/* PROGRAM: cxProcessDeleteChain - process all the
* delete lock chain blocks ie, till as many
* blocks as are on the chain are processed
*
* RETURNS: DSMVOID
*
*/
DSMVOID
cxProcessDeleteChain(
dsmContext_t *pcontext,
dsmObject_t tableNum,
dsmArea_t area)
{
int chainLength;
bkAreaDesc_t *pbkAreaDesc;
pbkAreaDesc = BK_GET_AREA_DESC(pcontext->pdbcontext, area);
chainLength = pbkAreaDesc->bkNumBlocksOnChain[LOCKCHN];
while( chainLength-- )
{
rlTXElock(pcontext,RL_TXE_UPDATE,RL_MISC_OP);
cxRemoveFromDeleteChain(pcontext, tableNum, area);
rlTXEunlock(pcontext);
}
} /* end cxProcessDeleteChain */
/* PROGRAM: dsmDatabaseProcessEvents - perform xxx processing
*
* NOTE: Quiet points and tmdelayed commit are supported here
*
* RETURNS: DSM_S_SUCCESS
* DSM_S_INVALID_USER
* DSM_S_SHUT_DOWN on EXBAD or EXGOOD
*/
dsmStatus_t
dsmDatabaseProcessEvents(
dsmContext_t *pcontext)
{
dbcontext_t *pdbcontext = pcontext->pdbcontext;
dbshm_t *pdbshm = pdbcontext->pdbpub;
usrctl_t *pusr = pcontext->pusrctl;
mstrblk_t *pmstr;
dsmStatus_t returnCode;
#if OPSYS==WIN32API
if (fWin95)
return -1;
#endif
pdbcontext->inservice++; /* "post-pone" signal handling while in DSM API */
SETJMP_ERROREXIT(pcontext, returnCode) /* Ensure error exit address set */
if ((returnCode = dsmThreadSafeEntry(pcontext)) != DSM_S_SUCCESS)
{
returnCode = dsmEntryProcessError(pcontext, returnCode,
(TEXT *)"dsmDatabaseProcessEvents");
goto done;
}
/* Check for quiet point command requests */
if (pdbshm->quietpoint == QUIET_POINT_REQUEST)
{
/* Shut off update activity for the quiet point */
rlTXElock(pcontext,RL_TXE_EXCL,RL_MISC_OP);
MT_LOCK_MTX();
pmstr = pdbcontext->pmstrblk;
/* Switch after imaging extent if there are ai extents */
if( rlaiqon(pcontext) && pmstr->mb_aibusy_extent > 0 )
{
MT_LOCK_AIB();
if (rlaiswitch(pcontext, (int)RLAI_NEW, 1) )
{
MT_UNLK_AIB();
/* Unable to switch to new ai extent */
MSGN_CALLBACK(pcontext, drMSG205);
if ( MTHOLDING(MTL_MTX) )
MT_UNLK_MTX();
if ( pusr->uc_txelk )
rlTXEunlock(pcontext);
goto done;
}
MT_UNLK_AIB();
}
/* Flush the buffer pool and bi buffers */
rlbiflsh(pcontext,RL_FLUSH_ALL_BI_BUFFERS);
/* At this point, the quiet point is in place */
MSGN_CALLBACK(pcontext, drMSG402);
pdbshm->quietpoint = QUIET_POINT_ENABLED;
while(pdbshm->quietpoint == QUIET_POINT_ENABLED &&
!pdbshm->shutdn)
{
utsleep(1);
}
MT_UNLK_MTX();
rlTXEunlock(pcontext); /* Release transaction end lock */
/* At this point, normal operations can return */
MSGN_CALLBACK(pcontext, drMSG403);
pdbshm->quietpoint = QUIET_POINT_NORMAL;
}
/* Process delayed commit (-Mf) */
tmchkdelay(pcontext, 0);
/* Check if table locking can be shut off */
lkTableLockCheck(pcontext);
returnCode = DSM_S_SUCCESS;
done:
dsmThreadSafeExit(pcontext);
pdbcontext->inservice--; /* re-allow signal handling */
return returnCode;
} /* end dsmDatabaseProcessEvents */