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https://github.com/drasko/codezero.git
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b11d4c4607
- Compiles and Codezero runs as normal without touching mutex implementation - Mutex implementation needs testing. The mutex control syscall allows userspace programs to declare any virtual address as a mutex lock and ask for help from the kernel syscall for resolving locking contentions.
39 lines
693 B
C
39 lines
693 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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unsigned 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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/* Mutex states - Any valid tid value is a locked state */
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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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