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/* Copyright (C) 2017 Free Software Foundation, Inc.
Contributed by Agustina Arzille <avarzille@riseup.net>, 2017.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either
version 2 of the license, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public
License along with this program; if not, see
<http://www.gnu.org/licenses/>.
*/
#ifndef _KERN_KMUTEX_H_
#define _KERN_KMUTEX_H_ 1
#include <kern/lock.h>
#include <mach/kern_return.h>
struct kmutex
{
unsigned int state;
decl_simple_lock_data (, lock)
};
/* Possible values for the mutex state. */
#define KMUTEX_AVAIL 0
#define KMUTEX_LOCKED 1
#define KMUTEX_CONTENDED 2
/* Initialize mutex in *MTXP. */
extern void kmutex_init (struct kmutex *mtxp);
/* Acquire lock MTXP. If INTERRUPTIBLE is true, the sleep may be
* prematurely terminated, in which case the function returns
* KERN_INTERRUPTED. Otherwise, KERN_SUCCESS is returned. */
extern kern_return_t kmutex_lock (struct kmutex *mtxp,
boolean_t interruptible);
/* Try to acquire the lock MTXP without sleeping.
* Returns KERN_SUCCESS if successful, KERN_FAILURE otherwise. */
extern kern_return_t kmutex_trylock (struct kmutex *mtxp);
/* Unlock the mutex MTXP. */
extern void kmutex_unlock (struct kmutex *mtxp);
#endif
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