[clug] Semaphores and shared memory
mbp at sourcefrog.net
Tue Dec 9 10:11:47 GMT 2003
On 9 Dec 2003, Jepri <jepri at webone.com.au> wrote:
> I've got some chunky data files that I would like to access at the same
> time from different programs. I know that I can mmap the files into
> different programs at the same time, but what's the right way (TM) for
> the programs to let each other know when they are updating the files?
> Ideally I'd use mutex or something, but I'm not sure how to share these
> between programs that do not have a common parent. Do I have to resort
> to some kind of formal IPC like SysV shared memory ?
Just lock the file. man lockf.
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