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40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
/* Pthread mutex backoff configuration.
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Copyright (C) 2022-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _PTHREAD_MUTEX_BACKOFF_H
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#define _PTHREAD_MUTEX_BACKOFF_H 1
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#include <fast-jitter.h>
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static inline unsigned int
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get_jitter (void)
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{
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return get_fast_jitter ();
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}
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#define MAX_BACKOFF 16
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static inline int
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get_next_backoff (int backoff)
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{
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/* Binary expontial backoff. Limiting max backoff
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can reduce latency in large critical section. */
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return (backoff < MAX_BACKOFF) ? backoff << 1 : backoff;
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}
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#endif
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