Re: new semaphores

Manfred Spraul (masp0008@stud.uni-sb.de)
Sun, 29 Aug 1999 12:20:08 +0200

Andrea,
if you are modifying the semaphore code, perhaps you could add something
similar to the WinNT ERESOURCE:
* single writer, multiple reader.
* schedules other threads when busy.
* you cannot call "up_rsrc()" before you called "down_rsrc()" [this is
possible with semaphores, at least on NT], so wake-one should be possible.

IIRC, Alexander Viro wrote that he might need that to fix the VFS
read()/write()/truncate() synchronization.

--
    Manfred




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