Module Name: src
Committed By: joerg
Date: Sun Nov 10 23:39:03 UTC 2019
Modified Files:
src/sys/kern: kern_lwp.c
Log Message:
Ensure that the second LWP of a new process uses a free LWP ID.
Document overflow behavior.
To generate a diff of this commit:
cvs rdiff -u -r1.206 -r1.207 src/sys/kern/kern_lwp.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/kern/kern_lwp.c
diff -u src/sys/kern/kern_lwp.c:1.206 src/sys/kern/kern_lwp.c:1.207
--- src/sys/kern/kern_lwp.c:1.206 Thu Nov 7 19:45:18 2019
+++ src/sys/kern/kern_lwp.c Sun Nov 10 23:39:03 2019
@@ -1,4 +1,4 @@
-/* $NetBSD: kern_lwp.c,v 1.206 2019/11/07 19:45:18 joerg Exp $ */
+/* $NetBSD: kern_lwp.c,v 1.207 2019/11/10 23:39:03 joerg Exp $ */
/*-
* Copyright (c) 2001, 2006, 2007, 2008, 2009 The NetBSD Foundation, Inc.
@@ -211,7 +211,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_lwp.c,v 1.206 2019/11/07 19:45:18 joerg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_lwp.c,v 1.207 2019/11/10 23:39:03 joerg Exp $");
#include "opt_ddb.h"
#include "opt_lockdebug.h"
@@ -904,6 +904,11 @@ lwp_create(lwp_t *l1, proc_t *p2, vaddr_
l2->l_pflag |= LP_PIDLID;
} else if (p2->p_nlwps == 0) {
lid = l1->l_lid;
+ /*
+ * Update next LWP ID, too. If this overflows to LID_SCAN,
+ * the slow path of scanning will be used for the next LWP.
+ */
+ p2->p_nlwpid = lid + 1;
} else {
lid = 0;
}
