if !waitCondition(t, func() bool {
		rows.closemu.RLock()
		defer rows.closemu.RUnlock()
		return rows.closed
	}) {
		t.Fatal("failed to close rows")
	}
}

// TestQueryContextWait ensures that rows and all internal statements are closed when
// a query context is closed during execution.
func TestQueryContextWait(t *testing.T) {
	db := newTestDB(t, "people")
	defer closeDB(t, db)
	prepares0 := numPrepares(t, db)

	// and exclusively during close.
	//
	// closemu guards lasterr and closed.
	closemu sync.RWMutex
	lasterr error // non-nil only if closed is true
	closed  bool

	// closemuScanHold is whether the previous call to Scan kept closemu RLock'ed
	// without unlocking it. It does that when the user passes a *RawBytes scan

	if err == nil {
		panic("nil error")
	}
	pc.broken = true
	if pc.closed == nil {
		pc.closed = err
		pc.t.decConnsPerHost(pc.cacheKey)
		// Close HTTP/1 (pc.alt == nil) connection.
		// HTTP/2 closes its connection itself.
		if pc.alt == nil {
			if err != errCallerOwnsConn {
				pc.conn.Close()
			}
			close(pc.closech)
		}
	}
	pc.mutateHeaderFunc = nil
}

	fd := open(&buf[0], _OWRITE, 0)
	if fd < 0 {
		return -1
	}
	len := findnull(&msg[0])
	if write1(uintptr(fd), unsafe.Pointer(&msg[0]), int32(len)) != int32(len) {
		closefd(fd)
		return -1
	}
	closefd(fd)
	return 0
}

//go:nosplit
func exit(e int32) {
	var status []byte
	if e == 0 {
		status = emptystatus
	} else {
		// build error string
		var tmp [32]byte

		t.Errorf("roundTrip = %#v, %v; want errServerClosedIdle, transportReadFromServerError, or nothingWrittenError", err, err)
	}

	<-pc.closech
	err = pc.closed
	if !isNothingWrittenError(err) && !isTransportReadFromServerError(err) && err != errServerClosedIdle {
		t.Errorf("pc.closed = %#v, %v; want errServerClosedIdle or transportReadFromServerError, or nothingWrittenError", err, err)
	}
}

}

// Close closes the FD. The underlying file descriptor is closed by the
// destroy method when there are no remaining references.
func (fd *FD) Close() error {
	if !fd.fdmu.increfAndClose() {
		return errClosing(fd.isFile)
	}

	// Unblock any I/O.  Once it all unblocks and returns,
	// so that it cannot be referring to fd.sysfd anymore,
	// the final decref will close fd.sysfd. This should happen

    }

    @Override
    public void close() {
        if (closed) {
            // Already closed.
            return;
        }
        closed = true;
        for (Loader value : loaders.values()) {
            IoActions.closeQuietly(value);
        }
    }

    private void ensureOpened() {
        if (closed) {

}

func (b *streamingBitrotReader) Close() error {
	if b.rc == nil {
		return nil
	}
	if closer, ok := b.rc.(io.Closer); ok {
		// drain the body for connection reuse at network layer.
		xhttp.DrainBody(struct {
			io.Reader
			io.Closer
		}{
			Reader: b.rc,
			Closer: closeWrapper(func() error { return nil }),
		})
		return closer.Close()
	}
	return nil
}

	}

	// Delete the event from store.
	return target.store.Del(key.Name)
}

// Close - closes underneath connections to PostgreSQL database.
func (target *PostgreSQLTarget) Close() error {
	close(target.quitCh)
	if target.updateStmt != nil {
		// FIXME: log returned error. ignore time being.
		_ = target.updateStmt.Close()
	}

	if target.deleteStmt != nil {
		// FIXME: log returned error. ignore time being.

        registry.getAll(String)
        registry.close()

        when:
        registry.get(String)

        then:
        IllegalStateException e = thrown()
        e.message == "TestRegistry has been closed."

        when:
        registry.getAll(String)

        then:
        e = thrown()
        e.message == "TestRegistry has been closed."
    }