refactor(core): bake single-thread assumptions into spawn/spawn_blocking (#19056)

Partially supersedes #19016.

This migrates `spawn` and `spawn_blocking` to `deno_core`, and removes
the requirement for `spawn` tasks to be `Send` given our single-threaded
executor.

While we don't need to technically do anything w/`spawn_blocking`, this
allows us to have a single `JoinHandle` type that works for both cases,
and allows us to more easily experiment with alternative
`spawn_blocking` implementations that do not require tokio (ie: rayon).

Async ops (+~35%):

Before: 

```
time 1310 ms rate 763358
time 1267 ms rate 789265
time 1259 ms rate 794281
time 1266 ms rate 789889
```

After:

```
time 956 ms rate 1046025
time 954 ms rate 1048218
time 924 ms rate 1082251
time 920 ms rate 1086956
```

HTTP serve (+~4.4%):

Before:

```
Running 10s test @ http://localhost:4500
  2 threads and 10 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    68.78us   19.77us   1.43ms   86.84%
    Req/Sec    68.78k     5.00k   73.84k    91.58%
  1381833 requests in 10.10s, 167.36MB read
Requests/sec: 136823.29
Transfer/sec:     16.57MB
```

After:

```
Running 10s test @ http://localhost:4500
  2 threads and 10 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    63.12us   17.43us   1.11ms   85.13%
    Req/Sec    71.82k     3.71k   77.02k    79.21%
  1443195 requests in 10.10s, 174.79MB read
Requests/sec: 142921.99
Transfer/sec:     17.31MB
```

Suggested-By: alice@ryhl.io
Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>

21 files changed, 204 insertions, 202 deletions

diff --git a/cli/cache/cache_db.rs b/cli/cache/cache_db.rs
index 90840de1a..e05ecd962 100644
--- a/cli/cache/cache_db.rs
+++ b/cli/cache/cache_db.rs
@@ -3,6 +3,7 @@
 use deno_core::error::AnyError;
 use deno_core::parking_lot::Mutex;
 use deno_core::parking_lot::MutexGuard;
+use deno_core::task::spawn_blocking;
 use deno_runtime::deno_webstorage::rusqlite;
 use deno_runtime::deno_webstorage::rusqlite::Connection;
 use deno_runtime::deno_webstorage::rusqlite::OptionalExtension;
@@ -95,7 +96,7 @@ impl Drop for CacheDB {
       // Hand off SQLite connection to another thread to do the surprisingly expensive cleanup
       let inner = inner.into_inner().into_inner();
       if let Some(conn) = inner {
-        tokio::task::spawn_blocking(move || {
+        spawn_blocking(move || {
           drop(conn);
           log::trace!(
             "Cleaned up SQLite connection at {}",
@@ -168,7 +169,7 @@ impl CacheDB {
   fn spawn_eager_init_thread(&self) {
     let clone = self.clone();
     debug_assert!(tokio::runtime::Handle::try_current().is_ok());
-    tokio::task::spawn_blocking(move || {
+    spawn_blocking(move || {
       let lock = clone.conn.lock();
       clone.initialize(&lock);
     });
diff --git a/cli/cache/incremental.rs b/cli/cache/incremental.rs
index deb30cdd1..c50b876fa 100644
--- a/cli/cache/incremental.rs
+++ b/cli/cache/incremental.rs
@@ -7,9 +7,10 @@ use std::path::PathBuf;
 use deno_core::error::AnyError;
 use deno_core::parking_lot::Mutex;
 use deno_core::serde_json;
+use deno_core::task::spawn;
+use deno_core::task::JoinHandle;
 use deno_runtime::deno_webstorage::rusqlite::params;
 use serde::Serialize;
-use tokio::task::JoinHandle;
 
 use super::cache_db::CacheDB;
 use super::cache_db::CacheDBConfiguration;
@@ -93,7 +94,7 @@ impl IncrementalCacheInner {
       tokio::sync::mpsc::unbounded_channel::<ReceiverMessage>();
 
     // sqlite isn't `Sync`, so we do all the updating on a dedicated task
-    let handle = tokio::task::spawn(async move {
+    let handle = spawn(async move {
       while let Some(message) = receiver.recv().await {
         match message {
           ReceiverMessage::Update(path, hash) => {
diff --git a/cli/lsp/client.rs b/cli/lsp/client.rs
index d24d4c2a9..4923a4585 100644
--- a/cli/lsp/client.rs
+++ b/cli/lsp/client.rs
@@ -8,6 +8,7 @@ use deno_core::anyhow::bail;
 use deno_core::error::AnyError;
 use deno_core::serde_json;
 use deno_core::serde_json::Value;
+use deno_core::task::spawn;
 use tower_lsp::lsp_types as lsp;
 use tower_lsp::lsp_types::ConfigurationItem;
 
