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Feature #3193

closed

118: Correct use of reader-writer spinlocks

Added by Ilya Shchepetkov over 9 years ago. Updated over 7 years ago.

Status:
Closed
Priority:
Normal
Start date:
07/12/2012
Due date:
% Done:

100%

Estimated time:
Published in build:

Description

A reader-writer lock is a spinlock, except you lock it in one of two modes: a `read lock' or a `write lock'. More than one people can share a `read lock', but the write lock is exclusive: if someone has a write lock, no one can have any lock.

  • - multiple write locks are not permitted
    - multiple write unlocks are not permitted
  • - read lock is not permitted after write lock
  • - read unlock is not permitted before read lock
    - write unlock is not permitted before write lock
  • - read and write locks must be free at the end
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