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diff --git a/perf/cairo-perf.c b/perf/cairo-perf.c
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+/*
+ * Copyright (c) 2007 Netlabs
+ * Copyright (c) 2006 Mozilla Corporation
+ * Copyright (c) 2006 Red Hat, Inc.
+ * Copyright (c) 2011 Andrea Canciani
+ *
+ * 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
+ * the authors not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. The authors make no representations about the
+ * suitability of this software for any purpose. It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE AUTHORS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE AUTHORS 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.
+ *
+ * Authors: Peter Weilbacher <mozilla@weilbacher.org>
+ * Vladimir Vukicevic <vladimir@pobox.com> (win32/linux code)
+ * Carl Worth <cworth@cworth.org> (win32/linux code)
+ * Andrea Canciani <ranma42@gmail.com>
+ */
+
+#include "cairo-perf.h"
+#include "../src/cairo-time-private.h"
+
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#if defined(__OS2__)
+#define INCL_BASE
+#include <os2.h>
+#elif defined(_WIN32)
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#elif defined(_POSIX_PRIORITY_SCHEDULING)
+#include <sched.h>
+#endif
+
+
+/* timers */
+static cairo_time_t timer;
+static cairo_perf_timer_synchronize_t cairo_perf_timer_synchronize = NULL;
+static void *cairo_perf_timer_synchronize_closure = NULL;
+
+void
+cairo_perf_timer_set_synchronize (cairo_perf_timer_synchronize_t synchronize,
+ void *closure)
+{
+ cairo_perf_timer_synchronize = synchronize;
+ cairo_perf_timer_synchronize_closure = closure;
+}
+
+void
+cairo_perf_timer_start (void)
+{
+ timer = _cairo_time_get ();
+}
+
+void
+cairo_perf_timer_stop (void)
+{
+ if (cairo_perf_timer_synchronize)
+ cairo_perf_timer_synchronize (cairo_perf_timer_synchronize_closure);
+
+ timer = _cairo_time_get_delta (timer);
+}
+
+cairo_time_t
+cairo_perf_timer_elapsed (void)
+{
+ return timer;
+}
+
+void
+cairo_perf_yield (void)
+{
+ /* try to deactivate this thread until the scheduler calls it again */
+
+#if defined(__OS2__)
+ DosSleep (0);
+#elif defined(_WIN32)
+ SleepEx(0, TRUE);
+#elif defined(_POSIX_PRIORITY_SCHEDULING)
+ sched_yield ();
+#else
+ sleep (0);
+#endif
+}