@@ -56,7 +57,7 @@ impl Client {
   ) {
     // do on a task in case the caller currently is in the lsp lock
     let client = self.0.clone();
-    tokio::task::spawn(async move {
+    spawn(async move {
       client.send_registry_state_notification(params).await;
     });
   }
@@ -64,7 +65,7 @@ impl Client {
   pub fn send_test_notification(&self, params: TestingNotification) {
     // do on a task in case the caller currently is in the lsp lock
     let client = self.0.clone();
-    tokio::task::spawn(async move {
+    spawn(async move {
       client.send_test_notification(params).await;
     });
   }
@@ -77,7 +78,7 @@ impl Client {
     // do on a task in case the caller currently is in the lsp lock
     let client = self.0.clone();
     let message = message.to_string();
-    tokio::task::spawn(async move {
+    spawn(async move {
       client.show_message(message_type, message).await;
     });
   }
diff --git a/cli/lsp/diagnostics.rs b/cli/lsp/diagnostics.rs
index 0f96a498b..7b5a30a0e 100644
--- a/cli/lsp/diagnostics.rs
+++ b/cli/lsp/diagnostics.rs
@@ -25,6 +25,8 @@ use deno_core::resolve_url;
 use deno_core::serde::Deserialize;
 use deno_core::serde_json;
 use deno_core::serde_json::json;
+use deno_core::task::spawn;
+use deno_core::task::JoinHandle;
 use deno_core::ModuleSpecifier;
 use deno_graph::Resolution;
 use deno_graph::ResolutionError;
@@ -197,9 +199,9 @@ impl DiagnosticsServer {
 
       runtime.block_on(async {
         let mut token = CancellationToken::new();
-        let mut ts_handle: Option<tokio::task::JoinHandle<()>> = None;
-        let mut lint_handle: Option<tokio::task::JoinHandle<()>> = None;
-        let mut deps_handle: Option<tokio::task::JoinHandle<()>> = None;
+        let mut ts_handle: Option<JoinHandle<()>> = None;
+        let mut lint_handle: Option<JoinHandle<()>> = None;
+        let mut deps_handle: Option<JoinHandle<()>> = None;
         let diagnostics_publisher = DiagnosticsPublisher::new(client.clone());
 
         loop {
@@ -213,7 +215,7 @@ impl DiagnosticsServer {
               diagnostics_publisher.clear().await;
 
               let previous_ts_handle = ts_handle.take();
-              ts_handle = Some(tokio::spawn({
+              ts_handle = Some(spawn({
                 let performance = performance.clone();
                 let diagnostics_publisher = diagnostics_publisher.clone();
                 let ts_server = ts_server.clone();
@@ -265,7 +267,7 @@ impl DiagnosticsServer {
               }));
 
               let previous_deps_handle = deps_handle.take();
-              deps_handle = Some(tokio::spawn({
+              deps_handle = Some(spawn({
                 let performance = performance.clone();
                 let diagnostics_publisher = diagnostics_publisher.clone();
                 let token = token.clone();
@@ -293,7 +295,7 @@ impl DiagnosticsServer {
               }));
 
               let previous_lint_handle = lint_handle.take();
-              lint_handle = Some(tokio::spawn({
+              lint_handle = Some(spawn({
                 let performance = performance.clone();
                 let diagnostics_publisher = diagnostics_publisher.clone();
                 let token = token.clone();
diff --git a/cli/lsp/language_server.rs b/cli/lsp/language_server.rs
index de5cd6f09..e76ea0040 100644
--- a/cli/lsp/language_server.rs
+++ b/cli/lsp/language_server.rs
@@ -8,6 +8,7 @@ use deno_core::resolve_url;
 use deno_core::serde_json;
 use deno_core::serde_json::json;
 use deno_core::serde_json::Value;
+use deno_core::task::spawn;
 use deno_core::ModuleSpecifier;
 use deno_runtime::deno_fs;
 use deno_runtime::deno_node::NodeResolver;
@@ -240,7 +241,7 @@ impl LanguageServer {
           let cli_options = result.cli_options;
           let roots = result.roots;
           let open_docs = result.open_docs;
-          let handle = tokio::task::spawn_local(async move {
+          let handle = spawn(async move {
             create_graph_for_caching(cli_options, roots, open_docs).await
           });
           if let Err(err) = handle.await.unwrap() {
diff --git a/cli/lsp/parent_process_checker.rs b/cli/lsp/parent_process_checker.rs
index 4cc3bcef3..f83543c04 100644
--- a/cli/lsp/parent_process_checker.rs
+++ b/cli/lsp/parent_process_checker.rs
@@ -1,5 +1,6 @@
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
 
+use deno_core::task::spawn;
 use tokio::time::sleep;
 use tokio::time::Duration;
 
@@ -7,7 +8,7 @@ use tokio::time::Duration;
 /// provided process id. Once that process no longer exists
 /// it will terminate the current process.
 pub fn start(parent_process_id: u32) {
-  tokio::task::spawn(async move {
+  spawn(async move {
     loop {
       sleep(Duration::from_secs(30)).await;
 
diff --git a/cli/lsp/testing/execution.rs b/cli/lsp/testing/execution.rs
index 4834cd0c9..ce8c8b5ac 100644
--- a/cli/lsp/testing/execution.rs
+++ b/cli/lsp/testing/execution.rs
@@ -24,9 +24,11 @@ use deno_core::futures::stream;
 use deno_core::futures::StreamExt;
 use deno_core::parking_lot::Mutex;
 use deno_core::parking_lot::RwLock;
+use deno_core::task::spawn;
+use deno_core::task::spawn_blocking;
 use deno_core::ModuleSpecifier;
 use deno_runtime::permissions::Permissions;
-use deno_runtime::tokio_util::run_local;
+use deno_runtime::tokio_util::create_and_run_current_thread;
 use indexmap::IndexMap;
 use std::collections::HashMap;
 use std::collections::HashSet;
@@ -284,7 +286,7 @@ impl TestRun {
       };
       let token = self.token.clone();
 
