diff options
Diffstat (limited to 'nptl/pthread_mutex_conf.c')
-rw-r--r-- | nptl/pthread_mutex_conf.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/nptl/pthread_mutex_conf.c b/nptl/pthread_mutex_conf.c new file mode 100644 index 0000000..545e05b --- /dev/null +++ b/nptl/pthread_mutex_conf.c @@ -0,0 +1,46 @@ +/* Pthread mutex tunable parameters. + Copyright (C) 2018 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 + <http://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, +}; + +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 |