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44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
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/*
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* Atomic read/write
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* Copyright (c) 2001 by Abramo Bagnara <abramo@alsa-project.org>
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (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 Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdlib.h>
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#include <time.h>
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#include <sched.h>
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#include "atomic.h"
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void snd_atomic_read_wait(snd_atomic_read_t *t)
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{
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volatile const snd_atomic_write_t *w = t->write;
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unsigned int loops = 0;
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struct timespec ts;
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while (w->begin != w->end) {
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if (loops < MAX_SPIN_COUNT) {
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sched_yield();
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loops++;
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continue;
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}
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loops = 0;
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ts.tv_sec = 0;
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ts.tv_nsec = SPIN_SLEEP_DURATION;
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nanosleep(&ts, NULL);
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}
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}
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