Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of version 2 of the GNU General Public License as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it would be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 11 | * |
| 12 | * Further, this software is distributed without any warranty that it is |
| 13 | * free of the rightful claim of any third person regarding infringement |
| 14 | * or the like. Any license provided herein, whether implied or |
| 15 | * otherwise, applies only to this software file. Patent licenses, if |
| 16 | * any, provided herein do not apply to combinations of this program with |
| 17 | * other software, or any other product whatsoever. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write the Free Software Foundation, Inc., 59 |
| 21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. |
| 22 | * |
| 23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, |
| 24 | * Mountain View, CA 94043, or: |
| 25 | * |
| 26 | * http://www.sgi.com |
| 27 | * |
| 28 | * For further information regarding this notice, see: |
| 29 | * |
| 30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ |
| 31 | */ |
| 32 | #ifndef __XFS_SUPPORT_SV_H__ |
| 33 | #define __XFS_SUPPORT_SV_H__ |
| 34 | |
| 35 | #include <linux/wait.h> |
| 36 | #include <linux/sched.h> |
| 37 | #include <linux/spinlock.h> |
| 38 | |
| 39 | /* |
| 40 | * Synchronisation variables. |
| 41 | * |
| 42 | * (Parameters "pri", "svf" and "rts" are not implemented) |
| 43 | */ |
| 44 | |
| 45 | typedef struct sv_s { |
| 46 | wait_queue_head_t waiters; |
| 47 | } sv_t; |
| 48 | |
| 49 | #define SV_FIFO 0x0 /* sv_t is FIFO type */ |
| 50 | #define SV_LIFO 0x2 /* sv_t is LIFO type */ |
| 51 | #define SV_PRIO 0x4 /* sv_t is PRIO type */ |
| 52 | #define SV_KEYED 0x6 /* sv_t is KEYED type */ |
| 53 | #define SV_DEFAULT SV_FIFO |
| 54 | |
| 55 | |
| 56 | static inline void _sv_wait(sv_t *sv, spinlock_t *lock, int state, |
| 57 | unsigned long timeout) |
| 58 | { |
| 59 | DECLARE_WAITQUEUE(wait, current); |
| 60 | |
| 61 | add_wait_queue_exclusive(&sv->waiters, &wait); |
| 62 | __set_current_state(state); |
| 63 | spin_unlock(lock); |
| 64 | |
| 65 | schedule_timeout(timeout); |
| 66 | |
| 67 | remove_wait_queue(&sv->waiters, &wait); |
| 68 | } |
| 69 | |
| 70 | #define init_sv(sv,type,name,flag) \ |
| 71 | init_waitqueue_head(&(sv)->waiters) |
| 72 | #define sv_init(sv,flag,name) \ |
| 73 | init_waitqueue_head(&(sv)->waiters) |
| 74 | #define sv_destroy(sv) \ |
| 75 | /*NOTHING*/ |
| 76 | #define sv_wait(sv, pri, lock, s) \ |
| 77 | _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT) |
| 78 | #define sv_wait_sig(sv, pri, lock, s) \ |
| 79 | _sv_wait(sv, lock, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT) |
| 80 | #define sv_timedwait(sv, pri, lock, s, svf, ts, rts) \ |
| 81 | _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, timespec_to_jiffies(ts)) |
| 82 | #define sv_timedwait_sig(sv, pri, lock, s, svf, ts, rts) \ |
| 83 | _sv_wait(sv, lock, TASK_INTERRUPTIBLE, timespec_to_jiffies(ts)) |
| 84 | #define sv_signal(sv) \ |
| 85 | wake_up(&(sv)->waiters) |
| 86 | #define sv_broadcast(sv) \ |
| 87 | wake_up_all(&(sv)->waiters) |
| 88 | |
| 89 | #endif /* __XFS_SUPPORT_SV_H__ */ |