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ven53.c

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/*!
  @file           ven53.c
  @author         JoergM
  @brief          Kernel RunTime: Communication Functions for Kernel
  @see            

\if EMIT_LICENCE

    ========== licence begin  GPL
    Copyright (c) 2001-2005 SAP AG

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either version 2
    of the License, or (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
    ========== licence end



\endif
*/

#define MOD__ "ven53c :"

#include "RunTime/System/RTESys_MemoryBarrier.h"

#include "gen00.h"
#include "heo00.h"
#include "hen53.h"
#include "geo50_0.h"
#include "gen500.h"
#include "vsp001c.h"
#include "gen003.h"
#include "geo67.h"
#include "RunTime/System/RTESys_MicroTime.h"
#include "geo002.h"
#include "gen45.h"
#include "gen73.h"

/* imported functions */

#include "gen41.h"
#include "gen42.h"
#include "gen71.h"

extern  void              sql32_lock_comseg (connection_info *cip, char *msg);
extern  void              sql32_unlock_comseg (connection_info *cip);
#ifdef  DEBUG_RTE
extern  void              sql46_dump_packet (rte_header * header );
#endif

static void               HandlePing( tsp00_TaskId          pid );
static void               ReleaseConnection ( struct TASK_TYPE        *tcb,
                                              tsp01_CommErr            commState, 
                                              int                      waitflag );


extern  tsp00_DbNamec                   en81_dbname; 

/*
 * ===========================================================================
 */

#undef MF__
#define MF__ MOD__"vcmd_wait_time"
externC     tsp00_Int4  vcmd_wait_time ( tsp00_TaskId       pid )
{
  struct TASK_TYPE *tcb = KGS -> pFirstTaskCtrl + ( pid - 1 ) ;

  time_t WaitTime = tcb->state == TSK_VRECEIVE ? 
                    KGS->current_time - tcb->CmdWaitTime : 0 ;
  return ( (tsp00_Int4 )WaitTime ) ;
}

/*
 * =====================================================================
 */

#undef MF__
#define MF__ MOD__"vconnect"
externC     void  vconnect2 ( 
tsp00_TaskId       pid ,
tsp00_Int4        *max_data_len ,
tsp00_Bool        *webuser ,
tsp01_CommErr     *returncode )
{
ten50_UKT_Control *this_ukt = THIS_UKT_CTRL;
    struct TASK_TYPE        *tcb = this_ukt->curr_task;
    connection_info             *cip ;
    struct DOUBLY_LINKED      *lquu;

    DBGIN_T( tcb->index );

    tcb->state = TSK_CONNECTWAIT ;
    cip = tcb->connection;
      DBG1(( MF__,"state %d\n", cip->ci_state ));

    lquu = e73_dl_dequ ( &tcb->dlq_connreq );

    /* connect request already received? */
    if ( lquu == NULL )
    {
            tcb->task_timeout = MAXTIMEVALUE ;
        DBG1 (( MF__,"goto_disp  T%d \n", tcb->index ));
        GOTO_DISP (&this_ukt);
        DBG1 (( MF__,"from disp  T%d \n", tcb->index ));

        if ( this_ukt->curr_quu->req_type != REQ_CONNECT )
        {
            MSGALL (( ERR_ILLEGAL_REQUEST, "connect", this_ukt->curr_quu->req_type ));
            vabort ( WRITE_CORE );
        }

        lquu = this_ukt->curr_quu;
    }

    /* free the queue element which woke us */
    e73_dl_enqu ( & KGS->freelist , lquu );

    RTESys_ReadMemoryBarrier();

    if ( !cip->ci_alter_server_sem )
    {   /* set move lock... */
        en71LongTermMoveLock( tcb, CLIENT_NOT_TASK_MOVE_ENABLED, true );
    }

    /* Set move lock, because the task should not move to another UKT 
    until we have received a command from client */ 
    en71LongTermMoveLock( tcb, WAITING_FOR_NEW_COMMAND, true );

    e75_connect_request ( tcb, cip );

