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/* Pthread mutex tunable parameters.
Copyright (C) 2018-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#if HAVE_TUNABLES
# define TUNABLE_NAMESPACE pthread
#include <pthread_mutex_conf.h>
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h> /* Get STDOUT_FILENO for _dl_printf. */
#include <elf/dl-tunables.h>
struct mutex_config __mutex_aconf =
{
/* The maximum number of times a thread should spin on the lock before
calling into kernel to block. */
.spin_count = DEFAULT_ADAPTIVE_COUNT,
};
libc_hidden_data_def (__mutex_aconf)
static void
TUNABLE_CALLBACK (set_mutex_spin_count) (tunable_val_t *valp)
{
__mutex_aconf.spin_count = (int32_t) (valp)->numval;
}
void
__pthread_tunables_init (void)
{
TUNABLE_GET (mutex_spin_count, int32_t,
TUNABLE_CALLBACK (set_mutex_spin_count));
}
#endif
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