-      tokio::task::spawn_blocking(move || {
+      spawn_blocking(move || {
         if fail_fast_tracker.should_stop() {
           return Ok(());
         }
@@ -292,13 +294,13 @@ impl TestRun {
         let file_result = if token.is_cancelled() {
           Ok(())
         } else {
-          run_local(test::test_specifier(
-            &worker_factory,
+          create_and_run_current_thread(test::test_specifier(
+            worker_factory,
             permissions,
             specifier,
             sender.clone(),
             fail_fast_tracker,
-            &test::TestSpecifierOptions {
+            test::TestSpecifierOptions {
               filter,
               shuffle: None,
               trace_ops: false,
@@ -331,7 +333,7 @@ impl TestRun {
     ));
 
     let handler = {
-      tokio::task::spawn(async move {
+      spawn(async move {
         let earlier = Instant::now();
         let mut summary = test::TestSummary::new();
         let mut used_only = false;
diff --git a/cli/main.rs b/cli/main.rs
index 75425cf10..023d5a208 100644
--- a/cli/main.rs
+++ b/cli/main.rs
@@ -46,7 +46,7 @@ use deno_core::error::AnyError;
 use deno_core::error::JsError;
 use deno_runtime::colors;
 use deno_runtime::fmt_errors::format_js_error;
-use deno_runtime::tokio_util::run_local;
+use deno_runtime::tokio_util::create_and_run_current_thread;
 use factory::CliFactory;
 use std::env;
 use std::env::current_exe;
@@ -294,7 +294,7 @@ pub fn main() {
     run_subcommand(flags).await
   };
 
-  let exit_code = unwrap_or_exit(run_local(future));
+  let exit_code = unwrap_or_exit(create_and_run_current_thread(future));
 
   std::process::exit(exit_code);
 }
diff --git a/cli/npm/resolvers/common.rs b/cli/npm/resolvers/common.rs
index fc040a7cc..c91b206cf 100644
--- a/cli/npm/resolvers/common.rs
+++ b/cli/npm/resolvers/common.rs
@@ -9,6 +9,7 @@ use async_trait::async_trait;
 use deno_ast::ModuleSpecifier;
 use deno_core::error::AnyError;
 use deno_core::futures;
+use deno_core::task::spawn;
 use deno_core::url::Url;
 use deno_npm::NpmPackageId;
 use deno_npm::NpmResolutionPackage;
@@ -71,7 +72,7 @@ pub async fn cache_packages(
     assert_eq!(package.copy_index, 0); // the caller should not provide any of these
     let cache = cache.clone();
     let registry_url = registry_url.clone();
-    let handle = tokio::task::spawn(async move {
+    let handle = spawn(async move {
       cache
         .ensure_package(&package.pkg_id.nv, &package.dist, &registry_url)
         .await
diff --git a/cli/npm/resolvers/local.rs b/cli/npm/resolvers/local.rs
index cd1dc3671..b2ad08357 100644
--- a/cli/npm/resolvers/local.rs
+++ b/cli/npm/resolvers/local.rs
@@ -18,6 +18,8 @@ use deno_ast::ModuleSpecifier;
 use deno_core::anyhow::bail;
 use deno_core::anyhow::Context;
 use deno_core::error::AnyError;
+use deno_core::task::spawn;
+use deno_core::task::JoinHandle;
 use deno_core::url::Url;
 use deno_npm::resolution::NpmResolutionSnapshot;
 use deno_npm::NpmPackageCacheFolderId;
@@ -27,7 +29,6 @@ use deno_runtime::deno_fs;
 use deno_runtime::deno_node::NodePermissions;
 use deno_runtime::deno_node::NodeResolutionMode;
 use deno_runtime::deno_node::PackageJson;
-use tokio::task::JoinHandle;
 
 use crate::npm::cache::mixed_case_package_name_encode;
 use crate::npm::cache::should_sync_download;
@@ -277,7 +278,7 @@ async fn sync_resolution_with_fs(
       let cache = cache.clone();
       let registry_url = registry_url.clone();
       let package = package.clone();
-      let handle = tokio::task::spawn(async move {
+      let handle = spawn(async move {
         cache
           .ensure_package(&package.pkg_id.nv, &package.dist, &registry_url)
           .await?;
diff --git a/cli/tests/integration/cert_tests.rs b/cli/tests/integration/cert_tests.rs
index d3da6d75a..b04f2d35e 100644
--- a/cli/tests/integration/cert_tests.rs
+++ b/cli/tests/integration/cert_tests.rs
@@ -11,7 +11,6 @@ use std::process::Command;
 use std::sync::Arc;
 use test_util as util;
 use test_util::TempDir;
-use tokio::task::LocalSet;
 use util::TestContext;
 
 itest_flaky!(cafile_url_imports {
@@ -219,113 +218,99 @@ fn cafile_bundle_remote_exports() {
 
