print causes hang

[chris-b1]

Running the example below through DaemonMode causes a hang and the following output after a Ctrl+c. This does not happen if I use println instead of print

# repro.jl
print("Hello world")

λ julia --startup-file=no --project=. -e "using DaemonMode; runargs()" repro.jl
hello worldDaemonMode::end
# <Ctrl + c>
Error, cannot connect with server. Is it running?

This is on Windows 10, Julia 1.5, DaemonMode 0.1.1

[dmolina]

It seems that the juliaserver is not running, have you do the following?

λ julia --startup-file=no --project=. -e "using DaemonMode; serve()" 

previously in another term? The idea is that there is running the server in one process or terminal, and them you run several times runargs() with the file[s] to run. The server is actually which run these files, to accelerate the time, because all functions and packages have been previously run.

[chris-b1]

Thanks for the reply @dmolina.

Yes, the server is running. When it's not running I get a graceful exit and error message, when it is running it hangs after running repro.jl

I'll take a closer look - given that this happens only with a print and not println I wonder if there's an assumption of a newline somewhere in the stdout handling

[chris-b1]

server

DaemonMode.jl/src/DaemonMode.jl

Lines 95 to 100 in 43ff5a7

	m = Module()
	add_include = Meta.parse("include(arg)=Base.include(@__MODULE__,arg)")
	Base.eval(m, add_include)
	run(m)
	end
	println(sock, token_end)

client

DaemonMode.jl/src/DaemonMode.jl

Lines 244 to 247 in 43ff5a7

	while (line != token_end)
	println(output, line)
	line = readline(sock)
	end

The issue is that if run doesn't end outputting a newline, the last line of the program output will also contain the token_end.

[dmolina]

Yes, you are right. I have checked now and fixed it in the current master version. I am adding a few new functionality, when I will have I submit a new version. However, now in the master version it is fixed.
Thank you a lot for your feedback!