int unmap(mmu *m, int index, int instnnd){
int re = m->pageT[index].frameid;
char instname[6];
strcpy(instname, "UNMAP");
PRINT_INST(instnnd, instname, index, re);
resetPresent(&(m->pageT[index]));
resetReference(&(m->pageT[index]));
if (m->pageT[index].modified == 1){
pageOut(m, index, instnnd, re);
}
resetModified(&(m->pageT[index]));
m->frames[re] = -1;
m->frameN -= 1;
resetFrameid(&(m->pageT[index]));
m->unmaps_N += 1;
return re;
}
int BufferManager::findKey(int key) {
int checked[4] = {0, 0, 0, 0};
// Look for key in pages in memory
for (int i = 0; i < 2; i++) {
int pageNum = pageNums[i];
checked[pageNum - 1] = 1;
if (pages[i].findKey(key) != -1) { return i; }
}
// Look for key in pages on disk
for (int i = 0; i < 4; i++) {
if (checked[i] == 0) {
int pageNum = i + 1;
int index = selectVictim();
pageOut(index);
pageIn(index, pageNum);
if (pages[index].findKey(key) != -1) { return index; }
}
}
return -1;
}
void BufferManager::shutDown() {
// Flush pages to disk
pageOut(0);
pageOut(1);
}
