90 строки
2.9 KiB
C
90 строки
2.9 KiB
C
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/*
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* Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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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 this program; if not, write the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
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* Mountain View, CA 94043, or:
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*
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* http://www.sgi.com
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*
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* For further information regarding this notice, see:
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*
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* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
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*/
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#ifndef __XFS_SUPPORT_SV_H__
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#define __XFS_SUPPORT_SV_H__
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#include <linux/wait.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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/*
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* Synchronisation variables.
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*
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* (Parameters "pri", "svf" and "rts" are not implemented)
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*/
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typedef struct sv_s {
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wait_queue_head_t waiters;
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} sv_t;
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#define SV_FIFO 0x0 /* sv_t is FIFO type */
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#define SV_LIFO 0x2 /* sv_t is LIFO type */
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#define SV_PRIO 0x4 /* sv_t is PRIO type */
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#define SV_KEYED 0x6 /* sv_t is KEYED type */
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#define SV_DEFAULT SV_FIFO
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static inline void _sv_wait(sv_t *sv, spinlock_t *lock, int state,
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unsigned long timeout)
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{
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DECLARE_WAITQUEUE(wait, current);
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add_wait_queue_exclusive(&sv->waiters, &wait);
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__set_current_state(state);
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spin_unlock(lock);
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schedule_timeout(timeout);
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remove_wait_queue(&sv->waiters, &wait);
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}
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#define init_sv(sv,type,name,flag) \
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init_waitqueue_head(&(sv)->waiters)
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#define sv_init(sv,flag,name) \
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init_waitqueue_head(&(sv)->waiters)
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#define sv_destroy(sv) \
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/*NOTHING*/
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#define sv_wait(sv, pri, lock, s) \
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_sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT)
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#define sv_wait_sig(sv, pri, lock, s) \
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_sv_wait(sv, lock, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT)
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#define sv_timedwait(sv, pri, lock, s, svf, ts, rts) \
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_sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, timespec_to_jiffies(ts))
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#define sv_timedwait_sig(sv, pri, lock, s, svf, ts, rts) \
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_sv_wait(sv, lock, TASK_INTERRUPTIBLE, timespec_to_jiffies(ts))
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#define sv_signal(sv) \
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wake_up(&(sv)->waiters)
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#define sv_broadcast(sv) \
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wake_up_all(&(sv)->waiters)
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#endif /* __XFS_SUPPORT_SV_H__ */
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