[vdr] thread safe tools.c

["C.Y.M" <syphir@syphir.sytes.net>]

Rainer Zocholl wrote:
> This is a patch to add thread safe functins to tools.c
> Serveral other functions in vdr and (that's the problem)
> plugins uses some of those return "static". 
> So the entire patches maybe to long to post?
>
>
> Of course the non"_r" counter parts will become superflous,
> so a rename is not required.
> But removing them now would cause serveral plugins not
> to compile anymore.
>
> I have not checked if all those functions are really called 
> in two threads at the same time, so the plugins may run
> without patching (at least mostly, because the problematic
> timing windows are usually very small, not reproducible, 
> and the side effects may not cause segfaults.).
>
> I think "AddDir" maybe very critical as it is used by many plugins
> and VDR is not using it only while in init, AFAS.
>
> So sorry for the non developers:
> This will not be the last patch to make vdr thread proof.
>
>
>
> I have patched the caller modules to use the new functions
> and found no new problems generated, but 4..10 eyes may see more ;-)
Thank you for this.  I just noticed that this patch got a little 
corrupted in this one hunk so becareful when applying it.  But other 
than that, it seems to be working just fine.

@@ -468,19 +532,28 @@
             system("sync");
             remove(buf);
             gettimeofday(&tp2, NULL);
-            double seconds = (((long long)tp2.tv_sec * 1000000 + 
tp2.tv_usec) - ((long long)tp1.tv_sec * 100
0000 + tp1.tv_usec)) / 1000000.0;
+            double seconds = (((long long)tp2.tv_sec * 1000000 + 
tp2.tv_usec) - ((long long)tp1.tv_sec * 100
0000 + tp1
+.tv_usec)) / 1000000.0;