mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-25 20:21:07 +00:00
688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/* Machine-specific definition for spin locks. Stub version.
|
|
Copyright (C) 1994-2018 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/>. */
|
|
|
|
#ifndef _MACHINE_LOCK_H
|
|
#define _MACHINE_LOCK_H
|
|
|
|
/* The type of a spin lock variable. */
|
|
|
|
typedef volatile int __spin_lock_t;
|
|
|
|
/* Value to initialize `__spin_lock_t' variables to. */
|
|
|
|
#define __SPIN_LOCK_INITIALIZER 0
|
|
|
|
|
|
#ifndef _EXTERN_INLINE
|
|
#define _EXTERN_INLINE __extern_inline
|
|
#endif
|
|
|
|
/* Unlock LOCK. */
|
|
|
|
_EXTERN_INLINE void
|
|
__spin_unlock (__spin_lock_t *__lock)
|
|
{
|
|
*__lock = 0;
|
|
}
|
|
|
|
/* Try to lock LOCK; return nonzero if we locked it, zero if another has. */
|
|
|
|
_EXTERN_INLINE int
|
|
__spin_try_lock (__spin_lock_t *__lock)
|
|
{
|
|
if (*__lock)
|
|
return 0;
|
|
*__lock = 1;
|
|
return 1;
|
|
}
|
|
|
|
/* Return nonzero if LOCK is locked. */
|
|
|
|
_EXTERN_INLINE int
|
|
__spin_lock_locked (__spin_lock_t *__lock)
|
|
{
|
|
return *__lock != 0;
|
|
}
|
|
|
|
|
|
#endif /* machine-lock.h */
|