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<https://github.com/pantsbuild/pex/issues/1971|#1971 Pex POSIX locking appears to be broken.>
New issue created by <https://github.com/jsirois|jsirois>
I added a knob to force bsd style locks using `_PEX_LOCK_FILE_STYLE=bsd` in <https://github.com/pantsbuild/pex/pull/1962|#1962> and this looks like it solved <https://github.com/pantsbuild/pex/issues/1969|#1969>. The failure mechanism of POSIX locks needs to be understood and either bsd locks switched to wholesale or else POSIX locks fixed. The `_PEX_LOCK_FILE_STYLE` env var should then be deprecated to emit warning messages on use and then removed in 3.0.0.
<https://github.com/pantsbuild/pex|pantsbuild/pex>