On 2009-02-26, Frantisek Hrbata <frantisek.hrb...@avg.com> wrote:
> I experimentally added support for dazukofs to our upcoming avg8
> because I would like to make some performance comparison between
> dazukofs and avflt.
Nice. It would be great if you could post the results of your tests
here.
> After dazukofs integration to our scanner I have noticed that
> dazukofs_get_access returns a lots of -EINTR. I am using dazukofs in
> a multi-threaded scanner and this error occurs only when more then
> one thread is used. I wrote a simple showfiles_mt application using
> dazukofs in several threads just to check out if the problem is in
> my integration or in dazukofs. As I found out I can easily reproduce
> this behavior with showfiles_mt.
I am running a multi-threaded application without any such
problems. However, my implementation is a bit different then yours. I
will try to illustrate the difference here using a diff-like approach.
int main(void)
{
...
- signal(SIGTERM, sigterm);
- signal(SIGINT, sigterm);
+ sigset_t sigset;
+
+ /* detect TERM signals */
+ signal(SIGTERM, sigterm);
+ signal(SIGINT, sigterm);
+ signal(SIGHUP, sigterm);
+
+ /* ignore SIGUSR1 (only used by threads) */
+ if (sigemptyset(&sigset) == 0) {
+ sigaddset(&sigset, SIGUSR1);
+ sigprocmask(SIG_BLOCK, &sigset, NULL);
+ }
+ sigset_t sigset;
+ if (sigemptyset(&sigset) == 0) {
+ sigaddset(&sigset, SIGTERM);
+ sigaddset(&sigset, SIGINT);
+ sigaddset(&sigset, SIGHUP);
+ pthread_sigmask(SIG_BLOCK, &sigset, NULL);
+ }
Also there is just a simple single process example
> shipped within dazukofs package so I am not sure if I am using it
> right. But as I peeked into the code I think my integration is ok. I
> wasn't digging very deep, but I am pretty sure the -ERESTARTSYS is
> returned by wait_event_freezable in dazukofs_get_event. I just can
> not see what(signal?) is interrupting it. Anyway I attached a patch
> for dazukofs-3.0.0 which adds showfiles_mt so you should be able to
> reproduce it.
>
> 1) copy dazukofs-3.0.0-showfiles_mt.patch into the dazukofs-3.0.0
> source code
>
> 2) in the dazukofs-3.0.0 directory use
> $ patch -p1 < dazukofs-3.0.0-showfiles_mt.patch
>
> 3) now you can use showfiles_mt in the same way as showfiles
>
> Could you please look at the showfiles_mt if my implementation is ok
> or if there is a bug in dazukofs?
>
> Thanx
>
> -FH
>
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> Dazuko-devel@nongnu.org
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