1/* 2 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18#ifndef __XFS_SUPPORT_SV_H__ 19#define __XFS_SUPPORT_SV_H__ 20 21#include <linux/wait.h> 22#include <linux/sched.h> 23#include <linux/spinlock.h> 24 25/* 26 * Synchronisation variables. 27 * 28 * (Parameters "pri", "svf" and "rts" are not implemented) 29 */ 30 31typedef struct sv_s { 32 wait_queue_head_t waiters; 33} sv_t; 34 35#define SV_FIFO 0x0 /* sv_t is FIFO type */ 36#define SV_LIFO 0x2 /* sv_t is LIFO type */ 37#define SV_PRIO 0x4 /* sv_t is PRIO type */ 38#define SV_KEYED 0x6 /* sv_t is KEYED type */ 39#define SV_DEFAULT SV_FIFO 40 41 42static inline void _sv_wait(sv_t *sv, spinlock_t *lock, int state, 43 unsigned long timeout) 44{ 45 DECLARE_WAITQUEUE(wait, current); 46 47 add_wait_queue_exclusive(&sv->waiters, &wait); 48 __set_current_state(state); 49 spin_unlock(lock); 50 51 schedule_timeout(timeout); 52 53 remove_wait_queue(&sv->waiters, &wait); 54} 55 56#define sv_init(sv,flag,name) \ 57 init_waitqueue_head(&(sv)->waiters) 58#define sv_destroy(sv) \ 59 /*NOTHING*/ 60#define sv_wait(sv, pri, lock, s) \ 61 _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT) 62#define sv_wait_sig(sv, pri, lock, s) \ 63 _sv_wait(sv, lock, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT) 64#define sv_timedwait(sv, pri, lock, s, svf, ts, rts) \ 65 _sv_wait(sv, lock, TASK_UNINTERRUPTIBLE, timespec_to_jiffies(ts)) 66#define sv_timedwait_sig(sv, pri, lock, s, svf, ts, rts) \ 67 _sv_wait(sv, lock, TASK_INTERRUPTIBLE, timespec_to_jiffies(ts)) 68#define sv_signal(sv) \ 69 wake_up(&(sv)->waiters) 70#define sv_broadcast(sv) \ 71 wake_up_all(&(sv)->waiters) 72 73#endif /* __XFS_SUPPORT_SV_H__ */ 74