[src/trunk]: src/sys/kern Allow machine dependent code to specify a hook to b...

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

details:   https://anonhg.NetBSD.org/src/rev/92425159e086
branches:  trunk
changeset: 499464:92425159e086
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Mon Nov 20 20:04:49 2000 +0000

description:
Allow machine dependent code to specify a hook to be run when a
spinlock's interlock is released.

Idea from Bill Sommerfeld.

diffstat:

 sys/kern/kern_lock.c |  10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diffs (32 lines):

diff -r c29a1ac42f04 -r 92425159e086 sys/kern/kern_lock.c
--- a/sys/kern/kern_lock.c      Mon Nov 20 19:53:43 2000 +0000
+++ b/sys/kern/kern_lock.c      Mon Nov 20 20:04:49 2000 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_lock.c,v 1.48 2000/08/28 21:07:52 sommerfeld Exp $        */
+/*     $NetBSD: kern_lock.c,v 1.49 2000/11/20 20:04:49 thorpej Exp $   */
 
 /*-
  * Copyright (c) 1999, 2000 The NetBSD Foundation, Inc.
@@ -130,6 +130,10 @@
 #define COUNT_CPU(cpu_id, x)
 #endif /* LOCKDEBUG || DIAGNOSTIC */ /* } */
 
+#ifndef SPINLOCK_INTERLOCK_RELEASE_HOOK                /* from <machine/lock.h> */
+#define        SPINLOCK_INTERLOCK_RELEASE_HOOK         /* nothing */
+#endif
+
 #define        INTERLOCK_ACQUIRE(lkp, flags, s)                                \
 do {                                                                   \
        if ((flags) & LK_SPIN)                                          \
@@ -140,8 +144,10 @@
 #define        INTERLOCK_RELEASE(lkp, flags, s)                                \
 do {                                                                   \
        simple_unlock(&(lkp)->lk_interlock);                            \
-       if ((flags) & LK_SPIN)                                          \
+       if ((flags) & LK_SPIN) {                                        \
                splx(s);                                                \
+               SPINLOCK_INTERLOCK_RELEASE_HOOK;                        \
+       }                                                               \
 } while (0)
 
 /*