    *webuser = (cip->ci_service == 4);
    *max_data_len = cip->ci_max_data_size ;
    *returncode = ( cip->ci_state == CON_ESTABLISHED ? commErrOk_esp01 : commErrNotOk_esp01 );

    if ( *returncode == commErrOk_esp01 )
    {
        if ( cip->ci_service == srvPing_esp01 )
        {
            HandlePing ( pid );

            /* --- release connection */
            *returncode = commErrNotOk_esp01;
            ReleaseConnection ( tcb, commErrOk_esp01, TRUE );
        }
        else
        {
            if ( tcb->type == TT_EV )
            {
                if ( !eo67ConnectEventTask(pid) )
                {
                    vabort(1);
                }
            }
            else
            {
                /* PTS 1004575 */
                eo67InsertSessionEvent(true, pid);
            }
        }
    }
    else
    {
        /* remove long term move lock */
        en71LongTermMoveLock( tcb, CLIENT_NOT_TASK_MOVE_ENABLED, false );
        en71LongTermMoveLock( tcb, WAITING_FOR_NEW_COMMAND, false );
    }

    DBG1 (( MF__,"leaving state %d datasize %d\n",
                   cip->ci_state , *max_data_len ));

    DBGOUT_T( tcb->index );
}

/*
 * =====================================================================
 */
externC  void    vconnect ( 
tsp00_TaskId              pid ,
tsp00_Int4                *max_data_len ,
tsp01_CommErr         *returncode )
{
    tsp00_Bool webuser;

    vconnect2 (pid, max_data_len, &webuser, returncode);
}

/*
 * =====================================================================
 */

#undef MF__
#define MF__ MOD__"vrelease"
externC     void  vrelease ( tsp00_TaskId pid )
{
    struct TASK_TYPE   *tcb = KGS -> pFirstTaskCtrl + ( pid - 1 ) ;
    connection_info           *cip ;

    DBGIN_T(tcb->index);

    cip = tcb->connection;

    ReleaseConnection( tcb, (cip->ci_state == CON_REPLIED ? commErrOk_esp01 : commErrReleased_esp01), TRUE ); /* wait */

    DBGOUT_T( tcb->index );
}

/*
 * =====================================================================
 */

#undef MF__
#define MF__ MOD__"vreceive"
externC     void  vreceive ( 
tsp00_TaskId            pid ,
tsp00_Int4        timeout ,
void              **rcv_packet_ptr ,
tsp00_Int4        *rcv_length ,
void              **reply_packet_ptr ,
tsp00_Int4        *reply_size ,
tsp01_CommErr           *returncode )
{
ten50_UKT_Control *this_ukt = THIS_UKT_CTRL;
    struct TASK_TYPE   *tcb = this_ukt->curr_task;
    int                       idx ;
    int                       state ;
    int                       length ;
    comseg_header       *comseg ;
    rte_header                *header ;
    connection_info           *cip ;

    DBG1 (( MF__,"T%d timeout %d \n", tcb->index , timeout ));
    tcb->CmdWaitTime = KGS->current_time;
    tcb->state = TSK_VRECEIVE ;
    cip = tcb->connection;

    *returncode       = commErrNotOk_esp01 ;
    *rcv_packet_ptr   = 0 ;
    *rcv_length       = 0 ;
    *reply_packet_ptr = 0 ;
    *reply_size       = 0 ;

    state = cip->ci_state ;
    if ( (state != CON_ESTABLISHED) && (state != CON_REPLIED) )
    {
            MSGD (( WRN_VRECV_IN_WRONG_STATE, state , tcb->index ));
            tcb->state = TSK_RUNNING ;
            return ;
    }

    cip->ci_state = CON_ESTABLISHED ; /* avoid returning state CON_REPLIED */
    if ( state == CON_ABORTED )
    {
            MSGD (( WRN_VRECV_APPLICATION_DEAD, tcb->index ));
        ReleaseConnection( tcb, commErrCrash_esp01 , FALSE ); /* no wait */
        tcb->state = TSK_RUNNING ;
        return ;
    }