 #[tokio::test]
 async fn listen_tls_alpn() {
-  // TLS streams require the presence of an ambient local task set to gracefully
-  // close dropped connections in the background.
-  LocalSet::new()
-    .run_until(async {
-      let mut child = util::deno_cmd()
-        .current_dir(util::testdata_path())
-        .arg("run")
-        .arg("--unstable")
-        .arg("--quiet")
-        .arg("--allow-net")
-        .arg("--allow-read")
-        .arg("./cert/listen_tls_alpn.ts")
-        .arg("4504")
-        .stdout(std::process::Stdio::piped())
-        .spawn()
-        .unwrap();
-      let stdout = child.stdout.as_mut().unwrap();
-      let mut msg = [0; 5];
-      let read = stdout.read(&mut msg).unwrap();
-      assert_eq!(read, 5);
-      assert_eq!(&msg, b"READY");
-
-      let mut reader = &mut BufReader::new(Cursor::new(include_bytes!(
-        "../testdata/tls/RootCA.crt"
-      )));
-      let certs = rustls_pemfile::certs(&mut reader).unwrap();
-      let mut root_store = rustls::RootCertStore::empty();
-      root_store.add_parsable_certificates(&certs);
-      let mut cfg = rustls::ClientConfig::builder()
-        .with_safe_defaults()
-        .with_root_certificates(root_store)
-        .with_no_client_auth();
-      cfg.alpn_protocols.push(b"foobar".to_vec());
-      let cfg = Arc::new(cfg);
-
-      let hostname = rustls::ServerName::try_from("localhost").unwrap();
-
-      let tcp_stream = tokio::net::TcpStream::connect("localhost:4504")
-        .await
-        .unwrap();
-      let mut tls_stream =
-        TlsStream::new_client_side(tcp_stream, cfg, hostname);
-
-      tls_stream.handshake().await.unwrap();
-
-      let (_, rustls_connection) = tls_stream.get_ref();
-      let alpn = rustls_connection.alpn_protocol().unwrap();
-      assert_eq!(alpn, b"foobar");
-
-      let status = child.wait().unwrap();
-      assert!(status.success());
-    })
-    .await;
+  let mut child = util::deno_cmd()
+    .current_dir(util::testdata_path())
+    .arg("run")
+    .arg("--unstable")
+    .arg("--quiet")
+    .arg("--allow-net")
+    .arg("--allow-read")
+    .arg("./cert/listen_tls_alpn.ts")
+    .arg("4504")
+    .stdout(std::process::Stdio::piped())
+    .spawn()
+    .unwrap();
+  let stdout = child.stdout.as_mut().unwrap();
+  let mut msg = [0; 5];
+  let read = stdout.read(&mut msg).unwrap();
+  assert_eq!(read, 5);
+  assert_eq!(&msg, b"READY");
+
+  let mut reader = &mut BufReader::new(Cursor::new(include_bytes!(
+    "../testdata/tls/RootCA.crt"
+  )));
+  let certs = rustls_pemfile::certs(&mut reader).unwrap();
+  let mut root_store = rustls::RootCertStore::empty();
+  root_store.add_parsable_certificates(&certs);
+  let mut cfg = rustls::ClientConfig::builder()
+    .with_safe_defaults()
+    .with_root_certificates(root_store)
+    .with_no_client_auth();
+  cfg.alpn_protocols.push(b"foobar".to_vec());
+  let cfg = Arc::new(cfg);
+
+  let hostname = rustls::ServerName::try_from("localhost").unwrap();
+
+  let tcp_stream = tokio::net::TcpStream::connect("localhost:4504")
+    .await
+    .unwrap();
+  let mut tls_stream = TlsStream::new_client_side(tcp_stream, cfg, hostname);
+
+  tls_stream.handshake().await.unwrap();
+
+  let (_, rustls_connection) = tls_stream.get_ref();
+  let alpn = rustls_connection.alpn_protocol().unwrap();
+  assert_eq!(alpn, b"foobar");
+
+  let status = child.wait().unwrap();
+  assert!(status.success());
 }
 
