob_wq);
for (size_t i = 0; i < nr_retained; i++) {
thread_wait_end_nosleep(&waiters[i], &objects[i]->ob_wq);
object_unref(objects[i]);
}
self_thread->tr_state = THREAD_READY;
return status;
}