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61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
#ifndef __MUTEX_CONTROL_H__
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#define __MUTEX_CONTROL_H__
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#if !defined(__LINUX_CONTAINER__)
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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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#define MUTEX_CONTROL_OPMASK L4_MUTEX_OPMASK
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#define mutex_operation(x) ((x) & MUTEX_CONTROL_OPMASK)
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#define mutex_contenders(x) ((x) & ~MUTEX_CONTROL_OPMASK)
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#include <l4lib/lib/wait.h>
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#include <l4lib/lib/list.h>
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#include <l4lib/lib/mutex.h>
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/*
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* Contender threashold is the total number of contenders
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* who are expected to sleep on the mutex, and will be waited
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* for a wakeup.
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*/
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struct mutex_queue {
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int contenders;
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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_OPMASK 0xF0000000
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#define L4_MUTEX_LOCK 0x10000000
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#define L4_MUTEX_UNLOCK 0x20000000
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#endif /* __LINUX_CONTAINER__ */
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#endif /* __MUTEX_CONTROL_H__*/
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