 #[tokio::test]
 async fn listen_tls_alpn_fail() {
-  // TLS streams require the presence of an ambient local task set to gracefully
-  // close dropped connections in the background.
-  LocalSet::new()
-    .run_until(async {
-      let mut child = util::deno_cmd()
-        .current_dir(util::testdata_path())
-        .arg("run")
-        .arg("--unstable")
-        .arg("--quiet")
-        .arg("--allow-net")
-        .arg("--allow-read")
-        .arg("./cert/listen_tls_alpn_fail.ts")
-        .arg("4505")
-        .stdout(std::process::Stdio::piped())
-        .spawn()
-        .unwrap();
-      let stdout = child.stdout.as_mut().unwrap();
-      let mut msg = [0; 5];
-      let read = stdout.read(&mut msg).unwrap();
-      assert_eq!(read, 5);
-      assert_eq!(&msg, b"READY");
-
-      let mut reader = &mut BufReader::new(Cursor::new(include_bytes!(
-        "../testdata/tls/RootCA.crt"
-      )));
-      let certs = rustls_pemfile::certs(&mut reader).unwrap();
-      let mut root_store = rustls::RootCertStore::empty();
-      root_store.add_parsable_certificates(&certs);
-      let mut cfg = rustls::ClientConfig::builder()
-        .with_safe_defaults()
-        .with_root_certificates(root_store)
-        .with_no_client_auth();
-      cfg.alpn_protocols.push(b"boofar".to_vec());
-      let cfg = Arc::new(cfg);
-
-      let hostname = rustls::ServerName::try_from("localhost").unwrap();
-
-      let tcp_stream = tokio::net::TcpStream::connect("localhost:4505")
-        .await
-        .unwrap();
-      let mut tls_stream =
-        TlsStream::new_client_side(tcp_stream, cfg, hostname);
-
-      tls_stream.handshake().await.unwrap_err();
-
-      let (_, rustls_connection) = tls_stream.get_ref();
-      assert!(rustls_connection.alpn_protocol().is_none());
-
-      let status = child.wait().unwrap();
-      assert!(status.success());
-    })
-    .await;
+  let mut child = util::deno_cmd()
+    .current_dir(util::testdata_path())
+    .arg("run")
+    .arg("--unstable")
+    .arg("--quiet")
+    .arg("--allow-net")
+    .arg("--allow-read")
+    .arg("./cert/listen_tls_alpn_fail.ts")
+    .arg("4505")
+    .stdout(std::process::Stdio::piped())
+    .spawn()
+    .unwrap();
+  let stdout = child.stdout.as_mut().unwrap();
+  let mut msg = [0; 5];
+  let read = stdout.read(&mut msg).unwrap();
+  assert_eq!(read, 5);
+  assert_eq!(&msg, b"READY");
+
+  let mut reader = &mut BufReader::new(Cursor::new(include_bytes!(
+    "../testdata/tls/RootCA.crt"
+  )));
+  let certs = rustls_pemfile::certs(&mut reader).unwrap();
+  let mut root_store = rustls::RootCertStore::empty();
+  root_store.add_parsable_certificates(&certs);
+  let mut cfg = rustls::ClientConfig::builder()
+    .with_safe_defaults()
+    .with_root_certificates(root_store)
+    .with_no_client_auth();
+  cfg.alpn_protocols.push(b"boofar".to_vec());
+  let cfg = Arc::new(cfg);
+
+  let hostname = rustls::ServerName::try_from("localhost").unwrap();
+
+  let tcp_stream = tokio::net::TcpStream::connect("localhost:4505")
+    .await
+    .unwrap();
+  let mut tls_stream = TlsStream::new_client_side(tcp_stream, cfg, hostname);
+
+  tls_stream.handshake().await.unwrap_err();
+
+  let (_, rustls_connection) = tls_stream.get_ref();
+  assert!(rustls_connection.alpn_protocol().is_none());
+
+  let status = child.wait().unwrap();
+  assert!(status.success());
 }
diff --git a/cli/tests/integration/inspector_tests.rs b/cli/tests/integration/inspector_tests.rs
index cf66c4adc..8fa9ec85c 100644
--- a/cli/tests/integration/inspector_tests.rs
+++ b/cli/tests/integration/inspector_tests.rs
@@ -29,7 +29,7 @@ where
   Fut::Output: Send + 'static,
 {
   fn execute(&self, fut: Fut) {
-    tokio::task::spawn(fut);
+    deno_core::task::spawn(fut);
   }
 }
 
diff --git a/cli/tests/integration/run_tests.rs b/cli/tests/integration/run_tests.rs
index e6ea85da4..bc717351a 100644
--- a/cli/tests/integration/run_tests.rs
+++ b/cli/tests/integration/run_tests.rs
@@ -9,7 +9,6 @@ use std::process::Stdio;
 use std::time::Duration;
 use test_util as util;
 use test_util::TempDir;
-use tokio::task::LocalSet;
 use trust_dns_client::serialize::txt::Lexer;
 use trust_dns_client::serialize::txt::Parser;
 use util::assert_contains;
@@ -3886,50 +3885,44 @@ async fn test_resolve_dns() {
 
