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Add comments saying that a cv_timedwait and sleepq_block interpret 

timo = 0 as an infinite timeout.  This is already documented in the
cv_timedwait(9) man page, and there is no sleeq_block(9) man page.
This commit is contained in:
apb 2013-03-08 08:35:09 +00:00
parent 2b38e53a58
commit e6dad85522
2 changed files with 8 additions and 4 deletions
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6
sys/kern/kern_condvar.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: kern_condvar.c,v 1.30 2011/07/27 14:35:33 uebayasi Exp $ */
/* $NetBSD: kern_condvar.c,v 1.31 2013/03/08 08:35:09 apb Exp $ */
/*-
* Copyright (c) 2006, 2007, 2008 The NetBSD Foundation, Inc.
@ -34,7 +34,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_condvar.c,v 1.30 2011/07/27 14:35:33 uebayasi Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_condvar.c,v 1.31 2013/03/08 08:35:09 apb Exp $");
#include <sys/param.h>
#include <sys/proc.h>
@ -244,6 +244,8 @@ cv_wait_sig(kcondvar_t *cv, kmutex_t *mtx)
* Wait on a condition variable until awoken or the specified timeout
* expires. Returns zero if awoken normally or EWOULDBLOCK if the
* timeout expired.
*
* timo is a timeout in ticks. timo = 0 specifies an infinite timeout.
*/
int
cv_timedwait(kcondvar_t *cv, kmutex_t *mtx, int timo)

6
sys/kern/kern_sleepq.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: kern_sleepq.c,v 1.47 2012/07/27 05:36:13 matt Exp $ */
/* $NetBSD: kern_sleepq.c,v 1.48 2013/03/08 08:35:09 apb Exp $ */
/*-
* Copyright (c) 2006, 2007, 2008, 2009 The NetBSD Foundation, Inc.
@ -35,7 +35,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_sleepq.c,v 1.47 2012/07/27 05:36:13 matt Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_sleepq.c,v 1.48 2013/03/08 08:35:09 apb Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
@ -226,6 +226,8 @@ sleepq_enqueue(sleepq_t *sq, wchan_t wchan, const char *wmesg, syncobj_t *sobj)
* After any intermediate step such as releasing an interlock, switch.
* sleepq_block() may return early under exceptional conditions, for
* example if the LWP's containing process is exiting.
*
* timo is a timeout in ticks. timo = 0 specifies an infinite timeout.
*/
int
sleepq_block(int timo, bool catch)