TimeQueue.cpp
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上传日期:2022-05-23
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- /* Copyright (C) 2003 MySQL AB
- 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 */
- #include "TimeQueue.hpp"
- #include <ErrorHandlingMacros.hpp>
- #include <GlobalData.hpp>
- #include <FastScheduler.hpp>
- #include <VMSignal.hpp>
- #include <Error.hpp>
- static const int MAX_TIME_QUEUE_VALUE = 32000;
- TimeQueue::TimeQueue()
- {
- clear();
- }
- TimeQueue::~TimeQueue()
- {
- }
- void
- TimeQueue::clear()
- {
- globalData.theNextTimerJob = 65535;
- globalData.theCurrentTimer = 0;
- globalData.theShortTQIndex = 0;
- globalData.theLongTQIndex = 0;
- for (int i = 0; i < MAX_NO_OF_TQ; i++)
- theFreeIndex[i] = i+1;
- theFreeIndex[MAX_NO_OF_TQ - 1] = NULL_TQ_ENTRY;
- globalData.theFirstFreeTQIndex = 0;
- }
- void
- TimeQueue::insert(Signal* signal, BlockNumber bnr,
- GlobalSignalNumber gsn, Uint32 delayTime)
- {
- if (delayTime == 0)
- delayTime = 1;
- register Uint32 regCurrentTime = globalData.theCurrentTimer;
- register Uint32 i;
- register Uint32 regSave;
- register TimerEntry newEntry;
-
- newEntry.time_struct.delay_time = regCurrentTime + delayTime;
- newEntry.time_struct.job_index = getIndex();
- regSave = newEntry.copy_struct;
-
- globalScheduler.insertTimeQueue(signal, bnr, gsn,
- newEntry.time_struct.job_index);
-
- if (newEntry.time_struct.delay_time < globalData.theNextTimerJob)
- globalData.theNextTimerJob = newEntry.time_struct.delay_time;
- if (delayTime < 100){
- register Uint32 regShortIndex = globalData.theShortTQIndex;
- if (regShortIndex == 0){
- theShortQueue[0].copy_struct = newEntry.copy_struct;
- } else if (regShortIndex >= MAX_NO_OF_SHORT_TQ - 1) {
- ERROR_SET(ecError, ERROR_TIME_QUEUE_SHORT,
- "Too many in Short Time Queue", "TimeQueue.C" );
- } else {
- for (i = 0; i < regShortIndex; i++) {
- if (theShortQueue[i].time_struct.delay_time >
- newEntry.time_struct.delay_time) {
-
- regSave = theShortQueue[i].copy_struct;
- theShortQueue[i].copy_struct = newEntry.copy_struct;
- break;
- }
- }
- if (i == regShortIndex) {
- theShortQueue[regShortIndex].copy_struct = regSave;
- } else {
- for (i++; i < regShortIndex; i++) {
- register Uint32 regTmp = theShortQueue[i].copy_struct;
- theShortQueue[i].copy_struct = regSave;
- regSave = regTmp;
- }
- theShortQueue[regShortIndex].copy_struct = regSave;
- }
- }
- globalData.theShortTQIndex = regShortIndex + 1;
- } else if (delayTime <= (unsigned)MAX_TIME_QUEUE_VALUE) {
- register Uint32 regLongIndex = globalData.theLongTQIndex;
- if (regLongIndex == 0) {
- theLongQueue[0].copy_struct = newEntry.copy_struct;
- } else if (regLongIndex >= MAX_NO_OF_LONG_TQ - 1) {
- ERROR_SET(ecError, ERROR_TIME_QUEUE_LONG,
- "Too many in Long Time Queue", "TimeQueue.C" );
- } else {
- for (i = 0; i < regLongIndex; i++) {
- if (theLongQueue[i].time_struct.delay_time >
- newEntry.time_struct.delay_time) {
-
