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Added atomic operations to `scanner_begin()` and `scanner_end()` to prevent
race conditions on the `executing` flag in free-threaded builds. Also added
tests for concurrent usage of the `re` module.
Without the atomic operations, `test_scanner_concurrent_access()` triggers
`assert(self->executing)` failures, or a thread sanitizer run emits errors.
(cherry picked from commit
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| .. | ||
| clinic | ||
| sre.c | ||
| sre.h | ||
| sre_constants.h | ||
| sre_lib.h | ||
| sre_targets.h | ||