/* Implementation of the SYSTEM_CLOCK intrinsic.
- Copyright (C) 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2004, 2005, 2007, 2009, 2010, 2011 Free Software
+ Foundation, Inc.
-This file is part of the GNU Fortran 95 runtime library (libgfortran).
+This file is part of the GNU Fortran runtime library (libgfortran).
Libgfortran is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
-version 2 of the License, or (at your option) any later version.
-
-In addition to the permissions in the GNU General Public License, the
-Free Software Foundation gives you unlimited permission to link the
-compiled version of this file into combinations with other programs,
-and to distribute those combinations without any restriction coming
-from the use of this file. (The General Public License restrictions
-do apply in other respects; for example, they cover modification of
-the file, and distribution when not linked into a combine
-executable.)
+version 3 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 General Public License for more details.
-You should have received a copy of the GNU General Public
-License along with libgfortran; see the file COPYING. If not,
-write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-Boston, MA 02110-1301, USA. */
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
-#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
+#include "time_1.h"
+
+#ifdef HAVE_CLOCK_GETTIME
+/* POSIX states that CLOCK_REALTIME must be present if clock_gettime
+ is available, others are optional. */
+#ifdef CLOCK_MONOTONIC
+#define GF_CLOCK_MONOTONIC CLOCK_MONOTONIC
+#else
+#define GF_CLOCK_MONOTONIC CLOCK_REALTIME
+#endif
+
+/* Weakref trickery for clock_gettime(). On Glibc, clock_gettime()
+ requires us to link in librt, which also pulls in libpthread. In
+ order to avoid this by default, only call clock_gettime() through a
+ weak reference.
+
+ Some targets don't support weak undefined references; on these
+ GTHREAD_USE_WEAK is 0. So we need to define it to 1 on other
+ targets. */
+#ifndef GTHREAD_USE_WEAK
+#define GTHREAD_USE_WEAK 1
+#endif
+
+#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
+static int weak_gettime (clockid_t, struct timespec *)
+ __attribute__((__weakref__("clock_gettime")));
#else
-#define TCK 0
+static inline int weak_gettime (clockid_t clk_id, struct timespec *res)
+{
+ return clock_gettime (clk_id, res);
+}
+#endif
#endif
+/* High resolution monotonic clock, falling back to the realtime clock
+ if the target does not support such a clock.
+
+ Arguments:
+ secs - OUTPUT, seconds
+ nanosecs - OUTPUT, nanoseconds
+
+ If the target supports a monotonic clock, the OUTPUT arguments
+ represent a monotonically incrementing clock starting from some
+ unspecified time in the past.
+
+ If a monotonic clock is not available, falls back to the realtime
+ clock which is not monotonic.
+
+ Return value: 0 for success, -1 for error. In case of error, errno
+ is set.
+*/
+static inline int
+gf_gettime_mono (time_t * secs, long * nanosecs)
+{
+ int err;
+#ifdef HAVE_CLOCK_GETTIME
+ if (weak_gettime)
+ {
+ struct timespec ts;
+ err = weak_gettime (GF_CLOCK_MONOTONIC, &ts);
+ *secs = ts.tv_sec;
+ *nanosecs = ts.tv_nsec;
+ return err;
+ }
+#endif
+ err = gf_gettime (secs, nanosecs);
+ *nanosecs *= 1000;
+ return err;
+}
+
extern void system_clock_4 (GFC_INTEGER_4 *, GFC_INTEGER_4 *, GFC_INTEGER_4 *);
