c6eea222a9
This commit adds a variant of the `thread_local!` macro as a new `thread_local_const_init!` macro which requires that the initialization expression is constant (e.g. could be stuck into a `const` if so desired). This form of thread local allows for a more efficient implementation of `LocalKey::with` both if the value has a destructor and if it doesn't. If the value doesn't have a destructor then `with` should desugar to exactly as-if you use `#[thread_local]` given sufficient inlining. The purpose of this new form of thread locals is to precisely be equivalent to `#[thread_local]` on platforms where possible for values which fit the bill (those without destructors). This should help close the gap in performance between `thread_local!`, which is safe, relative to `#[thread_local]`, which is not easy to use in a portable fashion. |
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| .. | ||
| benches | ||
| src | ||
| tests | ||
| build.rs | ||
| Cargo.toml | ||