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0a00804585
Sponsored-by: https://despairlabs.com/sponsor/ Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de> Signed-off-by: Rob Norris <robn@despairlabs.com> Closes #16479
120 lines
4.7 KiB
C
120 lines
4.7 KiB
C
/*
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _SPL_CONDVAR_H
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#define _SPL_CONDVAR_H
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#include <linux/module.h>
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#include <sys/kmem.h>
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#include <sys/mutex.h>
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#include <sys/callo.h>
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#include <sys/wait.h>
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#include <sys/time.h>
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/*
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* cv_timedwait() is similar to cv_wait() except that it additionally expects
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* a timeout value specified in ticks. When woken by cv_signal() or
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* cv_broadcast() it returns 1, otherwise when the timeout is reached -1 is
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* returned.
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*
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* cv_timedwait_sig() behaves the same as cv_timedwait() but blocks
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* interruptibly and can be woken by a signal (EINTR, ERESTART). When
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* this occurs 0 is returned.
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*
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* cv_timedwait_io() and cv_timedwait_sig_io() are variants of cv_timedwait()
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* and cv_timedwait_sig() which should be used when waiting for outstanding
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* IO to complete. They are responsible for updating the iowait accounting
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* when this is supported by the platform.
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*
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* cv_timedwait_hires() and cv_timedwait_sig_hires() are high resolution
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* versions of cv_timedwait() and cv_timedwait_sig(). They expect the timeout
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* to be specified as a hrtime_t allowing for timeouts of less than a tick.
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*
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* N.B. The return values differ slightly from the illumos implementation
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* which returns the time remaining, instead of 1, when woken. They both
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* return -1 on timeout. Consumers which need to know the time remaining
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* are responsible for tracking it themselves.
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*/
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/*
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* The kcondvar_t struct is protected by mutex taken externally before
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* calling any of the wait/signal funs, and passed into the wait funs.
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*/
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#define CV_MAGIC 0x346545f4
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#define CV_DESTROY 0x346545f5
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typedef struct {
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int cv_magic;
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wait_queue_head_t cv_event;
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wait_queue_head_t cv_destroy;
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atomic_t cv_refs;
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atomic_t cv_waiters;
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kmutex_t *cv_mutex;
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} kcondvar_t;
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typedef enum { CV_DEFAULT = 0, CV_DRIVER } kcv_type_t;
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extern void __cv_init(kcondvar_t *, char *, kcv_type_t, void *);
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extern void __cv_destroy(kcondvar_t *);
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extern void __cv_wait(kcondvar_t *, kmutex_t *);
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extern void __cv_wait_io(kcondvar_t *, kmutex_t *);
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extern void __cv_wait_idle(kcondvar_t *, kmutex_t *);
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extern int __cv_wait_io_sig(kcondvar_t *, kmutex_t *);
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extern int __cv_wait_sig(kcondvar_t *, kmutex_t *);
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extern int __cv_timedwait(kcondvar_t *, kmutex_t *, clock_t);
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extern int __cv_timedwait_io(kcondvar_t *, kmutex_t *, clock_t);
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extern int __cv_timedwait_sig(kcondvar_t *, kmutex_t *, clock_t);
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extern int __cv_timedwait_idle(kcondvar_t *, kmutex_t *, clock_t);
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extern int cv_timedwait_hires(kcondvar_t *, kmutex_t *, hrtime_t,
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hrtime_t res, int flag);
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extern int cv_timedwait_sig_hires(kcondvar_t *, kmutex_t *, hrtime_t,
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hrtime_t res, int flag);
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extern int cv_timedwait_idle_hires(kcondvar_t *, kmutex_t *, hrtime_t,
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hrtime_t res, int flag);
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extern void __cv_signal(kcondvar_t *);
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extern void __cv_broadcast(kcondvar_t *c);
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#define cv_init(cvp, name, type, arg) __cv_init(cvp, name, type, arg)
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#define cv_destroy(cvp) __cv_destroy(cvp)
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#define cv_wait(cvp, mp) __cv_wait(cvp, mp)
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#define cv_wait_io(cvp, mp) __cv_wait_io(cvp, mp)
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#define cv_wait_idle(cvp, mp) __cv_wait_idle(cvp, mp)
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#define cv_wait_io_sig(cvp, mp) __cv_wait_io_sig(cvp, mp)
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#define cv_wait_sig(cvp, mp) __cv_wait_sig(cvp, mp)
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#define cv_signal(cvp) __cv_signal(cvp)
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#define cv_broadcast(cvp) __cv_broadcast(cvp)
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/*
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* NB: There is no way to reliably distinguish between having been signalled
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* and having timed out on Linux. If the client code needs to reliably
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* distinguish between the two it should use the hires variant.
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*/
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#define cv_timedwait(cvp, mp, t) __cv_timedwait(cvp, mp, t)
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#define cv_timedwait_io(cvp, mp, t) __cv_timedwait_io(cvp, mp, t)
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#define cv_timedwait_sig(cvp, mp, t) __cv_timedwait_sig(cvp, mp, t)
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#define cv_timedwait_idle(cvp, mp, t) __cv_timedwait_idle(cvp, mp, t)
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#endif /* _SPL_CONDVAR_H */
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