lwp.private.h

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/* BLURB lgpl
 
                           Coda File System
                              Release 5
 
          Copyright (c) 1987-2008 Carnegie Mellon University
                  Additional copyrights listed below
 
This  code  is  distributed "AS IS" without warranty of any kind under
the  terms of the  GNU  Library General Public Licence  Version 2,  as
shown in the file LICENSE. The technical and financial contributors to
Coda are listed in the file CREDITS.
 
                        Additional copyrights
 
#*/
 
/*
                         IBM COPYRIGHT NOTICE
 
                          Copyright (C) 1986
             International Business Machines Corporation
                         All Rights Reserved
 
This  file  contains  some  code identical to or derived from the 1986
version of the Andrew File System ("AFS"), which is owned by  the  IBM
Corporation.   This  code is provided "AS IS" and IBM does not warrant
that it is free of infringement of  any  intellectual  rights  of  any
third  party.    IBM  disclaims  liability of any kind for any damages
whatsoever resulting directly or indirectly from use of this  software
or  of  any  derivative work.  Carnegie Mellon University has obtained
permission to  modify,  distribute and sublicense this code,  which is
based on Version 2  of  AFS  and  does  not  contain  the features and
enhancements that are part of  Version 3 of  AFS.  Version 3 of AFS is
commercially   available   and  supported  by   Transarc  Corporation,
Pittsburgh, PA.
 
*/
 
#ifndef _LWP_PRIVATE_
#define _LWP_PRIVATE_
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include <sys/time.h>
#include <stdio.h>
#include "lwp_ucontext.h"
 
/* Initial size of eventlist in a PCB; grows dynamically  */
#define EVINITSIZE 5
 
struct rock { /* to hide things associated with this LWP under */
    int tag; /* unique identifier for this rock */
    char *value; /* pointer to some arbitrary data structure */
};
 
#define MAXROCKS 8 /* max no. of rocks per LWP */
 
struct lwp_pcb { /* process control block */
    char *name; /* ASCII name */
    int rc; /* most recent return code */
    char status; /* status flags */
    const void **eventlist; /* ptr to array of eventids */
    char eventlistsize; /* size of eventlist array */
    int eventcnt; /* no. of events currently in eventlist array*/
    int wakevent; /* index of eventid causing wakeup */
    int waitcnt; /* min number of events awaited */
    int qpending; /* number of pending QSignal events */
    int priority; /* dispatching priority */
    PROCESS misc; /* for LWP internal use only */
    long stackcheck; /* first word of stack for overflow checking */
    unsigned int valgrind_stackid; /* stack identifier from valgrind */
    void *topstack; /* stack ptr value during last yield */
    void (*ep)(void *); /* initial entry point */
    char *parm; /* initial parm for process */
    int rused; /* no of rocks presently in use */
    struct rock rlist[MAXROCKS]; /* set of rocks to hide things under */
    PROCESS next, prev; /* ptrs to next and previous pcb */
    int level; /* nesting level of critical sections */
    struct IoRequest *iomgrRequest; /* request we're waiting for */
    int index; /* LWP index: should be small index; actually is
                                           incremented on each lwp_create_process */
    struct timeval lastReady; /* if ready, time placed in the run queue */
 
    stack_t stack; /* allocated stack for this thread */
    struct lwp_ucontext ctx; /* saved context for next dispatch */
};
 
extern int lwp_nextindex; /* Next lwp index to assign */
 
extern PROCESS lwp_cpptr; /* pointer to current process pcb */
struct lwp_ctl { /* LWP control structure */
    int processcnt; /* number of lightweight processes */
    PROCESS outerpid; /* process carved by Initialize */
    void *outersp;
};
 
/* Debugging macro */
#ifdef LWPDEBUG
extern FILE *lwp_logfile;
#define lwpdebug(level, msg...)                           \
    if (lwp_debug > level && lwp_logfile) {               \
        fprintf(lwp_logfile, "***LWP (%p): ", lwp_cpptr); \
        fprintf(lwp_logfile, ##msg);                      \
        fprintf(lwp_logfile, "\n");                       \
        fflush(lwp_logfile);                              \
    }
#else /* !LWPDEBUG */
#define lwpdebug(level, msg...)
#endif /* !LWPDEBUG */
 
#endif /* _LWP_PRIVATE_ */