 #[tokio::test]
 async fn http2_request_url() {
-  // TLS streams require the presence of an ambient local task set to gracefully
-  // close dropped connections in the background.
-  LocalSet::new()
-    .run_until(async {
-      let mut child = util::deno_cmd()
-        .current_dir(util::testdata_path())
-        .arg("run")
-        .arg("--unstable")
-        .arg("--quiet")
-        .arg("--allow-net")
-        .arg("--allow-read")
-        .arg("./run/http2_request_url.ts")
-        .arg("4506")
-        .stdout(std::process::Stdio::piped())
-        .spawn()
-        .unwrap();
-      let stdout = child.stdout.as_mut().unwrap();
-      let mut buffer = [0; 5];
-      let read = stdout.read(&mut buffer).unwrap();
-      assert_eq!(read, 5);
-      let msg = std::str::from_utf8(&buffer).unwrap();
-      assert_eq!(msg, "READY");
-
-      let cert = reqwest::Certificate::from_pem(include_bytes!(
-        "../testdata/tls/RootCA.crt"
-      ))
-      .unwrap();
+  let mut child = util::deno_cmd()
+    .current_dir(util::testdata_path())
+    .arg("run")
+    .arg("--unstable")
+    .arg("--quiet")
+    .arg("--allow-net")
+    .arg("--allow-read")
+    .arg("./run/http2_request_url.ts")
+    .arg("4506")
+    .stdout(std::process::Stdio::piped())
+    .spawn()
+    .unwrap();
+  let stdout = child.stdout.as_mut().unwrap();
+  let mut buffer = [0; 5];
+  let read = stdout.read(&mut buffer).unwrap();
+  assert_eq!(read, 5);
+  let msg = std::str::from_utf8(&buffer).unwrap();
+  assert_eq!(msg, "READY");
 
-      let client = reqwest::Client::builder()
-        .add_root_certificate(cert)
-        .http2_prior_knowledge()
-        .build()
-        .unwrap();
+  let cert = reqwest::Certificate::from_pem(include_bytes!(
+    "../testdata/tls/RootCA.crt"
+  ))
+  .unwrap();
+
+  let client = reqwest::Client::builder()
+    .add_root_certificate(cert)
+    .http2_prior_knowledge()
+    .build()
+    .unwrap();
 
-      let res = client.get("http://127.0.0.1:4506").send().await.unwrap();
-      assert_eq!(200, res.status());
+  let res = client.get("http://127.0.0.1:4506").send().await.unwrap();
+  assert_eq!(200, res.status());
 
-      let body = res.text().await.unwrap();
-      assert_eq!(body, "http://127.0.0.1:4506/");
+  let body = res.text().await.unwrap();
+  assert_eq!(body, "http://127.0.0.1:4506/");
 
-      child.kill().unwrap();
-      child.wait().unwrap();
-    })
-    .await;
+  child.kill().unwrap();
+  child.wait().unwrap();
 }
 
 #[cfg(not(windows))]
@@ -4173,7 +4166,7 @@ where
   Fut::Output: Send + 'static,
 {
   fn execute(&self, fut: Fut) {
-    tokio::task::spawn(fut);
+    deno_core::task::spawn(fut);
   }
 }
 
diff --git a/cli/tools/bench.rs b/cli/tools/bench.rs
index 3d5f99aba..107fd2b9b 100644
--- a/cli/tools/bench.rs
+++ b/cli/tools/bench.rs
@@ -27,11 +27,13 @@ use deno_core::futures::FutureExt;
 use deno_core::futures::StreamExt;
 use deno_core::located_script_name;
 use deno_core::serde_v8;
+use deno_core::task::spawn;
+use deno_core::task::spawn_blocking;
 use deno_core::v8;
 use deno_core::ModuleSpecifier;
 use deno_runtime::permissions::Permissions;
 use deno_runtime::permissions::PermissionsContainer;
-use deno_runtime::tokio_util::run_local;
+use deno_runtime::tokio_util::create_and_run_current_thread;
 use indexmap::IndexMap;
 use indexmap::IndexSet;
 use log::Level;
@@ -436,7 +438,7 @@ async fn check_specifiers(
 
 /// Run a single specifier as an executable bench module.
 async fn bench_specifier(
-  worker_factory: &CliMainWorkerFactory,
+  worker_factory: Arc<CliMainWorkerFactory>,
   permissions: Permissions,
   specifier: ModuleSpecifier,
   sender: UnboundedSender<BenchEvent>,
@@ -522,15 +524,15 @@ async fn bench_specifiers(
     let specifier = specifier;
     let sender = sender.clone();
     let options = option_for_handles.clone();
-    tokio::task::spawn_blocking(move || {
+    spawn_blocking(move || {
       let future = bench_specifier(
-        &worker_factory,
+        worker_factory,
         permissions,
         specifier,
         sender,
         options.filter,
       );
-      run_local(future)
+      create_and_run_current_thread(future)
     })
   });
 
@@ -539,7 +541,7 @@ async fn bench_specifiers(
     .collect::<Vec<Result<Result<(), AnyError>, tokio::task::JoinError>>>();
 
   let handler = {
-    tokio::task::spawn(async move {
+    spawn(async move {
       let mut used_only = false;
       let mut report = BenchReport::new();
       let mut reporter =
diff --git a/cli/tools/fmt.rs b/cli/tools/fmt.rs
index 70d2bd639..f2fec9302 100644
--- a/cli/tools/fmt.rs
+++ b/cli/tools/fmt.rs
@@ -28,6 +28,7 @@ use deno_core::error::generic_error;
 use deno_core::error::AnyError;
 use deno_core::futures;
 use deno_core::parking_lot::Mutex;
+use deno_core::task::spawn_blocking;
 use log::debug;
 use log::info;
 use log::warn;
@@ -629,7 +630,7 @@ where
   let handles = file_paths.iter().map(|file_path| {
     let f = f.clone();
     let file_path = file_path.clone();
-    tokio::task::spawn_blocking(move || f(file_path))
+    spawn_blocking(move || f(file_path))
   });
   let join_results = futures::future::join_all(handles).await;
 
