add gnulib `times' module

[bpt/guile.git] / lib / times.c

diff --git a/lib/times.c b/lib/times.c
new file mode 100644 (file)
index 0000000..cf2fa1d
--- /dev/null
+++ b/lib/times.c
@@ -0,0 +1,66 @@
+/* Get process times
+
+   Copyright (C) 2008-2013 Free Software Foundation, Inc.
+
+   This program 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, or (at your option)
+   any later version.
+
+   This program 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/>.  */
+
+/* Written by Simon Josefsson <simon@josefsson.org>, 2008.  */
+
+#include <config.h>
+
+/* Get times prototype. */
+#include <sys/times.h>
+
+/* Get round. */
+#include <math.h>
+
+/* Get GetProcessTimes etc. */
+#include <windows.h>
+
+static clock_t
+filetime2clock (FILETIME time)
+{
+  float f;
+
+  /* We have a 64-bit value, in the form of two DWORDS aka unsigned
+     int, counting the number of 100-nanosecond intervals.  We need to
+     convert these to clock ticks.  Older POSIX uses CLK_TCK to
+     indicate the number of clock ticks per second while modern POSIX
+     uses sysconf(_SC_CLK_TCK).  Mingw32 does not appear to have
+     sysconf(_SC_CLK_TCK), but appears to have CLK_TCK = 1000 so we
+     use it.  Note that CLOCKS_PER_SEC constant does not apply here,
+     it is for use with the clock function.  */
+
+  f = (unsigned long long) time.dwHighDateTime << 32;
+  f += time.dwLowDateTime;
+  f = f * CLK_TCK / 10000000;
+  return (clock_t) round (f);
+}
+
+clock_t
+times (struct tms * buffer)
+{
+  FILETIME creation_time, exit_time, kernel_time, user_time;
+
+  if (GetProcessTimes (GetCurrentProcess (), &creation_time, &exit_time,
+                       &kernel_time, &user_time) == 0)
+    return (clock_t) -1;
+
+  buffer->tms_utime = filetime2clock (user_time);
+  buffer->tms_stime = filetime2clock (kernel_time);
+  buffer->tms_cutime = 0;
+  buffer->tms_cstime = 0;
+
+  return filetime2clock (creation_time);
+}