Re: what is the preferred way to wait while polling a flag

[Tristan Van Berkom <tvb gnome org>]

Ooops, forgot to CC the list:

On Thu, May 17, 2012 at 1:43 PM, Rick Berger <rckbrgr gmail com> wrote:
> In GTK+ 2.20, what is the preferred way to wait while polling a flag in
> shared memory every 25 milliseconds in code something like this?

The preferred thing to do is to never use polling for synchronization
of processes and threads.

Rather, use events and messages to unblock sleeping threads.

Instead of running the following loop for instance, you could simply
call `read()', the read() call will block when called on a FIFO
(named pipe) until data appears on the file descriptor.

Cheers,
            -Tristan

> gint n;
> for( n=10; n && (sharedMemory->flag != 1), n--) {
>
>
> /* wait 25 milliseconds */
>
> }
>
>
> if( n == 0 ) {
>
> g_warning("Timed out while waiting for flag");
>
>  return 0;
>
>  }
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