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style: Document the parallel traversal.

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Emilio Cobos Álvarez 2016-12-31 04:15:17 +01:00
parent 84361d2f0f
commit e03ef33f58
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1 changed files with 8 additions and 2 deletions
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10
components/style/parallel.rs
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@ -20,6 +20,8 @@
//! easy to grep for. At the time of this writing, there is no other unsafe
//! code in the parallel traversal.
#![deny(missing_docs)]
use dom::{OpaqueNode, SendNode, TElement, TNode};
use rayon;
use scoped_tls::ScopedTLS;
@ -28,8 +30,12 @@ use std::sync::atomic::Ordering;
use traversal::{DomTraversal, PerLevelTraversalData, PreTraverseToken};
use traversal::{STYLE_SHARING_CACHE_HITS, STYLE_SHARING_CACHE_MISSES};
/// The chunk size used to split the parallel traversal nodes.
///
/// We send each `CHUNK_SIZE` nodes as a different work unit to the work queue.
pub const CHUNK_SIZE: usize = 64;
/// A parallel top down traversal, generic over `D`.
#[allow(unsafe_code)]
pub fn traverse_dom<N, D>(traversal: &D,
root: N::ConcreteElement,
@ -37,7 +43,7 @@ pub fn traverse_dom<N, D>(traversal: &D,
token: PreTraverseToken,
queue: &rayon::ThreadPool)
where N: TNode,
D: DomTraversal<N>
D: DomTraversal<N>,
{
if opts::get().style_sharing_stats {
STYLE_SHARING_CACHE_HITS.store(0, Ordering::SeqCst);
@ -181,7 +187,7 @@ fn bottom_up_dom<N, D>(traversal: &D,
root: OpaqueNode,
mut node: N)
where N: TNode,
D: DomTraversal<N>
D: DomTraversal<N>,
{
loop {
// Perform the appropriate operation.