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pixie/pixie/stacklets.pxi at vector-exceptions · thomasmulvaney/pixie · GitHub
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(ns pixie.stacklets
(:require [pixie.uv :
as
uv]
[pixie.ffi :
as
ffi]))
;; If we don
'
t do this, compiling this file doesn
'
t work since the
def
will clear out
;; the existing value.
(when (undefined? (var stacklet
-
loop
-
h))
(
def
stacklet
-
loop
-
h (atom nil))
(
def
running
-
threads (atom
0
))
(
def
main
-
loop
-
running? (atom false))
(
def
main
-
loop
-
lock (
-
create
-
lock))
(
-
acquire
-
lock main
-
loop
-
lock true))
;; Yield
(defrecord ThrowException [ex])
(defn run
-
and
-
process
([k]
(run
-
and
-
process k nil))
([k val]
(let [[h f] (k val)]
(f h))))
(defn exception
-
on
-
uv
-
error [result]
(when (neg? result)
(
-
>
ThrowException (
str
"
UV Error:
"
(uv
/
uv_err_name result)))))
(defn call
-
cc [f]
(let [frames (
-
get
-
current
-
var
-
frames nil)
[h val] (@stacklet
-
loop
-
h f)]
(reset! stacklet
-
loop
-
h h)
(
-
set
-
current
-
var
-
frames nil frames)
(
if
(instance? ThrowException val)
(throw [::
Exception
(:ex val)])
val)))
(defn
-
run
-
later [f]
(let [a (uv
/
uv_async_t)
cb (atom nil)]
(reset! cb (ffi
/
ffi
-
prep
-
callback uv
/
uv_async_cb
(fn [handle]
(
try
(uv
/
uv_close a close_cb)
(
-
dispose! @cb)
(f)
(catch ex (println ex))))))
(uv
/
uv_async_init (uv
/
uv_default_loop) a @cb)
(uv
/
uv_async_send a)
(when (
not
@main
-
loop
-
running?)
(reset! main
-
loop
-
running? true)
(
-
release
-
lock main
-
loop
-
lock))
nil))
(defn
yield
-
control []
(call
-
cc (fn [k]
(
-
run
-
later (partial run
-
and
-
process k)))))
(
def
close_cb (ffi
/
ffi
-
prep
-
callback uv
/
uv_close_cb
pixie.ffi
/
dispose!))
;;; Sleep
(defn sleep
([ms]
(sleep ms false))
([ms background?]
(let [f (fn [k]
(let [cb (atom nil)
timer (uv
/
uv_timer_t)]
(reset! cb (ffi
/
ffi
-
prep
-
callback uv
/
uv_timer_cb
(fn [handle]
(
try
(run
-
and
-
process k)
(uv
/
uv_timer_stop timer)
(
-
dispose! @cb)
(catch ex
(println ex))))))
(uv
/
uv_timer_init (uv
/
uv_default_loop) timer)
(when background?
(uv
/
uv_unref timer))
(uv
/
uv_timer_start timer @cb ms
0
)))]
(call
-
cc f))))
;; Spawn
(defn
-
spawn [start
-
fn]
(call
-
cc (fn [k]
(
-
run
-
later (fn []
(run
-
and
-
process (new
-
stacklet start
-
fn))))
(
-
run
-
later (partial run
-
and
-
process k)))))
(defmacro spawn [
&
body]
`(let [frames (
-
get
-
current
-
var
-
frames nil)]
(
-
spawn (fn [h
#
_]
(
-
set
-
current
-
var
-
frames nil frames)
(
try
(swap! running
-
threads inc)
(reset! stacklet
-
loop
-
h h
#
)
(let [result
#
(do ~@body)]
(swap! running
-
threads dec)
(call
-
cc (fn [_] nil)))
(catch e
(println e)))))))
(defmacro spawn
-
background [
&
body]
`(let [frames (
-
get
-
current
-
var
-
frames nil)]
(
-
spawn (fn [h
#
_]
(
-
set
-
current
-
var
-
frames nil frames)
(
try
(reset! stacklet
-
loop
-
h h
#
)
(let [result
#
(do ~@body)]
(call
-
cc (fn [_] nil)))
(catch e
(println e)))))))
(defn spawn
-
from
-
non
-
stacklet [f]
(let [s (new
-
stacklet (fn [h _]
(
try
(reset! stacklet
-
loop
-
h h)
(swap! running
-
threads inc)
(f)
(swap! running
-
threads dec)
(call
-
cc (fn [_] nil))
(catch e
(println e)))))]
(
-
run
-
later
(fn []
(run
-
and
-
process s)))))
(defn finalizer
-
loop []
(spawn
-
background
(loop []
(
-
run
-
finalizers)
(sleep
1000
true)
(recur))))
(defn
-
with
-
stacklets [fn]
(swap! running
-
threads inc)
(reset! main
-
loop
-
running? true)
(let [[h f] ((new
-
stacklet fn) nil)]
(f h)
(loop []
(uv
/
uv_run (uv
/
uv_default_loop) uv
/
UV_RUN_DEFAULT)
(when (
>
@running
-
threads
0
)
(reset! main
-
loop
-
running? false)
(
-
acquire
-
lock main
-
loop
-
lock true)
(recur)))))
(defmacro
with
-
stacklets [
&
body]
`(
-
with
-
stacklets
(fn [h
#
_]
(
try
(reset! stacklet
-
loop
-
h h
#
)
(finalizer
-
loop)
(let [result
#
(do ~@body)]
(swap! running
-
threads dec)
(call
-
cc (fn [_] nil)))
(catch e
(println e))))))
(defn run
-
with
-
stacklets [f]
(
with
-
stacklets
(f)))
(defprotocol IThreadPool
(
-
execute [this work
-
fn]))
;; Super basic Thread Pool, yes, this should be improved
(deftype ThreadPool []
IThreadPool
(
-
execute [this work
-
fn]
(
-
thread (fn [] (work
-
fn)))))
(
def
basic
-
thread
-
pool (
-
>
ThreadPool))
(defn
-
run
-
in
-
other
-
thread [work
-
fn]
(
-
execute basic
-
thread
-
pool work
-
fn))
(defn
apply
-
blocking [f
&
args]
(call
-
cc (fn [k]
(
-
run
-
in
-
other
-
thread
(fn []
(let [result (
apply
f args)]
(
-
run
-
later (fn [] (run
-
and
-
process k result)))))))))
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