3 files changed, 55 insertions, 0 deletions
diff --git a/examples/scala-js/library/src/main/scala/scala/scalajs/concurrent/JSExecutionContext.scala b/examples/scala-js/library/src/main/scala/scala/scalajs/concurrent/JSExecutionContext.scala
new file mode 100644
index 0000000..c159dcb
--- /dev/null
+++ b/examples/scala-js/library/src/main/scala/scala/scalajs/concurrent/JSExecutionContext.scala
@@ -0,0 +1,24 @@
+package scala.scalajs.concurrent
+
+import scala.concurrent.ExecutionContext
+
+/**
+ * Execution contexts for use in JavaScript
+ *
+ * Enables the use of Futures/Promises
+ * @author Tobias Schlatter
+ */
+object JSExecutionContext {
+
+  /** execution context that runs immediately. beware of stack growth! */
+  val runNow = RunNowExecutionContext
+  /** execution context that submits into the JavaScript runtime's
+    * task queue */
+  val queue  = QueueExecutionContext
+
+  object Implicits {
+    implicit val runNow: ExecutionContext = JSExecutionContext.runNow
+    implicit val queue:  ExecutionContext = JSExecutionContext.queue
+  }
+
+}
diff --git a/examples/scala-js/library/src/main/scala/scala/scalajs/concurrent/QueueExecutionContext.scala b/examples/scala-js/library/src/main/scala/scala/scalajs/concurrent/QueueExecutionContext.scala
new file mode 100644
index 0000000..1f2ee6f
--- /dev/null
+++ b/examples/scala-js/library/src/main/scala/scala/scalajs/concurrent/QueueExecutionContext.scala
@@ -0,0 +1,17 @@
+package scala.scalajs.concurrent
+
+import scala.concurrent.ExecutionContext
+import scalajs.js
+
+private[concurrent] object QueueExecutionContext extends ExecutionContext {
+
+  def execute(runnable: Runnable) = {
+    val lambda: js.Function = () =>
+      try { runnable.run() } catch { case t: Throwable => reportFailure(t) }
+    js.Dynamic.global.setTimeout(lambda, 0)
+  }
+
+  def reportFailure(t: Throwable) =
+    Console.err.println("Failure in async execution: " + t)
+
+}
diff --git a/examples/scala-js/library/src/main/scala/scala/scalajs/concurrent/RunNowExcecutionContext.scala b/examples/scala-js/library/src/main/scala/scala/scalajs/concurrent/RunNowExcecutionContext.scala
new file mode 100644
index 0000000..ba113b4
--- /dev/null
+++ b/examples/scala-js/library/src/main/scala/scala/scalajs/concurrent/RunNowExcecutionContext.scala
@@ -0,0 +1,14 @@
+package scala.scalajs.concurrent
+
+import scala.concurrent.ExecutionContext
+
+private[concurrent] object RunNowExecutionContext extends ExecutionContext {
+
+  def execute(runnable: Runnable) =
+    try   { runnable.run() }
+    catch { case t: Throwable => reportFailure(t) }
+
+  def reportFailure(t: Throwable) =
+    Console.err.println("Failure in async execution: " + t)
+
+}