/* Name: ShutDown BufferPool
* Behavior:Would shutdown an existing buffer pool.
* Version: 1.0.0 */
RC shutdownBufferPool(BM_BufferPool *const bm)
{
RC ret=RC_WRITE_FAILED;
int i ,*pgnums, *fixounts;
bool ispinned=FALSE;
Buffer_page_Dtl *pg_dtl;
BufferPool_Node *bufnode;
char *frame;
int currentaccessed;
// pthread_mutex_lock(&work_mutex_shutdown);//1st Incoming thread hold a lock.
fixounts=getFixCounts(bm);
pgnums=getFrameContents(bm);
for(i=0 ; i < bm->numPages ; i++)
{
if(fixounts[i] > 0)
{
ispinned=TRUE;//Condition to check for pinned pages before shut down.
}
}
free(fixounts);
if(ispinned==FALSE)
{
ret=RC_OK;
bufnode=search_data(BP_StNode_ptr,bm);//Get the active buffer pool from collection of pools.
currentaccessed=getfilebeingused(BP_StNode_ptr,bm->pageFile);//Check if the same pool is being shared.
if(bufnode!=NULL)
{
pg_dtl=bufnode->buffer_page_dtl;
if(pg_dtl!=NULL)
for(i=0;i<bm->numPages;i++)
{
frame=pg_dtl[i].pageframes;
if(pg_dtl[i].isdirty==TRUE)
{
ret=writeBlock(pg_dtl[i].pagenums,bm->mgmtData,frame)==RC_OK?RC_OK:RC_WRITE_FAILED;//Write the content with dirty to disk.
}
currentaccessed == 1 ?free(frame):' ';
}
currentaccessed == 1 ?free(pg_dtl):' ';
pg_dtl=NULL;
delete_node(&BP_StNode_ptr,bm);
}
currentaccessed == 1 ?closePageFile(bm->mgmtData):' ';
currentaccessed == 1 ?free(bm->mgmtData):' ';
}
// pthread_mutex_unlock(&work_mutex_shutdown);//1st Incoming thread release a lock.
free(pgnums);
return ret;
}
char *sprintPoolContent (BM_BufferPool *const bm)
{
PageNumber *frameContent;
bool *dirty;
int *fixCount;
int i;
char *message;
int pos = 0;
message = (char *) malloc(256 + (22 * bm->numPages));
frameContent = getFrameContents(bm);
dirty = getDirtyFlags(bm);
fixCount = getFixCounts(bm);
for (i = 0; i < bm->numPages; i++)
pos += sprintf(message + pos, "%s[%i%s%i]", ((i == 0) ? "" : ",") , frameContent[i], (dirty[i] ? "x": " "), fixCount[i]);
return message;
}
// external functions
void printPoolContent (BM_BufferPool *const bm)
{
PageNumber *frameContent;
bool *dirty;
int *fixCount;
int i;
frameContent = getFrameContents(bm);
dirty = getDirtyFlags(bm);
fixCount = getFixCounts(bm);
printf("{");
printStrat(bm);
printf(" %i}: ", bm->numPages);
for (i = 0; i < bm->numPages; i++)
printf("%s[%i%s%i]", ((i == 0) ? "" : ",") , frameContent[i], (dirty[i] ? "x": " "), fixCount[i]);
printf("\n");
}
/* Purpose:updates frame position considering if the page is pinned */
Frames_List *Update_Frame_Position(Frames_List *ReplaceNode,int PageNum,int FoundFlag,BM_BufferPool *const bm)
{
Frames_List *Temp,*LastNode,*Temp2;
int FrameNumberValue,PageNumberValue,i;
bool PinedPageFound=false;
Temp=ReplaceNode->head;
Frames_List *NewNode=CreateFrameNodes();
LastNode=ReplaceNode->last;
Temp=ReplaceNode->head;
int *fixCount = getFixCounts(bm);
if(FoundFlag==0)
{
while(Temp!=NULL)
{
if(fixCount[Temp->Frame_Number]==1){
Temp=Temp->next;
PinedPageFound=true;
FoundFlag=1;
}
else
break;
}
}
if(FoundFlag==1 && ReplaceNode->head->Page_Number!=PageNum)
{
if(LastNode->Page_Number==PageNum) return ReplaceNode;
while(Temp!=NULL && !(PinedPageFound))
{
if(Temp->Page_Number==PageNum)
break;
Temp=Temp->next;
}
FrameNumberValue=Temp->Frame_Number;
PageNumberValue=Temp->Page_Number;
Temp->previous->next=Temp->next;
Temp->next->previous=Temp->previous;
LastNode->next=NewNode;
NewNode->next=NULL;
NewNode->Frame_Number=FrameNumberValue;
NewNode->Page_Number=PageNumberValue;
NewNode->previous=LastNode;
free(Temp);
ReplaceNode->last=NewNode;
return ReplaceNode;
}
FrameNumberValue=Temp->Frame_Number;
ReplaceNode->head=Temp->next;
Temp->next->previous=NULL;
Temp->previous=NULL;
free(Temp);
NewNode->next=NULL;
NewNode->Frame_Number=FrameNumberValue;
NewNode->Page_Number=PageNum;
LastNode->next=NewNode;
NewNode->next=NULL;
NewNode->previous=LastNode;
ReplaceNode->last=NewNode;
Temp=ReplaceNode->head;
return ReplaceNode;
}
