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-rw-r--r--nptl/pthread_mutex_conf.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/nptl/pthread_mutex_conf.c b/nptl/pthread_mutex_conf.c
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+/* 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