bool *getDirtyFlags (BM_BufferPool *const bm)
{
int i;
bool *dirtyFlags = malloc(sizeof(bool) * bm->numPages);
resetPages();
for(i = 0; i < bm->numPages; i++){
dirtyFlags[i] = pages->isMark;
if(i < bm->numPages-1)
pages = pages->nextPage;
}
resetPages();
return dirtyFlags;
}
int *getFixCounts (BM_BufferPool *const bm)
{
int i;
int *fixCounts = malloc(sizeof(int) * bm->numPages);
resetPages();
for(i = 0; i < bm->numPages; i++){
fixCounts[i] = pages->fixCount;
if(i < bm->numPages-1)
pages = pages->nextPage;
}
resetPages();
return fixCounts;
}
RC shutdownBufferPool (BM_BufferPool *const bm)
{
SM_FileHandle fh;
RC code = openPageFile(bm->pageFile, &fh);
if (code != RC_OK)
return code;
resetPages();
int i = 0;
for(i = 0; i < bm->numPages; i++){
if (pages->isMark && pages->fixCount > 0){
code = writeBlock(pages->pageNum, &fh, pages->pageData);
if(code != RC_OK)
return code;
metaData.numWriteIO++;
}
pages->isMark = false;
pages->pageData = malloc(PAGE_SIZE);
strcpy(pages->pageData, "");
pages->pageNum = -1;
pages->fixCount = 0;
pages->repStrat = -1;
if(i < bm->numPages-1){
pages = pages->nextPage;
}
}
closePageFile(&fh);
return RC_OK;
}
PageNumber *getFrameContents (BM_BufferPool *const bm)
{
PageNumber *frames = malloc(sizeof(int)* bm->numPages);
int i;
resetPages();
for(i = 0; i < bm->numPages; i++){
if(pages->pageNum > -1){
frames[i] = pages->pageNum;
}else{
frames[i] = -1;
}
if(i < bm->numPages-1)
pages = pages->nextPage;
}
resetPages();
return frames;
}
NavBarOptionsDialog::NavBarOptionsDialog(QWidget *parent) :
QDialog(parent)
{
setupUi(this);
connect(upButton, SIGNAL(clicked()), SLOT(movePageUp()));
connect(downButton, SIGNAL(clicked()), SLOT(movePageDown()));
connect(resetButton, SIGNAL(clicked()), SLOT(resetPages()));
connect(buttonBox, SIGNAL(accepted()), SLOT(accept()));
connect(buttonBox, SIGNAL(rejected()), SLOT(reject()));
connect(pageListWidget, SIGNAL(currentRowChanged(int)), SLOT(onCurrentRowChanged(int)));
}
void navPages(BM_BufferPool *const bm, int index){
resetPages();
int i;
for(i = 0; i < bm->numPages; i++){
if(i == index){
break;
}
if(i < bm->numPages-1){
pages = pages->nextPage;
}
}
}
RC unpinPage (BM_BufferPool *const bm, BM_PageHandle *const page)
{
resetPages();
int i;
for (i = 0; i < bm->numPages; i++) {
if (pages->pageNum == page->pageNum) {
break;
}
if(i < bm->numPages-1){
pages = pages->nextPage;
}
}
if(pages->isMark){
forcePage(bm, page);
}
pages->fixCount--;
resetPages();
return RC_OK;
}
RC forceFlushPool (BM_BufferPool *const bm)
{
int i = 0;
resetPages();
SM_FileHandle fh;
RC code = openPageFile(bm->pageFile, &fh);
if (code != RC_OK)
return code;
for(i = 0; i < bm->numPages; i++){
if (pages->isMark && pages->pageNum > -1){
pages->isMark = false;
}
if(i < bm->numPages-1){
pages = pages->nextPage;
}
}
resetPages();
closePageFile(&fh);
return RC_OK;
}
RC markDirty (BM_BufferPool *const bm, BM_PageHandle *const page)
{
resetPages();
int i;
for (i = 0; i < bm->numPages; i++) {
if (pages->pageNum > -1 && pages->pageNum == page->pageNum) {
break;
}
if(i < bm->numPages-1){
pages = pages->nextPage;
}
}
pages->isMark = true;
metaData.totalNumOfDirtyPages = metaData.totalNumOfDirtyPages++;
return RC_OK;
}
RC initBufferPool (BM_BufferPool *const bm, const char *const pageFileName, const int numPages, ReplacementStrategy strategy, void *stratData)
{
SM_FileHandle fh;
/*RC code = openPageFile((char*)pageFileName, &fh);
if(code != RC_OK){
return code;
}
closePageFile(&fh);
*/
int i = 0;
ThePage_t *temp;
pages = (ThePage_t*) malloc(sizeof(ThePage_t));
for(i = 0; i < numPages; i++){
pages->isMark = false;
pages->pageData = malloc(PAGE_SIZE);
strcpy(pages->pageData, "");
pages->pageNum = -1;
pages->fixCount = 0;
pages->repStrat = -1;
pages->nextPage = (ThePage_t*)malloc(sizeof(ThePage_t));
if(i == 0)
pages->prevPage = NULL;
else
pages->prevPage = temp;
temp = pages;
if(i < numPages-1){
pages->nextPage = (ThePage_t*) malloc(sizeof(ThePage_t));
temp = pages;
pages = pages->nextPage;
}
}
resetPages();
metaData.numReadIO = 0;
metaData.numWriteIO = 0;
metaData.totalRepStrat = 0;
metaData.totalNumOfDirtyPages = 0;
bm->pageFile = (char*)pageFileName;
bm->numPages = numPages;
bm->strategy = strategy;
bm->mgmtData = stratData;
return RC_OK;
}
RC pinPage (BM_BufferPool *const bm, BM_PageHandle *const page, const PageNumber pageNum)
{
int i;
resetPages();
int spotFound = -1;
for(i = 0; i < bm->numPages; i++){
if(pages->pageNum == -1){
spotFound = i;
break;
}
if(pages->pageNum == pageNum){
spotFound = i;
break;
}
if(i < bm->numPages-1){
pages = pages->nextPage;
}
}
int min = 999999;
if (spotFound == -1) {
resetPages();
for (i = 0; i < bm->numPages; i++) {
if (pages->fixCount == 0 && pages->repStrat < min) {
min = pages->repStrat;
spotFound = i;
}
if(i < bm->numPages-1){
pages = pages->nextPage;
}
}
}
resetPages();
for(i = 0; i < bm->numPages; i++){
if(i == spotFound)
break;
if(i < bm->numPages-1){
pages = pages->nextPage;
}
}
SM_FileHandle fH;
openPageFile(bm->pageFile, &fH);
if(pages->pageNum == pageNum){
if(bm->strategy == RS_LRU)
pages->repStrat = ++(metaData.totalRepStrat);
pages->fixCount++;
page->pageNum = pageNum;
strcpy(page->data, pages->pageData);
}else {
page->data = malloc(PAGE_SIZE);
page->pageNum = pageNum;
readBlock(pageNum, &fH, page->data);
metaData.numReadIO++;
pages->pageNum = pageNum;
pages->fixCount = 1;
pages->repStrat = ++(metaData.totalRepStrat);
pages->isMark = false;
}
closePageFile(&fH);
return RC_OK;
}
