/* 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 */
/* PROGRAM: dbQuietPoint - evaluate the quiet request and
* enable or disable the quiet point.
*
* RETURNS: 0 - success
* non-zero - failure
*/
int
dbQuietPoint(dsmContext_t *pcontext,
UCOUNT quietRequest,
ULONG quietArg)
{
int returnCode = 0; /* status of the quiet request */
dbcontext_t *pdbcontext = pcontext->pdbcontext;
dbshm_t *pdbshm = pdbcontext->pdbpub;
usrctl_t *pusrctl = pcontext->pusrctl;
RLCTL *prl = pdbcontext->prlctl;
LONG64 bithreshold = 0;
DOUBLE bitholdBytes = 0;
DOUBLE bitholdSize = 0;
TEXT sizeId;
DOUBLE fromBitholdBytes = 0;
DOUBLE fromBitholdSize = 0;
TEXT fromSizeId;
DOUBLE toBitholdBytes = 0;
DOUBLE toBitholdSize = 0;
TEXT toSizeId;
TEXT printBuffer[13];
TEXT fromPrintBuffer[13];
TEXT toPrintBuffer[13];
/* Before we attempt to enable or disable the quiescent point */
/* we need to check for the existence of the broker. */
if (!deadpid(pcontext, pdbshm->brokerpid))
{
if (quietRequest == QUIET_POINT_REQUEST)
{
if (!pdbshm->quietpoint == QUIET_POINT_NORMAL)
{
if ((pdbshm->quietpoint == QUIET_POINT_REQUEST) ||
(pdbshm->quietpoint == QUIET_POINT_ENABLED))
{
/* Quiet point has already been requested. */
MSGN_CALLBACK(pcontext, drMSG392);
returnCode = 4;
}
else
{
/* Protect against a second user trying to quiet */
/* Enabling the quiet point is in effect. */
MSGN_CALLBACK(pcontext, drMSG393);
returnCode = 6;
}
}
else
/* Database is in the Normal Processing State */
{
/* Check if after imaging is enabled without */
/* the use of after image extents. */
if ( rlaiqon(pcontext) == 1 &&
pdbcontext->pmstrblk->mb_aibusy_extent == 0 )
{
/* Cannot enable with single ai file */
MSGN_CALLBACK(pcontext, drMSG394);
returnCode = 2;
}
else
{
/* Reset the shared memory variable to request */
/* the enabling of the quiet point by the broker. */
pdbshm->quietpoint = QUIET_POINT_REQUEST;
/* Loop until the quietpoint state changes to */
/* QUIET_POINT_ENABLED */
for (;;)
{
/* Test for brokers existence and whether */
/* shutdown has already occurred. */
if (deadpid(pcontext, pdbshm->brokerpid))
{
MSGN_CALLBACK(pcontext, drMSG395);
returnCode = 16;
break;
}
/* Check to see if a shutdown was received. */
if (pusrctl->usrtodie)
{
MSGN_CALLBACK(pcontext, drMSG396);
returnCode = 16;
break;
}
if (pdbshm->quietpoint == QUIET_POINT_ENABLED)
{
pdbcontext->usertype |= DBSHUT;
returnCode = 0;
break;
}
utsleep(1);
}
}
}
}
/* Disable the Ouiet Point */
else if (quietRequest == QUIET_POINT_DISABLE)
{
/* Database is in the Normal Processing State */
if (pdbshm->quietpoint == QUIET_POINT_ENABLED)
{
/* Reset the shared memory variable to request */
/* the enabling of the quiet point by the broker. */
pdbshm->quietpoint = QUIET_POINT_DISABLE;
/* Loop until the quietpoint state changes to */
/* QUIET_POINT_ENABLED */
for (;;)
{
/* Test for brokers existence */
if (deadpid(pcontext, pdbshm->brokerpid))
{
MSGN_CALLBACK(pcontext, drMSG397);
pdbcontext->usertype |= DBSHUT;
returnCode = 16;
break;
}
/* Check to see if a shutdown was received. */
if (pusrctl->usrtodie)
{
MSGN_CALLBACK(pcontext, drMSG398);
pdbcontext->usertype |= DBSHUT;
returnCode = 16;
break;
}
if (pdbshm->quietpoint == QUIET_POINT_NORMAL)
{
pdbcontext->usertype |= DBSHUT;
returnCode = 0;
