63 lines
2.5 KiB
C
63 lines
2.5 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Björn Stenberg
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef MUTEX_H
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#define MUTEX_H
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#include <stdbool.h>
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#include "config.h"
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#include "thread.h"
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struct mutex
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{
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struct thread_entry *queue; /* waiter list */
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int recursion; /* lock owner recursion count */
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#ifdef HAVE_PRIORITY_SCHEDULING
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struct blocker blocker; /* priority inheritance info
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for waiters */
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bool no_preempt; /* don't allow higher-priority thread
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to be scheduled even if woken */
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#else
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struct thread_entry *thread; /* Indicates owner thread - an owner
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implies a locked state - same goes
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for priority scheduling
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(in blocker struct for that) */
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#endif
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IF_COP( struct corelock cl; ) /* multiprocessor sync */
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};
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extern void mutex_init(struct mutex *m);
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extern void mutex_lock(struct mutex *m);
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extern void mutex_unlock(struct mutex *m);
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#ifdef HAVE_PRIORITY_SCHEDULING
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/* Deprecated temporary function to disable mutex preempting a thread on
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* unlock - firmware/drivers/fat.c and a couple places in apps/buffering.c -
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* reliance on it is a bug! */
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static inline void mutex_set_preempt(struct mutex *m, bool preempt)
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{ m->no_preempt = !preempt; }
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#else
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/* Deprecated but needed for now - firmware/drivers/ata_mmc.c */
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static inline bool mutex_test(const struct mutex *m)
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{ return m->thread != NULL; }
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#endif /* HAVE_PRIORITY_SCHEDULING */
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#endif /* MUTEX_H */
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