// goroutineProfiled field cleared.
	forEachGRace(func(gp1 *g) {
		gp1.goroutineProfiled.Store(goroutineProfileAbsent)
	})

	if raceenabled {
		raceacquire(unsafe.Pointer(&labelSync))
	}

	if n != int(endOffset) {
		// It's a big surprise that the number of goroutines changed while we
		// were collecting the profile. But probably better to return a

}

func Read(fd int, p []byte) (n int, err error) {
	n, err = read(fd, p)
	if raceenabled {
		if n > 0 {
			raceWriteRange(unsafe.Pointer(&p[0]), n)
		}
		if err == nil {
			raceAcquire(unsafe.Pointer(&ioSync))
		}
	}
	return
}

func Write(fd int, p []byte) (n int, err error) {
	if raceenabled {
		raceReleaseMerge(unsafe.Pointer(&ioSync))
	}
	n, err = write(fd, p)