//
// Returns list of Ps with local work, they need to be scheduled by the caller.
func procresize(nprocs int32) *p {
	assertLockHeld(&sched.lock)
	assertWorldStopped()

	old := gomaxprocs
	if old < 0 || nprocs <= 0 {
		throw("procresize: invalid arg")
	}
	trace := traceAcquire()
	if trace.ok() {
		trace.Gomaxprocs(nprocs)
		traceRelease(trace)
	}