From: Daniel Arndt <arndtd@ornl.gov>
Date: Tue, 24 Jan 2023 04:10:16 +0000 (-0500)
Subject: Make ensure_kokkos_initialized thread-safe
X-Git-Tag: v9.5.0-rc1~618^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F14714%2Fhead;p=dealii.git

Make ensure_kokkos_initialized thread-safe
---

diff --git a/source/base/kokkos.cc b/source/base/kokkos.cc
index 7cf0a34d6a..5ea3b374c1 100644
--- a/source/base/kokkos.cc
+++ b/source/base/kokkos.cc
@@ -31,9 +31,14 @@ namespace internal
   {
     if (!Kokkos::is_initialized())
       {
-        dealii_initialized_kokkos = true;
-        Kokkos::initialize();
-        std::atexit(Kokkos::finalize);
+        // only execute once
+        static bool dummy = [] {
+          dealii_initialized_kokkos = true;
+          Kokkos::initialize();
+          std::atexit(Kokkos::finalize);
+          return true;
+        }();
+        (void)dummy;
       }
   }
 } // namespace internal