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Add comments and change implementation slightly

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This commit is contained in:
Isaac Shoebottom
2023-12-02 21:30:51 -04:00
parent 4494f47a32
commit 7d4ecdaba6
2 changed files with 10 additions and 10 deletions
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18
Assignment8/code/disk.c
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@@ -36,7 +36,7 @@ void enqueue(DiskQueue *queue, int time, int position) {
queue->size++; queue->size++;
} }
DiskRequest *delete(DiskQueue *queue, DiskRequest request) { void delete(DiskQueue *queue, DiskRequest request) {
DiskRequest *current = queue->head; DiskRequest *current = queue->head;
DiskRequest *previous = NULL; DiskRequest *previous = NULL;
while (current != NULL) { while (current != NULL) {
@@ -47,7 +47,7 @@ DiskRequest *delete(DiskQueue *queue, DiskRequest request) {
previous->next = current->next; previous->next = current->next;
} }
queue->size--; queue->size--;
return current; return;
} }
previous = current; previous = current;
current = current->next; current = current->next;
@@ -82,14 +82,14 @@ DiskRequest* findClosest(DiskQueue *queue, int position, double time) {
DiskRequest *current = queue->head; DiskRequest *current = queue->head;
DiskRequest *closest = NULL; DiskRequest *closest = NULL;
while (current != NULL) { while (current != NULL) {
if (current->time <= time) { if (current->time <= time) { // Filter out requests that haven't come in yet
if (closest == NULL) { if (closest == NULL) { // If there is no closest yet, set it to the current
closest = current; closest = current;
} else { } else {
int closestDistance = closest->position - position; int closestDistance = closest->position - position; // Distance from the closest to the current position, negative means down (bad)
int currentDistance = current->position - position; int currentDistance = current->position - position; // Distance from the current to the current position, negative means down (bad)
if (currentDistance > 0) { if (currentDistance > 0) { // If the current is up
if (currentDistance < closestDistance) { if (currentDistance < closestDistance) { // If the current is closer than the closest
closest = current; closest = current;
} }
} }
@@ -101,5 +101,5 @@ DiskRequest* findClosest(DiskQueue *queue, int position, double time) {
if (closest == NULL) { if (closest == NULL) {
return NULL; return NULL;
} }
return delete(queue, *closest); return closest;
} }

2
Assignment8/code/disk.h
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@@ -19,7 +19,7 @@ DiskQueue *createDiskQueue();
void enqueue(DiskQueue *queue, int time, int position); void enqueue(DiskQueue *queue, int time, int position);
DiskRequest *delete(DiskQueue *queue, DiskRequest request); void delete(DiskQueue *queue, DiskRequest request);
DiskRequest peek(DiskQueue *queue); DiskRequest peek(DiskQueue *queue);