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Diffstat (limited to 'src/library/scala/concurrent/BlockContext.scala')
| -rw-r--r-- | src/library/scala/concurrent/BlockContext.scala | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/src/library/scala/concurrent/BlockContext.scala b/src/library/scala/concurrent/BlockContext.scala index 747cc393c3..2b8ed4c7ca 100644 --- a/src/library/scala/concurrent/BlockContext.scala +++ b/src/library/scala/concurrent/BlockContext.scala @@ -41,7 +41,7 @@ package scala.concurrent trait BlockContext { /** Used internally by the framework; - * Designates (and eventually executes) a thunk which potentially blocks the calling `Thread`. + * Designates (and eventually executes) a thunk which potentially blocks the calling `java.lang.Thread`. * * Clients must use `scala.concurrent.blocking` or `scala.concurrent.Await` instead. */ @@ -53,9 +53,16 @@ object BlockContext { override def blockOn[T](thunk: =>T)(implicit permission: CanAwait): T = thunk } + /** + * @return the `BlockContext` that will be used if no other is found. + **/ + def defaultBlockContext: BlockContext = DefaultBlockContext + private val contextLocal = new ThreadLocal[BlockContext]() - /** Obtain the current thread's current `BlockContext`. */ + /** + @return the `BlockContext` that would be used for the current `java.lang.Thread` at this point + **/ def current: BlockContext = contextLocal.get match { case null => Thread.currentThread match { case ctx: BlockContext => ctx @@ -64,7 +71,9 @@ object BlockContext { case some => some } - /** Pushes a current `BlockContext` while executing `body`. */ + /** + * Installs a current `BlockContext` around executing `body`. + **/ def withBlockContext[T](blockContext: BlockContext)(body: => T): T = { val old = contextLocal.get // can be null try { |