Close Multi timers atexit. Add 1.6 CI

src/Curl/Multi.jl

@@ -8,6 +8,12 @@
     function Multi(grace::Integer = typemax(UInt64))
         multi = new(ReentrantLock(), C_NULL, nothing, Easy[], grace)
         finalizer(done!, multi)
+        lock(MULTIS_LOCK)
+        try
+            push!(MULTIS, WeakRef(multi))
+        catch
+            unlock(MULTIS_LOCK)
+        end
         return multi
     end
 end
@@ -52,6 +58,15 @@
     end
 end
 
+const MULTIS_LOCK = Base.ReentrantLock()
+const MULTIS = WeakRef[]
+# Close any Multis and their timers at exit that haven't been finalized by then
+Base.atexit() do
+    for w in MULTIS
+        w.value isa Multi && done!(w.value)
+    end
+end
+
 function remove_handle(multi::Multi, easy::Easy)
     lock(multi.lock) do
         @check curl_multi_remove_handle(multi.handle, easy.handle)

src/Downloads.jl

@@ -467,11 +467,8 @@ end
 
 # Precompile
 let
-    d = Downloader(; grace=0.01)
+    d = Downloader()
     download("file://" * @__FILE__; downloader=d)
-    # Ref https://github.com/JuliaLang/julia/issues/49513
-    # we wait for the grace task to finish
-    sleep(0.05)
     precompile(Tuple{typeof(Downloads.download), String, String})
     precompile(Tuple{typeof(Downloads.Curl.status_2xx_ok), Int64})
 end