| /* |
| * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org> |
| * Copyright (c) 2013 iXsystems, Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * $FreeBSD$ |
| */ |
| |
| #ifndef _OPENSOLARIS_SYS_CONDVAR_H_ |
| #define _OPENSOLARIS_SYS_CONDVAR_H_ |
| |
| #include <sys/param.h> |
| #include <sys/systm.h> |
| |
| #include <sys/spl_condvar.h> |
| #include <sys/mutex.h> |
| #include <sys/time.h> |
| #include <sys/errno.h> |
| |
| /* |
| * cv_timedwait() is similar to cv_wait() except that it additionally expects |
| * a timeout value specified in ticks. When woken by cv_signal() or |
| * cv_broadcast() it returns 1, otherwise when the timeout is reached -1 is |
| * returned. |
| * |
| * cv_timedwait_sig() behaves the same as cv_timedwait() but blocks |
| * interruptibly and can be woken by a signal (EINTR, ERESTART). When |
| * this occurs 0 is returned. |
| * |
| * cv_timedwait_io() and cv_timedwait_sig_io() are variants of cv_timedwait() |
| * and cv_timedwait_sig() which should be used when waiting for outstanding |
| * IO to complete. They are responsible for updating the iowait accounting |
| * when this is supported by the platform. |
| * |
| * cv_timedwait_hires() and cv_timedwait_sig_hires() are high resolution |
| * versions of cv_timedwait() and cv_timedwait_sig(). They expect the timeout |
| * to be specified as a hrtime_t allowing for timeouts of less than a tick. |
| * |
| * N.B. The return values differ slightly from the illumos implementation |
| * which returns the time remaining, instead of 1, when woken. They both |
| * return -1 on timeout. Consumers which need to know the time remaining |
| * are responsible for tracking it themselves. |
| */ |
| |
| static __inline sbintime_t |
| zfs_nstosbt(int64_t _ns) |
| { |
| sbintime_t sb = 0; |
| |
| #ifdef KASSERT |
| KASSERT(_ns >= 0, ("Negative values illegal for nstosbt: %jd", _ns)); |
| #endif |
| if (_ns >= SBT_1S) { |
| sb = (_ns / 1000000000) * SBT_1S; |
| _ns = _ns % 1000000000; |
| } |
| /* 9223372037 = ceil(2^63 / 1000000000) */ |
| sb += ((_ns * 9223372037ull) + 0x7fffffff) >> 31; |
| return (sb); |
| } |
| |
| |
| typedef struct cv kcondvar_t; |
| #define CALLOUT_FLAG_ABSOLUTE C_ABSOLUTE |
| |
| typedef enum { |
| CV_DEFAULT, |
| CV_DRIVER |
| } kcv_type_t; |
| |
| #define zfs_cv_init(cv, name, type, arg) do { \ |
| const char *_name; \ |
| ASSERT((type) == CV_DEFAULT); \ |
| for (_name = #cv; *_name != '\0'; _name++) { \ |
| if (*_name >= 'a' && *_name <= 'z') \ |
| break; \ |
| } \ |
| if (*_name == '\0') \ |
| _name = #cv; \ |
| cv_init((cv), _name); \ |
| } while (0) |
| #define cv_init(cv, name, type, arg) zfs_cv_init(cv, name, type, arg) |
| |
| |
| static inline int |
| cv_wait_sig(kcondvar_t *cvp, kmutex_t *mp) |
| { |
| |
| return (_cv_wait_sig(cvp, &(mp)->lock_object) == 0); |
| } |
| |
| static inline int |
| cv_timedwait(kcondvar_t *cvp, kmutex_t *mp, clock_t timo) |
| { |
| int rc; |
| |
| timo -= ddi_get_lbolt(); |
| if (timo <= 0) |
| return (-1); |
| rc = _cv_timedwait_sbt((cvp), &(mp)->lock_object, \ |
| tick_sbt * (timo), 0, C_HARDCLOCK); |
| if (rc == EWOULDBLOCK) |
| return (-1); |
| return (1); |
| } |
| |
| static inline int |
| cv_timedwait_sig(kcondvar_t *cvp, kmutex_t *mp, clock_t timo) |
| { |
| int rc; |
| |
| timo -= ddi_get_lbolt(); |
| if (timo <= 0) |
| return (-1); |
| rc = _cv_timedwait_sig_sbt(cvp, &(mp)->lock_object, \ |
| tick_sbt * (timo), 0, C_HARDCLOCK); |
| if (rc == EWOULDBLOCK) |
| return (-1); |
| if (rc == EINTR || rc == ERESTART) |
| return (0); |
| |
| return (1); |
| } |
| |
| #define cv_timedwait_io cv_timedwait |
| #define cv_timedwait_idle cv_timedwait |
| #define cv_timedwait_sig_io cv_timedwait_sig |
| #define cv_wait_io cv_wait |
| #define cv_wait_io_sig cv_wait_sig |
| #define cv_wait_idle cv_wait |
| #define cv_timedwait_io_hires cv_timedwait_hires |
| #define cv_timedwait_idle_hires cv_timedwait_hires |
| |
| static inline int |
| cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t tim, hrtime_t res, |
| int flag) |
| { |
| hrtime_t hrtime; |
| int rc; |
| |
| ASSERT(tim >= res); |
| |
| hrtime = gethrtime(); |
| if (flag == 0) |
| tim += hrtime; |
| |
| if (hrtime >= tim) |
| return (-1); |
| rc = cv_timedwait_sbt(cvp, mp, zfs_nstosbt(tim), |
| zfs_nstosbt(res), C_ABSOLUTE); |
| |
| if (rc == EWOULDBLOCK) |
| return (-1); |
| |
| KASSERT(rc == 0, ("unexpected rc value %d", rc)); |
| return (1); |
| } |
| |
| static inline int |
| cv_timedwait_sig_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t tim, |
| hrtime_t res, int flag) |
| { |
| sbintime_t sbt; |
| hrtime_t hrtime; |
| int rc; |
| |
| ASSERT(tim >= res); |
| |
| hrtime = gethrtime(); |
| if (flag == 0) |
| tim += hrtime; |
| |
| if (hrtime >= tim) |
| return (-1); |
| |
| sbt = zfs_nstosbt(tim); |
| rc = cv_timedwait_sig_sbt(cvp, mp, sbt, zfs_nstosbt(res), C_ABSOLUTE); |
| |
| switch (rc) { |
| case EWOULDBLOCK: |
| return (-1); |
| case EINTR: |
| case ERESTART: |
| return (0); |
| default: |
| KASSERT(rc == 0, ("unexpected rc value %d", rc)); |
| return (1); |
| } |
| } |
| |
| #endif /* _OPENSOLARIS_SYS_CONDVAR_H_ */ |