Make task support implementations public.

1 files changed, 23 insertions, 3 deletions

diff --git a/src/library/scala/collection/parallel/TaskSupport.scala b/src/library/scala/collection/parallel/TaskSupport.scala
index fc99347316..59b75f523f 100644
--- a/src/library/scala/collection/parallel/TaskSupport.scala
+++ b/src/library/scala/collection/parallel/TaskSupport.scala
@@ -17,18 +17,38 @@ import scala.concurrent.ExecutionContext
 
 
 
+/** A trait implementing the scheduling of
+ *  a parallel collection operation.
+ *  
+ *  Task support objects handle how a task is split and
+ *  distributed across processors. A task support object can be
+ *  changed in a parallel collection after it has been created,
+ *  but only during a quiescent period, i.e. while there are no
+ *  concurrent invocations to parallel collection methods.
+ */
 trait TaskSupport extends Tasks
 
 
-private[collection] class ForkJoinTaskSupport(val environment: ForkJoinPool = ForkJoinTasks.defaultForkJoinPool)
+/** A task support that uses a fork join pool to schedule tasks */
+class ForkJoinTaskSupport(val environment: ForkJoinPool = ForkJoinTasks.defaultForkJoinPool)
 extends TaskSupport with AdaptiveWorkStealingForkJoinTasks
 
 
-private[collection] class ThreadPoolTaskSupport(val environment: ThreadPoolExecutor = ThreadPoolTasks.defaultThreadPool)
+/** A task support that uses a thread pool executor to schedule tasks */
+class ThreadPoolTaskSupport(val environment: ThreadPoolExecutor = ThreadPoolTasks.defaultThreadPool)
 extends TaskSupport with AdaptiveWorkStealingThreadPoolTasks
 
 
-private[collection] class ExecutionContextTaskSupport(val environment: ExecutionContext = scala.concurrent.executionContext)
+/** A task support that uses an execution context to schedule tasks.
+ *  
+ *  It can be used with the default execution context implementation in the `scala.concurrent` package.
+ *  It internally forwards the call to either a forkjoin based task support or a thread pool executor one,
+ *  depending on what the execution context uses.
+ *  
+ *  By default, parallel collections are parametrized with this task support object, so parallel collections
+ *  share the same execution context backend as the rest of the `scala.concurrent` package.
+ */
+class ExecutionContextTaskSupport(val environment: ExecutionContext = scala.concurrent.executionContext)
 extends TaskSupport with ExecutionContextTasks