Fix a rather rare race condition in MT mode: we checked that we did

not yet visit a face by looking at a value that is written when
visiting this face. We double checked later when writing into it. In
some rare conditions, it could happen that another process was working
on it, but only wrote between the two checks, making the latter fail.

git-svn-id: https://svn.dealii.org/trunk@4910 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/doc/news/2001/c-3-1.html b/deal.II/doc/news/2001/c-3-1.html
index 6da9f8736d440753c07f7fb0d7be6d62e9d0c70e..ef7d213ef10e08b42af727c2c89b5c4111491ad4 100644 (file)
--- a/deal.II/doc/news/2001/c-3-1.html
+++ b/deal.II/doc/news/2001/c-3-1.html
@@ -568,6 +568,14 @@ documentation, etc</a>.
 <h3>deal.II</h3>
 
 <ol>
+  <li> <p>
+       Fixed: in a rather rare case, some work was done twice in the
+       <code class="class">KellyErrorEstimator</code> class when in
+       multithread mode. This is now fixed.
+       <br>
+       (WB 2001/08/24)
+       </p>
+
   <li> <p>
        New: There is now a class <code class="class">GridTools</code>
        which provides algorithms working on triangulations. At