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https://github.com/denoland/deno.git
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122 lines
3.7 KiB
Rust
122 lines
3.7 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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use std::fmt::Debug;
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use std::str::FromStr;
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use deno_core::unsync::MaskFutureAsSend;
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#[cfg(tokio_unstable)]
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use tokio_metrics::RuntimeMonitor;
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/// Default configuration for tokio. In the future, this method may have different defaults
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/// depending on the platform and/or CPU layout.
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const fn tokio_configuration() -> (u32, u32, usize) {
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(61, 31, 1024)
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}
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fn tokio_env<T: FromStr>(name: &'static str, default: T) -> T
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where
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<T as FromStr>::Err: Debug,
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{
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match std::env::var(name) {
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Ok(value) => value.parse().unwrap(),
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Err(_) => default,
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}
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}
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pub fn create_basic_runtime() -> tokio::runtime::Runtime {
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let (event_interval, global_queue_interval, max_io_events_per_tick) =
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tokio_configuration();
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tokio::runtime::Builder::new_current_thread()
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.enable_io()
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.enable_time()
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.event_interval(tokio_env("DENO_TOKIO_EVENT_INTERVAL", event_interval))
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.global_queue_interval(tokio_env(
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"DENO_TOKIO_GLOBAL_QUEUE_INTERVAL",
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global_queue_interval,
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))
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.max_io_events_per_tick(tokio_env(
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"DENO_TOKIO_MAX_IO_EVENTS_PER_TICK",
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max_io_events_per_tick,
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))
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// This limits the number of threads for blocking operations (like for
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// synchronous fs ops) or CPU bound tasks like when we run dprint in
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// parallel for deno fmt.
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// The default value is 512, which is an unhelpfully large thread pool. We
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// don't ever want to have more than a couple dozen threads.
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.max_blocking_threads(32)
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.build()
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.unwrap()
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}
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#[inline(always)]
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fn create_and_run_current_thread_inner<F, R>(
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future: F,
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metrics_enabled: bool,
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) -> R
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where
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F: std::future::Future<Output = R> + 'static,
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R: Send + 'static,
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{
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let rt = create_basic_runtime();
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// Since this is the main future, we want to box it in debug mode because it tends to be fairly
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// large and the compiler won't optimize repeated copies. We also make this runtime factory
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// function #[inline(always)] to avoid holding the unboxed, unused future on the stack.
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#[cfg(debug_assertions)]
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// SAFETY: this this is guaranteed to be running on a current-thread executor
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let future = Box::pin(unsafe { MaskFutureAsSend::new(future) });
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#[cfg(not(debug_assertions))]
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// SAFETY: this this is guaranteed to be running on a current-thread executor
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let future = unsafe { MaskFutureAsSend::new(future) };
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#[cfg(tokio_unstable)]
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let join_handle = if metrics_enabled {
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rt.spawn(async move {
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let metrics_interval: u64 = std::env::var("DENO_TOKIO_METRICS_INTERVAL")
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.ok()
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.and_then(|val| val.parse().ok())
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.unwrap_or(1000);
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let handle = tokio::runtime::Handle::current();
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let runtime_monitor = RuntimeMonitor::new(&handle);
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tokio::spawn(async move {
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for interval in runtime_monitor.intervals() {
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println!("{:#?}", interval);
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// wait 500ms
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tokio::time::sleep(std::time::Duration::from_millis(
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metrics_interval,
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))
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.await;
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}
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});
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future.await
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})
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} else {
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rt.spawn(future)
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};
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#[cfg(not(tokio_unstable))]
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let join_handle = rt.spawn(future);
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rt.block_on(join_handle).unwrap().into_inner()
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}
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#[inline(always)]
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pub fn create_and_run_current_thread<F, R>(future: F) -> R
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where
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F: std::future::Future<Output = R> + 'static,
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R: Send + 'static,
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{
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create_and_run_current_thread_inner(future, false)
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}
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#[inline(always)]
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pub fn create_and_run_current_thread_with_maybe_metrics<F, R>(future: F) -> R
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where
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F: std::future::Future<Output = R> + 'static,
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R: Send + 'static,
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{
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let metrics_enabled = std::env::var("DENO_TOKIO_METRICS").ok().is_some();
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create_and_run_current_thread_inner(future, metrics_enabled)
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}
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