--- /dev/null
+
+/* Unit tests for GOnce and friends
+ * Copyright (C) 2011 Red Hat, Inc
+ * Author: Matthias Clasen
+ *
+ * This work is provided "as is"; redistribution and modification
+ * in whole or in part, in any medium, physical or electronic is
+ * permitted without restriction.
+ *
+ * This work is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * In no event shall the authors or contributors be liable for any
+ * direct, indirect, incidental, special, exemplary, or consequential
+ * damages (including, but not limited to, procurement of substitute
+ * goods or services; loss of use, data, or profits; or business
+ * interruption) however caused and on any theory of liability, whether
+ * in contract, strict liability, or tort (including negligence or
+ * otherwise) arising in any way out of the use of this software, even
+ * if advised of the possibility of such damage.
+ */
+
+#include <glib.h>
+
+static gpointer
+do_once (gpointer data)
+{
+ static gint i = 0;
+
+ i++;
+
+ return GINT_TO_POINTER (i);
+}
+
+static void
+test_once1 (void)
+{
+ GOnce once = G_ONCE_INIT;
+ gpointer res;
+
+ g_assert (once.status == G_ONCE_STATUS_NOTCALLED);
+
+ res = g_once (&once, do_once, NULL);
+ g_assert_cmpint (GPOINTER_TO_INT (res), ==, 1);
+
+ g_assert (once.status == G_ONCE_STATUS_READY);
+
+ res = g_once (&once, do_once, NULL);
+ g_assert_cmpint (GPOINTER_TO_INT (res), ==, 1);
+}
+
+static void
+test_once2 (void)
+{
+ static gsize init = 0;
+
+ if (g_once_init_enter (&init))
+ {
+ g_assert (TRUE);
+ g_once_init_leave (&init, 1);
+ }
+
+ g_assert_cmpint (init, ==, 1);
+ if (g_once_init_enter (&init))
+ {
+ g_assert_not_reached ();
+ g_once_init_leave (&init, 2);
+ }
+ g_assert_cmpint (init, ==, 1);
+}
+
+#define THREADS 100
+
+static gint64 shared;
+
+static void
+init_shared (void)
+{
+ static gsize init = 0;
+
+ if (g_once_init_enter (&init))
+ {
+ shared += 42;
+
+ g_once_init_leave (&init, 1);
+ }
+}
+
+static gpointer
+thread_func (gpointer data)
+{
+ init_shared ();
+
+ return NULL;
+}
+
+static void
+test_once3 (void)
+{
+ gint i;
+ GThread *threads[THREADS];
+
+ shared = 0;
+
+ for (i = 0; i < THREADS; i++)
+ threads[i] = g_thread_create (thread_func, NULL, TRUE, NULL);
+
+ for (i = 0; i < THREADS; i++)
+ g_thread_join (threads[i]);
+
+ g_assert_cmpint (shared, ==, 42);
+}
+
+int
+main (int argc, char *argv[])
+{
+ g_test_init (&argc, &argv, NULL);
+
+ g_test_add_func ("/thread/once1", test_once1);
+ g_test_add_func ("/thread/once2", test_once2);
+ g_test_add_func ("/thread/once3", test_once3);
+
+ return g_test_run ();
+}