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Code Issues Packages 1 Wiki Activity

use single thread runime in tokio_util::block_on (#3080)

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This commit is contained in:
Bartek Iwańczuk 2019-10-07 10:31:56 +02:00 committed by Ryan Dahl
parent e1d49fe0fe
commit 41ed4cd34e
1 changed files with 5 additions and 6 deletions
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11
cli/tokio_util.rs
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@ -36,8 +36,10 @@ where
/// THIS IS A HACK AND SHOULD BE AVOIDED.
///
/// This creates a new tokio runtime, with many new threads, to execute the
/// given future. This is useful when we want to block the main runtime to
/// This spawns a new thread and creates a single-threaded tokio runtime on that thread,
/// to execute the given future.
///
/// This is useful when we want to block the main runtime to
/// resolve a future without worrying that we'll use up all the threads in the
/// main runtime.
pub fn block_on<F, R>(future: F) -> Result<R, ErrBox>
@ -50,10 +52,7 @@ where
let (sender, receiver) = channel();
// Create a new runtime to evaluate the future asynchronously.
thread::spawn(move || {
let r = match create_threadpool_runtime() {
Ok(mut rt) => rt.block_on(future),
Err(e) => Err(ErrBox::from(e)),
};
let r = tokio::runtime::current_thread::block_on_all(future);
sender
.send(r)
.expect("Unable to send blocking future result")