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REPL: add lock to orchestrate adding repl modes etc. #54890

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REPL: add lock to orchestrate adding repl modes etc. #54890

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8 changes: 5 additions & 3 deletions stdlib/REPL/src/LineEdit.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -2845,12 +2845,14 @@ keymap_data(s::PromptState, prompt::Prompt) = prompt.repl
keymap(ms::MIState, m::ModalInterface) = keymap(state(ms), mode(ms))
keymap_data(ms::MIState, m::ModalInterface) = keymap_data(state(ms), mode(ms))

# should be locked when adding/editing a repl mode etc.
const repl_mutate_lock = Base.ReentrantLock()

function prompt!(term::TextTerminal, prompt::ModalInterface, s::MIState = init_state(term, prompt))
Base.reseteof(term)
l = Base.ReentrantLock()
t1 = Threads.@spawn :interactive while true
wait(s.async_channel)
status = @lock l begin
status = @lock repl_mutate_lock begin
fcn = take!(s.async_channel)
fcn(s)
end
Expand All @@ -2865,7 +2867,7 @@ function prompt!(term::TextTerminal, prompt::ModalInterface, s::MIState = init_s
# and we want to not block typing when the repl task thread is busy
t2 = Threads.@spawn :interactive while true
eof(term) || peek(term) # wait before locking but don't consume
@lock l begin
@lock repl_mutate_lock begin
kmap = keymap(s, prompt)
fcn = match_input(kmap, s)
kdata = keymap_data(s, prompt)
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