// which is used in blocking and mutex profiles.
type blockRecord struct {
	count  float64
	cycles int64
}

var (
	mbuckets atomic.UnsafePointer // *bucket, memory profile buckets
	bbuckets atomic.UnsafePointer // *bucket, blocking profile buckets
	xbuckets atomic.UnsafePointer // *bucket, mutex profile buckets
	buckhash atomic.UnsafePointer // *buckhashArray

	mProfCycle mProfCycleHolder
)