- regSave = theLongQueue[i].copy_struct;
- theLongQueue[i].copy_struct = newEntry.copy_struct;
- break;
- }
- }
- if (i == regLongIndex) {
- theLongQueue[regLongIndex].copy_struct = regSave;
- } else {
- for (i++; i < regLongIndex; i++) {
- register Uint32 regTmp = theLongQueue[i].copy_struct;
- theLongQueue[i].copy_struct = regSave;
- regSave = regTmp;
- }
- theLongQueue[regLongIndex].copy_struct = regSave;
- }
- }
- globalData.theLongTQIndex = regLongIndex + 1;
- } else {
- ERROR_SET(ecError, ERROR_TIME_QUEUE_DELAY,
- "Too long delay for Time Queue", "TimeQueue.C" );
- }
- }
- // executes the expired signals;
- void
- TimeQueue::scanTable()
- {
- register Uint32 i, j;
-
- globalData.theCurrentTimer++;
- if (globalData.theCurrentTimer == 32000)
- recount_timers();
- if (globalData.theNextTimerJob > globalData.theCurrentTimer)
- return;
- globalData.theNextTimerJob = 65535; // If no more timer jobs
- for (i = 0; i < globalData.theShortTQIndex; i++) {
- if (theShortQueue[i].time_struct.delay_time > globalData.theCurrentTimer){
- break;
- } else {
- releaseIndex((Uint32)theShortQueue[i].time_struct.job_index);
- globalScheduler.scheduleTimeQueue(theShortQueue[i].time_struct.job_index);
- }
- }
- if (i > 0) {
- for (j = i; j < globalData.theShortTQIndex; j++)
- theShortQueue[j - i].copy_struct = theShortQueue[j].copy_struct;
- globalData.theShortTQIndex -= i;
- }
- if (globalData.theShortTQIndex != 0) // If not empty
- globalData.theNextTimerJob = theShortQueue[0].time_struct.delay_time;
- for (i = 0; i < globalData.theLongTQIndex; i++) {
- if (theLongQueue[i].time_struct.delay_time > globalData.theCurrentTimer) {
- break;
- } else {
- releaseIndex((Uint32)theLongQueue[i].time_struct.job_index);
- globalScheduler.scheduleTimeQueue(theLongQueue[i].time_struct.job_index);
- }
- }
- if (i > 0) {
- for (j = i; j < globalData.theLongTQIndex; j++)
- theLongQueue[j - i].copy_struct = theLongQueue[j].copy_struct;
- globalData.theLongTQIndex -= i;
- }
- if (globalData.theLongTQIndex != 0) // If not empty
- if (globalData.theNextTimerJob > theLongQueue[0].time_struct.delay_time)
- globalData.theNextTimerJob = theLongQueue[0].time_struct.delay_time;
- }
- void
- TimeQueue::recount_timers()
- {
- Uint32 i;
- globalData.theCurrentTimer = 0;
- globalData.theNextTimerJob -= 32000;
- for (i = 0; i < globalData.theShortTQIndex; i++)
- theShortQueue[i].time_struct.delay_time -= 32000;
- for (i = 0; i < globalData.theLongTQIndex; i++)
- theLongQueue[i].time_struct.delay_time -= 32000;
- }
- Uint32
- TimeQueue::getIndex()
- {
- Uint32 retValue = globalData.theFirstFreeTQIndex;
- globalData.theFirstFreeTQIndex = (Uint32)theFreeIndex[retValue];
- if (retValue >= MAX_NO_OF_TQ)
- ERROR_SET(fatal, ERROR_TIME_QUEUE_INDEX,
- "Index out of range", "TimeQueue.C" );
- return retValue;
- }
- void
- TimeQueue::releaseIndex(Uint32 aIndex)
- {
- theFreeIndex[aIndex] = globalData.theFirstFreeTQIndex;
- globalData.theFirstFreeTQIndex = aIndex;
- }