diff --git a/cli/tools/repl/mod.rs b/cli/tools/repl/mod.rs
index 9f4b58919..dfd9931b8 100644
--- a/cli/tools/repl/mod.rs
+++ b/cli/tools/repl/mod.rs
@@ -8,6 +8,7 @@ use crate::factory::CliFactory;
 use crate::file_fetcher::FileFetcher;
 use deno_core::error::AnyError;
 use deno_core::futures::StreamExt;
+use deno_core::task::spawn_blocking;
 use deno_runtime::permissions::Permissions;
 use deno_runtime::permissions::PermissionsContainer;
 use rustyline::error::ReadlineError;
@@ -32,7 +33,7 @@ async fn read_line_and_poll(
   editor: ReplEditor,
 ) -> Result<String, ReadlineError> {
   #![allow(clippy::await_holding_refcell_ref)]
-  let mut line_fut = tokio::task::spawn_blocking(move || editor.readline());
+  let mut line_fut = spawn_blocking(move || editor.readline());
   let mut poll_worker = true;
   let notifications_rc = repl_session.notifications.clone();
   let mut notifications = notifications_rc.borrow_mut();
diff --git a/cli/tools/task.rs b/cli/tools/task.rs
index bf972e2db..37a1aa1c9 100644
--- a/cli/tools/task.rs
+++ b/cli/tools/task.rs
@@ -21,6 +21,7 @@ use indexmap::IndexMap;
 use std::collections::HashMap;
 use std::path::PathBuf;
 use std::rc::Rc;
+use tokio::task::LocalSet;
 
 pub async fn execute_script(
   flags: Flags,
@@ -59,9 +60,10 @@ pub async fn execute_script(
     let seq_list = deno_task_shell::parser::parse(&script)
       .with_context(|| format!("Error parsing script '{task_name}'."))?;
     let env_vars = collect_env_vars();
-    let exit_code =
-      deno_task_shell::execute(seq_list, env_vars, &cwd, Default::default())
-        .await;
+    let local = LocalSet::new();
+    let future =
+      deno_task_shell::execute(seq_list, env_vars, &cwd, Default::default());
+    let exit_code = local.run_until(future).await;
     Ok(exit_code)
   } else if let Some(script) = package_json_scripts.get(task_name) {
     let package_json_deps_provider = factory.package_json_deps_provider();
@@ -109,8 +111,10 @@ pub async fn execute_script(
       .with_context(|| format!("Error parsing script '{task_name}'."))?;
     let npx_commands = resolve_npm_commands(npm_resolver, node_resolver)?;
     let env_vars = collect_env_vars();
-    let exit_code =
-      deno_task_shell::execute(seq_list, env_vars, &cwd, npx_commands).await;
+    let local = LocalSet::new();
+    let future =
+      deno_task_shell::execute(seq_list, env_vars, &cwd, npx_commands);
+    let exit_code = local.run_until(future).await;
     Ok(exit_code)
   } else {
     eprintln!("Task not found: {task_name}");
diff --git a/cli/tools/test.rs b/cli/tools/test.rs
index 50e220a46..f78e32539 100644
--- a/cli/tools/test.rs
+++ b/cli/tools/test.rs
@@ -34,6 +34,8 @@ use deno_core::futures::StreamExt;
 use deno_core::located_script_name;
 use deno_core::parking_lot::Mutex;
 use deno_core::serde_v8;
+use deno_core::task::spawn;
+use deno_core::task::spawn_blocking;
 use deno_core::url::Url;
 use deno_core::v8;
 use deno_core::ModuleSpecifier;
@@ -42,7 +44,7 @@ use deno_runtime::deno_io::StdioPipe;
 use deno_runtime::fmt_errors::format_js_error;
 use deno_runtime::permissions::Permissions;
 use deno_runtime::permissions::PermissionsContainer;
-use deno_runtime::tokio_util::run_local;
+use deno_runtime::tokio_util::create_and_run_current_thread;
 use indexmap::IndexMap;
 use indexmap::IndexSet;
 use log::Level;
@@ -916,12 +918,12 @@ pub fn format_test_error(js_error: &JsError) -> String {
 /// Test a single specifier as documentation containing test programs, an executable test module or
 /// both.
 pub async fn test_specifier(
-  worker_factory: &CliMainWorkerFactory,
+  worker_factory: Arc<CliMainWorkerFactory>,
   permissions: Permissions,
   specifier: ModuleSpecifier,
   mut sender: TestEventSender,
   fail_fast_tracker: FailFastTracker,
-  options: &TestSpecifierOptions,
+  options: TestSpecifierOptions,
 ) -> Result<(), AnyError> {
   if fail_fast_tracker.should_stop() {
     return Ok(());
@@ -1316,7 +1318,7 @@ async fn test_specifiers(
   let concurrent_jobs = options.concurrent_jobs;
 
