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 35static inline void _sv_wait(sv_t *sv, spinlock_t *lock) 36{ 37 DECLARE_WAITQUEUE(wait, current); 38 39 add_wait_queue_exclusive(&sv->waiters, &wait); 40 __set_current_state(TASK_UNINTERRUPTIBLE); 41 spin_unlock(lock); 42 43 schedule(); 44 45 remove_wait_queue(&sv->waiters, &wait); 46} 47 48#define sv_init(sv,flag,name) \ 49 init_waitqueue_head(&(sv)->waiters) 50#define sv_destroy(sv) \ 51 /*NOTHING*/ 52#define sv_wait(sv, pri, lock, s) \ 53 _sv_wait(sv, lock) 54#define sv_signal(sv) \ 55 wake_up(&(sv)->waiters) 56#define sv_broadcast(sv) \ 57 wake_up_all(&(sv)->waiters) 58 59#endif /* __XFS_SUPPORT_SV_H__ */ 60