break;
}
utsleep(1);
}
}
else if (pdbshm->quietpoint != QUIET_POINT_ENABLED)
{
/* Quiet point does not need to be disabled. */
MSGN_CALLBACK(pcontext, drMSG399);
pdbcontext->usertype |= DBSHUT;
returnCode = 3;
}
}
else if (quietRequest == QUIET_POINT_BITHRESHOLD)
{
/* Round down bi threshold by a cluster if it is set */
bithreshold =
( (((LONG64)quietArg * 1048576) / prl->rlbiblksize)
- (prl->rlclbytes / prl->rlbiblksize) );
if (bithreshold > 0 && bithreshold > prl->rlsize)
{
/* Validate the bi threshold value */
if (pdbshm->bithold == bithreshold)
{
/* bithold size same, request to change rejected */
bitholdBytes =
(DOUBLE)bithreshold * prl->rlbiblksize;
utConvertBytes(bitholdBytes,
&bitholdSize, &sizeId);
sprintf((char *)printBuffer, "%-5.1f %cBytes",
bitholdSize, sizeId);
MSGN_CALLBACK(pcontext, drMSG687, printBuffer);
MSGN_CALLBACK(pcontext, drMSG451);
returnCode = 3;
}
else if (pdbshm->bithold == 0
|| pdbshm->bithold > (ULONG)prl->rlsize)
{
if (pdbshm->quietpoint != QUIET_POINT_ENABLED)
{
/* Quiet point not enabled and stall did not occur.
Request to change bi threshold rejected */
MSGN_CALLBACK(pcontext, drMSG452);
MSGN_CALLBACK(pcontext, drMSG451);
returnCode = 3;
}
else
{
/* Make sure new bi threshold is larger than
bi file size */
if (bithreshold >= prl->rlsize)
{
/* bi threshold changed from value to value */
fromBitholdBytes =
(DOUBLE)pdbshm->bithold * prl->rlbiblksize;
utConvertBytes(fromBitholdBytes,
&fromBitholdSize, &fromSizeId);
sprintf((char *)fromPrintBuffer, "%-5.1f %cBytes",
fromBitholdSize, fromSizeId);
toBitholdBytes =
(DOUBLE)bithreshold * prl->rlbiblksize;
utConvertBytes(toBitholdBytes,
&toBitholdSize, &toSizeId);
sprintf((char *)toPrintBuffer, "%-5.1f %cBytes",
toBitholdSize, toSizeId);
MSGN_CALLBACK(pcontext, drMSG686,
fromPrintBuffer, toPrintBuffer);
pdbshm->bithold = bithreshold;
returnCode = 0;
}
else
{
/* Invalid value provided, request to change
bi threshold rejected */
MSGN_CALLBACK(pcontext, drMSG454);
MSGN_CALLBACK(pcontext, drMSG451);
returnCode = 3;
}
}
}
else if ((pdbshm->bithold) <= (ULONG)prl->rlsize)
{
/* bi threshold reached */
/* bi threshold changed from value to value */
fromBitholdBytes =
(DOUBLE)pdbshm->bithold * prl->rlbiblksize;
utConvertBytes(fromBitholdBytes,
&fromBitholdSize, &fromSizeId);
sprintf((char *)fromPrintBuffer, "%-5.1f %cBytes",
fromBitholdSize, fromSizeId);
toBitholdBytes =
(DOUBLE)bithreshold * prl->rlbiblksize;
utConvertBytes(toBitholdBytes,
&toBitholdSize, &toSizeId);
sprintf((char *)toPrintBuffer, "%-5.1f %cBytes",
toBitholdSize, toSizeId);
MSGN_CALLBACK(pcontext, drMSG686,
fromPrintBuffer, toPrintBuffer);
pdbshm->bithold = bithreshold;
pdbshm->quietpoint = QUIET_POINT_NORMAL;
returnCode = 0;
}
else
{
/* Invalid value provided, request to change
bi threshold rejected */
MSGN_CALLBACK(pcontext, drMSG454);
MSGN_CALLBACK(pcontext, drMSG451);
returnCode = 3;
}
}
else
{
/* Invalid value provided, request to change
bi threshold rejected */
MSGN_CALLBACK(pcontext, drMSG454);
MSGN_CALLBACK(pcontext, drMSG451);
returnCode = 3;
}
}
}
else
/* The broker does not exist and shutdown may be in progress */
{
/* Broker is dead - abnormal shutdown of the database */
MSGN_CALLBACK(pcontext, drMSG400);
returnCode = 16;
}
return(returnCode);
}
