diff options
| -rw-r--r-- | src/library/scala/concurrent/ExecutionContext.scala | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/library/scala/concurrent/ExecutionContext.scala b/src/library/scala/concurrent/ExecutionContext.scala index a55432fd71..a1e94c8876 100644 --- a/src/library/scala/concurrent/ExecutionContext.scala +++ b/src/library/scala/concurrent/ExecutionContext.scala @@ -14,8 +14,13 @@ import scala.annotation.implicitNotFound import scala.util.Try /** - * An `ExecutionContext` can execute program logic, typically but not - * necessarily on a thread pool. + * An `ExecutionContext` can execute program logic asynchronously, + * typically but not necessarily on a thread pool. + * + * A general purpose `ExecutionContext` must be asynchronous in executing + * any `Runnable` that is passed into its `execute`-method. A special purpose + * `ExecutionContext` may be synchronous but must only be passed to code that + * is explicitly safe to be run using a synchronously executing `ExecutionContext`. * * APIs such as `Future.onComplete` require you to provide a callback * and an implicit `ExecutionContext`. The implicit `ExecutionContext` |