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# transport.c

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    00001
    00002 /*
    00003  *   THIS FILE IS UNDER RCS - DO NOT MODIFY UNLESS YOU HAVE
    00004  *   CHECKED IT OUT USING THE COMMAND CHECKOUT.
    00005  *
    00006  *    $Id: transport_8c-source.html,v 1.1 2006/05/19 16:55:02 paulf Exp $
    00007  *
    00008  *    Revision history:
    00009  *     $Log: transport_8c-source.html,v $
    00009  *     Revision 1.1  2006/05/19 16:55:02  paulf
    00009  *     first inclusion
    00009  *
    00010  *     Revision 1.3  2001/05/04 23:43:54  dietz
    00011  *     Changed flag arg of tport_putflag from short to int to handle
    00012  *     processids properly.
    00013  *
    00014  *     Revision 1.2  2000/06/02 18:19:48  dietz
    00015  *     Fixed tport_putmsg,tport_copyto to always release semaphore before returning
    00016  *
    00017  *     Revision 1.1  2000/02/14 18:53:30  lucky
    00018  *     Initial revision
    00019  *
    00020  *
    00021  */
    00022
    00023 /********************************************************************/
    00024 /*                                                        6/2000    */
    00025 /*                           transport.c                            */
    00026 /*                                                                  */
    00027 /*   Transport layer functions to access shared memory regions.     */
    00028 /*                                                                  */
    00029 /*   written by Lynn Dietz, Will Kohler with inspiration from       */
    00030 /*       Carl Johnson, Alex Bittenbinder, Barbara Bogaert           */
    00031 /*                                                                  */
    00032 /********************************************************************/
    00033
    00034 /* ***** Notes on development, delete when appropriate
    00035 1. Change the quotes for the transport.h and earthworm.h includes
    00036    when these are moved to the appropriately pathed included directory.
    00037 */
    00038 #include <windows.h>
    00039 #include <sys/types.h>
    00040 #include <stdio.h>
    00041 #include <errno.h>
    00042 #include <string.h>
    00043 #include <time.h>
    00044 #include <process.h>
    00045 #include <transport.h>
    00046
    00047 static short Put_Init=1;           /* initialization flag */
    00048 static short Get_Init=1;           /* initialization flag */
    00049 static short Copyfrom_Init=1;      /* initialization flag */
    00050 static short Copyto_Init  =1;      /* initialization flag */
    00051
    00052 /* These functions are for internal use by transport functions only
    00053    ****************************************************************/
    00054 void  tport_syserr  ( char *, long );
    00055 void  tport_buferror( short, char * );
    00056
    00057 /* These statements and variables are required by the functions of
    00058    the input-buffering thread
    00059    ***************************************************************/
    00060 #include "earthworm.h"
    00061 volatile SHM_INFO *PubRegion;      /* transport public ring      */
    00062 volatile SHM_INFO *BufRegion;      /* pointer to private ring    */
    00063 volatile MSG_LOGO *Getlogo;        /* array of logos to copy     */
    00064 volatile short     Nget;           /* number of logos in getlogo */
    00065 volatile unsigned  MaxMsgSize;     /* size of message buffer     */
    00066 volatile char     *Message;        /* message buffer             */
    00067 static unsigned char MyModuleId;   /* module id of main thread   */
    00068 unsigned char      MyInstid;       /* instid of main thread      */
    00069 unsigned char      TypeError;      /* type for error messages    */
    00070
    00071 /******************** function tport_create *************************/
    00072 /*         Create a shared memory region & its semaphore,           */
    00073 /*           attach to it and initialize header values.             */
    00074 /********************************************************************/
    00075 void tport_create( SHM_INFO *region,   /* info structure for memory region  */
    00076                    long      nbytes,   /* size of shared memory region      */
    00077                    long      memkey )  /* key to shared memory region       */
    00078 {
    00079    SHM_HEAD       *shm;       /* pointer to start of memory region */
    00080    HANDLE         hshare;     // Handle to memory shared file
    00081    HANDLE         hmutex;     // Handle to mutex object
    00082    char           share[20];  // Shared file name from memkey
    00083    char           mutex[20];  // Mutex name
    00084    int            err;        // Error code from GetLastError()
    00085
    00086 /**** Create shared memory region ****/
    00087    sprintf(share, "SHR_%ld", memkey);
    00088    hshare = CreateFileMapping(
    00089       (HANDLE)0xFFFFFFFF,  // Request memory file (swap space)
    00090       NULL,                // Security attributes
    00091       PAGE_READWRITE,      // Access restrictions
    00092       0,                   // High order size (for very large mappings)
    00093       nbytes,              // Low order size
    00094       share);              // Name of file for other processes
    00095    if ( hshare == NULL )
    00096    {
    00097       err = GetLastError();
    00098       tport_syserr( "CreateFileMapping", err);
    00099    }
    00100
    00101 /**** Attach to shared memory region ****/
    00102    shm = (SHM_HEAD *) MapViewOfFile(
    00103       hshare,              // File object to map
    00104       FILE_MAP_WRITE,      // Access desired
    00105       0,                   // High-order 32 bits of file offset
    00106       0,                   // Low-order 32 bits of file offset
    00107       nbytes);             // Number of bytes to map
    00108    if ( shm == NULL )
    00109    {
    00110       err = GetLastError();
    00111       tport_syserr( "MapViewOfFile", err );
    00112    }
    00113
    00114 /**** Initialize shared memory region header ****/
    00115    shm->nbytes = nbytes;
    00116    shm->keymax = nbytes - sizeof(SHM_HEAD);
    00117    shm->keyin  = sizeof(SHM_HEAD);
    00118    shm->keyold = shm->keyin;
    00119    shm->flag   = 0;
    00120
    00121 /**** Make semaphore for this shared memory region & set semval = SHM_FREE ****/
    00122    sprintf(mutex, "MTX_%ld", memkey);
    00123    hmutex = CreateMutex(
    00124       NULL,                // Security attributes
    00125       FALSE,               // Initial ownership
    00126       mutex);              // Name of mutex (derived from memkey)
    00127    if ( hmutex == NULL )
    00128    {
    00129       err = GetLastError();
    00130       tport_syserr( "CreateMutex", err);
    00131    }
    00132
    00133 /**** set values in the shared memory information structure ****/
    00134    region->addr = shm;
    00135    region->hShare = hshare;
    00136    region->hMutex = hmutex;
    00137    region->key  = memkey;
    00138 }
    00139
    00140
    00141 /******************** function tport_destroy *************************/
    00142 /*                Destroy a shared memory region.                    */
    00143 /*********************************************************************/
    00144
    00145 void tport_destroy( SHM_INFO *region )
    00146 {
    00147    int err;
    00148
    00149 /***** Set kill flag, give other attached programs time to terminate ****/
    00150
    00151    tport_putflag( region, TERMINATE );
    00152    Sleep( 1000 );
    00153
    00154 /***** Detach from shared memory region *****/
    00155    if(!UnmapViewOfFile( region->addr )) {
    00156       err = GetLastError();
    00157       tport_syserr( "UnmapViewOfFile", err);
    00158    }
    00159
    00160 /***** Destroy semaphore set for shared memory region *****/
    00161    if(!CloseHandle(region->hMutex)) {
    00162       err = GetLastError();
    00163       tport_syserr( "CloseHandle (mutex)", err);
    00164    }
    00165
    00166
    00167 /***** Destroy shared memory region *****/
    00168    if(!CloseHandle(region->hShare)) {
