Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

sa_upcall_userret: yield cpu on stack starvation so that it's 

killable at least.  PR/28612 from ITOH Yasufumi.
This commit is contained in:
yamt 2006-05-25 14:13:29 +00:00
parent 1e545a5a2b
commit 67c564ace6
1 changed files with 10 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
sys/kern/kern_sa.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: kern_sa.c,v 1.72 2006/04/13 18:55:49 christos Exp $ */
/* $NetBSD: kern_sa.c,v 1.73 2006/05/25 14:13:29 yamt Exp $ */
/*-
* Copyright (c) 2001, 2004, 2005 The NetBSD Foundation, Inc.
@ -39,7 +39,7 @@
#include <sys/cdefs.h>
#include "opt_ktrace.h"
__KERNEL_RCSID(0, "$NetBSD: kern_sa.c,v 1.72 2006/04/13 18:55:49 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_sa.c,v 1.73 2006/05/25 14:13:29 yamt Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -1290,8 +1290,15 @@ sa_upcall_userret(struct lwp *l)
KDASSERT((l->l_flag & L_SA_BLOCKING) == 0);
sast = NULL;
if (SIMPLEQ_EMPTY(&vp->savp_upcalls) && vp->savp_wokenq_head != NULL)
if (SIMPLEQ_EMPTY(&vp->savp_upcalls) && vp->savp_wokenq_head != NULL) {
sast = sa_getstack(sa);
if (sast == NULL) {
SA_LWP_STATE_UNLOCK(l, f);
KERNEL_PROC_UNLOCK(l);
preempt(1);
return;
}
}
SCHED_LOCK(s);
if (SIMPLEQ_EMPTY(&vp->savp_upcalls) && vp->savp_wokenq_head != NULL &&
sast != NULL) {