glibc/sysdeps/generic/machine-lock.h
Paul Eggert 2b778ceb40 Update copyright dates with scripts/update-copyrights
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master
2021-01-02 12:17:34 -08:00

76 lines
1.9 KiB
C

/* Machine-specific definition for spin locks. Stub version.
Copyright (C) 1994-2021 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
<https://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 void __spin_unlock (__spin_lock_t *__lock);
#if defined __USE_EXTERN_INLINES && defined _LIBC
_EXTERN_INLINE void
__spin_unlock (__spin_lock_t *__lock)
{
*__lock = 0;
}
#endif
/* Try to lock LOCK; return nonzero if we locked it, zero if another has. */
extern int __spin_try_lock (__spin_lock_t *__lock);
#if defined __USE_EXTERN_INLINES && defined _LIBC
_EXTERN_INLINE int
__spin_try_lock (__spin_lock_t *__lock)
{
if (*__lock)
return 0;
*__lock = 1;
return 1;
}
#endif
/* Return nonzero if LOCK is locked. */
extern int __spin_lock_locked (__spin_lock_t *__lock);
#if defined __USE_EXTERN_INLINES && defined _LIBC
_EXTERN_INLINE int
__spin_lock_locked (__spin_lock_t *__lock)
{
return *__lock != 0;
}
#endif
#endif /* machine-lock.h */