    00169       err = GetLastError();
    00170       tport_syserr( "CloseHandle (share)", err);
    00171    }
    00172 }
    00173
    00174 /******************** function tport_attach *************************/
    00175 /*            Map to an existing shared memory region.              */
    00176 /********************************************************************/
    00177
    00178 void tport_attach( SHM_INFO *region,   /* info structure for memory region  */
    00179                    long      memkey )  /* key to shared memory region       */
    00180 {
    00181    SHM_HEAD       *shm;       /* pointer to start of memory region */
    00182    HANDLE         hshare;     // Handle to memory shared file
    00183    HANDLE         hmutex;     // Handle to mutex object
    00184    char           share[20];  // Shared file name from memkey
    00185    char           mutex[20];  // Mutex name
    00186    int            err;        // Error code from GetLastError()
    00187
    00188 /**** Create shared memory region ****/
    00189    sprintf(share, "SHR_%ld", memkey);
    00190    hshare = OpenFileMapping(
    00191        FILE_MAP_WRITE,
    00192        TRUE,
    00193        share);
    00194    if ( hshare == NULL )
    00195    {
    00196       err = GetLastError();
    00197       tport_syserr( "OpenFileMapping", err);
    00198    }
    00199
    00200 /**** Attach to shared memory region ****/
    00201    shm = (SHM_HEAD *) MapViewOfFile(
    00202       hshare,              // File object to map
    00203       FILE_MAP_WRITE,      // Access desired
    00204       0,                   // High-order 32 bits of file offset
    00205       0,                   // Low-order 32 bits of file offset
    00206       0);                  // Number of bytes to map
    00207    if ( shm == NULL )
    00208    {
    00209       err = GetLastError();
    00210       tport_syserr( "MapViewOfFile", err );
    00211    }
    00212
    00213 /**** Make semaphore for this shared memory region & set semval = SHM_FREE ****/
    00214    sprintf(mutex, "MTX_%ld", memkey);
    00215    hmutex = CreateMutex(
    00216       NULL,                // Security attributes
    00217       FALSE,               // Initial ownership
    00218       mutex);              // Name of mutex (derived from memkey)
    00219    if ( hmutex == NULL )
    00220    {
    00221       err = GetLastError();
    00222       tport_syserr( "CreateMutex", err);
    00223    }
    00224
    00225 /**** set values in the shared memory information structure ****/
    00226    region->addr = shm;
    00227    region->hShare = hshare;
    00228    region->hMutex = hmutex;
    00229    region->key  = memkey;
    00230 }
    00231
    00232 /******************** function tport_detach **************************/
    00233 /*                Detach from a shared memory region.                */
    00234 /*********************************************************************/
    00235
    00236 void tport_detach( SHM_INFO *region )
    00237 {
    00238    int err;
    00239
    00240 /***** Detach from shared memory region *****/
    00241    if(!UnmapViewOfFile( region->addr )) {
    00242       err = GetLastError();
    00243       tport_syserr( "UnmapViewOfFile", err);
    00244    }
    00245
    00246 /***** Destroy semaphore set for shared memory region *****/
    00247    if(!CloseHandle(region->hMutex)) {
    00248       err = GetLastError();
    00249       tport_syserr( "CloseHandle (mutex)", err);
    00250    }
    00251
    00252
    00253 /***** Destroy shared memory region *****/
    00254    if(!CloseHandle(region->hShare)) {
    00255       err = GetLastError();
    00256       tport_syserr( "CloseHandle (share)", err);
    00257    }
    00258 }
    00259
    00260
    00261
    00262 /*********************** function tport_putmsg ***********************/
    00263 /*            Put a message into a shared memory region.             */
    00264 /*            Assigns a transport-layer sequence number.             */
    00265 /*********************************************************************/
    00266
    00267 int tport_putmsg( SHM_INFO *region,    /* info structure for memory region    */
    00268                   MSG_LOGO *putlogo,   /* type, module, instid of incoming msg */
    00269                   long      length,    /* size of incoming message            */
    00270                   char     *msg )      /* pointer to incoming message         */
    00271 {
    00272    volatile static MSG_TRACK  trak[NTRACK_PUT];   /* sequence number keeper   */
    00273    volatile static int        nlogo;              /* # of logos seen so far   */
    00274    int                        it;                 /* index into trak          */
    00275    SHM_HEAD         *shm;              /* pointer to start of memory region   */
    00276    char             *ring;             /* pointer to ring part of memory      */
    00277    unsigned long     ir;               /* index into memory ring              */
    00278    long              nfill;            /* # bytes from ir to ring's last-byte */
    00279    long              nwrap;            /* # bytes to wrap to front of ring    */
    00280    TPORT_HEAD        hd;               /* transport layer header to put       */
    00281    char             *h;                /* pointer to transport layer header   */
    00282    TPORT_HEAD        old;              /* transport header of oldest msg      */
    00283    char             *o;                /* pointer to oldest transport header  */
    00284    int j;
    00285    int retval = PUT_OK;                /* return value for this function      */
    00286
    00287 /**** First time around, init the sequence counters, semaphore controls ****/
    00288
    00289    if (Put_Init)
    00290    {
    00291        nlogo    = 0;
    00292
    00293        for( j=0 ; j < NTRACK_PUT ; j++ )
    00294        {
    00295           trak[j].memkey      = 0;
    00296           trak[j].logo.type   = 0;
    00297           trak[j].logo.mod    = 0;
    00298           trak[j].logo.instid = 0;
    00299           trak[j].seq         = 0;
    00300           trak[j].keyout      = 0;
    00301        }
    00302
    00303        Put_Init = 0;
    00304    }
    00305
    00306 /**** Set up pointers for shared memory, etc. ****/
    00307
    00308    shm  = region->addr;
    00309    ring = (char *) shm + sizeof(SHM_HEAD);
    00310    h    = (char *) (&hd);
    00311    o    = (char *) (&old);
    00312
    00313 /**** First, see if the incoming message will fit in the memory region ****/
    00314
    00315    if ( length + sizeof(TPORT_HEAD) > shm->keymax )
    00316    {
    00317       fprintf( stdout,
    00318               "ERROR: tport_putmsg; message too large (%ld) for Region %ld\n",
    00319                length, region->key);
    00320       return( PUT_TOOBIG );
    00321    }
    00322
    00323 /**** Change semaphore; let others know you're using tracking structure & memory  ****/
    00324
    00325    WaitForSingleObject(region->hMutex, INFINITE);
    00326
    00327 /**** Next, find incoming logo in list of combinations already seen ****/
    00328
    00329    for( it=0 ; it < nlogo ; it++ )
    00330    {
    00331       if ( region->key     != trak[it].memkey     )  continue;
    00332       if ( putlogo->type   != trak[it].logo.type  )  continue;
    00333       if ( putlogo->mod    != trak[it].logo.mod   )  continue;
    00334       if ( putlogo->instid != trak[it].logo.instid ) continue;
    00335       goto build_header;
    00336    }
    00337
    00338 /**** Incoming logo is a new combination; store it, if there's room ****/
    00339
    00340    if ( nlogo == NTRACK_PUT )
    00341    {
    00342       fprintf( stdout,
    00343               "ERROR: tport_putmsg; exceeded NTRACK_PUT, msg not sent\n");
    00344       retval = PUT_NOTRACK;
    00345       goto release_semaphore;
    00346    }
    00347    it = nlogo;
    00348    trak[it].memkey =  region->key;
    00349    trak[it].logo   = *putlogo;
    00350    nlogo++;
    00351
    00352 /**** Store everything you need in the transport header ****/
    00353
    00354 build_header:
    00355    hd.start = FIRST_BYTE;
    00356    hd.size  = length;
