improve the TaskGroup API

the TaskGroup now holds an Executor instead of passing it when calling
its spawn method

also, define a global executor `Executor<'static>` and use static
lifetime instead of a lifetime placeholder

This improvement simplify the code for spawning a new task. There is no
need to pass the executor around.

1 files changed, 7 insertions, 3 deletions

diff --git a/core/src/lib.rs b/core/src/lib.rs
index 83af888..fef7459 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -4,7 +4,7 @@ pub mod utils;
 /// A module containing async utilities that work with the `smol` async runtime.
 pub mod async_utils;
 
-/// Represents Karyons's Core Error.
+/// Represents karyons's Core Error.
 pub mod error;
 
 /// [`EventSys`](./event/struct.EventSys.html) Implementation
@@ -13,9 +13,13 @@ pub mod event;
 /// A simple publish-subscribe system.[`Read More`](./pubsub/struct.Publisher.html)
 pub mod pubsub;
 
-use error::Result;
 use smol::Executor as SmolEx;
 use std::sync::Arc;
 
-/// A wrapper for smol::Executor
+/// A pointer to an Executor
 pub type Executor<'a> = Arc<SmolEx<'a>>;
+
+/// A Global Executor
+pub type GlobalExecutor = Arc<SmolEx<'static>>;
+
+use error::Result;