Add a timer API to libdimension.

1 files changed, 64 insertions, 0 deletions

diff --git a/libdimension/timer.c b/libdimension/timer.c
new file mode 100644
index 0000000..eb15357
--- /dev/null
+++ b/libdimension/timer.c
@@ -0,0 +1,64 @@
+/*************************************************************************
+ * Copyright (C) 2009-2010 Tavian Barnes <tavianator@gmail.com>          *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension 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 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension 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 program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+#include "dimension.h"
+#include <sys/times.h>
+#include <unistd.h>
+
+static long clk_tck = 0;
+
+dmnsn_timer *
+dmnsn_new_timer()
+{
+  /* Figure out the clock ticks per second */
+  if (!clk_tck) {
+    clk_tck = sysconf(_SC_CLK_TCK);
+    if (clk_tck == -1) {
+      dmnsn_error(DMNSN_SEVERITY_MEDIUM, "sysconf(_SC_CLK_TCK) failed.");
+      clk_tck = 1000000L;
+    }
+  }
+
+  dmnsn_timer *timer = dmnsn_malloc(sizeof(dmnsn_timer));
+
+  struct tms buf;
+  clock_t real = times(&buf);
+  timer->real   = (double)real/clk_tck;
+  timer->user   = (double)buf.tms_utime/clk_tck;
+  timer->system = (double)buf.tms_stime/clk_tck;
+
+  return timer;
+}
+
+void
+dmnsn_complete_timer(dmnsn_timer *timer)
+{
+  struct tms buf;
+  clock_t real = times(&buf);
+  timer->real   = (double)real/clk_tck - timer->real;
+  timer->user   = (double)buf.tms_utime/clk_tck - timer->user;
+  timer->system = (double)buf.tms_stime/clk_tck - timer->system;
+}
+
+void
+dmnsn_delete_timer(dmnsn_timer *timer)
+{
+  dmnsn_free(timer);
+}