check.c (gfc_check_system_clock): New function.

	* check.c (gfc_check_system_clock): New function.
	* intrinsic.c (add_sym_3s): New function.
	(add_subroutines): Use it.
	* intrinsic.h (gfc_check_system_clock, gfc_resolve_system_clock):
	Add prototypes.
	* iresolve.c (gfc_resolve_system_clock): New function.
libgfortran/
	* intrinsics/system_clock: New file.
	* Makefile.am: Add intrinsics/system_clock.c.
	* Makefile.in: Regenerate.

From-SVN: r82131

1 files changed, 200 insertions, 0 deletions

diff --git a/libgfortran/intrinsics/system_clock.c b/libgfortran/intrinsics/system_clock.c
new file mode 100644
index 0000000..6b6ae9d
--- /dev/null
+++ b/libgfortran/intrinsics/system_clock.c
@@ -0,0 +1,200 @@
+/* Implementation of the SYSTEM_CLOCK intrinsic.
+   Copyright (C) 2004 Free Software Foundation, Inc.
+
+This file is part of the GNU Fortran 95 runtime library (libgfortran).
+
+Libgfortran 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 2.1 of the License, or (at your option) any later version.
+
+Libgfortran 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 libgfortran; see the file COPYING.LIB.  If not,
+write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include "config.h"
+#include <sys/types.h>
+#include "libgfortran.h"
+
+#include <limits.h>
+
+#if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
+#  include <sys/time.h>
+#  define TCK 1000
+#elif defined(HAVE_TIME_H)
+#  include <time.h>
+#  define TCK 1
+#else
+#define TCK 0
+#endif
+
+
+#if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
+static struct timeval tp0 = {-1, 0};
+#elif defined(HAVE_TIME_H)
+static time_t t0 = (time_t) -2;
+#endif
+
+/* prefix(system_clock_4) is the INTEGER(4) version of the SYSTEM_CLOCK
+   intrinsic subroutine.  It returns the number of clock ticks for the current
+   system time, the number of ticks per second, and the maximum possible value
+   for COUNT.  On the first call to SYSTEM_CLOCK, COUNT is set to zero. */
+
+void
+prefix(system_clock_4)(GFC_INTEGER_4 *count, GFC_INTEGER_4 *count_rate,
+		       GFC_INTEGER_4 *count_max)
+{
+  GFC_INTEGER_4 cnt;
+  GFC_INTEGER_4 rate;
+  GFC_INTEGER_4 mx;
+
+#if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
+  struct timeval tp1;
+  struct timezone tzp;
+  double t;
+
+  if (gettimeofday(&tp1, &tzp) == 0)
+    {
+      if (tp0.tv_sec < 0)
+        {
+          tp0 = tp1;
+          cnt = 0;
+        }
+      else
+        {
+	  /* TODO: Convert this to integer arithmetic.  */
+          t  = (double) (tp1.tv_sec  - tp0.tv_sec);
+          t += (double) (tp1.tv_usec - tp0.tv_usec) * 1.e-6;
+          t *= TCK;
+
+          if (t > (double) GFC_INTEGER_4_HUGE)
+            {
+              /* Time has wrapped. */
+              while (t > (double) GFC_INTEGER_4_HUGE)
+                t -= (double) GFC_INTEGER_4_HUGE;
+              tp0 = tp1;
+            }
+	  cnt = (GFC_INTEGER_4) t;
+        }
+      rate = TCK;
+      mx = GFC_INTEGER_4_HUGE;
+    }
+  else
+    {
+      if (count != NULL) *count = - GFC_INTEGER_4_HUGE;
+      if (count_rate != NULL) *count_rate = 0;
+      if (count_max != NULL) *count_max = 0;
+    }
+#elif defined(HAVE_TIME_H)
+  time_t t, t1;
+
+  t1 = time(NULL);
+
+  if (t1 == (time_t) -1)
+    {
+      cnt = - GFC_INTEGER_4_HUGE;
+      mx = 0;
+    }
+  else if (t0 == (time_t) -2) 
+    t0 = t1;
+  else
+    {
+      /* The timer counts in seconts, so for simplicity assume it never wraps.
+	 Even with 32-bit counters this only happens once every 68 years.  */
+      cnt = t1 - t0;
+      mx = GFC_INTEGER_4_HUGE;
+    }
+#else
+  cnt = - GFC_INTEGER_4_HUGE;
+  mx = 0;
+#endif
+  if (count != NULL) *count = cnt;
+  if (count_rate != NULL) *count_rate = TCK;
+  if (count_max != NULL) *count_max = mx;
+}
+
+
+/* INTEGER(8) version of the above routine.  */
+
+void
+prefix(system_clock_8)(GFC_INTEGER_8 *count, GFC_INTEGER_8 *count_rate,
+		       GFC_INTEGER_8 *count_max)
+{
+  GFC_INTEGER_8 cnt;
+  GFC_INTEGER_8 rate;
+  GFC_INTEGER_8 mx;
+
+#if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
+  struct timeval tp1;
+  struct timezone tzp;
+  double t;
+
+  if (gettimeofday(&tp1, &tzp) == 0)
+    {
+      if (tp0.tv_sec < 0)
+        {
+          tp0 = tp1;
+          cnt = 0;
+        }
+      else
+        {
+	  /* TODO: Convert this to integer arithmetic.  */
+          t  = (double) (tp1.tv_sec  - tp0.tv_sec);
+          t += (double) (tp1.tv_usec - tp0.tv_usec) * 1.e-6;
+          t *= TCK;
+
+          if (t > (double) GFC_INTEGER_8_HUGE)
+            {
+              /* Time has wrapped. */
+              while (t > (double) GFC_INTEGER_8_HUGE)
+                t -= (double) GFC_INTEGER_8_HUGE;
+              tp0 = tp1;
+            }
+	  cnt = (GFC_INTEGER_8) t;
+        }
+      rate = TCK;
+      mx = GFC_INTEGER_8_HUGE;
+    }
+  else
+    {
+      if (count != NULL) *count = - GFC_INTEGER_8_HUGE;
+      if (count_rate != NULL) *count_rate = 0;
+      if (count_max != NULL) *count_max = 0;
+    }
+#elif defined(HAVE_TIME_H)
+  time_t t, t1;
+
+  t1 = time(NULL);
+
+  if (t1 == (time_t) -1)
+    {
+      cnt = - GFC_INTEGER_8_HUGE;
+      mx = 0;
+    }
+  else if (t0 == (time_t) -2) 
+    t0 = t1;
+  else
+    {
+      /* The timer counts in seconts, so for simplicity assume it never wraps.
+	 Even with 32-bit counters this only happens once every 68 years.  */
+      cnt = t1 - t0;
+      mx = GFC_INTEGER_8_HUGE;
+    }
+#else
+  cnt = - GFC_INTEGER_8_HUGE;
+  mx = 0;
+#endif
+  if (count != NULL)
+    *count = cnt;
+  if (count_rate != NULL)
+    *count_rate = TCK;
+  if (count_max != NULL)
+    *count_max = mx;
+}
+