[Catching up on some older mails]
----- Forwarded message from "Gerrit P. Haase" -----
From: "Gerrit P. Haase"
To: cygwin ML
Subject: sem_* functions in cygwin
Date: Sun, 21 Nov 2004 22:48:20 +0100
Hi,
nearly all sem_* functions are available, but sem_unlock is missing,
was there a problem implementing sem_unlock() or was it just missed
by accident?
Gerrit
----- End forwarded message -----
I guess you're asking about sem_unlink(). It's not implemented so far
since named POSIX semaphores are implemented using named Windows semaphores.
The SUSv3 description contains a pretty unfortunate implementation detail:
Calls to sem_open() to recreate or reconnect to the semaphore refer
to a new semaphore after sem_unlink() is called.
There's no way I know of, which allows to implement this using named
Windows semaphores. At least not without adding a lot of annoying
bookkeeping overhead, possibly involving cygserver.