   let sender_ = sender.downgrade();
-  let sigint_handler_handle = tokio::task::spawn(async move {
+  let sigint_handler_handle = spawn(async move {
     signal::ctrl_c().await.unwrap();
     sender_.upgrade().map(|s| s.send(TestEvent::Sigint).ok());
   });
@@ -1328,14 +1330,14 @@ async fn test_specifiers(
     let sender = sender.clone();
     let fail_fast_tracker = FailFastTracker::new(options.fail_fast);
     let specifier_options = options.specifier.clone();
-    tokio::task::spawn_blocking(move || {
-      run_local(test_specifier(
-        &worker_factory,
+    spawn_blocking(move || {
+      create_and_run_current_thread(test_specifier(
+        worker_factory,
         permissions,
         specifier,
         sender.clone(),
         fail_fast_tracker,
-        &specifier_options,
+        specifier_options,
       ))
     })
   });
@@ -1350,7 +1352,7 @@ async fn test_specifiers(
   ));
 
   let handler = {
-    tokio::task::spawn(async move {
+    spawn(async move {
       let earlier = Instant::now();
       let mut tests = IndexMap::new();
       let mut test_steps = IndexMap::new();
@@ -1887,7 +1889,7 @@ pub async fn run_tests_with_watch(
   // run, a process-scoped basic exit handler is required due to a tokio
   // limitation where it doesn't unbind its own handler for the entire process
   // once a user adds one.
-  tokio::task::spawn(async move {
+  spawn(async move {
     loop {
       signal::ctrl_c().await.unwrap();
       if !HAS_TEST_RUN_SIGINT_HANDLER.load(Ordering::Relaxed) {
@@ -2070,7 +2072,7 @@ fn start_output_redirect_thread(
   sender: UnboundedSender<TestEvent>,
   flush_state: Arc<Mutex<Option<std::sync::mpsc::Sender<()>>>>,
 ) {
-  tokio::task::spawn_blocking(move || loop {
+  spawn_blocking(move || loop {
     let mut buffer = [0; 512];
     let size = match pipe_reader.read(&mut buffer) {
       Ok(0) | Err(_) => break,
diff --git a/cli/tools/upgrade.rs b/cli/tools/upgrade.rs
index b5aefe479..cbd924755 100644
--- a/cli/tools/upgrade.rs
+++ b/cli/tools/upgrade.rs
@@ -17,6 +17,7 @@ use deno_core::anyhow::Context;
 use deno_core::error::AnyError;
 use deno_core::futures::future::BoxFuture;
 use deno_core::futures::FutureExt;
+use deno_core::task::spawn;
 use deno_semver::Version;
 use once_cell::sync::Lazy;
 use std::borrow::Cow;
@@ -198,7 +199,7 @@ pub fn check_for_upgrades(
   if update_checker.should_check_for_new_version() {
     let env = update_checker.env.clone();
     // do this asynchronously on a separate task
-    tokio::spawn(async move {
+    spawn(async move {
       // Sleep for a small amount of time to not unnecessarily impact startup
       // time.
       tokio::time::sleep(UPGRADE_CHECK_FETCH_DELAY).await;
diff --git a/cli/util/draw_thread.rs b/cli/util/draw_thread.rs
index 028b20d00..2fd81a78a 100644
--- a/cli/util/draw_thread.rs
+++ b/cli/util/draw_thread.rs
@@ -2,6 +2,7 @@
 
 use console_static_text::ConsoleStaticText;
 use deno_core::parking_lot::Mutex;
+use deno_core::task::spawn_blocking;
 use deno_runtime::ops::tty::ConsoleSize;
 use once_cell::sync::Lazy;
 use std::sync::Arc;
@@ -162,7 +163,7 @@ impl DrawThread {
     internal_state.has_draw_thread = true;
 
     let drawer_id = internal_state.drawer_id;
-    tokio::task::spawn_blocking(move || {
+    spawn_blocking(move || {
       let mut previous_size = console_size();
       loop {
         let mut delay_ms = 120;
diff --git a/cli/util/fs.rs b/cli/util/fs.rs
index 94ec24fe6..658002e3b 100644
--- a/cli/util/fs.rs
+++ b/cli/util/fs.rs
@@ -3,6 +3,7 @@
 use deno_core::anyhow::Context;
 use deno_core::error::AnyError;
 pub use deno_core::normalize_path;
+use deno_core::task::spawn_blocking;
 use deno_core::ModuleSpecifier;
 use deno_runtime::deno_crypto::rand;
 use deno_runtime::deno_node::PathClean;
@@ -503,7 +504,7 @@ impl LaxSingleProcessFsFlag {
               // This uses a blocking task because we use a single threaded
               // runtime and this is time sensitive so we don't want it to update
               // at the whims of of whatever is occurring on the runtime thread.
-              tokio::task::spawn_blocking({
+              spawn_blocking({
                 let token = token.clone();
                 let last_updated_path = last_updated_path.clone();
                 move || {