For udp traffic, if send is ubuntu and receive is windows, -P, --parallel will lead iperf error

Send: linux(22.04.4)+iperf3 3.21
Receive: windows(win11 24H2)+iperf3 3.21

without -P, iperf3 pump udp traffic can success
with -P 4, iperf3 pump udp traffic failed with error "unable to read from stream socket: Resource temporarily unavailable"

```
root@WXCAB1-EPC1:~# iperf3 -c 192.168.1.14 -i 1 -u -b 40M -t 10
Connecting to host 192.168.1.14, port 5201
[ 5] local 192.168.1.11 port 40798 connected to 192.168.1.14 port 5201
[ ID] Interval Transfer Bitrate Total Datagrams
[ 5] 0.00-1.00 sec 4.77 MBytes 40.0 Mbits/sec 3457
[ 5] 1.00-2.00 sec 4.77 MBytes 40.0 Mbits/sec 3453
[ 5] 2.00-3.00 sec 4.77 MBytes 40.0 Mbits/sec 3453
[ 5] 3.00-4.00 sec 4.77 MBytes 40.0 Mbits/sec 3453
[ 5] 4.00-5.00 sec 4.77 MBytes 40.0 Mbits/sec 3453
[ 5] 5.00-6.00 sec 4.77 MBytes 40.0 Mbits/sec 3451
[ 5] 6.00-7.00 sec 4.77 MBytes 40.0 Mbits/sec 3455
[ 5] 7.00-8.00 sec 4.77 MBytes 40.0 Mbits/sec 3453
[ 5] 8.00-9.00 sec 4.77 MBytes 40.0 Mbits/sec 3453
[ 5] 9.00-10.00 sec 4.77 MBytes 40.0 Mbits/sec 3453
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.00 sec 47.7 MBytes 40.0 Mbits/sec 0.000 ms 0/34534 (0%) sender
[ 5] 0.00-10.01 sec 45.1 MBytes 37.8 Mbits/sec 0.530 ms 1898/34534 (5.5%) receiver

iperf Done.
root@WXCAB1-EPC1:~# iperf3 -c 192.168.1.14 -i 1 -u -b 40M -t 10 -P 4
Connecting to host 192.168.1.14, port 5201
[ 5] local 192.168.1.11 port 35980 connected to 192.168.1.14 port 5201
iperf3: error - unable to read from stream socket: Resource temporarily unavailable
root@WXCAB1-EPC1:~# iperf3 -v
iperf 3.21 (cJSON 1.7.15)
Linux WXCAB1-EPC1 6.8.0-52-generic #53~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Wed Jan 15 19:18:46 UTC 2 x86_64
Optional features available: CPU affinity setting, IPv6 flow label, TCP congestion algorithm setting, sendfile / zerocopy, socket pacing, bind to device, support IPv4 don't fragment, POSIX threads , GSO/GRO support

```