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43 lines
760 B
C
43 lines
760 B
C
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/*
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* User space locking
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*
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* Copyright (C) 2009 Bahadir Bilgehan Balban
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*/
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#ifndef __L4_MUTEX_H__
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#define __L4_MUTEX_H__
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#if !defined(__ASSEMBLY__)
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#include <l4/api/mutex.h>
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struct l4_mutex {
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int lock;
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} __attribute__((aligned(sizeof(int))));
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void l4_mutex_init(struct l4_mutex *m);
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int l4_mutex_lock(struct l4_mutex *m);
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int l4_mutex_unlock(struct l4_mutex *m);
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#endif
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/* Mutex return value - don't mix up with mutes state */
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#define L4_MUTEX_CONTENDED -1
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#define L4_MUTEX_SUCCESS 0
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/*
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* Mutex states:
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* Unlocked = -1, locked = 0, anything above 0 tells
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* number of contended threads
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*/
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#define L4_MUTEX_LOCKED 0
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#define L4_MUTEX_UNLOCKED -1
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#define L4_MUTEX(m) \
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struct l4_mutex m = { L4_MUTEX_UNLOCKED }
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#endif /* __L4_MUTEX_H__ */
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