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/* Mutex type. Generic version.
Copyright (C) 2000,02 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _BITS_MUTEX_H
#ifndef __need_pthread_mutex
# define _BITS_MUTEX_H 1
#endif
#ifndef __pthread_mutex_defined
# if defined __need_pthread_mutex || defined _BITS_MUTEX_H
# undef __need_pthread_mutex
# define __pthread_mutex_defined
# include <bits/spin-lock.h>
# include <bits/mutex-attr.h>
/* User visible part of a mutex. */
struct __pthread_mutex
{
__pthread_spinlock_t __held;
__pthread_spinlock_t __lock;
/* In cthreads, mutex_init does not initialized thre third
pointer, as such, we cannot rely on its value for anything. */
char *cthreadscompat1;
struct __pthread *__queue;
struct __pthread_mutexattr *attr;
void *data;
/* Up to this point, we are completely compatible with cthreads
and what libc expects. */
void *owner;
unsigned locks;
/* If NULL then the default attributes apply. */
};
/* Initializer for a mutex. N.B. this also happens to be compatible
with the cthread mutex initializer. */
# define __PTHREAD_MUTEX_INITIALIZER \
((struct __pthread_mutex) \
{ __SPIN_LOCK_INITIALIZER, __SPIN_LOCK_INITIALIZER, NULL, NULL, NULL, \
NULL, 0, 0 })
# endif
#endif /* Not __pthread_mutex_defined. */
#ifdef _BITS_MUTEX_H
#include <errno.h>
#include <stddef.h>
#ifdef __USE_EXTERN_INLINES
# ifndef _EXTERN_INLINE
# define _EXTERN_INLINE extern __inline
# endif
_EXTERN_INLINE int
pthread_mutex_init (struct __pthread_mutex *__mutex,
const pthread_mutexattr_t *attr)
{
extern int _pthread_mutex_init (struct __pthread_mutex *,
const pthread_mutexattr_t *);
if (attr)
return _pthread_mutex_init (__mutex, attr);
*__mutex = __PTHREAD_MUTEX_INITIALIZER;
return 0;
}
_EXTERN_INLINE int
pthread_mutex_destroy (struct __pthread_mutex *__mutex)
{
extern int _pthread_mutex_destroy (struct __pthread_mutex *);
if (__mutex->attr || __mutex->data)
return _pthread_mutex_destroy (__mutex);
return 0;
}
_EXTERN_INLINE int
__pthread_mutex_lock (struct __pthread_mutex *__mutex)
{
extern int _pthread_mutex_lock (struct __pthread_mutex *);
if (__mutex->attr == NULL
&& __mutex->data == NULL
&& __pthread_spin_trylock (&__mutex->__held) == 0)
return 0;
return _pthread_mutex_lock (__mutex);
}
extern __inline int
__pthread_mutex_trylock (struct __pthread_mutex *__mutex)
{
extern int _pthread_mutex_trylock (struct __pthread_mutex *);
if (__mutex->attr == NULL
&& __mutex->data == NULL)
return __pthread_spin_trylock (&__mutex->__held);
return _pthread_mutex_trylock (__mutex);
}
extern __inline int
pthread_mutex_lock (struct __pthread_mutex *__mutex)
{
return __pthread_mutex_lock (__mutex);
}
extern __inline int
pthread_mutex_trylock (struct __pthread_mutex *__mutex)
{
return __pthread_mutex_trylock (__mutex);
}
#endif /* Use extern inlines. */
#endif
#endif /* bits/mutex.h */
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