No longer exposing new arity in thread-call

src/main/clojure/clojure/core/async.clj

@@ -30,7 +30,7 @@ to catch and handle."
             clojure.core.async.impl.go ;; TODO: make conditional
             [clojure.core.async.impl.mutex :as mutex]
             [clojure.core.async.impl.concurrent :as conc]
-            )
+            [clojure.core.async.impl.exec.threadpool :as threadp])
   (:import [java.util.concurrent.atomic AtomicLong]
            [java.util.concurrent.locks Lock]
            [java.util.concurrent Executors Executor ThreadLocalRandom ExecutorService]
@@ -462,45 +462,41 @@ to catch and handle."
   [& body]
   (#'clojure.core.async.impl.go/go-impl &env body))
 
-(defonce ^ExecutorService mixed-executor
-  (Executors/newCachedThreadPool (conc/counted-thread-factory "async-mixed-%d" true)))
-
-(defonce ^ExecutorService io-executor
-  (Executors/newCachedThreadPool (conc/counted-thread-factory "async-io-%d" true)))
-
-(defonce ^ExecutorService compute-executor
-  (Executors/newCachedThreadPool (conc/counted-thread-factory "async-compute-%d" true)))
+(defn- best-fit-thread-call
+  [f exec]
+  (let [c (chan 1)
+        ^ExecutorService e (case exec
+                             :compute threadp/compute-executor
+                             :io threadp/io-executor
+                             threadp/mixed-executor)]
+    (let [binds (Var/getThreadBindingFrame)]
+      (.execute e
+                (fn []
+                  (Var/resetThreadBindingFrame binds)
+                  (try
+                    (let [ret (f)]
+                      (when-not (nil? ret)
+                        (>!! c ret)))
+                    (finally
+                      (close! c))))))
+    c))
 
 (defn thread-call
   "Executes f in another thread, returning immediately to the calling
   thread. Returns a channel which will receive the result of calling
-  f when completed, then close."
-  ([f] (thread-call f :mixed))
-  ([f exec]
-   (let [c (chan 1)
-         ^ExecutorService e (case exec
-                              :compute compute-executor
-                              :io io-executor
-                              mixed-executor)]
-     (let [binds (Var/getThreadBindingFrame)]
-       (.execute e
-                 (fn []
-                   (Var/resetThreadBindingFrame binds)
-                   (try
-                     (let [ret (f)]
-                       (when-not (nil? ret)
-                         (>!! c ret)))
-                     (finally
-                       (close! c))))))
-     c)))
+  f when completed, then close. exec is a keyword that describes the
+  nature of f's workload, one of :mixed (default) :io or :compute
+  whereby core.async may be able to choose a best fit thread type."
+  [f]
+  (best-fit-thread-call f :mixed))
 
 (defmacro io-thread
   "Executes the body in a thread intended for blocking I/O workloads,
   returning immediately to the calling thread. The body must not do
   extended computation (if so, use 'thread' instead). Returns a channel
   which will receive the result of the body when completed, then close."
   [& body]
-  `(thread-call (^:once fn* [] ~@body) :io))
+  `(#'best-fit-thread-call (^:once fn* [] ~@body) :io))
 
 (defmacro thread
   "Executes the body in another thread, returning immediately to the

src/main/clojure/clojure/core/async/impl/concurrent.clj

@@ -7,8 +7,9 @@
 ;;   You must not remove this notice, or any other, from this software.
 
 (ns ^{:skip-wiki true}
-  clojure.core.async.impl.concurrent
-  (:import [java.util.concurrent ThreadFactory]))
+    clojure.core.async.impl.concurrent
+  (:import [java.util.concurrent ThreadFactory Executors ExecutorService]
+           [clojure.lang Var]))
 
 (set! *warn-on-reflection* true)
 

src/main/clojure/clojure/core/async/impl/exec/threadpool.clj

@@ -9,7 +9,7 @@
 (ns clojure.core.async.impl.exec.threadpool
   (:require [clojure.core.async.impl.protocols :as impl]
             [clojure.core.async.impl.concurrent :as conc])
-  (:import [java.util.concurrent Executors]))
+  (:import [java.util.concurrent Executors ExecutorService]))
 
 (set! *warn-on-reflection* true)
 
@@ -30,3 +30,12 @@
      (reify impl/Executor
        (impl/exec [_ r]
          (.execute executor-svc ^Runnable r))))))
+
+(defonce ^ExecutorService mixed-executor
+  (Executors/newCachedThreadPool (conc/counted-thread-factory "async-mixed-%d" true)))
+
+(defonce ^ExecutorService io-executor
+  (Executors/newCachedThreadPool (conc/counted-thread-factory "async-io-%d" true)))
+
+(defonce ^ExecutorService compute-executor
+  (Executors/newCachedThreadPool (conc/counted-thread-factory "async-compute-%d" true)))