    state = KGS -> state ;
    if ( (state != SERVER_WARM)         &&
           (state != SERVER_COLD)         &&
           (state != SERVER_STANDBY_EO00) &&
           (state != SERVER_STARTING)     &&
         (state != SERVER_SHUTDOWN || tcb->type != TT_EV) )
    {
            MSGD (( WRN_VRECV_BAD_SERVERSTATE, KGS -> state ));

            if ( state == SERVER_SHUTDOWN )
                  *returncode = commErrShutdown_esp01 ;
            else
                  *returncode = commErrCrash_esp01 ;
            tcb->state = TSK_RUNNING ;
            return ;
    }

    if ( timeout > 0 )
      {
            tcb->task_timeout = timeout + KGS->current_time;
      }
    else
    {
            /*
             *  Timeout == 0 means sleep indefinitely.
             */
            tcb->task_timeout = MAXTIMEVALUE ;
    }
    /*
     *  insert task into COM queue, where it waits for a packet
     */
    e71_com ( tcb );

    DBG1 (( MF__,"goto_disp  T%d \n", tcb->index ));
    GOTO_DISP (&this_ukt);
    DBG1 (( MF__,"from disp  T%d \n", tcb->index ));
    /*
     *************************************************
     *  The dispatcher thinks a request has arrived
     *************************************************
     */
    RTESys_ReadMemoryBarrier();

    if ( ( KGS -> state == SERVER_SHUTDOWN ) && ( tcb->type != TT_EV ) )
    {
        DBG1 (( MF__,"database shutdown, T%d", tcb->index ));
        ReleaseConnection( tcb, commErrShutdown_esp01 , TRUE ); /* wait */
        *returncode      = commErrShutdown_esp01 ;
        tcb->state = TSK_RUNNING ;
        return ;
    }

    if ( cip->ci_state == CON_TIMEDOUT )
    {
        DBG1 (( MF__,"connection timeout, T%d" , tcb->index ));
        ReleaseConnection( tcb, commErrTimeout_esp01 , FALSE ); /* no wait */
        *returncode      = commErrTimeout_esp01 ;
        tcb->state = TSK_RUNNING ;
        return ;
    }

    if ( cip->ci_state == CON_ABORTED )
    {
            MSGD (( WRN_VRECV_APPLICATION_DEAD, tcb->index ));
        ReleaseConnection( tcb, commErrCrash_esp01 , FALSE ); /* no wait */
        tcb->state = TSK_RUNNING ;
        return ;
    }

    comseg = cip->ci_comseg ;
    if ( ! comseg )
    {
            MSGD (( INFO_CONN_BROKEN_NO_COMSEG, tcb->index )) ;
        ReleaseConnection( tcb, commErrCrash_esp01 , FALSE ); /* no wait */
        tcb->state = TSK_RUNNING ;
        return ;
    }

    *returncode = comseg->cs_client_state ;
    DBG1 (( MF__,"connection state %d \n", *returncode ));
    if ( *returncode != commErrOk_esp01 )
    {
            MSGD (( INFO_CONN_BROKEN_BY_APPL_ST, *returncode , 
                  tcb->index ));
        ReleaseConnection( tcb, commErrCrash_esp01 , FALSE ); /* no wait */
        tcb->state = TSK_RUNNING ;
        return ;
    }

    idx = comseg->cs_current_packet ;
    if ( (idx < 0) || (idx > cip->ci_packet_cnt) )
    {
        MSGD (( IERR_VREC_WRONG_PACKET_REQ, idx , 
                  tcb->index ));
        ReleaseConnection( tcb, commErrNotOk_esp01 , TRUE ); /* wait */
        tcb->state = TSK_RUNNING ;
            *returncode = commErrNotOk_esp01 ;
        return ;
    }
    header = cip->ci_packet[idx];
    cip->ci_request = header ;

