}
}

func metricsUnlock() {
	if raceenabled {
		racerelease(unsafe.Pointer(&metricsSema))
	}
	semrelease(&metricsSema)
}

// initMetrics initializes the metrics map if it hasn't been yet.
//
// metricsSema must be held.
func initMetrics() {
	if metricsInit {
		return
	}

	sizeClassBuckets = make([]float64, _NumSizeClasses, _NumSizeClasses+1)

	stw := stopTheWorld(stwForTestReadMetricsSlow)

	// Initialize the metrics beforehand because this could
	// allocate and skew the stats.
	metricsLock()
	initMetrics()

	systemstack(func() {
		// Donate the racectx to g0. readMetricsLocked calls into the race detector
		// via map access.
		getg().racectx = getg().m.curg.racectx