Messages in this thread | | | Date | Mon, 08 Sep 2008 20:34:03 -0400 | From | Mathieu Desnoyers <> | Subject | [RFC PATCH 0/5] Priority Sifting Reader-Writer Lock v13 |
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Hi,
Here is the reworked version of what was initially called "Fair rwlock", then "writer-biased rwlock". Hopefully the naming should now better represent the innovation in this reader-writer locking scheme.
Thanks to Linus' patient explanations, it uses a single atomic op on a 32 bit variable in the fast path. The bright side of this is instruction-wise compactness of the fast path and that there is practically no limitation on the number of readers or writers. The downside is added memory ordering complexity between fast and slow path variables in the slow path.
Mathieu
-- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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