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, 4 insertions, 1 deletions

diff --git a/test/files/scalacheck/parallel-collections/ParallelCtrieCheck.scala b/test/files/scalacheck/parallel-collections/ParallelCtrieCheck.scala
index b952704af2..cf15afb3b9 100644
--- a/test/files/scalacheck/parallel-collections/ParallelCtrieCheck.scala
+++ b/test/files/scalacheck/parallel-collections/ParallelCtrieCheck.scala
@@ -25,6 +25,8 @@ abstract class ParallelConcurrentTrieMapCheck[K, V](tp: String) extends Parallel
 
   def hasStrictOrder = false
 
+  def tasksupport: TaskSupport
+
   def ofSize(vals: Seq[Gen[(K, V)]], sz: Int) = {
     val ct = new concurrent.TrieMap[K, V]
     val gen = vals(rnd.nextInt(vals.size))
@@ -34,6 +36,7 @@ abstract class ParallelConcurrentTrieMapCheck[K, V](tp: String) extends Parallel
 
   def fromTraversable(t: Traversable[(K, V)]) = {
     val pct = new ParTrieMap[K, V]
+    pct.tasksupport = tasksupport
     var i = 0
     for (kv <- t.toList) {
       pct += kv
@@ -45,7 +48,7 @@ abstract class ParallelConcurrentTrieMapCheck[K, V](tp: String) extends Parallel
 }
 
 
-object IntIntParallelConcurrentTrieMapCheck extends ParallelConcurrentTrieMapCheck[Int, Int]("Int, Int")
+class IntIntParallelConcurrentTrieMapCheck(val tasksupport: TaskSupport) extends ParallelConcurrentTrieMapCheck[Int, Int]("Int, Int")
 with PairOperators[Int, Int]
 with PairValues[Int, Int]
 {