    00357    hd.logo  = trak[it].logo;
    00358    hd.seq   = trak[it].seq++;
    00359
    00360 /**** In shared memory, see if keyin will wrap; if so, reset keyin and keyold ****/
    00361
    00362    if ( shm->keyin + sizeof(TPORT_HEAD) + length  <  shm->keyold )
    00363    {
    00364        shm->keyin  = shm->keyin  % shm->keymax;
    00365        shm->keyold = shm->keyold % shm->keymax;
    00366        if ( shm->keyin <= shm->keyold ) shm->keyin += shm->keymax;
    00367      /*fprintf( stdout,
    00368                "NOTICE: tport_putmsg; keyin wrapped & reset; Region %ld\n",
    00369                 region->key );*/
    00370    }
    00371
    00372 /**** Then see if there's enough room for new message in shared memory ****/
    00373 /****      If not, "delete" oldest messages until there's room         ****/
    00374
    00375    while( shm->keyin + sizeof(TPORT_HEAD) + length - shm->keyold > shm->keymax )
    00376    {
    00377       ir = shm->keyold % shm->keymax;
    00378       if ( ring[ir] != FIRST_BYTE )
    00379       {
    00380           fprintf( stdout,
    00381                   "ERROR: tport_putmsg; keyold not at FIRST_BYTE, Region %ld\n",
    00382                    region->key );
    00383           retval = TPORT_FATAL;
    00384           goto release_semaphore;
    00385       }
    00386       for ( j=0 ; j < sizeof(TPORT_HEAD) ; j++ )
    00387       {
    00388          if ( ir >= shm->keymax )   ir -= shm->keymax;
    00389          o[j] = ring[ir++];
    00390       }
    00391       shm->keyold += sizeof(TPORT_HEAD) + old.size;
    00392    }
    00393
    00394 /**** Now copy transport header into shared memory by chunks... ****/
    00395
    00396    ir = shm->keyin % shm->keymax;
    00397    nwrap = ir + sizeof(TPORT_HEAD) - shm->keymax;
    00398    if ( nwrap <= 0 )
    00399    {
    00400          memcpy( (void *) &ring[ir], (void *) h, sizeof(TPORT_HEAD) );
    00401    }
    00402    else
    00403    {
    00404          nfill = sizeof(TPORT_HEAD) - nwrap;
    00405          memcpy( (void *) &ring[ir], (void *) &h[0],     nfill );
    00406          memcpy( (void *) &ring[0],  (void *) &h[nfill], nwrap );
    00407    }
    00408    ir += sizeof(TPORT_HEAD);
    00409    if ( ir >= shm->keymax )  ir -= shm->keymax;
    00410
    00411 /**** ...and copy message into shared memory by chunks ****/
    00412
    00413    nwrap = ir + length - shm->keymax;
    00414    if ( nwrap <= 0 )
    00415    {
    00416          memcpy( (void *) &ring[ir], (void *) msg, length );
    00417    }
    00418    else
    00419    {
    00420          nfill = length - nwrap;
    00421          memcpy( (void *) &ring[ir], (void *) &msg[0],     nfill );
    00422          memcpy( (void *) &ring[0],  (void *) &msg[nfill], nwrap );
    00423    }
    00424    shm->keyin += sizeof(TPORT_HEAD) + length;
    00425
    00426 /**** Finished with shared memory, let others know via semaphore ****/
    00427
    00428 release_semaphore:
    00429    ReleaseMutex(region->hMutex);
    00430
    00431    if( retval == TPORT_FATAL ) exit( 1 );
    00432    return( retval );
    00433 }
    00434
    00435
    00436 /*********************** function tport_getmsg ***********************/
    00437 /*                 Get a message out of shared memory.               */
    00438 /*********************************************************************/
    00439
    00440 int tport_getmsg( SHM_INFO  *region,   /* info structure for memory region  */
    00441                   MSG_LOGO  *getlogo,  /* requested logo(s)                 */
    00442                   short      nget,     /* number of logos in getlogo        */
    00443                   MSG_LOGO  *logo,     /* logo of retrieved msg             */
    00444                   long      *length,   /* size of retrieved message         */
    00445                   char      *msg,      /* retrieved message                 */
    00446                   long       maxsize ) /* max length for retrieved message  */
    00447 {
    00448    static MSG_TRACK  trak[NTRACK_GET]; /* sequence #, outpointer keeper     */
    00449    static int        nlogo;            /* # modid,type,instid combos so far */
    00450    int               it;               /* index into trak                   */
    00451    SHM_HEAD         *shm;              /* pointer to start of memory region */
    00452    char             *ring;             /* pointer to ring part of memory    */
    00453    TPORT_HEAD       *tmphd;            /* temp pointer into shared memory   */
    00454    unsigned long     ir;               /* index into the ring               */
    00455    long              nfill;            /* bytes from ir to ring's last-byte */
    00456    long              nwrap;            /* bytes to grab from front of ring  */
    00457    TPORT_HEAD        hd;               /* transport header from memory      */
    00458    char             *h;                /* pointer to transport layer header */
    00459    int               ih;               /* index into the transport header   */
    00460    unsigned long     keyin;            /* in-pointer to shared memory       */
    00461    unsigned long     keyold;           /* oldest complete message in memory */
    00462    unsigned long     keyget;           /* pointer at which to start search  */
    00463    int               status = GET_OK;  /* how did retrieval go?             */
    00464    int               trakked;          /* flag for trakking list entries    */
    00465    int               i,j;
    00466
    00467 /**** Get the pointers set up ****/
    00468
    00469    shm  = region->addr;
    00470    ring = (char *) shm + sizeof(SHM_HEAD);
    00471    h    = (char *) (&hd);
    00472
    00473 /**** First time around, initialize sequence counters, outpointers ****/
    00474
    00475    if (Get_Init)
    00476    {
    00477        nlogo = 0;
    00478
    00479        for( i=0 ; i < NTRACK_GET ; i++ )
    00480        {
    00481           trak[i].memkey      = 0;
    00482           trak[i].logo.type   = 0;
    00483           trak[i].logo.mod    = 0;
    00484           trak[i].logo.instid = 0;
    00485           trak[i].seq         = 0;
    00486           trak[i].keyout      = 0;
    00487           trak[i].active      = 0; /*960618:ldd*/
    00488        }
    00489        Get_Init = 0;
    00490    }
    00491
    00492 /**** make sure all requested logos are entered in tracking list ****/
    00493
    00494    for ( j=0 ; j < nget ; j++ )  /* for all requested message logos */
    00495    {
    00496        trakked = 0;  /* assume it's not being trakked */
    00497        for( it=0 ; it < nlogo ; it++ )  /* for all logos we're tracking */
    00498        {
    00499           if( region->key       != trak[it].memkey      ) continue;
    00500           if( getlogo[j].type   != trak[it].logo.type   ) continue;
    00501           if( getlogo[j].mod    != trak[it].logo.mod    ) continue;
    00502           if( getlogo[j].instid != trak[it].logo.instid ) continue;
    00503           trakked = 1;  /* found it in the trakking list! */
    00504           break;
    00505        }
    00506        if( trakked ) continue;
    00507     /* Make an entry in trak for this logo; if there's room */
    00508        if ( nlogo < NTRACK_GET )
    00509        {
    00510           it = nlogo;
    00511           trak[it].memkey = region->key;
    00512           trak[it].logo   = getlogo[j];
    00513           nlogo++;
    00514        }
    00515    }
    00516
    00517 /**** find latest starting index to look for any of the requested logos ****/
    00518
    00519 findkey:
    00520
    00521    keyget = shm->keyold;
    00522
    00523    for ( it=0 ; it < nlogo ; it++ )  /* for all message logos we're tracking */
    00524    {
    00525        if ( trak[it].memkey != region->key ) continue;
    00526        for ( j=0 ; j < nget ; j++ )  /* for all requested message logos */
    00527        {
    00528           if((getlogo[j].type   == trak[it].logo.type   || getlogo[j].type==WILD  ) &&
    00529              (getlogo[j].mod    == trak[it].logo.mod    || getlogo[j].mod==WILD   ) &&
    00530              (getlogo[j].instid == trak[it].logo.instid || getlogo[j].instid==WILD) )
