mg2d: failer earlier when relaxation does not converge

1 files changed, 4 insertions, 0 deletions

diff --git a/mg2d.h b/mg2d.h
index a587a18..58308fd 100644
--- a/mg2d.h
+++ b/mg2d.h
@@ -22,6 +22,10 @@
 #include <stddef.h>
 #include <stdint.h>
 
+enum MG2DError {
+    MG2D_ERR_DIVERGE = -0xff00,
+};
+
 /**
  * Type of the boundary condition on a given boundary.
  */