Serialize Perl compilation for thread safety - #918
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Add a reentrant global compilation boundary across initial source and AST compilation, both eval backends, lazy named-sub materialization, reset, and runtime verifier fallback. Release each entry point's own hold before ordinary execution while preserving nested BEGIN/use/require/eval compilation. Add deterministic concurrency and failure-path coverage, and record Phase 2 completion and validation in the threads design plan. Generated with [Codex](https://openai.com/codex/) Co-Authored-By: Codex <codex@openai.com>
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Summary
BEGIN/use/require/eval compilation while releasing each entry point's own hold before ordinary executiondev/design/concurrency.mdThis is the independent Phase 2 PR in the Perl threads implementation train. It establishes compiler serialization only; runtime state isolation begins in later phases.
Validation
make— passedeval_context_stack_reentrancy.t— passed on JVM and interpreter backendsmake test-all— exited 0; core 83.0%, bundled modules 80.8%Design
See
dev/design/concurrency.md, Phase 2 and Progress Tracking.