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47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/* Pthread mutex tunable parameters.
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Copyright (C) 2018-2020 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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#if HAVE_TUNABLES
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# define TUNABLE_NAMESPACE pthread
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#include <pthread_mutex_conf.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <unistd.h> /* Get STDOUT_FILENO for _dl_printf. */
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#include <elf/dl-tunables.h>
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struct mutex_config __mutex_aconf =
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{
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/* The maximum number of times a thread should spin on the lock before
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calling into kernel to block. */
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.spin_count = DEFAULT_ADAPTIVE_COUNT,
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};
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static void
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TUNABLE_CALLBACK (set_mutex_spin_count) (tunable_val_t *valp)
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{
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__mutex_aconf.spin_count = (int32_t) (valp)->numval;
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}
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void
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__pthread_tunables_init (void)
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{
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TUNABLE_GET (mutex_spin_count, int32_t,
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TUNABLE_CALLBACK (set_mutex_spin_count));
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}
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#endif
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