add a test with VIPS_STALL

stresses the caching and locality systems

test/Makefile.am

@@ -5,6 +5,7 @@ TESTS = \
 	test_cli.sh \
 	test_formats.sh \
 	test_seq.sh \
+	test_stall.sh \
 	test_threading.sh 
 
 SUBDIRS = \
@@ -32,6 +33,7 @@ EXTRA_DIST = \
 	test_formats.sh \
 	test_seq.sh \
 	test_thumbnail.sh \
+	test_stall.sh \
 	test_threading.sh 
 
 clean-local: 

test/test_stall.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+# set -x
+set -e
+
+. ./variables.sh
+
+if test_supported tiffload; then
+	VIPS_STALL=1 vips copy $image $tmp/x.tif
+  cat > $tmp/mask.con <<EOF
+3 3 8 0
+-1 -1 -1
+-1 16 -1
+-1 -1 -1
+EOF
+	VIPS_STALL=1 vips conv $tmp/x.tif $tmp/x2.tif $tmp/mask.con
+fi