*You have given a structure which has two member, One which stores the
time and other stores the function pointer Your function has to call the *
*function stored in the fuction poitner after the time given in the
structure elapses.
Design that function? *
Approach: To design this function I would use a min Heap data structure.
Each node of a heap has
two parameters one is the running time and other one is the
function pointer.
// Initialise a function pointer
typedef void (*functionToBeCalled)(int arg1, int arg2);
// Timer structure
typedef struct timer
{
float runingTime; // in terms of seconds
functionToBeCalled funcToBeCall; // function pointer
}TIMER;
void initTimer()
{
Initialise few nodes with running time and its corresponding function
Initialise a MIN heap data structure
}
void addTimer(uint32 runingTime, functionToBeCalled func)
{
TIMER *temp;
temp = (TIMER *)malloc(sizeof(TIMER));
temp->runingTime = runningTime
temp->funcToBeCall = func;
HeapAdd(temp);
Heapify();
}
void scheduler()
{
uint32 currentTime = ObtainCurrentTime();
// Obtain the runing time of top most element of the min Heap
uint32 runingTime = PeakHeap();
// if the runningTime is equal to current time then extract the
top most
// element of the heap and execute the function associate with
it
// Heapify the MIN heap data structure
// Obtain the runing time of top most element of the min heap
// scheduler sleep for that much amount of time.
if(runingTime == currentTime)
{
TIMER * node = ExtractMinHeap();
CreateThread(node->func, Thread);
Heapify();
runingTime = PeakHeap();
sleep(runningTime);
}
else
{
// scheduler updates its sleep time
// if runing time is not equal to current time
sleep(runningTime);
}
}
Let me know your comments
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