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More conservative locking when collector cooperates

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Try to prevent cases where the mutator and collector are both running minor GC at the same time.
This commit is contained in:
Justin Ethier 2016-03-04 21:58:31 -05:00
parent 109d94db59
commit 23fd4268a3
1 changed files with 2 additions and 2 deletions
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4
gc.c
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@ -1112,6 +1112,7 @@ void gc_wait_handshake()
ck_pr_cas_int(&(m->gc_status), statusm, statusc);
} else if (statusm == STATUS_SYNC2) {
//printf("DEBUG - is mutator still blocked?\n");
pthread_mutex_lock(&(m->lock));
// Check again, if thread is still blocked we need to cooperate
if (ck_pr_cas_int((int *)&(m->thread_state),
CYC_THREAD_STATE_BLOCKED,
@ -1123,7 +1124,6 @@ void gc_wait_handshake()
) {
//printf("DEBUG - update mutator GC status\n");
ck_pr_cas_int(&(m->gc_status), statusm, statusc);
pthread_mutex_lock(&(m->lock));
//printf("DEBUG - collector is cooperating for blocked mutator\n");
buf_len = gc_minor(m, m->stack_limit, m->stack_start, m->gc_cont, NULL, 0);
// Handle any pending marks from write barrier
@ -1138,8 +1138,8 @@ void gc_wait_handshake()
gc_mark_gray(m, m->moveBuf[i]);
}
m->gc_alloc_color = ck_pr_load_int(&gc_color_mark);
pthread_mutex_unlock(&(m->lock));
}
pthread_mutex_unlock(&(m->lock));
}
} else if (thread_status == CYC_THREAD_STATE_TERMINATED) {
// Thread is no longer running