1 files changed, 135 insertions, 0 deletions
diff --git a/Source/DirectFB/lib/direct/clock.c b/Source/DirectFB/lib/direct/clock.c
new file mode 100755
index 0000000..e77bfe2
--- /dev/null
+++ b/Source/DirectFB/lib/direct/clock.c
@@ -0,0 +1,135 @@
+/*
+   (c) Copyright 2001-2009  The world wide DirectFB Open Source Community (directfb.org)
+   (c) Copyright 2000-2004  Convergence (integrated media) GmbH
+
+   All rights reserved.
+
+   Written by Denis Oliver Kropp <dok@directfb.org>,
+              Andreas Hundt <andi@fischlustig.de>,
+              Sven Neumann <neo@directfb.org>,
+              Ville Syrjälä <syrjala@sci.fi> and
+              Claudio Ciccani <klan@users.sf.net>.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser 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 <config.h>
+
+#include <direct/clock.h>
+#include <direct/debug.h>
+#include <direct/util.h>
+
+#ifdef CLOCK_MONOTONIC
+#include <sys/syscall.h>
+#endif
+#include <sys/time.h>
+#include <time.h>
+
+D_DEBUG_DOMAIN( Direct_Clock, "Direct/Clock", "Time measurement etc." );
+
+static struct timeval start_time = { 0, 0 };
+
+/* libc has incredibly messy way of doing this,
+ * typically requiring -lrt. We just skip all this mess */
+struct timeval*
+direct_monotonic_gettimeofday( struct timeval *tv )
+{
+     struct timespec ts;
+
+#ifdef CLOCK_MONOTONIC
+     /* No locking or atomic ops for no_monotonic here */
+     static int no_monotonic = 0;
+
+     if (!no_monotonic)
+          if(syscall( __NR_clock_gettime, CLOCK_MONOTONIC, &ts ))
+              no_monotonic = 1;
+
+     if (no_monotonic)
+          if(syscall(__NR_clock_gettime, CLOCK_REALTIME, &ts))
+#endif
+          {
+               gettimeofday( tv, NULL );
+               return tv;
+          }
+
+     tv->tv_sec = ts.tv_sec;
+     tv->tv_usec = ts.tv_nsec / 1000;
+
+     return tv;
+}
+
+long long
+direct_clock_get_micros( void )
+{
+     struct timeval tv;
+     long long      ret;
+
+     if (start_time.tv_sec == 0) {
+          direct_monotonic_gettimeofday( &start_time );
+          return 0;
+     }
+
+     direct_monotonic_gettimeofday( &tv );
+
+     ret = (long long)(tv.tv_sec - start_time.tv_sec) * 1000000LL +
+           (long long)(tv.tv_usec - start_time.tv_usec);
+     if (ret < 0) {
+          D_DEBUG_AT( Direct_Clock, "Clock skew detected (%lld in the past)!\n", -ret );
+          start_time = tv;
+          ret = 0;
+     }
+
+     return ret;
+}
+
+long long
+direct_clock_get_millis( void )
+{
+     return direct_clock_get_micros() / 1000LL;
+}
+
+void
+direct_clock_set_start( const struct timeval *start )
+{
+     long long diff;
+
+     D_ASSERT( start != NULL );
+
+     diff = (long long)(start->tv_sec  - start_time.tv_sec)  * 1000LL +
+            (long long)(start->tv_usec - start_time.tv_usec) / 1000LL;
+
+     D_DEBUG_AT( Direct_Clock, "Adjusting start time "
+                 "(%lld.%lld seconds diff)\n", diff / 1000LL, ABS(diff) % 1000LL );
+
+     start_time = *start;
+}
+
+long long
+direct_clock_get_abs_micros( void )
+{
+     struct timeval tv;
+
+     direct_monotonic_gettimeofday( &tv );
+
+     return (long long)(tv.tv_sec) * 1000000LL + (long long)(tv.tv_usec);
+}
+
+long long
+direct_clock_get_abs_millis( void )
+{
+     return direct_clock_get_abs_micros() / 1000LL;
+}
+