    00531           {
    00532              if ( trak[it].keyout > keyget )  keyget = trak[it].keyout;
    00533           }
    00534        }
    00535     }
    00536     keyin = shm->keyin;
    00537
    00538 /**** See if keyin and keyold were wrapped and reset by tport_putmsg; ****/
    00539 /****       If so, reset trak[xx].keyout and go back to findkey       ****/
    00540
    00541    if ( keyget > keyin )
    00542    {
    00543       keyold = shm->keyold;
    00544       for ( it=0 ; it < nlogo ; it++ )
    00545       {
    00546          if( trak[it].memkey == region->key )
    00547          {
    00548           /* reset keyout */
    00549 /*DEBUG*/    /*printf("tport_getmsg: Pre-reset:  keyout=%10u    keyold=%10u  keyin=%10u\n",
    00550                      trak[it].keyout, keyold, keyin );*/
    00551              trak[it].keyout = trak[it].keyout % shm->keymax;
    00552 /*DEBUG*/    /*printf("tport_getmsg:  Intermed:  keyout=%10u    keyold=%10u  keyin=%10u\n",
    00553                      trak[it].keyout, keyold, keyin );*/
    00554
    00555           /* make sure new keyout points to keyin or to a msg's first-byte; */
    00556           /* if not, we've been lapped, so set keyout to keyold             */
    00557              ir    = trak[it].keyout;
    00558              tmphd = (TPORT_HEAD *) &ring[ir];
    00559              if ( trak[it].keyout == keyin   ||
    00560                   (keyin-trak[it].keyout)%shm->keymax == 0 )
    00561              {
    00562 /*DEBUG*/       /*printf("tport_getmsg:  Intermed:  keyout=%10u  same as keyin\n",
    00563                        trak[it].keyout );*/
    00564                 trak[it].keyout = keyin;
    00565              }
    00566              else if( tmphd->start != FIRST_BYTE )
    00567              {
    00568 /*DEBUG*/       /*printf("tport_getmsg:  Intermed:  keyout=%10u  does not point to FIRST_BYTE\n",
    00569                         trak[it].keyout );*/
    00570                 trak[it].keyout = keyold;
    00571              }
    00572
    00573           /* else, make sure keyout's value is between keyold and keyin */
    00574              else if ( trak[it].keyout < keyold )
    00575              {
    00576                 do {
    00577                     trak[it].keyout += shm->keymax;
    00578                 } while ( trak[it].keyout < keyold );
    00579              }
    00580 /*DEBUG*/    /*printf("tport_getmsg:     Reset:  keyout=%10u    keyold=%10u  keyin=%10u\n",
    00581                      trak[it].keyout, keyold, keyin );*/
    00582          }
    00583       }
    00584     /*fprintf( stdout,
    00585           "NOTICE: tport_getmsg; keyin wrapped, keyout(s) reset; Region %ld\n",
    00586            region->key );*/
    00587
    00588       goto findkey;
    00589    }
    00590
    00591
    00592 /**** Find next message from requested type, module, instid ****/
    00593
    00594 nextmsg:
    00595
    00596    while ( keyget < keyin )
    00597    {
    00598    /* make sure you haven't been lapped by tport_putmsg */
    00599        if ( keyget < shm->keyold ) keyget = shm->keyold;
    00600
    00601    /* load next header; make sure you weren't lapped */
    00602        ir = keyget % shm->keymax;
    00603        for ( ih=0 ; ih < sizeof(TPORT_HEAD) ; ih++ )
    00604        {
    00605           if ( ir >= shm->keymax )  ir -= shm->keymax;
    00606           h[ih] = ring[ir++];
    00607        }
    00608        if ( keyget < shm->keyold ) continue;  /*added 960612:ldd*/
    00609
    00610    /* make sure it starts at beginning of a header */
    00611        if ( hd.start != FIRST_BYTE )
    00612        {
    00613           fprintf( stdout,
    00614                   "ERROR: tport_getmsg; keyget not at FIRST_BYTE, Region %ld\n",
    00615                    region->key );
    00616           exit( 1 );
    00617        }
    00618        keyget += sizeof(TPORT_HEAD) + hd.size;
    00619
    00620    /* see if this msg matches any requested type */
    00621        for ( j=0 ; j < nget ; j++ )
    00622        {
    00623           if((getlogo[j].type   == hd.logo.type   || getlogo[j].type == WILD) &&
    00624              (getlogo[j].mod    == hd.logo.mod    || getlogo[j].mod  == WILD) &&
    00625              (getlogo[j].instid == hd.logo.instid || getlogo[j].instid == WILD) )
    00626           {
    00627
    00628 /**** Found a message of requested logo; retrieve it! ****/
    00629         /* complain if retreived msg is too big */
    00630              if ( hd.size > maxsize )
    00631              {
    00632                *logo   = hd.logo;
    00633                *length = hd.size;
    00634                 status = GET_TOOBIG;
    00635                 goto trackit;    /*changed 960612:ldd*/
    00636              }
    00637         /* copy message by chunks to caller's address */
    00638              nwrap = ir + hd.size - shm->keymax;
    00639              if ( nwrap <= 0 )
    00640              {
    00641                 memcpy( (void *) msg, (void *) &ring[ir], hd.size );
    00642              }
    00643              else
    00644              {
    00645                 nfill = hd.size - nwrap;
    00646                 memcpy( (void *) &msg[0],     (void *) &ring[ir], nfill );
    00647                 memcpy( (void *) &msg[nfill], (void *) &ring[0],  nwrap );
    00648              }
    00649         /* see if we got run over by tport_putmsg while copying msg */
    00650         /* if we did, go back and try to get a msg cleanly          */
    00651              keyold = shm->keyold;
    00652              if ( keyold >= keyget )
    00653              {
    00654                 keyget = keyold;
    00655                 goto nextmsg;
    00656              }
    00657
    00658         /* set other returned variables */
    00659             *logo   = hd.logo;
    00660             *length = hd.size;
    00661
    00662 trackit:
    00663         /* find msg logo in tracked list */
    00664              for ( it=0 ; it < nlogo ; it++ )
    00665              {
    00666                 if ( region->key    != trak[it].memkey      )  continue;
    00667                 if ( hd.logo.type   != trak[it].logo.type   )  continue;
    00668                 if ( hd.logo.mod    != trak[it].logo.mod    )  continue;
    00669                 if ( hd.logo.instid != trak[it].logo.instid )  continue;
    00670                 /* activate sequence tracking if 1st msg */
    00671                 if ( !trak[it].active )
    00672                 {
    00673                     trak[it].seq    = hd.seq;
    00674                     trak[it].active = 1;
    00675                 }
    00676                 goto sequence;
    00677              }
    00678         /* new logo, track it if there's room */
    00679              if ( nlogo == NTRACK_GET )
    00680              {
    00681                 fprintf( stdout,
    00682                      "ERROR: tport_getmsg; exceeded NTRACK_GET\n");
    00683                 if( status != GET_TOOBIG ) status = GET_NOTRACK; /*changed 960612:ldd*/
    00684                 goto wrapup;
    00685              }
    00686              it = nlogo;
    00687              trak[it].memkey = region->key;
    00688              trak[it].logo   = hd.logo;
    00689              trak[it].seq    = hd.seq;
    00690              trak[it].active = 1;      /*960618:ldd*/
    00691              nlogo++;
    00692
    00693 sequence:
    00694         /* check if sequence #'s match; update sequence # */
    00695              if ( status == GET_TOOBIG   )  goto wrapup; /*added 960612:ldd*/
    00696              if ( hd.seq != trak[it].seq )
    00697              {
    00698                 status = GET_MISS;
    00699                 trak[it].seq = hd.seq;
    00700              }
    00701              trak[it].seq++;
    00702
    00703         /* Ok, we're finished grabbing this one */
    00704              goto wrapup;
    00705
    00706           } /* end if of logo & getlogo match */
    00707        }    /* end for over getlogo */
    00708    }        /* end while over ring */
    00709
    00710 /**** If you got here, there were no messages of requested logo(s) ****/
    00711
    00712    status = GET_NONE;
