Sergey Bugaev 05ba4295e9 Kernel: Introduce shared locking mode ...

A Lock can now be held either in shared or exclusive mode. Multiple threads can
hold the same lock in shared mode at one time, but if any thread holds the lock
in exclusive mode, no other thread can hold it at the same time in either mode.

2020-04-18 13:58:29 +02:00

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