    length = header->rh_max_send_len - RTE_HEADER_SIZE ;
    if ( (length < 0) || (length > cip->ci_max_request_size) )
    {
        MSGD (( IERR_VREC_ILL_LENGTH ,
               length , cip->ci_max_request_size, tcb->index ));
        ReleaseConnection( tcb, commErrNotOk_esp01 , TRUE ); /* wait */
        tcb->state = TSK_RUNNING ;
            *returncode = commErrNotOk_esp01 ;
        return ;
    }
    cip->BytesReceived += header->rh_max_send_len;
    cip->ci_state       = CON_RECEIVED ;
    *rcv_packet_ptr     = (void*) (header + 1);
    *rcv_length         = length ;
    idx = ( (length & 7) != 0 ?  (8 - (length & 7)) : 0 );

    cip->ci_request_lgt = length + idx ;
    cip->ci_reply       = (rte_header*) ((char*) (header + 1) + length + idx);
    cip->ci_reply_size  = cip->ci_max_data_size - length - idx ;
    *reply_packet_ptr   = (void*) (cip->ci_reply + 1);
    *reply_size         = cip->ci_reply_size ;
    DBG1 (( MF__,"req 0x%08lx rpl 0x%08lx lgt %d \n",
            (long) cip->ci_request , (long) cip->ci_reply , length ));

#ifdef  DEBUG_RTE
    sql46_dump_packet ( header );
#endif
#ifdef FROMUSER
    DBG1 (( MF__,"dumping packet to DUMPFILE \n" ));
    sql46_dump ( "\nFROMUSER------>", 16 );
    sql46_dump ( (char*) (header + 1) , length );
    sql46_dump ( "<---------------", 18 - (length + 13)%16 );
    sql46_dump ( "--FROMUSER\n", 11 );
#endif

    DBG1 (( MF__,"length   %d \n", length ));
    DBG1 (( MF__,"return   %d \n", *returncode ));
    DBG1 (( MF__,"leaving, T%d \n", tcb->index ));

    /*
      We have entered the dispatcher before, so 'tcb->TimeCollectionEnabled' is setup if time measurtement is enabled.
      We later use 'vreceiveORvreplyLeaveTime != 0' as condition to allow collection of time in vreply.

      Time measurement values collect here at end of vreceive (tcb->TaskStateStat):
          vreceiveORvreplyLeaveTime                Timestamp of last 'end' of vreply routine, updated with actualMicroSeconds
          runqueueEnqueueTime                     Time when task was moved from COM queue to RUN queue
          RplRcvStat.ulAbsMicroSeconds            Sum of all time intervals between vreply and following 'end' of vreceive
          RplRcvStat.ulRelMicroSeconds            Sum of all time intervals between vreply and following entering RUN queue
          RplRcvStat.ulCount                      Number of intervals added
    */
    if ( tcb->TimeCollectionEnabled )
    {
        SAPDB_UInt8 actualMicroSeconds = RTESys_MicroSecTimer();
        
        if ( tcb->TaskStateStat.vreceiveORvreplyLeaveTime )
        {
            tcb->TaskStateStat.RplRcvStat.ulCount++;
            
            tcb->TaskStateStat.RplRcvStat.ulAbsMicroSeconds += 
                (actualMicroSeconds - tcb->TaskStateStat.vreceiveORvreplyLeaveTime);
            
            tcb->TaskStateStat.RplRcvStat.ulRelMicroSeconds += 
                (tcb->TaskStateStat.runqueueEnqueueTime - tcb->TaskStateStat.vreceiveORvreplyLeaveTime);
        }
        
        tcb->TaskStateStat.vreceiveORvreplyLeaveTime  = actualMicroSeconds;
    }
    else
    {
        /* Reset start timestamp, so vreply wont produce illegal values */
        tcb->TaskStateStat.vreceiveORvreplyLeaveTime  = 0;
    }



    tcb->state = TSK_RUNNING ;
}

/*
 * =====================================================================
 */

#undef MF__
#define MF__ MOD__"vreply"
externC     void  vreply ( 
tsp00_TaskId            pid ,
void              *reply_packet_ptr ,
tsp00_Int4        reply_length ,
tsp01_CommErr           *returncode )
{
    struct TASK_TYPE   *tcb = KGS -> pFirstTaskCtrl + ( pid - 1 ) ;
    int                       state ;
    rte_header                *header ;
    comseg_header       *comseg ;
    connection_info           *cip ;



