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Document cv_has_waiters().

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ad 2007-02-03 16:49:11 +00:00
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commit 26d6ccf325
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share/man/man9/condvar.9
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@ -1,4 +1,4 @@
.\" $NetBSD: condvar.9,v 1.6 2007/02/03 16:39:53 ad Exp $
.\" $NetBSD: condvar.9,v 1.7 2007/02/03 16:49:11 ad Exp $
.\"
.\" Copyright (c) 2006, 2007 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -49,7 +49,8 @@
.Nm cv_signal ,
.Nm cv_broadcast ,
.Nm cv_signal_async ,
.Nm cv_broadcast_async
.Nm cv_broadcast_async ,
.Nm cv_has_waiters
.Nd condition variables
.Sh SYNOPSIS
.In sys/condvar.h
@ -73,6 +74,8 @@
.Fn cv_signal_async "kcondvar_t *cv"
.Ft void
.Fn cv_broadcast_async "kcondvar_t *cv"
.Ft int
.Fn cv_has_waiters "kcondvar_t *cv"
.Sh DESCRIPTION
Condition variables (CVs) are used in the kernel to synchronize access
to resources that are limited (for example, memory) and to wait for
@ -209,6 +212,12 @@ but the interlock
.Po Fa mtx Pc
need not be held.
Use of these methods is discouraged as they are more costly to execute.
.It Fn cv_has_waiters "cv"
.Pp
Return non-zero if one or more LWPs are waiting on the specified condition
variable.
.Fn cv_has_waiters
should only be used when making diagnostic assertions.
.El
.Sh EXAMPLES
.Bd -literal