//Start tracking a CPU burst
int
sys_start_burst(void)
{
//get current system time tick
uint xticks = sys_uptime();
//keep track of current tick as burst start
proc->burstStart = xticks;
return xticks;
}
// lab1-2
int
sys_lottery(void)
{
struct tstat *dist[NPROC] = {};
getdistribution(*dist);
cprintf("ticks: %d\n", sys_uptime());
//for(int x;x<NPROC;x++) {
// cprintf("%s|%d|%d|%d\n", dist[x]->name, dist[x]->pid, dist[x]->totaltickets, dist[x]->numexecuted);
//}
return 0;
}
//End tracking a CPU burst
int
sys_end_burst(void)
{
//get current system time tick
uint xticks = sys_uptime();
//calculate cpu burst
int burst = xticks - proc->burstStart;
if (burst == 0) return 0;
//store the burst into array
int size = sizeof(proc->bursts) / sizeof(int);
proc->bursts[proc->burstIdx++ % size] = burst;
return burst;
}
//Print all CPU burst of a process
int
sys_print_bursts(void)
{
int idx = proc->burstIdx;
if (idx <= 0) {
cprintf("There is no CPU bursts yet.\r\n");
return 0;
}
int size = sizeof(proc->bursts) / sizeof(int);
int i;
for (i = 0; i < idx; i++) {
cprintf("%d, ", proc->bursts[i % size]);
}
/* Machine Problem 1.3: Modifying the Scheduler */
int turnaround = sys_uptime() - proc->creationTime;
cprintf("Turnaround time: %d\r\n", turnaround);
return idx;
}
