// 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

		m := int(iovecs[i].Len)
		if m > n {
			m = n
		}
		n -= m
		if m > 0 {
			raceWriteRange(unsafe.Pointer(iovecs[i].Base), m)
		}
	}
	if err == nil {
		raceAcquire(unsafe.Pointer(&ioSync))
	}
}

func Writev(fd int, iovs [][]byte) (n int, err error) {
	iovecs := make([]Iovec, 0, minIovec)
	iovecs = appendBytes(iovecs, iovs)
	if raceenabled {

func ReadFile(fd Handle, p []byte, done *uint32, overlapped *Overlapped) error {
	err := readFile(fd, p, done, overlapped)
	if raceenabled {
		if *done > 0 {
			raceWriteRange(unsafe.Pointer(&p[0]), int(*done))
		}
		raceAcquire(unsafe.Pointer(&ioSync))
	}
	return err
}

func WriteFile(fd Handle, p []byte, done *uint32, overlapped *Overlapped) error {
	if raceenabled {
		raceReleaseMerge(unsafe.Pointer(&ioSync))
	}

}

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)