copies-rust: move CPU-heavy Rust processing into a child thread
… that runs in parallel with the parent thread fetching data.
This can be disabled through a new config. CLI example:
hg --config=devel.copy-tracing.multi-thread=no
For now both threads use the GIL, later commits will reduce this.
Differential Revision: https://phab.mercurial-scm.org/D9684
# See http://EditorConfig.org for the specification
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[*.{c,h}]
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[*.t]
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