1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or https://opensource.org/licenses/CDDL-1.0.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 #ifndef	_SYS_FS_ZFS_DELAY_H
23 #define	_SYS_FS_ZFS_DELAY_H
24 
25 #include <sys/timer.h>
26 
27 /*
28  * Generic wrapper to sleep until a given time.
29  */
30 #define	zfs_sleep_until(wakeup)						\
31 	do {								\
32 		hrtime_t delta = wakeup - gethrtime();			\
33 									\
34 		if (delta > 0) {					\
35 			unsigned long delta_us;				\
36 			delta_us = delta / (NANOSEC / MICROSEC);	\
37 			usleep_range(delta_us, delta_us + 100);		\
38 		}							\
39 	} while (0)
40 
41 #endif	/* _SYS_FS_ZFS_DELAY_H */
42