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|
(.using
[library
[lux "*"
["@" target]
["[0]" ffi]
[abstract
["[0]" monad {"+" do}]]
[control
["[0]" try]
["[0]" exception {"+" exception:}]
["[0]" io {"+" IO io}]]
[data
["[0]" text]
[collection
["[0]" list]]]
[math
[number
["n" nat]
["f" frac]]]
[meta
["[0]" configuration]]
[time
["[0]" instant]]]]
[//
["[0]" atom {"+" Atom}]])
(with_expansions [<jvm> (these (ffi.import: java/lang/Object
"[1]::[0]")
(ffi.import: java/lang/Long
"[1]::[0]")
(ffi.import: java/lang/Runtime
"[1]::[0]"
("static" getRuntime [] java/lang/Runtime)
(availableProcessors [] int))
(ffi.import: java/lang/Runnable
"[1]::[0]")
(ffi.import: java/util/concurrent/TimeUnit
"[1]::[0]"
("enum" MILLISECONDS))
(ffi.import: java/util/concurrent/Executor
"[1]::[0]"
(execute [java/lang/Runnable] "io" void))
(ffi.import: (java/util/concurrent/ScheduledFuture a)
"[1]::[0]")
(ffi.import: java/util/concurrent/ScheduledThreadPoolExecutor
"[1]::[0]"
(new [int])
(schedule [java/lang/Runnable long java/util/concurrent/TimeUnit] "io" (java/util/concurrent/ScheduledFuture java/lang/Object))))]
(for @.old (these <jvm>)
@.jvm (these <jvm>)
@.js
(these (ffi.import: (setTimeout [ffi.Function ffi.Number] "io" Any)))
@.python
(ffi.import: threading/Timer
"[1]::[0]"
(new [ffi.Float ffi.Function])
(start [] "io" "?" Any))
... Default
(type: Thread
(Record
[#creation Nat
#delay Nat
#action (IO Any)]))
))
(def: .public parallelism
Nat
(with_expansions [<default> 1
<jvm> (<| (configuration.for ["lua_compiler?" ""]
... TODO: Remove this when Rembulan is no longer being used.
<default>)
(|> (java/lang/Runtime::getRuntime)
(java/lang/Runtime::availableProcessors)
ffi.of_int
.nat))]
(for @.old <jvm>
@.jvm <jvm>
... Default
<default>)))
(with_expansions [<jvm> (these (def: runner
java/util/concurrent/ScheduledThreadPoolExecutor
(|> ..parallelism
.int
ffi.as_int
java/util/concurrent/ScheduledThreadPoolExecutor::new)))]
(for @.old <jvm>
@.jvm <jvm>
@.js (these)
@.python (these)
... Default
(these (def: started?
(Atom Bit)
(atom.atom false))
(def: runner
(Atom (List Thread))
(atom.atom (list))))))
(def: (execute! action)
(-> (IO Any) Any)
(case (try (io.run! action))
{try.#Failure error}
(exec
("lux io log" (all "lux text concat"
"ERROR DURING THREAD EXECUTION:" text.new_line
error))
[])
{try.#Success _}
[]))
(def: .public (schedule! milli_seconds action)
(-> Nat (IO Any) (IO Any))
(with_expansions [<jvm> (let [runnable (ffi.object [] [java/lang/Runnable]
[]
(java/lang/Runnable [] (run self []) void
(..execute! action)))]
(case milli_seconds
0 (java/util/concurrent/Executor::execute runnable runner)
_ (java/util/concurrent/ScheduledThreadPoolExecutor::schedule runnable (.int milli_seconds) java/util/concurrent/TimeUnit::MILLISECONDS
runner)))]
(for @.old <jvm>
@.jvm <jvm>
@.js
(..setTimeout (ffi.function (_ []) Any (..execute! action))
(n.frac milli_seconds))
@.python
(do io.monad
[_ (|> (ffi.function (_ []) Any (..execute! action))
(threading/Timer::new (|> milli_seconds n.frac (f./ +1,000.0)))
threading/Timer::start)]
(in []))
... Default
(do [! io.monad]
[now (# ! each (|>> instant.millis .nat) instant.now)
_ (atom.update! (|>> {.#Item [#creation now
#delay milli_seconds
#action action]})
..runner)]
(in [])))))
(for @.old (these)
@.jvm (these)
@.js (these)
@.python (these)
... Default
(these (exception: .public cannot_continue_running_threads)
... https://en.wikipedia.org/wiki/Event_loop
... Starts the event-loop.
(def: .public run!
(IO Any)
(do [! io.monad]
[started? (atom.read! ..started?)]
(if started?
(in [])
(do !
[_ (atom.write! true ..started?)]
(loop (again [_ []])
(do !
[threads (atom.read! ..runner)]
(case threads
... And... we're done!
{.#End}
(in [])
_
(do !
[now (# ! each (|>> instant.millis .nat) instant.now)
.let [[ready pending] (list.partition (function (_ thread)
(|> (the #creation thread)
(n.+ (the #delay thread))
(n.<= now)))
threads)]
swapped? (atom.compare_and_swap! threads pending ..runner)]
(if swapped?
(do !
[_ (monad.each ! (|>> (the #action) ..execute! io.io) ready)]
(again []))
(panic! (exception.error ..cannot_continue_running_threads []))))
)))))))
))
|
