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Add a section about locking within the extent manager.

This commit is contained in:
thorpej 1998-06-06 02:32:28 +00:00
parent 618c279d16
commit 9ebbfc77a5
1 changed files with 8 additions and 2 deletions
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10
share/man/man9/extent.9
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@ -1,6 +1,6 @@
.\" $NetBSD: extent.9,v 1.9 1998/02/06 06:16:22 perry Exp $
.\" $NetBSD: extent.9,v 1.10 1998/06/06 02:32:28 thorpej Exp $
.\"
.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
.\" Copyright (c) 1996, 1998 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
@ -239,6 +239,12 @@ Print out information about extent
.Fa ex .
This function always succeeds. Behavior is undefined if invalid
arguments are provided.
.Sh LOCKING
The extent manager performs all necessary locking on the extent map
itself, and any other data structures internal to the extent manager.
The locks used by the extent manager are spin locks, and will never sleep.
This should be taken into account when designing the locking protocol
for users of the extent manager.
.Sh RETURN VALUES
The behavior of all extent manager functions is undefined if given
invalid arguments.