Method Start

pkg/sentry/kernel/kernel.go:1414–1446

Start starts execution of all tasks in k. Preconditions: Start may be called exactly once.

()

//
// Preconditions: Start may be called exactly once.
func (k *Kernel) Start() error {
	k.extMu.Lock()
	defer k.extMu.Unlock()

	if k.started {
		return fmt.Errorf("kernel already started")
	}

	k.started = true
	k.cpuClockTickTimer = time.NewTimer(linux.ClockTick)
	k.runningTasksMu.Lock()
	k.cpuClockTickerRunning = true
	k.runningTasksMu.Unlock()
	go k.runCPUClockTicker()
	// If k was created by LoadKernelFrom, timers were stopped during
	// Kernel.SaveTo and need to be resumed. If k was created by NewKernel,
	// this is a no-op.
	k.resumeTimeLocked(k.SupervisorContext())
	k.tasks.mu.RLock()
	ts := make([]*Task, 0, len(k.tasks.Root.tids))
	for t := range k.tasks.Root.tids {
		ts = append(ts, t)
	}
	k.tasks.mu.RUnlock()
	// Start task goroutines.
	// NOTE(b/235349091): We don't actually need the TaskSet mutex, we just
	// need to make sure we only call t.Start() once for each task. Holding the
	// mutex for each task start may cause a nested locking error.
	for _, t := range ts {
		t.Start(t.ThreadID())
	}
	return nil
}

// pauseTimeLocked pauses all Timers and Timekeeper updates.
//