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Re: [Fwd: [email@example.com: sem_* functions in cygwin]]
Gerrit P. Haase wrote:
Corinna Vinschen wrote:
[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
nearly all sem_* functions are available, but sem_unlock is missing,
was there a problem implementing sem_unlock() or was it just missed
----- 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
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.
I got an undefined reference to sem_unlock().
I don't remember now which package it was, however there is a maro
used in linux which is based on ipc_unlock():
#define sem_unlock(id) ipc_unlock(&sem_ids,id)
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