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71 lines
2.4 KiB
Rust
71 lines
2.4 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::task::MaskFutureAsSend;
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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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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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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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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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