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1/* Spin locks.
2 Copyright (C) 2000-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <pthread.h>
20#include <sched.h>
21
22/* The default for single processor machines; don't spin, it's
23 pointless. */
24#ifndef __PTHREAD_SPIN_COUNT
25# define __PTHREAD_SPIN_COUNT 1
26#endif
27
28/* The number of times to spin while trying to lock a spin lock object
29 before yielding the processor. */
30int __pthread_spin_count = __PTHREAD_SPIN_COUNT;
31
32
33/* Lock the spin lock object LOCK. If the lock is held by another
34 thread spin until it becomes available. */
35int
36_pthread_spin_lock (__pthread_spinlock_t *lock)
37{
38 int i;
39
40 while (1)
41 {
42 for (i = 0; i < __pthread_spin_count; i++)
43 {
44 if (__pthread_spin_trylock (lock) == 0)
45 return 0;
46 }
47
48 __sched_yield ();
49 }
50}
51

Warning: That file was not part of the compilation database. It may have many parsing errors.