    00713
    00714 /**** update outpointer (->msg after retrieved one) for all requested logos ****/
    00715
    00716 wrapup:
    00717    for ( it=0 ; it < nlogo ; it++ )  /* for all message logos we're tracking */
    00718    {
    00719        if ( trak[it].memkey != region->key ) continue;
    00720        for ( j=0 ; j < nget ; j++ )  /* for all requested message logos */
    00721        {
    00722           if((getlogo[j].type   == trak[it].logo.type   || getlogo[j].type==WILD) &&
    00723              (getlogo[j].mod    == trak[it].logo.mod    || getlogo[j].mod==WILD)  &&
    00724              (getlogo[j].instid == trak[it].logo.instid || getlogo[j].instid==WILD) )
    00725           {
    00726              trak[it].keyout = keyget;
    00727           }
    00728        }
    00729     }
    00730
    00731    return( status );
    00732
    00733 }
    00734
    00735
    00736 /********************* function tport_putflag ************************/
    00737 /*           Puts the kill flag into a shared memory region.         */
    00738 /*********************************************************************/
    00739
    00740 void tport_putflag( SHM_INFO *region,  /* shared memory info structure     */
    00741                     int       flag )   /* tells attached processes to exit */
    00742 {
    00743    SHM_HEAD  *shm;
    00744
    00745    shm = region->addr;
    00746    shm->flag = flag;
    00747    return;
    00748 }
    00749
    00750
    00751
    00752 /*********************** function tport_getflag **********************/
    00753 /*         Returns the kill flag from a shared memory region.        */
    00754 /*********************************************************************/
    00755
    00756 int tport_getflag( SHM_INFO *region )
    00757
    00758 {
    00759    SHM_HEAD  *shm;
    00760
    00761    shm = region->addr;
    00762    return( (int)shm->flag );
    00763 }
    00764
    00765
    00766 /************************** tport_bufthr ****************************/
    00767 /*     Thread to buffer input from one transport ring to another.   */
    00768 /********************************************************************/
    00769 void tport_bufthr( void *dummy )
    00770 {
    00771    char          errnote[150];
    00772    MSG_LOGO      logo;
    00773    long          msgsize;
    00774    unsigned char msgseq;
    00775    int           res1, res2;
    00776    int           gotmsg;
    00777    HANDLE myHandle = GetCurrentThread();
    00778
    00779 /* Reset my own thread priority
    00780    ****************************/
    00781    if ( SetThreadPriority( myHandle, THREAD_PRIORITY_TIME_CRITICAL ) == 0 )
    00782    {
    00783       printf( "Error setting buffer thread priority: %d\n", GetLastError() );
    00784       exit( -1 );
    00785    }
    00786
    00787 /* Flush all existing messages from the public memory region
    00788    *********************************************************/
    00789    while( tport_copyfrom((SHM_INFO *) PubRegion, (MSG_LOGO *) Getlogo,
    00790                           Nget, &logo, &msgsize, (char *) Message,
    00791                           MaxMsgSize, &msgseq )  !=  GET_NONE  );
    00792
    00793    while ( 1 )
    00794    {
    00795       Sleep( 500 );
    00796
    00797 /* If a terminate flag is found, copy it to the private ring.
    00798    Then, terminate this thread.
    00799    *********************************************************/
    00800       if ( tport_getflag( (SHM_INFO *) PubRegion ) == TERMINATE )
    00801       {
    00802          tport_putflag( (SHM_INFO *) BufRegion, TERMINATE );
    00803          _endthread();
    00804       }
    00805
    00806 /* Try to copy a message from the public memory region
    00807    ***************************************************/
    00808       do
    00809       {
    00810           res1 = tport_copyfrom((SHM_INFO *) PubRegion, (MSG_LOGO *) Getlogo,
    00811                                 Nget, &logo, &msgsize, (char *) Message,
    00812                                 MaxMsgSize, &msgseq );
    00813           gotmsg = 1;
    00814
    00815 /* Handle return values
    00816    ********************/
    00817           switch ( res1 )
    00818           {
    00819           case GET_MISS_LAPPED:
    00820                 sprintf( errnote,
    00821                         "tport_bufthr: Missed msg(s)  c%d m%d t%d  Overwritten, region:%ld.",
    00822                          (int) logo.instid, (int) logo.mod, (int) logo.type,
    00823                          PubRegion->key );
    00824                 tport_buferror( ERR_LAPPED, errnote );
    00825                 break;
    00826           case GET_MISS_SEQGAP:
    00827                 sprintf( errnote,
    00828                         "tport_bufthr: Missed msg(s)  c%d m%d t%d  Sequence gap, region:%ld.",
    00829                          (int) logo.instid, (int) logo.mod, (int) logo.type,
    00830                          PubRegion->key );
    00831                 tport_buferror( ERR_SEQGAP, errnote );
    00832                 break;
    00833           case GET_NOTRACK:
    00834                 sprintf( errnote,
    00835                         "tport_bufthr: Logo c%d m%d t%d not tracked; NTRACK_GET exceeded.",
    00836                         (int) logo.instid, (int) logo.mod, (int) logo.type );
    00837                 tport_buferror( ERR_UNTRACKED, errnote );
    00838           case GET_OK:
    00839                 break;
    00840           case GET_TOOBIG:
    00841                 sprintf( errnote,
    00842                         "tport_bufthr: msg[%ld] c%d m%d t%d seq%d too big; skipped in region:%ld.",
    00843                          msgsize, (int) logo.instid, (int) logo.mod,
    00844                          (int) logo.type, (int) msgseq, PubRegion->key );
    00845                 tport_buferror( ERR_OVERFLOW, errnote );
    00846           case GET_NONE:
    00847                 gotmsg = 0;
    00848                 break;
    00849           }
    00850
    00851 /* If you did get a message, copy it to private ring
    00852    *************************************************/
    00853           if ( gotmsg )
    00854           {
    00855               res2 = tport_copyto( (SHM_INFO *) BufRegion, &logo,
    00856                                    msgsize, (char *) Message, msgseq );
    00857               switch (res2)
    00858               {
    00859               case PUT_TOOBIG:
    00860                  sprintf( errnote,
    00861                      "tport_bufthr: msg[%ld] (c%d m%d t%d) too big for Region:%ld.",
    00862                       msgsize, (int) logo.instid, (int) logo.mod, (int) logo.type,
    00863                       BufRegion->key );
    00864                  tport_buferror( ERR_OVERFLOW, errnote );
    00865               case PUT_OK:
    00866                  break;
    00867               }
    00868           }
    00869       } while ( res1 != GET_NONE );
    00870    }
    00871 }
    00872
    00873
    00874 /************************** tport_buffer ****************************/
    00875 /*       Function to initialize the input buffering thread          */
    00876 /********************************************************************/
    00877 int tport_buffer( SHM_INFO  *region1,      /* transport ring             */
    00878                   SHM_INFO  *region2,      /* private ring               */
    00879                   MSG_LOGO  *getlogo,      /* array of logos to copy     */
    00880                   short      nget,         /* number of logos in getlogo */
    00881                   unsigned   maxMsgSize,   /* size of message buffer     */
    00882                   unsigned char module,    /* module id of main thread   */
    00883                   unsigned char instid )   /* instid id of main thread   */
    00884 {
    00885    unsigned long thread_id;            /* Thread id of the buffer thread */
    00886
    00887 /* Allocate message buffer
    00888    ***********************/
    00889    Message = (char *) malloc( maxMsgSize );
    00890    if ( Message == NULL )
    00891    {
    00892       fprintf( stdout, "tport_buffer: Error allocating message buffer\n" );
