/* The main scheduling routine */
void schedule(event_type event) {
static int first = 1;
/* Set initial variables */
if (first) {
mem_init(memory);
finale = my_finale;
first = 0;
}
switch (event) {
case NewProcess_event:
GiveMemory();
break;
case Time_event:
case IO_event:
CPU_scheduler();
break;
case Ready_event:
break;
case Finish_event:
ReclaimMemory();
GiveMemory();
CPU_scheduler();
break;
default:
printf("I cannot handle event nr. %d\n", event);
break;
}
}
void CPU_pseudo_isr(CPU_p cpu, int PC) {
if (cpu->currentProcess != NULL) {
fprintf(file, "Timer interrupt...\n");
// 1. Change the state of the running process to interrupted
PCB_set_state(cpu->currentProcess, interrupted);
// 2. Save the CPU state to the PCB
PCB_set_pc(cpu->currentProcess, cpu->pc);
fprintf(file, "Process interrupted: %s",
PCB_toString(cpu->currentProcess));
//Replace PC of CPU will value stored in systemStack
cpu->pc = cpu->sysStack;
//cpu->pc = CPU_pop_sysStack(cpu);
// 3. "Do an up-call" to the scheduler
CPU_scheduler(cpu, timer, PC);
} else {
fprintf(file, "No process currently running. Normal interrupt...\n");
CPU_scheduler(cpu, normal, PC);
}
return;
}