stress: add a clock stresstest

Add a stresstest for gst_clock_get_time().

tests/benchmarks/Makefile.am

@@ -3,7 +3,8 @@ noinst_PROGRAMS = \
         complexity \
         init \
         mass-elements \
-        gstpollstress
+        gstpollstress \
+        gstclockstress
 
 LDADD = $(GST_OBJ_LIBS)
 AM_CFLAGS = $(GST_OBJ_CFLAGS)

tests/benchmarks/gstclockstress.c

@@ -0,0 +1,90 @@
+/* GStreamer
+ * Copyright (C) <2009> Wim Taymans <wim taymans at gmail dot com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <stdlib.h>
+#include <gst/gst.h>
+
+#define MAX_THREADS  100
+
+static gboolean running = TRUE;
+static gint count = 0;
+
+static void *
+run_test (void *user_data)
+{
+  gint prev;
+  GstClock *sysclock = GST_CLOCK_CAST (user_data);
+
+  while (running) {
+    gst_clock_get_time (sysclock);
+    prev = g_atomic_int_exchange_and_add (&count, 1);
+    if (prev == G_MAXINT)
+      g_warning ("overflow");
+  }
+  g_thread_exit (NULL);
+  return NULL;
+}
+
+gint
+main (gint argc, gchar * argv[])
+{
+  GThread *threads[MAX_THREADS];
+  gint num_threads;
+  gint t;
+  GstClock *sysclock;
+
+  gst_init (&argc, &argv);
+
+  if (argc != 2) {
+    g_print ("usage: %s <num_threads>\n", argv[0]);
+    exit (-1);
+  }
+
+  num_threads = atoi (argv[1]);
+
+  sysclock = gst_system_clock_obtain ();
+
+  for (t = 0; t < num_threads; t++) {
+    GError *error = NULL;
+
+    threads[t] = g_thread_create (run_test, sysclock, TRUE, &error);
+    if (error) {
+      printf ("ERROR: g_thread_create() %s\n", error->message);
+      exit (-1);
+    }
+  }
+  printf ("main(): Created %d threads.\n", t);
+
+  /* run for 5 seconds */
+  g_usleep (G_USEC_PER_SEC * 5);
+
+  printf ("main(): Stopping threads...\n");
+
+  running = FALSE;
+
+  for (t = 0; t < num_threads; t++) {
+    g_thread_join (threads[t]);
+  }
+
+  g_print ("performed %d get_time operations\n", count);
+
+  gst_object_unref (sysclock);
+
+  return 0;
+}