mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-22 19:00:07 +00:00
90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
|
/* Copyright (C) 1994 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 Library General Public License as
|
|||
|
|
published by the Free Software Foundation; either version 2 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
|
|||
|
|
Library General Public License for more details.
|
|||
|
|
|
|||
|
|
You should have received a copy of the GNU Library General Public
|
|||
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|||
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|||
|
|
Cambridge, MA 02139, 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);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#endif /* lock-intern.h */
|