Messages in this thread | | | Date | Sat, 20 Nov 1999 18:35:39 -0800 (PST) | From | Jeremy Fitzhardinge <> | Subject | Re: [Patch] shm bug introduced with pagecache in 2.3.11 |
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On 21-Nov-99 Linus Torvalds wrote: > - if a writer is waiting for readers (contention_wr), then the writer > will have already set the high bit, and a reader will know to wake it > up because the rw-semaphore value will be negative when it does > read_up().
I assume this also means that if a writer is blocked waiting for readers to exit, subsequent readers entering the semaphore are also blocked. If you don't do this, the writer can be starved forever by a continious stream of readers.
J
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