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* Add mutex invariant to SHM semaphores.Matthew Heon2019-01-04
| | | | | | | | | | | | Check value of semaphores when incrementing to ensure we never go beyond 1, preserving mutex invariants. Also, add cleanup code to the lock tests, ensuring that we never leave the locks in a bad state after a test. We aren't destroying and recreating the SHM every time, so we have to be careful not to leak state between test runs. Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
* Initial skeleton of in-memory locksMatthew Heon2019-01-04
Signed-off-by: Matthew Heon <matthew.heon@gmail.com>