export_proto(system_clock_4);
system_clock_4(GFC_INTEGER_4 *count, GFC_INTEGER_4 *count_rate,
GFC_INTEGER_4 *count_max)
{
+#undef TCK
+#define TCK 1000
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;
+ time_t secs;
+ long nanosecs;
- if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_4))
- internal_error (NULL, "tv_sec too small");
+ if (sizeof (secs) < sizeof (GFC_INTEGER_4))
+ internal_error (NULL, "secs too small");
- if (gettimeofday(&tp1, &tzp) == 0)
+ if (gf_gettime_mono (&secs, &nanosecs) == 0)
{
- GFC_UINTEGER_4 ucnt = (GFC_UINTEGER_4) tp1.tv_sec * TCK;
- ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
+ GFC_UINTEGER_4 ucnt = (GFC_UINTEGER_4) secs * TCK;
+ ucnt += (nanosecs + 500000000 / TCK) / (1000000000 / TCK);
if (ucnt > GFC_INTEGER_4_HUGE)
cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
else
cnt = ucnt;
- rate = TCK;
mx = GFC_INTEGER_4_HUGE;
}
else
*count_max = 0;
return;
}
-#elif defined(HAVE_TIME_H)
- GFC_UINTEGER_4 ucnt;
-
- if (sizeof (time_t) < sizeof (GFC_INTEGER_4))
- internal_error (NULL, "time_t too small");
- ucnt = time (NULL);
- if (ucnt > GFC_INTEGER_4_HUGE)
- cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
- else
- cnt = ucnt;
- mx = GFC_INTEGER_4_HUGE;
-#else
- cnt = - GFC_INTEGER_4_HUGE;
- mx = 0;
-#endif
if (count != NULL)
*count = cnt;
if (count_rate != NULL)
system_clock_8 (GFC_INTEGER_8 *count, GFC_INTEGER_8 *count_rate,
GFC_INTEGER_8 *count_max)
{
+#undef TCK
+#define TCK 1000000000
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;
+ time_t secs;
+ long nanosecs;
- if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_4))
- internal_error (NULL, "tv_sec too small");
+ if (sizeof (secs) < sizeof (GFC_INTEGER_4))
+ internal_error (NULL, "secs too small");
- if (gettimeofday(&tp1, &tzp) == 0)
+ if (gf_gettime_mono (&secs, &nanosecs) == 0)
{
- if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_8))
- {
- GFC_UINTEGER_4 ucnt = (GFC_UINTEGER_4) tp1.tv_sec * TCK;
- ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
- if (ucnt > GFC_INTEGER_4_HUGE)
- cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
- else
- cnt = ucnt;
- mx = GFC_INTEGER_4_HUGE;
- }
+ GFC_UINTEGER_8 ucnt = (GFC_UINTEGER_8) secs * TCK;
+ ucnt += (nanosecs + 500000000 / TCK) / (1000000000 / TCK);
+ if (ucnt > GFC_INTEGER_8_HUGE)
+ cnt = ucnt - GFC_INTEGER_8_HUGE - 1;
else
- {
- GFC_UINTEGER_8 ucnt = (GFC_UINTEGER_8) tp1.tv_sec * TCK;
- ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
- if (ucnt > GFC_INTEGER_8_HUGE)
- cnt = ucnt - GFC_INTEGER_8_HUGE - 1;
- else
- cnt = ucnt;
- mx = GFC_INTEGER_8_HUGE;
- }
- rate = TCK;
+ cnt = ucnt;
+ mx = GFC_INTEGER_8_HUGE;
}
else
{
return;
}
-#elif defined(HAVE_TIME_H)
- if (sizeof (time_t) < sizeof (GFC_INTEGER_4))
- internal_error (NULL, "time_t too small");
- else if (sizeof (time_t) == sizeof (GFC_INTEGER_4))
- {
- GFC_UINTEGER_4 ucnt = time (NULL);
- if (ucnt > GFC_INTEGER_4_HUGE)
- cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
- else
- cnt = ucnt;
- mx = GFC_INTEGER_4_HUGE;
- }
- else
- {
- GFC_UINTEGER_8 ucnt = time (NULL);
- if (ucnt > GFC_INTEGER_8_HUGE)
- cnt = ucnt - GFC_INTEGER_8_HUGE - 1;
- else
- cnt = ucnt;
- mx = GFC_INTEGER_8_HUGE;
- }
-#else
- cnt = - GFC_INTEGER_8_HUGE;
- mx = 0;
-#endif
+
if (count != NULL)
*count = cnt;
if (count_rate != NULL)
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