    DBG1 (( MF__,"entered T%d pktptr 0x%08lx lgt %d \n",
          tcb->index , (long) reply_packet_ptr , reply_length ));

    tcb->state = TSK_VREPLY ;
    *returncode = commErrNotOk_esp01 ;

    cip = tcb->connection;
    state = cip->ci_state ;
    cip->ci_state = CON_ESTABLISHED ; /* avoid returning state CON_REPLIED */

    if ( reply_packet_ptr != (void*) (cip->ci_reply + 1) )
    {
            MSGD (( IERR_VREPLY_WRONG_PACK_ADDR ,
             (long) reply_packet_ptr , cip->ci_reply, tcb->index ));
        vabort(1);
    }
    if (    (reply_length < 0) || (reply_length > cip->ci_reply_size) )
    {
            MSGD (( WRN_REPLY_PACK_SIZE,
           cip->ci_packet_size , cip->ci_max_data_size , cip->ci_request_lgt ));
            MSGD (( IERR_VREPLY_ILL_PACK_LEN,
             reply_length , cip->ci_reply_size , tcb->index ));
        vabort(1);
    }

    if ( state == CON_ABORTED )
    {
            DBG1 (( MF__,"application dead for T%d \n", tcb->index ));
        ReleaseConnection( tcb, commErrCrash_esp01 , FALSE ); /* no wait */
        tcb->state = TSK_RUNNING ;
        return ;
    }
    if ( state != CON_RECEIVED )
    {
        MSGD (( WRN_VREPLY_IN_WRONG_STATE, cip->ci_state , 
                  tcb->index ));
        tcb->state = TSK_RUNNING ;
            return ;
    }

    comseg = cip->ci_comseg ;
    if ( comseg )
            sql32_lock_comseg ( cip , "vreply: 0x%08lx \n" );

    if (    ! comseg
         || (comseg->cs_client_pid   != cip->ci_peer_pid)
         || (comseg->cs_client_ref   != cip->ci_peer_ref)
         || (comseg->cs_client_semid != cip->ci_peer_semid)
           || (comseg->cs_client_state != commErrOk_esp01)
       )
    {
        MSGD (( INFO_CONN_BROKEN_BAD_COMSEG, tcb->index,
                  (long) comseg ));
            MSGD (( INFO_CONN_BROKEN_CI_INFO,
                  (long) cip->ci_peer_pid , cip->ci_peer_ref , cip->ci_peer_semid ));
        if ( comseg )
              MSGD (( INFO_CONN_BROKEN_CS_INFO,
                  (long) comseg->cs_client_pid , comseg->cs_client_ref ,
                  comseg->cs_client_semid , comseg->cs_client_state ));
            sql32_unlock_comseg ( cip );
            tcb->state = TSK_RUNNING ;
        DBGOUT_T( tcb->index );
        return ;
    }

    /*
     *  Setup the rte header.
     */
    header = cip->ci_reply ;
    header->rh_act_send_len     = reply_length + RTE_HEADER_SIZE ;
    header->rh_max_send_len     = reply_length + RTE_HEADER_SIZE ;
    header->rh_protocol_id      = RSQL_RTE_PROT_LOCAL_EO003 ;
    header->rh_mess_class       = RSQL_USER_DATA_REPLY_EO003 ;
    header->rh_rte_flags        = RSQL_NORMAL_EO003 ;
    header->rh_residual_packets = 0 ;
    header->rh_sender_ref       = comseg->cs_server_ref ;
    header->rh_receiver_ref     = comseg->cs_client_ref ;
    header->rh_rte_return_code  = 0 ;
    header->rh_new_swap_type    = sql42_new_swap_type();
    header->rh_filler1          = 0 ;
    DBG1 (( MF__,"req 0x%08lx rpl 0x%08lx lgt %d \n",
          (long) cip->ci_request , (long) cip->ci_reply ,
          reply_length + RTE_HEADER_SIZE ));

