Upgrade rust/crates/rayon-core to 1.9.1 am: 3e7fe75dd7

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rayon-core/+/1713051

Change-Id: I97d1e08dab09f50b3cabfe098ce937ce80432594
tree: 2c58548a32b572adf376984230f4061ef1449220
  1. src/
  2. tests/
  3. .cargo_vcs_info.json
  4. Android.bp
  5. build.rs
  6. Cargo.toml
  7. Cargo.toml.orig
  8. LICENSE-APACHE
  9. LICENSE-MIT
  10. METADATA
  11. MODULE_LICENSE_APACHE2
  12. OWNERS
  13. README.md
README.md

Rayon-core represents the “core, stable” APIs of Rayon: join, scope, and so forth, as well as the ability to create custom thread-pools with ThreadPool.

Maybe worth mentioning: users are not necessarily intended to directly access rayon-core; all its APIs are mirror in the rayon crate. To that end, the examples in the docs use rayon::join and so forth rather than rayon_core::join.

rayon-core aims to never, or almost never, have a breaking change to its API, because each revision of rayon-core also houses the global thread-pool (and hence if you have two simultaneous versions of rayon-core, you have two thread-pools).

Please see Rayon Docs for details about using Rayon.

Rayon-core currently requires rustc 1.36.0 or greater.