include/sys/zfs_delay.h

   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 http://www.opensolaris.org/os/licensing.
  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 */