int _init(int n, size_t size)
{
if (checkInitParameters(n, size) != TRUE) return -1;
initManagerParams(n, size);
initMemory();
initPageTable();
initSwap();
return 0;
}
// Buffer Manager Interface Pool Handling
// ***************************************
RC initBufferPool(BM_BufferPool *const bm, const char *const pageFileName,
const int numPages, ReplacementStrategy strategy,
void *stratData)
{
BM_Pool_MgmtData *mgmtData;
int i;
// Initialize Pool
bm->pageFile= strdup(pageFileName);
bm->numPages= numPages;
bm->strategy= strategy;
// Initialize Pool Mgmt Data
mgmtData= MAKE_POOL_MGMTDATA();
mgmtData->io_reads= 0;
mgmtData->io_writes= 0;
mgmtData->stratData.fifoLastFreeFrame= -1;
mgmtData->stratData.lru_head= NULL;
mgmtData->stratData.lru_tail= NULL;
mgmtData->stratData.clockCurrentFrame= -1;
openPageFile(bm->pageFile, &mgmtData->fh);
initPageTable(&mgmtData->pt_head);
// Create Pool pages and initialize them
mgmtData->pool = MAKE_BUFFER_POOL(numPages);
for (i=0; i<numPages; i++)
{
mgmtData->pool[i].dirty= FALSE;
mgmtData->pool[i].fixCount= 0;
mgmtData->pool[i].pn= NO_PAGE;
// Add all frames in LRU list
// representing free frame to use.
appendMRUFrame(&mgmtData->stratData, &mgmtData->pool[i]);
mgmtData->pool[i].clockReplaceFlag= TRUE;
}
bm->mgmtData= mgmtData;
// Initialize thread lock
pthread_mutex_init(&mgmtData->bm_mutex, NULL);
RETURN(RC_OK);
}