    00893       return -1;
    00894    }
    00895
    00896 /* Copy function arguments to global variables
    00897    *******************************************/
    00898    PubRegion   = region1;
    00899    BufRegion   = region2;
    00900    Getlogo     = getlogo;
    00901    Nget        = nget;
    00902    MaxMsgSize  = maxMsgSize;
    00903    MyModuleId  = module;
    00904    MyInstid    = instid;
    00905
    00906 /* Lookup message type for error messages
    00907    **************************************/
    00908    if ( GetType( "TYPE_ERROR", &TypeError ) != 0 )
    00909    {
    00910       fprintf( stderr,
    00911               "tport_buffer: Invalid message type <TYPE_ERROR>\n" );
    00912       return -1;
    00913    }
    00914
    00915 /* Start the input buffer thread
    00916    *****************************/
    00917    thread_id = _beginthread( tport_bufthr, 0, NULL );
    00918
    00919    if ( thread_id == -1 )                /* Couldn't create thread */
    00920    {
    00921       fprintf( stderr, "tport_buffer: Can't start the buffer thread." );
    00922       return -1;
    00923    }
    00924    return 0;
    00925 }
    00926
    00927
    00928 /********************** function tport_copyfrom *********************/
    00929 /*      get a message out of public shared memory; save the         */
    00930 /*     sequence number from the transport layer, with the intent    */
    00931 /*       of copying it to a private (buffering) memory ring         */
    00932 /********************************************************************/
    00933
    00934 int tport_copyfrom( SHM_INFO  *region,   /* info structure for memory region */
    00935                     MSG_LOGO  *getlogo,  /* requested logo(s)                */
    00936                     short      nget,     /* number of logos in getlogo       */
    00937                     MSG_LOGO  *logo,     /* logo of retrieved message        */
    00938                     long      *length,   /* size of retrieved message        */
    00939                     char      *msg,      /* retrieved message                */
    00940                     long       maxsize,  /* max length for retrieved message */
    00941                     unsigned char *seq ) /* TPORT_HEAD seq# of retrieved msg */
    00942 {
    00943    static MSG_TRACK  trak[NTRACK_GET]; /* sequence #, outpointer keeper     */
    00944    static int        nlogo;            /* # modid,type,instid combos so far */
    00945    int               it;               /* index into trak                   */
    00946    SHM_HEAD         *shm;              /* pointer to start of memory region */
    00947    char             *ring;             /* pointer to ring part of memory    */
    00948    TPORT_HEAD       *tmphd;            /* temp pointer into shared memory   */
    00949    unsigned long     ir;               /* index into the ring               */
    00950    long              nfill;            /* bytes from ir to ring's last-byte */
    00951    long              nwrap;            /* bytes to grab from front of ring  */
    00952    TPORT_HEAD        hd;               /* transport header from memory      */
    00953    char             *h;                /* pointer to transport layer header */
    00954    int               ih;               /* index into the transport header   */
    00955    unsigned long     keyin;            /* in-pointer to shared memory       */
    00956    unsigned long     keyold;           /* oldest complete message in memory */
    00957    unsigned long     keyget;           /* pointer at which to start search  */
    00958    int               status = GET_OK;  /* how did retrieval go?             */
    00959    int               lapped = 0;       /* = 1 if memory ring has been over- */
    00960                                        /* written since last tport_copyfrom */
    00961    int               trakked;          /* flag for trakking list entries    */
    00962    int               i,j;
    00963
    00964 /**** Get the pointers set up ****/
    00965
    00966    shm  = region->addr;
    00967    ring = (char *) shm + sizeof(SHM_HEAD);
    00968    h    = (char *) (&hd);
    00969
    00970 /**** First time around, initialize sequence counters, outpointers ****/
    00971
    00972    if (Copyfrom_Init)
    00973    {
    00974        nlogo = 0;
    00975
    00976        for( i=0 ; i < NTRACK_GET ; i++ )
    00977        {
    00978           trak[i].memkey      = 0;
    00979           trak[i].logo.type   = 0;
    00980           trak[i].logo.mod    = 0;
    00981           trak[i].logo.instid = 0;
    00982           trak[i].seq         = 0;
    00983           trak[i].keyout      = 0;
    00984           trak[i].active      = 0; /*960618:ldd*/
    00985        }
    00986        Copyfrom_Init = 0;
    00987    }
    00988
    00989 /**** make sure all requested logos are entered in tracking list ****/
    00990
    00991    for ( j=0 ; j < nget ; j++ )  /* for all requested message logos */
    00992    {
    00993        trakked = 0;  /* assume it's not being trakked */
    00994        for( it=0 ; it < nlogo ; it++ )  /* for all logos we're tracking */
    00995        {
    00996           if( region->key       != trak[it].memkey      ) continue;
    00997           if( getlogo[j].type   != trak[it].logo.type   ) continue;
    00998           if( getlogo[j].mod    != trak[it].logo.mod    ) continue;
    00999           if( getlogo[j].instid != trak[it].logo.instid ) continue;
    01000           trakked = 1;  /* found it in the trakking list! */
    01001           break;
    01002        }
    01003        if( trakked ) continue;
    01004     /* Make an entry in trak for this logo; if there's room */
    01005        if ( nlogo < NTRACK_GET )
    01006        {
    01007           it = nlogo;
    01008           trak[it].memkey = region->key;
    01009           trak[it].logo   = getlogo[j];
    01010           nlogo++;
    01011        }
    01012    }
    01013
    01014 /**** find latest starting index to look for any of the requested logos ****/
    01015
    01016 findkey:
    01017
    01018    keyget = 0;
    01019
    01020    for ( it=0 ; it < nlogo ; it++ )  /* for all message logos we're tracking */
    01021    {
    01022        if ( trak[it].memkey != region->key ) continue;
    01023        for ( j=0 ; j < nget ; j++ )  /* for all requested message logos */
    01024        {
    01025           if((getlogo[j].type   == trak[it].logo.type   || getlogo[j].type==WILD) &&
    01026              (getlogo[j].mod    == trak[it].logo.mod    || getlogo[j].mod==WILD)  &&
    01027              (getlogo[j].instid == trak[it].logo.instid || getlogo[j].instid==WILD) )
    01028           {
    01029              if ( trak[it].keyout > keyget )  keyget = trak[it].keyout;
    01030           }
    01031        }
    01032    }
    01033
    01034 /**** make sure you haven't been lapped by tport_copyto or tport_putmsg ****/
    01035    if ( keyget < shm->keyold ) {
    01036       keyget = shm->keyold;
    01037       lapped = 1;
    01038    }
    01039
    01040 /**** See if keyin and keyold were wrapped and reset by tport_putmsg; ****/
    01041 /****       If so, reset trak[xx].keyout and go back to findkey       ****/
    01042
    01043    keyin = shm->keyin;
    01044    if ( keyget > keyin )
    01045    {
    01046       keyold = shm->keyold;
    01047       for ( it=0 ; it < nlogo ; it++ )
    01048       {
    01049          if( trak[it].memkey == region->key )
    01050          {
    01051           /* reset keyout */
    01052 /*DEBUG*/    /*printf("tport_copyfrom: Pre-reset:  keyout=%10u    keyold=%10u  keyin=%10u\n",
    01053                      trak[it].keyout, keyold, keyin );*/
    01054              trak[it].keyout = trak[it].keyout % shm->keymax;
    01055 /*DEBUG*/    /*printf("tport_copyfrom:  Intermed:  keyout=%10u    keyold=%10u  keyin=%10u\n",
    01056                      trak[it].keyout, keyold, keyin );*/
    01057
    01058           /* make sure new keyout points to keyin or to a msg's first-byte; */
    01059           /* if not, we've been lapped, so set keyout to keyold             */
    01060              ir    = trak[it].keyout;
