refactor: deno_runtime crate (#8640)

This commit moves Deno JS runtime, ops, permissions and
inspector implementation to new "deno_runtime" crate located
in "runtime/" directory.

Details in "runtime/README.md".

Co-authored-by: Ryan Dahl <ry@tinyclouds.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/runtime/tokio_util.rs b/runtime/tokio_util.rs
new file mode 100644
index 000000000..b25a2994f
--- /dev/null
+++ b/runtime/tokio_util.rs
@@ -0,0 +1,25 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+pub fn create_basic_runtime() -> tokio::runtime::Runtime {
+  tokio::runtime::Builder::new()
+    .basic_scheduler()
+    .enable_io()
+    .enable_time()
+    // This limits the number of threads for blocking operations (like for
+    // synchronous fs ops) or CPU bound tasks like when we run dprint in
+    // parallel for deno fmt.
+    // The default value is 512, which is an unhelpfully large thread pool. We
+    // don't ever want to have more than a couple dozen threads.
+    .max_threads(32)
+    .build()
+    .unwrap()
+}
+
+// TODO(ry) rename to run_local ?
+pub fn run_basic<F, R>(future: F) -> R
+where
+  F: std::future::Future<Output = R>,
+{
+  let mut rt = create_basic_runtime();
+  rt.block_on(future)
+}