Final pre-release

code/apictimer_trigger.cpp

@@ -1,4 +1,4 @@
-// Excerpt from the APIC timer interrupt handler
+// Excerpt from the ApicTimer interrupt handler
 void ApicTimer::trigger(const InterruptFrame &frame) {
     if (cpuId != LocalApic::getId()) {
         // Abort if the handler doesn't belong to the current CPU
@@ -7,4 +7,14 @@ void ApicTimer::trigger(const InterruptFrame &frame) {
 
     // Increase the "core-local" time
     time.addNanoseconds(timerInterval * 1'000'000); // Interval is in milliseconds
+
+    // Only the BSP may continue
+    if (cpuId != 0) {
+        return;
+    }
+
+    // Trigger preemption
+    if (time.toMilliseconds() % yieldInterval == 0) {
+        System::getService<SchedulerService>().yield();
+    }
 }