    01061              tmphd = (TPORT_HEAD *) &ring[ir];
    01062              if ( trak[it].keyout == keyin   ||
    01063                   (keyin-trak[it].keyout)%shm->keymax == 0 )
    01064              {
    01065 /*DEBUG*/       /*printf("tport_copyfrom:  Intermed:  keyout=%10u  same as keyin\n",
    01066                         trak[it].keyout );*/
    01067                 trak[it].keyout = keyin;
    01068              }
    01069              else if( tmphd->start != FIRST_BYTE )
    01070              {
    01071 /*DEBUG*/       /*printf("tport_copyfrom:  Intermed:  keyout=%10u  does not point to FIRST_BYTE\n",
    01072                         trak[it].keyout );*/
    01073                 trak[it].keyout = keyold;
    01074                 lapped = 1;
    01075              }
    01076
    01077           /* else, make sure keyout's value is between keyold and keyin */
    01078              else if ( trak[it].keyout < keyold )
    01079              {
    01080                 do {
    01081                     trak[it].keyout += shm->keymax;
    01082                 } while ( trak[it].keyout < keyold );
    01083              }
    01084 /*DEBUG*/    /*printf("tport_copyfrom:     Reset:  keyout=%10u    keyold=%10u  keyin=%10u\n",
    01085                      trak[it].keyout, keyold, keyin );*/
    01086          }
    01087       }
    01088     /*fprintf( stdout,
    01089           "NOTICE: tport_copyfrom; keyin wrapped, keyout(s) reset; Region %ld\n",
    01090            region->key );*/
    01091
    01092       goto findkey;
    01093    }
    01094
    01095
    01096 /**** Find next message from requested type, module, instid ****/
    01097
    01098 nextmsg:
    01099
    01100    while ( keyget < keyin )
    01101    {
    01102    /* make sure you haven't been lapped by tport_copyto or tport_putmsg */
    01103        if ( keyget < shm->keyold ) {
    01104           keyget = shm->keyold;
    01105           lapped = 1;
    01106        }
    01107
    01108    /* load next header; make sure you weren't lapped */
    01109        ir = keyget % shm->keymax;
    01110        for ( ih=0 ; ih < sizeof(TPORT_HEAD) ; ih++ )
    01111        {
    01112           if ( ir >= shm->keymax )  ir -= shm->keymax;
    01113           h[ih] = ring[ir++];
    01114        }
    01115        if ( keyget < shm->keyold ) continue;  /*added 960612:ldd*/
    01116
    01117    /* make sure it starts at beginning of a header */
    01118        if ( hd.start != FIRST_BYTE )
    01119        {
    01120           fprintf( stdout,
    01121                   "ERROR: tport_copyfrom; keyget not at FIRST_BYTE, Region %ld\n",
    01122                    region->key );
    01123           exit( 1 );
    01124        }
    01125        keyget += sizeof(TPORT_HEAD) + hd.size;
    01126
    01127    /* see if this msg matches any requested type */
    01128        for ( j=0 ; j < nget ; j++ )
    01129        {
    01130           if((getlogo[j].type   == hd.logo.type   || getlogo[j].type == WILD) &&
    01131              (getlogo[j].mod    == hd.logo.mod    || getlogo[j].mod  == WILD) &&
    01132              (getlogo[j].instid == hd.logo.instid || getlogo[j].instid == WILD) )
    01133           {
    01134
    01135 /**** Found a message of requested logo; retrieve it! ****/
    01136         /* complain if retreived msg is too big */
    01137              if ( hd.size > maxsize )
    01138              {
    01139                *logo   = hd.logo;
    01140                *length = hd.size;
    01141                *seq    = hd.seq;
    01142                 status = GET_TOOBIG;
    01143                 goto trackit;    /*changed 960612:ldd*/
    01144              }
    01145         /* copy message by chunks to caller's address */
    01146              nwrap = ir + hd.size - shm->keymax;
    01147              if ( nwrap <= 0 )
    01148              {
    01149                 memcpy( (void *) msg, (void *) &ring[ir], hd.size );
    01150              }
    01151              else
    01152              {
    01153                 nfill = hd.size - nwrap;
    01154                 memcpy( (void *) &msg[0],     (void *) &ring[ir], nfill );
    01155                 memcpy( (void *) &msg[nfill], (void *) &ring[0],  nwrap );
    01156              }
    01157         /* see if we got lapped by tport_copyto or tport_putmsg while copying msg */
    01158         /* if we did, go back and try to get a msg cleanly          */
    01159              keyold = shm->keyold;
    01160              if ( keyold >= keyget )
    01161              {
    01162                 keyget = keyold;
    01163                 lapped = 1;
    01164                 goto nextmsg;
    01165              }
    01166
    01167         /* set other returned variables */
    01168             *logo   = hd.logo;
    01169             *length = hd.size;
    01170             *seq    = hd.seq;
    01171
    01172 trackit:
    01173         /* find logo in tracked list */
    01174              for ( it=0 ; it < nlogo ; it++ )
    01175              {
    01176                 if ( region->key    != trak[it].memkey      )  continue;
    01177                 if ( hd.logo.type   != trak[it].logo.type   )  continue;
    01178                 if ( hd.logo.mod    != trak[it].logo.mod    )  continue;
    01179                 if ( hd.logo.instid != trak[it].logo.instid )  continue;
    01180                 /* activate sequence tracking if 1st msg */
    01181                 if ( !trak[it].active )
    01182                 {
    01183                     trak[it].seq    = hd.seq;
    01184                     trak[it].active = 1;
    01185                 }
    01186                 goto sequence;
    01187              }
    01188         /* new logo, track it if there's room */
    01189              if ( nlogo == NTRACK_GET )
    01190              {
    01191                 fprintf( stdout,
    01192                      "ERROR: tport_copyfrom; exceeded NTRACK_GET\n");
    01193                 if( status != GET_TOOBIG ) status = GET_NOTRACK; /*changed 960612:ldd*/
    01194                 goto wrapup;
    01195              }
    01196              it = nlogo;
    01197              trak[it].memkey = region->key;
    01198              trak[it].logo   = hd.logo;
    01199              trak[it].seq    = hd.seq;
    01200              trak[it].active = 1;      /*960618:ldd*/
    01201              nlogo++;
    01202
    01203 sequence:
    01204         /* check if sequence #'s match; update sequence # */
    01205              if ( status == GET_TOOBIG   )  goto wrapup; /*added 960612:ldd*/
    01206              if ( hd.seq != trak[it].seq )
    01207              {
    01208                 if (lapped)  status = GET_MISS_LAPPED;
    01209                 else         status = GET_MISS_SEQGAP;
    01210                 trak[it].seq = hd.seq;
    01211              }
    01212              trak[it].seq++;
    01213
    01214         /* Ok, we're finished grabbing this one */
    01215              goto wrapup;
    01216
    01217           } /* end if of logo & getlogo match */
    01218        }    /* end for over getlogo */
    01219    }        /* end while over ring */
    01220
    01221 /**** If you got here, there were no messages of requested logo(s) ****/
    01222
    01223    status = GET_NONE;
    01224
    01225 /**** update outpointer (->msg after retrieved one) for all requested logos ****/
    01226
    01227 wrapup:
    01228    for ( it=0 ; it < nlogo ; it++ )  /* for all message logos we're tracking */
    01229    {
    01230        if ( trak[it].memkey != region->key ) continue;
    01231        for ( j=0 ; j < nget ; j++ )  /* for all requested message logos */
    01232        {
    01233           if((getlogo[j].type   == trak[it].logo.type   || getlogo[j].type==WILD) &&
    01234              (getlogo[j].mod    == trak[it].logo.mod    || getlogo[j].mod==WILD)  &&
    01235              (getlogo[j].instid == trak[it].logo.instid || getlogo[j].instid==WILD) )
    01236           {
    01237              trak[it].keyout = keyget;
    01238           }
    01239        }
    01240     }
    01241
    01242    return( status );
    01243
    01244 }
    01245
    01246
    01247 /*********************** function tport_copyto ***********************/
