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- /*
- * Copyright (c) 1993,1994 The University of Utah and
- * the Computer Systems Laboratory (CSL). All rights reserved.
- *
- * Permission to use, copy, modify and distribute this software and its
- * documentation is hereby granted, provided that both the copyright
- * notice and this permission notice appear in all copies of the
- * software, derivative works or modified versions, and any portions
- * thereof, and that both notices appear in supporting documentation.
- *
- * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
- * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
- * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
- *
- * CSL requests users of this software to return to csl-dist@cs.utah.edu any
- * improvements that they make and grant CSL redistribution rights.
- *
- * Author: Bryan Ford, University of Utah CSL
- */
- /*
- * File: shuttle.h
- * Author: Bryan Ford
- *
- * This file contains definitions for shuttles,
- * which handle microscheduling for individual threads.
- *
- */
- #ifndef _KERN_SHUTTLE_H_
- #define _KERN_SHUTTLE_H_
- #include <kern/lock.h>
- struct Shuttle {
- /* XXX must be first in thread */
- /*
- * NOTE: The runq field in the thread structure has an unusual
- * locking protocol. If its value is RUN_QUEUE_NULL, then it is
- * locked by the thread_lock, but if its value is something else
- * (i.e. a run_queue) then it is locked by that run_queue's lock.
- */
- queue_chain_t links; /* current run queue links */
- run_queue_t runq; /* run queue p is on SEE BELOW */
- /* Next pointer when on a queue */
- struct Shuttle *next;
- /* Micropriority level */
- int priority;
- /* General-purpose pointer field whose use depends on what the
- thread happens to be doing */
- void *message;
- int foobar[1];
- };
- typedef struct Shuttle Shuttle;
- /* Exported functions */
- /* Machine-dependent code must define the following functions */
- #endif /* _KERN_SHUTTLE_H_ */
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