handle signals gracefully?

[StefanKarpinski]

As reported in JuliaLang/Pkg.jl#3060, Downloads doesn't handle ctrl-C or other signals gracefully at all and tends to crash. Even if you luck out and it doesn't crash, it tends to end up in a corrupted state such that future downloads will fail. @vtjnash, any advice on how to handle signals more gracefully here?

[xgdgsc]

Is it fixed by the latest commit? I see crashes everyday when I forgot to activate . before add and want to cancel the add.

[StefanKarpinski]

On Julia master, Downloads now has try/catch blocks in all callbacks, which might help, but I don't know if that fixes this issue or not. Have you tried using a nightly Julia? Let me know if it is better.

[xgdgsc]

Tried Version 1.9.0-DEV.1787 (2022-11-09) . Still crashes on ctrl+c.

(@v1.9) pkg> add Plots
    Updating registry at `~/.julia/registries/General.toml`
^Cfatal: error thrown and no exception handler available. ]  28.4 %%
InterruptException()
_jl_mutex_unlock at /cache/build/default-amdci4-2/julialang/julia-master/src/threading.c:796
jl_mutex_unlock at /cache/build/default-amdci4-2/julialang/julia-master/src/julia_locks.h:81 [inlined]
ijl_task_get_next at /cache/build/default-amdci4-2/julialang/julia-master/src/partr.c:385
poptask at ./task.jl:963
wait at ./task.jl:972
task_done_hook at ./task.jl:672
jfptr_task_done_hook_38006.clone_1 at /home/sgao/Documents/Apps/julia-dd62fac340/lib/julia/sys.so (unknown line)
_jl_invoke at /cache/build/default-amdci4-2/julialang/julia-master/src/gf.c:2450 [inlined]
ijl_apply_generic at /cache/build/default-amdci4-2/julialang/julia-master/src/gf.c:2632
jl_apply at /cache/build/default-amdci4-2/julialang/julia-master/src/julia.h:1868 [inlined]
jl_finish_task at /cache/build/default-amdci4-2/julialang/julia-master/src/task.c:320
start_task at /cache/build/default-amdci4-2/julialang/julia-master/src/task.c:1100

[StefanKarpinski]

@vtjnash, any idea how to handle this better?

[xgdgsc]

Same as JuliaLang/julia#34184 (comment) ?

[vtjnash]

In theory, this means a task recently exited and nobody cared about the result (as of yet). In practice, it seems quite common. Does this mean Julia programs are not good about "task nursery" concepts? Or just that sync is delayed? It is unclear.

[ViralBShah]

Would be nice if this particular issue could be fixed. I was using the package manager through a slow and unrepsonsive internet connection and had to keep ctrl-c'ing and Julia kept crashing.

[jpsamaroo]

This situation could presumably be greatly improved by JuliaLang/julia#49541