[glib] Add GOnce tests

[Matthias Clasen <matthiasc src gnome org>]

commit 158a0366be6ea2af574f13208068104adb7ea2e7
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Sep 23 21:10:40 2011 -0400

    Add GOnce tests

 glib/tests/Makefile.am |    3 +
 glib/tests/once.c      |  125 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 128 insertions(+), 0 deletions(-)
---
diff --git a/glib/tests/Makefile.am b/glib/tests/Makefile.am
index 6a9ca57..7fe68e5 100644
--- a/glib/tests/Makefile.am
+++ b/glib/tests/Makefile.am
@@ -209,6 +209,9 @@ rec_mutex_LDADD  = $(progs_ldadd)
 TEST_PROGS      += rwlock
 rwlock_LDADD     = $(progs_ldadd)
 
+TEST_PROGS      += once
+once_LDADD       = $(progs_ldadd)
+
 # some testing of gtester funcitonality
 XMLLINT=xmllint
 gtester-xmllint-check: # check testreport xml with xmllint if present
diff --git a/glib/tests/once.c b/glib/tests/once.c
new file mode 100644
index 0000000..588754c
--- /dev/null
+++ b/glib/tests/once.c
@@ -0,0 +1,125 @@
+
+/* 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 ();
+}