Run 2 executables simultaneously (ping & pong) best practices?

help
1

As a training, I wrote two simple programs using this mqtt library. One sends "ping", the other responds with "pong". I plan on writing similar ones in an asynchronous mode, so four programs, in a same project.

I guess I could put them next to each other in the same project, in src/ or lib/, however I wish to run them simultaneously. Is that do-able with cargo ? If not, what are the best practices ?

Will share the code (2 * 500 lines) here if needed. But I need to organize it properly before pushing it on github.

2

You can create three binaries:

  1. ping
  2. pong
  3. run - which can spawn ping & pong.

You can add this to Cargo.toml:

[package]
name = "mycrate"
version = "0.1.0"
authors = ["you"]
edition = "2018"
default-run = "run"

[[bin]]
path = "src/ping.rs"
name = "ping"

[[bin]]
path = "src/pong.rs"
name = "pong"

[[bin]]
path = "src/run.rs"
name = "run"
3

If you write this one as a test instead, then cargo 1.43 will set CARGO_BIN_EXE_ping/pong environment variables so you know where to find them.

1 Like
4

Thanks a lot to both of you.
I didn't know you could do that. I took over your Cargo.toml example, only without the run binary. Spawning several executables from a third one looks very interesting but goes beyond the scope of my exercise.

This is my Cargo.toml :

 [package]
name = "mqtt_ping_pong"
version = "0.1.0"
authors = ["Emmanuel Bosquet <bjokac@gmail.com>"]
edition = "2018"

[[bin]]
path = "src/sync_ping.rs"
name = "sync_ping"

[[bin]]
path = "src/sync_pong.rs"
name = "sync_pong"

[dependencies]
paho-mqtt = "0.6.0"

I'll ask my teacher to run in two terminals:

cargo run --bin sync_ping

cargo run --bin sync_pong

That works for me and it all fits nicely in one project. Thank you!

5

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