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Code Issues 1 Releases Wiki Activity

Fix reference counting for threaded abstract types.

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Was very borked. The sweep phase should drop references to unused
abstracts but wasn't, resulting in each collection decrementing the
count by one until 0 was hit, even if other threads maintained a
reference.
This commit is contained in:
Calvin Rose 2023-08-20 14:50:46 -05:00
parent 5f5e5cf693
commit e5893d0692
2 changed files with 8 additions and 6 deletions
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2
src/core/abstract.c
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@ -182,7 +182,7 @@ void janet_os_mutex_lock(JanetOSMutex *mutex) {
void janet_os_mutex_unlock(JanetOSMutex *mutex) { void janet_os_mutex_unlock(JanetOSMutex *mutex) {
int ret = pthread_mutex_unlock((pthread_mutex_t *) mutex); int ret = pthread_mutex_unlock((pthread_mutex_t *) mutex);
if (ret) janet_panic("cannot release lock"); if (ret) janet_panicf("cannot release lock: %s", strerror(ret));
} }
void janet_os_rwlock_init(JanetOSRWLock *rwlock) { void janet_os_rwlock_init(JanetOSRWLock *rwlock) {

8
src/core/gc.c
View File

@ -364,20 +364,22 @@ void janet_sweep() {
/* If not visited... */ /* If not visited... */
if (!janet_truthy(items[i].value)) { if (!janet_truthy(items[i].value)) {
void *abst = janet_unwrap_abstract(items[i].key); void *abst = janet_unwrap_abstract(items[i].key);
if (0 == janet_abstract_decref(abst)) { if (0 == janet_abstract_decref(abst)) {
/* Run finalizer */ /* Run finalizer */
JanetAbstractHead *head = janet_abstract_head(abst); JanetAbstractHead *head = janet_abstract_head(abst);
if (head->type->gc) { if (head->type->gc) {
janet_assert(!head->type->gc(head->data, head->size), "finalizer failed"); janet_assert(!head->type->gc(head->data, head->size), "finalizer failed");
} }
/* Free memory */
janet_free(janet_abstract_head(abst));
}
/* Mark as tombstone in place */ /* Mark as tombstone in place */
items[i].key = janet_wrap_nil(); items[i].key = janet_wrap_nil();
items[i].value = janet_wrap_false(); items[i].value = janet_wrap_false();
janet_vm.threaded_abstracts.deleted++; janet_vm.threaded_abstracts.deleted++;
janet_vm.threaded_abstracts.count--; janet_vm.threaded_abstracts.count--;
/* Free memory */
janet_free(janet_abstract_head(abst));
}
} }
/* Reset for next sweep */ /* Reset for next sweep */