Fix: Move MPI Thread Level Check (#2786)

* Fix: Move MPI Thread Level Check

Move the MPI thread level check (requested vs. provided) into `InitData()`.
This is needed, since we will access the warning
logger, which itself needs to be accessed via a WarpX instance.

This is also cleaner than just moving this behind the constructor
in `main.cpp`, as we have less functions to call around the
`WarpX` object usage.

* Fix MPI=OFF

1 files changed, 8 insertions, 3 deletions

diff --git a/Source/Utils/MPIInitHelpers.H b/Source/Utils/MPIInitHelpers.H
index 7147ee0e1..d0c2f8e1d 100644
--- a/Source/Utils/MPIInitHelpers.H
+++ b/Source/Utils/MPIInitHelpers.H
@@ -11,6 +11,13 @@
 
 namespace utils
 {
+    /** Return the required MPI threading
+     *
+     * @return the MPI_THREAD_* level required for MPI_Init_thread
+     */
+    int
+    warpx_mpi_thread_required ();
+
     /** Initialize MPI
      *
      * @return pair(required, provided) of MPI thread level from MPI_Init_thread
@@ -21,11 +28,9 @@ namespace utils
     /** Check if the requested MPI thread level is valid
      *
      * Prints warnings and notes otherwise.
-     *
-     * @param mpi_thread_levels pair(required, provided) of MPI thread level from MPI_Init_thread
      */
     void
-    warpx_check_mpi_thread_level (std::pair< int, int > const mpi_thread_levels);
+    warpx_check_mpi_thread_level ();
 
 } // namespace utils