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Adjust memory barriers.

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This commit is contained in:
ad 2020-06-11 18:41:22 +00:00
parent 378e0318d0
commit 2b4d53924f
1 changed files with 6 additions and 3 deletions
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9
lib/libpthread/pthread_mutex.c
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@ -1,4 +1,4 @@
/* $NetBSD: pthread_mutex.c,v 1.80 2020/06/10 22:45:15 ad Exp $ */
/* $NetBSD: pthread_mutex.c,v 1.81 2020/06/11 18:41:22 ad Exp $ */
/*-
* Copyright (c) 2001, 2003, 2006, 2007, 2008, 2020 The NetBSD Foundation, Inc.
@ -47,7 +47,7 @@
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: pthread_mutex.c,v 1.80 2020/06/10 22:45:15 ad Exp $");
__RCSID("$NetBSD: pthread_mutex.c,v 1.81 2020/06/11 18:41:22 ad Exp $");
#include <sys/types.h>
#include <sys/lwpctl.h>
@ -532,7 +532,7 @@ pthread__mutex_wakeup(pthread_t self, struct pthread__waiter *cur)
next = cur->next;
pthread__assert(cur->lid != 0);
lids[nlid++] = cur->lid;
membar_sync();
membar_exit();
cur->lid = 0;
/* No longer safe to touch 'cur' */
}
@ -719,6 +719,9 @@ pthread__mutex_deferwake(pthread_t self, pthread_mutex_t *ptm,
/* Append atomically. */
for (o = ptm->ptm_waiters;; o = n) {
tail->next = o;
#ifndef PTHREAD__ATOMIC_IS_MEMBAR
membar_producer();
#endif
n = atomic_cas_ptr(&ptm->ptm_waiters, o, head);
if (__predict_true(n == o)) {
break;