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