glibc/mach/lock-intern.h
Andreas Jaeger 41bdb6e20c Update to LGPL v2.1.
2001-07-06  Paul Eggert  <eggert@twinsun.com>

	* manual/argp.texi: Remove ignored LGPL copyright notice; it's
	not appropriate for documentation anyway.
	* manual/libc-texinfo.sh: "Library General Public License" ->
	"Lesser General Public License".

2001-07-06  Andreas Jaeger  <aj@suse.de>

	* All files under GPL/LGPL version 2: Place under LGPL version
	2.1.
2001-07-06 04:58:11 +00:00

97 lines
2.7 KiB
C
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/* Copyright (C) 1994, 1996 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _LOCK_INTERN_H
#define _LOCK_INTERN_H
#include <machine-lock.h>
#ifndef _EXTERN_INLINE
#define _EXTERN_INLINE extern __inline
#endif
/* Initialize LOCK. */
_EXTERN_INLINE void
__spin_lock_init (__spin_lock_t *__lock)
{
*__lock = __SPIN_LOCK_INITIALIZER;
}
/* Lock LOCK, blocking if we can't get it. */
extern void __spin_lock_solid (__spin_lock_t *__lock);
/* Lock the spin lock LOCK. */
_EXTERN_INLINE void
__spin_lock (__spin_lock_t *__lock)
{
if (! __spin_try_lock (__lock))
__spin_lock_solid (__lock);
}
/* Name space-clean internal interface to mutex locks.
Code internal to the C library uses these functions to lock and unlock
mutex locks. These locks are of type `struct mutex', defined in
<cthreads.h>. The functions here are name space-clean. If the program
is linked with the cthreads library, `__mutex_lock_solid' and
`__mutex_unlock_solid' will invoke the corresponding cthreads functions
to implement real mutex locks. If not, simple stub versions just use
spin locks. */
/* Initialize the newly allocated mutex lock LOCK for further use. */
extern void __mutex_init (void *__lock);
/* Lock LOCK, blocking if we can't get it. */
extern void __mutex_lock_solid (void *__lock);
/* Finish unlocking LOCK, after the spin lock LOCK->held has already been
unlocked. This function will wake up any thread waiting on LOCK. */
extern void __mutex_unlock_solid (void *__lock);
/* Lock the mutex lock LOCK. */
_EXTERN_INLINE void
__mutex_lock (void *__lock)
{
if (! __spin_try_lock ((__spin_lock_t *) __lock))
__mutex_lock_solid (__lock);
}
/* Unlock the mutex lock LOCK. */
_EXTERN_INLINE void
__mutex_unlock (void *__lock)
{
__spin_unlock ((__spin_lock_t *) __lock);
__mutex_unlock_solid (__lock);
}
_EXTERN_INLINE int
__mutex_trylock (void *__lock)
{
return __spin_try_lock ((__spin_lock_t *) __lock);
}
#endif /* lock-intern.h */