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ad 2020-01-30 12:36:38 +00:00
parent da84a45c44
commit c36937211e
1 changed files with 12 additions and 6 deletions
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18
sys/kern/sys_lwp.c
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@ -1,4 +1,4 @@
/* $NetBSD: sys_lwp.c,v 1.74 2020/01/29 15:47:52 ad Exp $ */
/* $NetBSD: sys_lwp.c,v 1.75 2020/01/30 12:36:38 ad Exp $ */
/*-
* Copyright (c) 2001, 2006, 2007, 2008, 2019, 2020 The NetBSD Foundation, Inc.
@ -35,7 +35,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sys_lwp.c,v 1.74 2020/01/29 15:47:52 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: sys_lwp.c,v 1.75 2020/01/30 12:36:38 ad Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -480,15 +480,21 @@ lwp_unpark(const lwpid_t *tp, const u_int ntargets)
continue;
}
/* It may not have parked yet or we may have raced. */
lwp_lock(t);
if (t->l_syncobj == &lwp_park_syncobj) {
/* Releases the LWP lock. */
/*
* As expected it's parked, so wake it up.
* lwp_unsleep() will release the LWP lock.
*/
lwp_unsleep(t, true);
} else {
/*
* Set the operation pending. The next call to
* _lwp_park() will return early.
* It hasn't parked yet because the wakeup side won
* the race, or something else has happened to make
* the thread not park. Why doesn't really matter.
* Set the operation pending, so that the next call
* to _lwp_park() in the LWP returns early. If it
* turns out to be a spurious wakeup, no harm done.
*/
t->l_flag |= LW_UNPARKED;
lwp_unlock(t);