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Run the first block in a parallel! macro directly in the scope which guarantees that it will run immediately

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This commit is contained in:
John Kåre Alsaker 2019-02-23 16:47:13 +01:00
parent d5bb71c9f1
commit d2923e5a77
1 changed files with 6 additions and 5 deletions
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11
src/librustc_data_structures/sync.rs
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@ -280,21 +280,22 @@ cfg_if! {
#[macro_export]
macro_rules! parallel {
(impl [$($c:tt,)*] [$block:tt $(, $rest:tt)*]) => {
parallel!(impl [$block, $($c,)*] [$($rest),*])
(impl $fblock:tt [$($c:tt,)*] [$block:tt $(, $rest:tt)*]) => {
parallel!(impl $fblock [$block, $($c,)*] [$($rest),*])
};
(impl [$($blocks:tt,)*] []) => {
(impl $fblock:tt [$($blocks:tt,)*] []) => {
::rustc_data_structures::sync::scope(|s| {
$(
s.spawn(|_| $blocks);
)*
$fblock;
})
};
($($blocks:tt),*) => {
($fblock:tt, $($blocks:tt),*) => {
// Reverse the order of the blocks since Rayon executes them in reverse order
// when using a single thread. This ensures the execution order matches that
// of a single threaded rustc
parallel!(impl [] [$($blocks),*]);
parallel!(impl $fblock [] [$($blocks),*]);
};
}