[src/trunk]: src/sys Add SOBJ_SLEEPQ_NULL: means there is no TAILQ and the ca...

[ad <ad%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/7e6cf0f2aea6
branches:  trunk
changeset: 744181:7e6cf0f2aea6
user:      ad <ad%NetBSD.org@localhost>
date:      Sun Jan 26 19:01:56 2020 +0000

description:
Add SOBJ_SLEEPQ_NULL: means there is no TAILQ and the caller tracks the
sleeping LWPs some other way, which sleepq_*() doesn't know about.

diffstat:

 sys/kern/kern_sleepq.c |  22 +++++++++++++++++-----
 sys/sys/syncobj.h      |   6 ++++--
 2 files changed, 21 insertions(+), 7 deletions(-)

diffs (86 lines):

diff -r b877f7e118b5 -r 7e6cf0f2aea6 sys/kern/kern_sleepq.c
--- a/sys/kern/kern_sleepq.c    Sun Jan 26 18:52:55 2020 +0000
+++ b/sys/kern/kern_sleepq.c    Sun Jan 26 19:01:56 2020 +0000
@@ -1,7 +1,7 @@
-/*     $NetBSD: kern_sleepq.c,v 1.58 2020/01/12 13:08:32 ad Exp $      */
+/*     $NetBSD: kern_sleepq.c,v 1.59 2020/01/26 19:01:56 ad Exp $      */
 
 /*-
- * Copyright (c) 2006, 2007, 2008, 2009, 2019 The NetBSD Foundation, Inc.
+ * Copyright (c) 2006, 2007, 2008, 2009, 2019, 2020 The NetBSD Foundation, Inc.
  * All rights reserved.
  *
  * This code is derived from software contributed to The NetBSD Foundation
@@ -35,7 +35,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_sleepq.c,v 1.58 2020/01/12 13:08:32 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_sleepq.c,v 1.59 2020/01/26 19:01:56 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/kernel.h>
@@ -114,7 +114,13 @@
 
        KASSERT(lwp_locked(l, NULL));
 
-       TAILQ_REMOVE(sq, l, l_sleepchain);
+       if ((l->l_syncobj->sobj_flag & SOBJ_SLEEPQ_NULL) == 0) {
+               KASSERT(sq != NULL);
+               TAILQ_REMOVE(sq, l, l_sleepchain);
+       } else {
+               KASSERT(sq == NULL);
+       }
+
        l->l_syncobj = &sched_syncobj;
        l->l_wchan = NULL;
        l->l_sleepq = NULL;
@@ -175,6 +181,12 @@
 sleepq_insert(sleepq_t *sq, lwp_t *l, syncobj_t *sobj)
 {
 
+       if ((sobj->sobj_flag & SOBJ_SLEEPQ_NULL) != 0) {
+               KASSERT(sq == NULL); 
+               return;
+       }
+       KASSERT(sq != NULL);
+
        if ((sobj->sobj_flag & SOBJ_SLEEPQ_SORTED) != 0) {
                lwp_t *l2;
                const int pri = lwp_eprio(l);
@@ -441,7 +453,7 @@
 {
 
        KASSERT(l->l_sleepq == sq);
-       if ((l->l_syncobj->sobj_flag & SOBJ_SLEEPQ_SORTED) == 0) {
+       if ((l->l_syncobj->sobj_flag & SOBJ_SLEEPQ_SORTED) == 0) { 
                return;
        }
 
diff -r b877f7e118b5 -r 7e6cf0f2aea6 sys/sys/syncobj.h
--- a/sys/sys/syncobj.h Sun Jan 26 18:52:55 2020 +0000
+++ b/sys/sys/syncobj.h Sun Jan 26 19:01:56 2020 +0000
@@ -1,7 +1,7 @@
-/*     $NetBSD: syncobj.h,v 1.8 2009/10/21 21:12:07 rmind Exp $        */
+/*     $NetBSD: syncobj.h,v 1.9 2020/01/26 19:01:56 ad Exp $   */
 
 /*-
- * Copyright (c) 2007, 2008 The NetBSD Foundation, Inc.
+ * Copyright (c) 2007, 2008, 2020 The NetBSD Foundation, Inc.
  * All rights reserved.
  *
  * This code is derived from software contributed to The NetBSD Foundation
@@ -54,11 +54,13 @@
 #define        SOBJ_SLEEPQ_SORTED      0x01
 #define        SOBJ_SLEEPQ_FIFO        0x02
 #define        SOBJ_SLEEPQ_LIFO        0x04
+#define        SOBJ_SLEEPQ_NULL        0x08
 
 extern syncobj_t       sched_syncobj;
 extern syncobj_t       mutex_syncobj;
 extern syncobj_t       rw_syncobj;
 extern syncobj_t       sleep_syncobj;
+extern syncobj_t       lwp_park_syncobj;
 
 #endif /* defined(_KERNEL) */