From 7f88b344adb92434814c82c839a513fc1ccf3b11 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Mon, 20 Jan 2020 15:25:21 +0100
Subject: mg2d: add a designated error code for reaching maxiter

Allows to reliably distinguish it from other error cases. Also specify
that the values of u are defined for this error code.
---
 mg2d_constants.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'mg2d_constants.h')

diff --git a/mg2d_constants.h b/mg2d_constants.h
index aa3d5cb..a197240 100644
--- a/mg2d_constants.h
+++ b/mg2d_constants.h
@@ -20,7 +20,14 @@
 #define MG2D_CONSTANTS_H
 
 enum MG2DError {
-    MG2D_ERR_DIVERGE = -0xff00,
+    /**
+     * The solver has diverged.
+     */
+    MG2D_ERR_DIVERGE         = -0xff00,
+    /* Maximum number of iterations has been executed without the solution
+     * reaching desired tolerance.
+     */
+    MG2D_ERR_MAXITER_REACHED = -0xff01,
 };
 
 /**
-- 
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