Updating plots from another thread

[bryaan]

I am trying to build a canonical example for updating a plot from another thread using the most performant means.

This is my attempt so far, but it is randomly failing after a few minutes with a bounds access error.

using GLMakie

fig = Figure()

# Heatmap 
cm = rand(500, 500)
const heatmap_series = Observable(cm)

ax = Axis(fig[3, 1])
heatmap!(ax, heatmap_series, colormap=:thermal)


# Line plot
x = range(0, 100, length=100000)
y = sin.(x)
plot_series = Observable(Point2f.(x, y))

ax = Axis(fig[2, :])
lines!(ax, plot_series)


gl_screen = display(fig)

plot_series_data_lock = ReentrantLock()

tm = Timer((timer) -> begin
        lock(plot_series_data_lock) do
            notify(heatmap_series)
            notify(plot_series)
        end
    end, 0.0, interval=1 / 10)

i = 1
Threads.@spawn while true
    lock(plot_series_data_lock) do
        heatmap_series[] = rand(500, 500)
        push!(plot_series[], Point2f(i, cos(i)))
    end

    global i += 1

    # GC.safepoint()
    sleep(0.2)
end

wait(gl_screen)

[SimonDanisch]

obs[] = newval already notifies