Path: utzoo!attcan!uunet!maverick.ksu.ksu.edu!umriscc!mcs213f.cs.umr.edu!bobn
From: bobn@mcs213f.cs.umr.edu (Bob Niedergerke)
Newsgroups: comp.os.os2.programmer
Subject: Re: Counting semaphores?
Message-ID: <1557@umriscc.isc.umr.edu>
Date: 29 Oct 90 22:08:53 GMT
References: <90Oct26.163804edt.8236@orasis.vis.toronto.edu> <11219@hubcap.clemson.edu>
Sender: news@umriscc.isc.umr.edu
Organization: University of Missouri - Rolla
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In article <11219@hubcap.clemson.edu> lsalomo@hubcap.clemson.edu (lsalomo) writes:
>From article <90Oct26.163804edt.8236@orasis.vis.toronto.edu>, by green@vis.toronto.edu (Anthony Thomas Green):
>> Is it possible to set up a system semaphore that must be cleared as many
>> times as it has been set in order for a waiting thread to become runnable?
>
>I always thought that's the way RAM semaphores were implemented?

It all depends.  If you use DosSemRequest and DosSemClear, the behavior is
as described above.  Using a DosSemWait/DosSemClear scheme, the semaphore
need only be cleared once for a waiting thread to become runnable.

bobn