SI-7938 - parallel collections should use default ExecutionContext

Parallel collections now use `scala.concurrent.ExecutionContext`
by default.

The `ExecutionContextTaskSupport` is optimized to use the
`ForkJoinPool` underlying the `ExecutionContext` if possible.
Otherwise, a fallback `TaskSupport` that creates a reduction tree and
execute an operation through `Future`s is used.

1 files changed, 6 insertions, 2 deletions

diff --git a/test/files/scalacheck/parallel-collections/ParallelRangeCheck.scala b/test/files/scalacheck/parallel-collections/ParallelRangeCheck.scala
index 372d6b9fbd..f490d9490a 100644
--- a/test/files/scalacheck/parallel-collections/ParallelRangeCheck.scala
+++ b/test/files/scalacheck/parallel-collections/ParallelRangeCheck.scala
@@ -17,7 +17,7 @@ import scala.collection.parallel.ops._
 
 
 
-object ParallelRangeCheck extends ParallelSeqCheck[Int]("ParallelRange[Int]") with ops.IntSeqOperators {
+class ParallelRangeCheck(val tasksupport: TaskSupport) extends ParallelSeqCheck[Int]("ParallelRange[Int]") with ops.IntSeqOperators {
   // ForkJoinTasks.defaultForkJoinPool.setMaximumPoolSize(Runtime.getRuntime.availableProcessors * 2)
   // ForkJoinTasks.defaultForkJoinPool.setParallelism(Runtime.getRuntime.availableProcessors * 2)
 
@@ -38,9 +38,13 @@ object ParallelRangeCheck extends ParallelSeqCheck[Int]("ParallelRange[Int]") wi
   }
 
   def fromSeq(a: Seq[Int]) = a match {
-    case r: Range => ParRange(r.start, r.end, r.step, false)
+    case r: Range =>
+      val pr = ParRange(r.start, r.end, r.step, false)
+      pr.tasksupport = tasksupport
+      pr
     case _ =>
       val pa = new parallel.mutable.ParArray[Int](a.length)
+      pa.tasksupport = tasksupport
       for (i <- 0 until a.length) pa(i) = a(i)
       pa
   }