[test] Add a simple multithreading test

test/Makefile.am

@@ -771,6 +771,7 @@ REFERENCE_IMAGES = \
 	pdf-surface-source.svg12.rgb24.xfail.png \
 	pixman-rotate.ref.png \
 	pixman-rotate.rgb24.ref.png \
+	pthread-similar.ref.png \
 	ps-surface-source.rgb24.ref.png \
 	ps-surface-source.argb32.ref.png \
 	ps-surface-source.svg12.argb32.xfail.png \

test/Makefile.sources

@@ -244,7 +244,10 @@ test_sources = \
 	xcomposite-projection.c				\
 	zero-alpha.c
 
-pthread_test_sources = pthread-show-text.c
+pthread_test_sources =					\
+	pthread-show-text.c				\
+	pthread-similar.c				\
+	$(NULL)
 
 ft_font_test_sources = \
 	bitmap-font.c \

test/pthread-similar.c

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2009 Benjamin Otte
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without
+ * fee, provided that the above copyright notice appear in all copies
+ * and that both that copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of
+ * Benjamin Otte not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Benjamin Otte makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * BENJAMIN OTTE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL BENJAMIN OTTE BE LIABLE FOR ANY SPECIAL,
+ * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+ * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Author: Benjamin Otte <otte@gnome.org>
+ */
+
+#include "cairo-test.h"
+#include <pthread.h>
+
+#define N_THREADS 8
+
+#define WIDTH 64
+#define HEIGHT 8
+
+static void *
+draw_thread (void *arg)
+{
+    cairo_surface_t *surface = arg;
+    cairo_t *cr;
+    int x, y;
+
+    cr = cairo_create (surface);
+    cairo_surface_destroy (surface);
+
+    for (y = 0; y < HEIGHT; y++) {
+        for (x = 0; x < WIDTH; x++) {
+            cairo_rectangle (cr, x, y, 1, 1);
+            cairo_set_source_rgba (cr, 0, 0.75, 0.75, (double) x / WIDTH);
+            cairo_fill (cr);
+        }
+    }
+
+    surface = cairo_surface_reference (cairo_get_target (cr));
+    cairo_destroy (cr);
+
+    return surface;
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    pthread_t threads[N_THREADS];
+    cairo_test_status_t test_status = CAIRO_TEST_SUCCESS;
+    int i;
+
+    for (i = 0; i < N_THREADS; i++) {
+	cairo_surface_t *surface;
+
+        surface = cairo_surface_create_similar (cairo_get_target (cr),
+						CAIRO_CONTENT_COLOR,
+						WIDTH, HEIGHT);
+        if (pthread_create (&threads[i], NULL, draw_thread, surface) != 0) {
+	    threads[i] = pthread_self ();
+            test_status = cairo_test_status_from_status (cairo_test_get_context (cr),
+							 cairo_surface_status (surface));
+            cairo_surface_destroy (surface);
+	    break;
+        }
+    }
+
+    for (i = 0; i < N_THREADS; i++) {
+	void *surface;
+
+        if (pthread_equal (threads[i], pthread_self ()))
+            break;
+
+        if (pthread_join (threads[i], &surface) != 0) {
+            test_status = CAIRO_TEST_FAILURE;
+	    break;
+	}
+
+        cairo_set_source_surface (cr, surface, 0, 0);
+        cairo_surface_destroy (surface);
+        cairo_paint (cr);
+
+        cairo_translate (cr, 0, HEIGHT);
+    }
+
+    return test_status;
+}
+
+CAIRO_TEST (pthread_similar,
+	    "Draw lots of 1x1 rectangles on similar surfaces in lots of threads",
+	    "threads", /* keywords */
+	    NULL, /* requirements */
+	    WIDTH, HEIGHT * N_THREADS,
+	    NULL, draw)