//joins contigious spans together
void coalescing(vector <Spans*> spansVector)
{
int firstBeginning = 0;
int firstEnding = 0;
int secondBeginning = 0;
int secondEnding = 0;
Spans* current = NULL;
Spans* next = NULL;
for(int i = 0; i < spansVector.size();i++)
{
current = spansVector[i];
next = spansVector[i+1];
firstBeginning = current->getBeginning();
firstEnding = current->getEnding();
secondBeginning = next->getBeginning();
secondEnding = next->getEnding();
if(firstEnding+1 == secondBeginning)
{
spansVector[i] = NULL;
spansVector[i+1] = NULL;
Spans* newSpan = new Spans(firstBeginning,firstEnding,true);
newSpan->setBeginning(firstBeginning);
newSpan->setEnding(secondEnding);
spansVector[i] = newSpan;
removeNULLsFromVector(spansVector);
}
}
}
void compareSpacesNeededToSpan(PCBStruct *newProcess,vector <string> &memoryTable,vector <Spans*> &spanVector)
{
int spacesNeeded = newProcess->getMemoryNeeded();
int spacesDifference = 0;
int spacesInSpan = 0;
vector<int> spacesDifferenceVector;
Spans* current = NULL;
for(int i = 0; i < spanVector.size();i++)
{
current = spanVector[i];
spacesInSpan = current->getEnding() - current->getBeginning() + 1;
if(spacesInSpan > spacesNeeded)
{
spacesDifference = spacesInSpan-spacesNeeded;
spacesDifferenceVector.push_back(spacesDifference);
}
else
{
spacesDifferenceVector.push_back(-1);
}
}
bestFit(newProcess,memoryTable,spanVector,spacesDifferenceVector);
worstFit(newProcess,memoryTable,spanVector,spacesDifferenceVector);
}
void nextFit(PCBStruct *newProcess,vector <string> &memoryTable,vector <Spans*> &spanVector)
{
findSpans(memoryTable,spanVector);
int spacesNeeded = newProcess->getMemoryNeeded();
int difference = 0;
int range = 0;
Spans* current = NULL;
for(int i = 0; i < spanVector.size();i++)
{
current = spanVector[i];
difference = current->getEnding() - current->getBeginning() + 1;
if(difference >= spacesNeeded)
{
range = current->getBeginning() + spacesNeeded;
for(int x = current->getBeginning(); x <= spacesNeeded; x++)
{
memoryTable[x] = newProcess->getProcessName();
}
}
}
findSpans(memoryTable,spanVector);
}
void matchVectors(vector <string> &memoryTable, vector <Spans*> spansVector)
{
int sizeOfTable = memoryTable.size();
int sizeOfVector = spansVector.size();
Spans* current = NULL;
for(int i = 0; i < sizeOfVector; i++)
{
current = spansVector[i];
for(int x = current->getBeginning(); x <= current->getEnding(); x++)
{
memoryTable[x] = current->getName();
}
}
}
//joins all contiguious spans together at end of table
void condensing(vector <Spans*> spanVector, vector <string> memoryTable)
{
coalescing(spanVector);
int totalFreeSpaces = 0;
int difference = 0;
Spans* current = NULL;
for(int i = 0; i < spanVector.size(); i++)
{
current = spanVector[i];
difference = current->getEnding() - current->getBeginning() + 1;
totalFreeSpaces = totalFreeSpaces + difference;
}
//move everything in memory table up if the address above it is free
for(int a = 1; a < memoryTable.size();a++)
{
if(memoryTable[a-1] == "free")
{
memoryTable[a -1] = memoryTable[a];
memoryTable[a] = "free";
}
}
for(int b = memoryTable.size()-totalFreeSpaces; b < totalFreeSpaces; b++)
{
memoryTable[b] = "free";
}
Spans* newSpan = new Spans(memoryTable.size()-totalFreeSpaces,totalFreeSpaces,free);
newSpan->setBeginning(memoryTable.size()-totalFreeSpaces);
newSpan->setEnding(totalFreeSpaces);
resetSpanVector(spanVector);
spanVector.push_back(newSpan);
}
bool firstFit(PCBStruct *newProcess,vector <string> &memoryTable,vector <Spans*> &spanVector)
{
int spacesNeeded = newProcess->getMemoryNeeded();
int sizeOfTable = memoryTable.size();
int sizeOfVector = spanVector.size();
int difference = 0;
int range = 0;
int counter = 0;
Spans* currentSpan = NULL;
for(int a = 0; a < sizeOfVector; a++)
{
currentSpan = spanVector[a];
difference = currentSpan->getEnding() - currentSpan->getBeginning() + 1;
range = currentSpan->getBeginning() + spacesNeeded;
// cout << "needed: " << spacesNeeded << "\tdifference: " << difference << endl;
if(difference >= spacesNeeded)
{
counter = currentSpan->getBeginning();
currentSpan->setName(newProcess->getProcessName());
cout << "255" << endl;
for(int i = currentSpan->getBeginning(); i < range; i++)
{
memoryTable[i] = newProcess->getProcessName();
}
return true;
}
else
{
return false;
}
}
//cout << "259" << endl << endl << endl;
// showMemoryTable(newProcess,memoryTable,spanVector);
}