func (p *Pool) Close() {
	p.mu.RLock()
	defer p.mu.RUnlock()
	close(p.connCh)

	for conn := range p.connCh {
		conn.Close()
	}
}
// Close close all conn.
Close close all conn.
// Close close all conn .
func (p *Pool) Close() {
	p.mu.RLock()
	defer p.mu.RUnlock()
	close(p.connCh)
	for conn := range p.connCh {
		conn.Close()
	}
}
func ( p * Pool ) Close ( ) { p . mu . RLock ( ) defer p . mu . RUnlock ( ) close ( p . connCh ) for conn := range p . connCh { conn . Close ( ) } }
Close close all conn.
Close close all conn .