From 9e17b9e62d6bbbd94b0d3c139260fb4a3f28a989 Mon Sep 17 00:00:00 2001
From: Anna Petrasova <kratochanna@gmail.com>
Date: Fri, 17 Feb 2023 09:07:28 -0500
Subject: [PATCH] r.patch: disable parallelization when MASK is active (#2829)

---
 raster/r.patch/main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/raster/r.patch/main.c b/raster/r.patch/main.c
index 4744538eac3..4237172ddb3 100644
--- a/raster/r.patch/main.c
+++ b/raster/r.patch/main.c
@@ -113,6 +113,10 @@ int main(int argc, char *argv[])
                     "threads setting."));
     nprocs = 1;
 #endif
+    if (nprocs > 1 && G_find_raster("MASK", G_mapset()) != NULL) {
+        G_warning(_("Parallel processing disabled due to active MASK."));
+        nprocs = 1;
+    }
 
     use_zero = (zeroflag->answer);
     no_support = (nosupportflag->answer);