Move the MT reusable-input wait decision and lock/overlap/condition-wait
ordering into Rust through a small callback projection. C retains ownership
of the pthread synchronization objects, private LDM window, and diagnostics.
Add layout assertions and callback-order tests for enabled and disabled LDM.
Test Plan:
- ulimit -v 41943040; CARGO_BUILD_JOBS=1; cargo test --manifest-path rust/Cargo.toml
- ulimit -v 41943040; CARGO_BUILD_JOBS=1; cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings
- ulimit -v 41943040; make -B -C programs -j1 zstd
- ulimit -v 41943040; make -C tests -j1 test-zstream ZSTREAM_TESTTIME=-T1s
ddidderr
082c5a7dbe