#ifdef  DEBUG_RTE
    sql46_dump_packet ( header );
#endif
#ifdef  TRACE_RETCOD
    DBG1 (( MF__,"sp1r_returncode %d \n",
         ((tsp1_packet*)(header+1))->integer.C_2.sp1_segm.integer.C_4.sp1r_returncode ));
#endif
#ifdef TOUSER
    DBG1 (( MF__,"dumping packet to DUMPFILE \n" ));
    sql46_dump ( "\nTOUSER-------->", 16 );
    sql46_dump ( (char*) (header + 1) , (int) reply_length );
    sql46_dump ( "<---------------", 18 - ((int)reply_length + 13)%16 );
    sql46_dump ( "----TOUSER\n", 11 );
#endif

    comseg->cs_server_semid = tcb->ukt->semid;  /* we are waiting on this UKT sem */
    en71LongTermMoveLock( tcb, WAITING_FOR_NEW_COMMAND, true );

    comseg->cs_server_flag = 1 ;

    DBG1 (( MF__,"comseg 0x%08lx cli,srv %d,%d \n", (long) comseg ,
          comseg->cs_client_flag , comseg->cs_server_flag ));

    sql32_unlock_comseg ( cip );

    cip->BytesSend += header->rh_max_send_len;

    *returncode = (tsp01_CommErr) e75_wake_peer ( cip );
    if ( *returncode != SP1CE_OK )
    {
        int logLength ;
        char logbuf[512];
      struct tm timeBuffer;
          struct tm *pTime = localtime_r( &cip->ci_connect_time, &timeBuffer );
        if ( pTime )
        {
            (void) sp77sprintf ( logbuf , sizeof(logbuf), "Client died to early? (vreply) Connected to T%d since %02d:%02d:%02d",
                tcb->index, pTime->tm_hour, pTime->tm_min, pTime->tm_sec );
        }
        else
        {
            (void) sp77sprintf ( logbuf , sizeof(logbuf), "Client died to early? Connected to T%d since ?%ld?",
                tcb->index, (long)cip->ci_connect_time );
        }
        logLength = strlen ( logbuf );
        if ( cip->ci_peer_node[0] )
                (void) sp77sprintf ( logbuf + logLength , sizeof(logbuf) - logLength, " remote %s" , cip->ci_peer_node );
        else
                (void) sp77sprintf ( logbuf + logLength , sizeof(logbuf) - logLength, " local" );
        logLength = strlen ( logbuf );
        if ( cip->ci_remote_pid[0] )
                (void) sp77sprintf ( logbuf + logLength , sizeof(logbuf) - logLength, " remote_pid %s" , cip->ci_remote_pid );
        logLength = strlen ( logbuf );
            (void) sp77sprintf ( logbuf + logLength , sizeof(logbuf) - logLength, " peer_pid %ld" , (long) cip->ci_peer_pid );
      MSGD (( ERR_DISTRIB_WAKE_SEMOP, logbuf ));
    }

    if ( KGS->fTimeMeasure )
    {
        SAPDB_UInt8 actualMicroSeconds = RTESys_MicroSecTimer();

        if ( tcb->TaskStateStat.vreceiveORvreplyLeaveTime )
        {
            tcb->TaskStateStat.RcvRplStat.ulCount++;
            tcb->TaskStateStat.RcvRplStat.ulAbsMicroSeconds += 
               ( actualMicroSeconds - tcb->TaskStateStat.vreceiveORvreplyLeaveTime );
            if ( (actualMicroSeconds - tcb->TaskStateStat.vreceiveORvreplyLeaveTime) > EO52_TOO_LONG_LIMIT_IN_MICROSECONDS )
            {
                tcb->TaskStateStat.ulRcvRplToLong ++;
            }
        }
        tcb->TaskStateStat.vreceiveORvreplyLeaveTime = actualMicroSeconds;
    }
    else
    {
        /* Reset start timestamp, so vreply wont produce illegal values */
        tcb->TaskStateStat.vreceiveORvreplyLeaveTime  = 0;
    }

    cip->ci_state = CON_REPLIED ;

    tcb->state = TSK_RUNNING ;
    DBG1 (( MF__,"leaving %d, T%d \n", *returncode , tcb->index ));
}