    01248 /*           Puts a message into a shared memory region.             */
    01249 /*    Preserves the sequence number (passed as argument) as the      */
    01250 /*                transport layer sequence number                    */
    01251 /*********************************************************************/
    01252
    01253 int tport_copyto( SHM_INFO    *region,  /* info structure for memory region     */
    01254                   MSG_LOGO    *putlogo, /* type, module, instid of incoming msg */
    01255                   long         length,  /* size of incoming message             */
    01256                   char        *msg,     /* pointer to incoming message          */
    01257                   unsigned char seq )   /* preserve as sequence# in TPORT_HEAD  */
    01258 {
    01259    SHM_HEAD         *shm;              /* pointer to start of memory region   */
    01260    char             *ring;             /* pointer to ring part of memory      */
    01261    unsigned long     ir;               /* index into memory ring              */
    01262    long              nfill;            /* # bytes from ir to ring's last-byte */
    01263    long              nwrap;            /* # bytes to wrap to front of ring    */
    01264    TPORT_HEAD        hd;               /* transport layer header to put       */
    01265    char             *h;                /* pointer to transport layer header   */
    01266    TPORT_HEAD        old;              /* transport header of oldest msg      */
    01267    char             *o;                /* pointer to oldest transport header  */
    01268    int j;
    01269    int retval = PUT_OK;                /* return value for this function      */
    01270
    01271 /**** First time around, initialize semaphore controls ****/
    01272
    01273    if (Copyto_Init)
    01274    {
    01275        Copyto_Init  = 0;
    01276    }
    01277
    01278 /**** Set up pointers for shared memory, etc. ****/
    01279
    01280    shm  = region->addr;
    01281    ring = (char *) shm + sizeof(SHM_HEAD);
    01282    h    = (char *) (&hd);
    01283    o    = (char *) (&old);
    01284
    01285 /**** First, see if the incoming message will fit in the memory region ****/
    01286
    01287    if ( length + sizeof(TPORT_HEAD) > shm->keymax )
    01288    {
    01289       fprintf( stdout,
    01290               "ERROR: tport_copyto; message too large (%ld) for Region %ld\n",
    01291                length, region->key);
    01292       return( PUT_TOOBIG );
    01293    }
    01294
    01295 /**** Change semaphore to let others know you're using memory ****/
    01296
    01297    WaitForSingleObject( region->hMutex, INFINITE );
    01298
    01299 /**** Store everything you need in the transport header ****/
    01300
    01301    hd.start = FIRST_BYTE;
    01302    hd.size  = length;
    01303    hd.logo  = *putlogo;
    01304    hd.seq   = seq;
    01305
    01306 /**** First see if keyin will wrap; if so, reset both keyin and keyold ****/
    01307
    01308    if ( shm->keyin + sizeof(TPORT_HEAD) + length  <  shm->keyold )
    01309    {
    01310        shm->keyin  = shm->keyin  % shm->keymax;
    01311        shm->keyold = shm->keyold % shm->keymax;
    01312        if ( shm->keyin <= shm->keyold ) shm->keyin += shm->keymax;
    01313      /*fprintf( stdout,
    01314                "NOTICE: tport_copyto; keyin wrapped & reset; Region %ld\n",
    01315                 region->key );*/
    01316    }
    01317
    01318 /**** Then see if there's enough room for new message in shared memory ****/
    01319 /****      If not, "delete" oldest messages until there's room         ****/
    01320
    01321    while( shm->keyin + sizeof(TPORT_HEAD) + length - shm->keyold > shm->keymax )
    01322    {
    01323       ir = shm->keyold % shm->keymax;
    01324       if ( ring[ir] != FIRST_BYTE )
    01325       {
    01326           fprintf( stdout,
    01327                   "ERROR: tport_copyto; keyold not at FIRST_BYTE, Region %ld\n",
    01328                    region->key );
    01329           retval = TPORT_FATAL;
    01330           goto release_semaphore;
    01331       }
    01332       for ( j=0 ; j < sizeof(TPORT_HEAD) ; j++ )
    01333       {
    01334          if ( ir >= shm->keymax )   ir -= shm->keymax;
    01335          o[j] = ring[ir++];
    01336       }
    01337       shm->keyold += sizeof(TPORT_HEAD) + old.size;
    01338    }
    01339
    01340 /**** Now copy transport header into shared memory by chunks... ****/
    01341
    01342    ir = shm->keyin % shm->keymax;
    01343    nwrap = ir + sizeof(TPORT_HEAD) - shm->keymax;
    01344    if ( nwrap <= 0 )
    01345    {
    01346          memcpy( (void *) &ring[ir], (void *) h, sizeof(TPORT_HEAD) );
    01347    }
    01348    else
    01349    {
    01350          nfill = sizeof(TPORT_HEAD) - nwrap;
    01351          memcpy( (void *) &ring[ir], (void *) &h[0],     nfill );
    01352          memcpy( (void *) &ring[0],  (void *) &h[nfill], nwrap );
    01353    }
    01354    ir += sizeof(TPORT_HEAD);
    01355    if ( ir >= shm->keymax )  ir -= shm->keymax;
    01356
    01357 /**** ...and copy message into shared memory by chunks ****/
    01358
    01359    nwrap = ir + length - shm->keymax;
    01360    if ( nwrap <= 0 )
    01361    {
    01362          memcpy( (void *) &ring[ir], (void *) msg, length );
    01363    }
    01364    else
    01365    {
    01366          nfill = length - nwrap;
    01367          memcpy( (void *) &ring[ir], (void *) &msg[0],     nfill );
    01368          memcpy( (void *) &ring[0],  (void *) &msg[nfill], nwrap );
    01369    }
    01370    shm->keyin += sizeof(TPORT_HEAD) + length;
    01371
    01372 /**** Finished with shared memory, let others know via semaphore ****/
    01373
    01374 release_semaphore:
    01375    ReleaseMutex(region->hMutex);
    01376
    01377    if( retval == TPORT_FATAL ) exit( 1 );
    01378    return( retval );
    01379 }
    01380
    01381
    01382 /************************* tport_buferror ***************************/
    01383 /*  Build an error message and put it in the public memory region   */
    01384 /********************************************************************/
    01385 void tport_buferror( short  ierr,       /* 2-byte error word       */
    01386                      char  *note  )     /* string describing error */
    01387 {
    01388         MSG_LOGO    logo;
    01389         char        msg[256];
    01390         long        size;
    01391         time_t      t;
    01392
    01393         logo.instid = MyInstid;
    01394         logo.mod    = MyModuleId;
    01395         logo.type   = TypeError;
    01396
    01397         time( &t );
    01398         sprintf( msg, "%ld %hd %s\n", t, ierr, note );
    01399         size = strlen( msg );   /* don't include the null byte in the message */
    01400
    01401         if ( tport_putmsg( (SHM_INFO *) PubRegion, &logo, size, msg ) != PUT_OK )
    01402         {
    01403             printf("tport_bufthr:  Error sending error:%hd for module:%d.\n",
    01404                     ierr, MyModuleId );
    01405         }
    01406         return;
    01407 }
    01408
    01409
    01410 /************************ function tport_syserr **********************/
    01411 /*                 Print a system error and terminate.               */
    01412 /*********************************************************************/
    01413
    01414 void tport_syserr( char *msg,   /* message to print (which routine had an error) */
    01415                    long  key )  /* identifies which memory region had the error  */
    01416 {
    01417    extern int   sys_nerr;
    01418    extern char *sys_errlist[];
    01419
    01420    long err = GetLastError();   /* Override with per thread err */
    01421
    01422    fprintf( stdout, "ERROR: %s (%d", msg, err );
    01423    fprintf( stdout, "; %s) Region: %ld\n", strerror(err), key);
    01424
    01425 /*   if ( err > 0 && err < sys_nerr )
    01426       fprintf( stdout,"; %s) Region: %ld\n", sys_errlist[err], key );
    01427    else
    01428       fprintf( stdout, ") Region: %ld\n", key ); */
    01429
    01430    exit( 1 );
    01431 }
    01432