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WIP: remove locking from GC collector's trace

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This commit is contained in:
Justin Ethier 2018-06-11 18:58:33 -04:00
parent f9fa7d9214
commit 74d53eb334
1 changed files with 4 additions and 4 deletions
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8
gc.c
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@ -1836,7 +1836,7 @@ void gc_collector_trace()
CK_ARRAY_FOREACH(&Cyc_mutators, &iterator, &m) {
// TODO: ideally, want to use a lock-free data structure to prevent
// having to use a mutex here. see corresponding code in gc_mark_gray
pthread_mutex_lock(&(m->lock));
//pthread_mutex_lock(&(m->lock));
while (m->last_read < m->last_write) {
clean = 0;
#if GC_DEBUG_VERBOSE
@ -1848,13 +1848,13 @@ void gc_collector_trace()
gc_empty_collector_stack();
(m->last_read)++; // Inc here to prevent off-by-one error
}
pthread_mutex_unlock(&(m->lock));
//pthread_mutex_unlock(&(m->lock));
// Try checking the condition once more after giving the
// mutator a chance to respond, to prevent exiting early.
// This is experimental, not sure if it is necessary
if (clean) {
pthread_mutex_lock(&(m->lock));
//pthread_mutex_lock(&(m->lock));
if (m->last_read < m->last_write) {
#if GC_SAFETY_CHECKS
fprintf(stderr,
@ -1864,7 +1864,7 @@ void gc_collector_trace()
} else if (m->pending_writes) {
clean = 0;
}
pthread_mutex_unlock(&(m->lock));
//pthread_mutex_unlock(&(m->lock));
}
}
}