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* Refactor locks package to build on non-LinuxMatthew Heon2019-01-04
| | | | | | | | Move SHM specific code into a subpackage. Within the main locks package, move the manager to be linux-only and add a non-Linux unsupported build file. Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
* Add an SHM-backed Lock Manager implementationMatthew Heon2019-01-04
| | | | Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
* Add interface for libpod multiprocess locksMatthew Heon2019-01-04
| | | | Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
* Improve documentation and unit tests for SHM locksMatthew Heon2019-01-04
| | | | Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
* Propogate error codes from SHM lock creation and openMatthew Heon2019-01-04
| | | | | | Also add a few more unit tests Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
* 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>
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