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Import of Empire 4.2.12

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Markus Armbruster 2003-08-23 12:23:04 +00:00
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include/lwp.h Normal file
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/*
* lwp.h -- prototypes and structures for lightweight processes
* Copyright (C) 1991-3 Stephen Crane.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* author: Stephen Crane, (jsc@doc.ic.ac.uk), Department of Computing,
* Imperial College of Science, Technology and Medicine, 180 Queen's
* Gate, London SW7 2BZ, England.
*/
#ifndef _LWP_H_
#define _LWP_H_
#include "prototype.h"
#ifdef UCONTEXT
#include <ucontext.h>
#else /* UCONTEXT */
#include <setjmp.h>
#endif /* UCONTEXT */
#include <sys/time.h>
#include "misc.h"
#define LWP_STACKCHECK 0x1
#define LWP_PRINT 0x2
/* process control block. do *not* change the position of context */
struct lwpProc {
#ifdef UCONTEXT
ucontext_t context; /* context structure */
#else /* UCONTEXT */
jmp_buf context; /* processor context area */
#endif /* UCONTEXT */
void *sbtm; /* bottom of stack attached to it */
int size; /* size of stack */
void (*entry)(); /* entry point */
int dead; /* whether the process can be rescheduled */
int pri; /* which scheduling queue we're on */
long runtime; /* time at which process is restarted */
int fd; /* fd we're blocking on */
int argc; /* initial arguments */
char **argv;
void *ud; /* user data */
void *lowmark; /* start of low buffer around stack */
void *himark; /* start of upper buffer around stack */
char *name; /* process name and description */
char *desc;
int flags;
struct lwpProc *next;
};
/* queue */
struct lwpQueue {
struct lwpProc *head;
struct lwpProc *tail;
};
/* semaphore */
struct lwpSem {
int count;
struct lwpQueue q;
char *name;
};
#define LWP_FD_READ 0x1
#define LWP_FD_WRITE 0x2
#define LWP_MAX_PRIO 8
struct lwpProc *lwpInitSystem _PROTO((int prio, char **ctxp, int flags));
struct lwpProc *lwpCreate _PROTO((int prio, void (*)(), int size,
int flags, char *name, char *desc, int argc,
char **argv, void *ud));
void lwpExit _PROTO((void));
void lwpTerminate _PROTO((struct lwpProc *p));
void lwpYield _PROTO((void));
void lwpSleepFd _PROTO((int fd, int flags));
void lwpSleepUntil _PROTO((long until));
void lwpWakeupFd _PROTO((struct lwpProc *p));
void *lwpGetUD _PROTO((struct lwpProc *p));
void lwpSetUD _PROTO((struct lwpProc *p, char *ud));
void lwpSetDesc _PROTO((struct lwpProc *p, char *name, char *desc));
int lwpSetPriority _PROTO((int prio));
void lwpReschedule _PROTO((void));
struct lwpSem *lwpCreateSem _PROTO((char *name, int count));
void lwpSignal _PROTO((struct lwpSem *));
void lwpWait _PROTO((struct lwpSem *));
void lwpSelect _PROTO((int argc, char **argv));
void lwpStatus _PROTO((struct lwpProc *proc, char *format, ...));
extern struct lwpProc *LwpCurrent;
#include "prototypes.h" /* must come at end, after defines and typedefs */
#endif /* _LWP_H_ */