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33237fe83d
And make always supported. The configure option was added on glibc 2.25 and some features require it (such as hwcap mask, huge pages support, and lock elisition tuning). It also simplifies the build permutations. Changes from v1: * Remove glibc.rtld.dynamic_sort changes, it is orthogonal and needs more discussion. * Cleanup more code. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/* Pthread mutex tunable parameters.
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Copyright (C) 2018-2023 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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#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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#include <nptl-stack.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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libc_hidden_data_def (__mutex_aconf)
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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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static void
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TUNABLE_CALLBACK (set_stack_cache_size) (tunable_val_t *valp)
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{
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__nptl_stack_cache_maxsize = 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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TUNABLE_GET (stack_cache_size, size_t,
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TUNABLE_CALLBACK (set_stack_cache_size));
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}
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