mirror of https://github.com/schoebel/mars
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/*
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* MARS Long Distance Replication Software
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*
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* This file is part of MARS project: http://schoebel.github.io/mars/
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*
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* Copyright (C) 2010-2014 Thomas Schoebel-Theuer
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* Copyright (C) 2011-2014 1&1 Internet AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License 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 this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef BRICK_WAIT_H
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#define BRICK_WAIT_H
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/* Try to abstract from changes of the upstream kernel
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* by using a hopefully stable interface.
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*/
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#define brick_wait(wq, flag, condition, timeout) \
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({ \
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long __tmout = (timeout); \
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int __old_flag; \
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\
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might_sleep(); \
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smp_rmb(); \
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__old_flag = (flag); \
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\
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while (!(condition)) { \
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int __new_flag; \
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\
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__tmout = wait_event_interruptible_timeout( \
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wq, \
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({ smp_rmb(); \
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__new_flag = (flag); \
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__old_flag != __new_flag; }), \
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__tmout); \
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if (__tmout <= 1) \
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break; \
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__old_flag = __new_flag; \
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} \
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__tmout; \
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})
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#define brick_wake(wq, flag) \
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({ \
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smp_rmb(); \
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(flag)++; \
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smp_wmb(); \
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wake_up_interruptible_all(wq); \
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})
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#endif
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