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46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
#ifndef __MUTEX_CONTROL_H__
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#define __MUTEX_CONTROL_H__
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/* Request ids for mutex_control syscall */
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#if defined (__KERNEL__)
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#define MUTEX_CONTROL_LOCK L4_MUTEX_LOCK
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#define MUTEX_CONTROL_UNLOCK L4_MUTEX_UNLOCK
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#include <l4/lib/wait.h>
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#include <l4/lib/list.h>
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#include <l4/lib/mutex.h>
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struct mutex_queue {
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unsigned long physical;
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struct link list;
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struct waitqueue_head wqh_contenders;
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struct waitqueue_head wqh_holders;
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};
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/*
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* Mutex queue head keeps the list of all userspace mutexes.
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*
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* Here, mutex_control_mutex is a single lock for:
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* (1) Mutex_queue create/deletion
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* (2) List add/removal.
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* (3) Wait synchronization:
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* - Both waitqueue spinlocks need to be acquired for
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* rendezvous inspection to occur atomically. Currently
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* it's not done since we rely on this mutex for that.
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*/
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struct mutex_queue_head {
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struct link list;
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struct mutex mutex_control_mutex;
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int count;
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};
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void init_mutex_queue_head(struct mutex_queue_head *mqhead);
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#endif
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#define L4_MUTEX_LOCK 0
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#define L4_MUTEX_UNLOCK 1
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#endif /* __MUTEX_CONTROL_H__*/
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