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-rw-r--r--firmware/kernel/include/mutex.h62
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diff --git a/firmware/kernel/include/mutex.h b/firmware/kernel/include/mutex.h
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+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Björn Stenberg
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef MUTEX_H
+#define MUTEX_H
+
+#include <stdbool.h>
+#include "config.h"
+#include "thread.h"
+
+struct mutex
+{
+ struct thread_entry *queue; /* waiter list */
+ int recursion; /* lock owner recursion count */
+#ifdef HAVE_PRIORITY_SCHEDULING
+ struct blocker blocker; /* priority inheritance info
+ for waiters */
+ bool no_preempt; /* don't allow higher-priority thread
+ to be scheduled even if woken */
+#else
+ struct thread_entry *thread; /* Indicates owner thread - an owner
+ implies a locked state - same goes
+ for priority scheduling
+ (in blocker struct for that) */
+#endif
+ IF_COP( struct corelock cl; ) /* multiprocessor sync */
+};
+
+extern void mutex_init(struct mutex *m);
+extern void mutex_lock(struct mutex *m);
+extern void mutex_unlock(struct mutex *m);
+#ifdef HAVE_PRIORITY_SCHEDULING
+/* Deprecated temporary function to disable mutex preempting a thread on
+ * unlock - firmware/drivers/fat.c and a couple places in apps/buffering.c -
+ * reliance on it is a bug! */
+static inline void mutex_set_preempt(struct mutex *m, bool preempt)
+ { m->no_preempt = !preempt; }
+#else
+/* Deprecated but needed for now - firmware/drivers/ata_mmc.c */
+static inline bool mutex_test(const struct mutex *m)
+ { return m->thread != NULL; }
+#endif /* HAVE_PRIORITY_SCHEDULING */
+
+#endif /* MUTEX_H */