libuv does not expect concurrent operations on `uv_dir_t` instances,
and will gladly create memory leaks, corrupt data, or crash the
process.
This patch forbids that, and:
- Makes sure that concurrent async operations are run sequentially
- Throws an exception if sync operations are attempted during an
async operation
The assumption here is that a thrown exception is preferable to
a potential hard crash.
This fully fixes flakiness from `parallel/test-fs-opendir` when
run under ASAN.
PR-URL: https://github.com/nodejs/node/pull/33274
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
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