/*
 * ==================================================================
 */
void  vgetapplpid( PROCESS_ID           tid ,
                     tsp00_NodeId         appl_node ,
                     tsp00_Int4          *appl_pid ,
                     BOOLEAN             *ok )
{
#undef  MF__
#define MF__ MOD__"vgetapplpid"

    if ( ( tid > 0 ) && ( ((SAPDB_Int4)tid) <= KGS->ulNumOfTasks ) )
    {
        struct TASK_TYPE *tcb = KGS->pFirstTaskCtrl + ( tid - 1 ) ;

        if ( 0 != tcb->connection )
        {
            char peer_pid_buffer[32];

            *appl_pid = atoi ( sql45_peer_pid ( tcb, peer_pid_buffer ) ) ;

            eo46CtoP ( appl_node
                     , sql45_has_remote_pid ( tcb ) ? sql45_peer_node ( tcb ) : (char *)(KGS->servernode)
                     , sizeof(tsp00_NodeId) );
            *ok = true;
        }
        else
        {
            *appl_pid = -1;
            eo46CtoP ( appl_node
                     , (char *)(KGS->servernode)
                     , sizeof(tsp00_NodeId) );
            *ok = false;
        }
    }
    else
    {
#ifdef SDB_DEV_ONLY_CHECK
        MSGD (( ERR_KERN_PARAM_PID_OUT_OF_RANGE, tid ));
        vabort(1);
#else
        *appl_pid = -1;
        eo46CtoP ( appl_node
                 , (char *)""
                 , sizeof(tsp00_NodeId) );
        *ok = false;
#endif
    }
}

/*
 * =====================================================================
 */

externC      tsp00_Int4  vconnectedusertasks ()
{
    return KGS->connectedUserTasks;
}

/*
 * =====================================================================
 */

static void HandlePing( tsp00_TaskId          pid )
{
    tsp01_CommErr         commState = commErrOk_esp01;
    void*                 rcvPacket;
    tsp00_Int4            rcvPacketLen;
    void*                     replyPacket;
    tsp00_Int4                replyPacketLen;

    do
    {
        vreceive ( pid, 240, &rcvPacket, &rcvPacketLen, &replyPacket, &replyPacketLen, &commState );

        if  ( commState == commErrOk_esp01 )
        {
           if ( eo420ExtractPingPacket( (char*)rcvPacket, rcvPacketLen, 0, 0, 0 ) )
           {
                replyPacketLen =  eo420FillPingPacket ( (char*) replyPacket,
                                                         replyPacketLen,
                                                         1,   /* hops greater than 0 means that the final destination was reached */
                                                         en81_dbname,
                                                         XPARAM(szKernelVersion), 0 );

                if ( replyPacketLen )
                    vreply( pid, replyPacket, replyPacketLen, &commState );
                else
                    commState = commErrNotOk_esp01;
            }
            else
                commState = commErrNotOk_esp01;
        }
        else
            commState = commErrNotOk_esp01;
    } 
    while( commState == commErrOk_esp01  );
}

/*
 * =====================================================================
 */

static void ReleaseConnection ( struct TASK_TYPE        *tcb,
                                tsp01_CommErr            commState, 
                                int                      waitflag )
{
    e75_release_connection ( commState, waitflag );

    /* remove long term move lock */
    en71LongTermMoveLock( tcb, CLIENT_NOT_TASK_MOVE_ENABLED, false );
    en71LongTermMoveLock( tcb, WAITING_FOR_NEW_COMMAND, false );
}

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