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List:       linux-kernel
Subject:    Re: [Patch] shm bug introduced with pagecache in 2.3.11
From:       Jeremy Fitzhardinge <jeremy () goop ! org>
Date:       1999-11-21 2:35:39
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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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