Add tsleep_nsec(9), msleep_nsec(9), and rwsleep_nsec(9).

Equivalent to their unsuffixed counterparts except that (a) they take
a timeout in terms of nanoseconds, and (b) INFSLP, aka UINT64_MAX (not
zero) indicates that a timeout should not be set.

For now, zero nanoseconds is not a strictly valid invocation: we log a
warning on DIAGNOSTIC kernels if we see such a call.  We still sleep
until the next tick in such a case, however.  In the future this could
become some sort of poll... TBD.

To facilitate conversions to these interfaces: add inline conversion
functions to sys/time.h for turning your timeout into nanoseconds.

Also do a few easy conversions for warmup and to demonstrate how
further conversions should be done.

Lots of input from mpi@ and ratchov@.  Additional input from tedu@,
deraadt@, mortimer@, millert@, and claudio@.

Partly inspired by FreeBSD r247787.

positive feedback from deraadt@, ok mpi@

1 files changed, 3 insertions, 3 deletions

diff --git a/sys/kern/kern_acct.c b/sys/kern/kern_acct.c
index 3bf3ae26c9a..db8494f292d 100644
--- a/sys/kern/kern_acct.c
+++ b/sys/kern/kern_acct.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: kern_acct.c,v 1.38 2019/06/01 14:11:17 mpi Exp $	*/
+/*	$OpenBSD: kern_acct.c,v 1.39 2019/07/03 22:39:33 cheloha Exp $	*/
 /*	$NetBSD: kern_acct.c,v 1.42 1996/02/04 02:15:12 christos Exp $	*/
 
 /*-
@@ -86,7 +86,7 @@ struct	vnode *savacctp;
  */
 int	acctsuspend = 2;	/* stop accounting when < 2% free space left */
 int	acctresume = 4;		/* resume when free space risen to > 4% */
-int	acctchkfreq = 15;	/* frequency (in seconds) to check space */
+int	acctrate = 15;		/* delay (in seconds) between space checks */
 
 struct proc *acct_proc;
 
@@ -313,7 +313,7 @@ acct_thread(void *arg)
 		} else {
 			break;
 		}
-		tsleep(&acct_proc, PPAUSE, "acct", acctchkfreq *hz);
+		tsleep_nsec(&acct_proc, PPAUSE, "acct", SEC_TO_NSEC(acctrate));
 	}
 	acct_proc = NULL;
 	kthread_exit(0);