Jonas Bulow wrote:
>
> What is the "BSD-way" of access to shared memory (mmap:ed) secure (avoid
> race conditions, etc)? Right now I'm using posix semaphores but I would
> like to know if there is a substitute like the way kqueue is for
> select/poll.
Hmm, I think I lost some word and deeper thought in my previous mail.
:-)
The problem is as follows:
I have a couple of processes using a mmap:ed file as common data area.
What I want to do is to make it safe for all processes to update data in
this common memory area. I was thinking about using some part of the
common data area for semaphores in some way. I just want a simple
"test-and-set" operation I can use to make sure there is only one
process writing to the common data area.
To take the "test-and-set" further, I would like to make the process
wait for the lock to be released.
Can anyone give me hint how this is best implemented with FreeBSD as OS?
I apology if this is not a pure FreeBSD related question but I could not
find a better forum for this question. I could only find out solutions
based on posix semaphores.
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