Hi, 

Just tested on master and this seems to work fine after a few app fixes. Having 
said that, I would recommend you build vcl native apps and register multiple 
workers for better performance.

Comments:
- make sure sockets are not blocking otherwise there’s a good change that only 
one of the threads will output something
- only print a message if data was received

See diff here [1].  

Example output, with 2 clients (c1 and c2) and updated ips. 

[snip]
vppcom_session_create:1410: vcl<233836:0>: created session 1
ldp<233836>: fd 33: calling vls_bind: vlsh 1, addr 0x7ffd7d7cf750, len 16
vppcom_session_bind:1599: vcl<233836:0>: session 1 handle 1: binding to local 
IPv4 address 7.0.0.2 port 12342, proto UDP
vppcom_session_listen:1628: vcl<233836:0>: session 1: sending vpp listen 
request...
vcl_session_bound_handler:569: vcl<233836:0>: session 1 [0x0]: listen succeeded!
ldp<233836>: fd 33 vlsh 1, cmd 4

[recv from 7.0.0.1:60414]c1 s1

[recv from 7.0.0.1:56760]c2 s1

[recv from 7.0.0.1:56760]c2 s2

[recv from 7.0.0.1:60414]c1 s2


Regards,
Florin

[1] https://pastebin.com/4LCukbEC

> On Sep 7, 2022, at 12:05 AM, nengjie wang <moho.man...@gmail.com> wrote:
> 
> The attachment is my server program.
> 
> My VPP version is 22.06. When I start this server by LDP and send a request 
> to this server, the server will have a direct segment error. Two threads 
> share an event queue, resulting in an event queue crash. Can you tell me if 
> LDP does not support this use?
> 
> In addition, I noticed that there is a configuration item called ‘muti thread 
> workers’ in the VCL configuration file. When this configuration is turned on, 
> the program can not receive RPC response. Is it suitable for me to use this 
> configuration item in this case?
> <udp_recv.c>
> 
> 

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