231 lines
6.1 KiB
C
231 lines
6.1 KiB
C
/* Implementation of the SYSTEM_CLOCK intrinsic.
|
|
Copyright (C) 2004-2021 Free Software Foundation, Inc.
|
|
|
|
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 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.
|
|
|
|
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 "libgfortran.h"
|
|
|
|
#include <limits.h>
|
|
|
|
#include "time_1.h"
|
|
|
|
|
|
#if !defined(__MINGW32__)
|
|
|
|
/* POSIX states that CLOCK_REALTIME must be present if clock_gettime
|
|
is available, others are optional. */
|
|
#if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_CLOCK_GETTIME_LIBRT)
|
|
#if defined(CLOCK_MONOTONIC) && defined(_POSIX_MONOTONIC_CLOCK) \
|
|
&& _POSIX_MONOTONIC_CLOCK >= 0
|
|
#define GF_CLOCK_MONOTONIC CLOCK_MONOTONIC
|
|
#else
|
|
#define GF_CLOCK_MONOTONIC CLOCK_REALTIME
|
|
#endif
|
|
#endif
|
|
|
|
/* Weakref trickery for clock_gettime(). On Glibc <= 2.16,
|
|
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. */
|
|
#if SUPPORTS_WEAKREF && defined(HAVE_CLOCK_GETTIME_LIBRT)
|
|
static int weak_gettime (clockid_t, struct timespec *)
|
|
__attribute__((__weakref__("clock_gettime")));
|
|
#endif
|
|
|
|
|
|
/* High resolution monotonic clock, falling back to the realtime clock
|
|
if the target does not support such a clock.
|
|
|
|
Arguments:
|
|
secs - OUTPUT, seconds
|
|
fracsecs - OUTPUT, fractional seconds, units given by tk argument
|
|
tk - OUTPUT, clock resolution [counts/sec]
|
|
|
|
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 int
|
|
gf_gettime_mono (time_t * secs, long * fracsecs, long * tck)
|
|
{
|
|
int err;
|
|
#ifdef HAVE_CLOCK_GETTIME
|
|
struct timespec ts;
|
|
*tck = 1000000000;
|
|
err = clock_gettime (GF_CLOCK_MONOTONIC, &ts);
|
|
*secs = ts.tv_sec;
|
|
*fracsecs = ts.tv_nsec;
|
|
return err;
|
|
#else
|
|
#if SUPPORTS_WEAKREF && defined(HAVE_CLOCK_GETTIME_LIBRT)
|
|
if (weak_gettime)
|
|
{
|
|
struct timespec ts;
|
|
*tck = 1000000000;
|
|
err = weak_gettime (GF_CLOCK_MONOTONIC, &ts);
|
|
*secs = ts.tv_sec;
|
|
*fracsecs = ts.tv_nsec;
|
|
return err;
|
|
}
|
|
#endif
|
|
*tck = 1000000;
|
|
err = gf_gettime (secs, fracsecs);
|
|
return err;
|
|
#endif
|
|
}
|
|
|
|
#endif /* !__MINGW32__ */
|
|
|
|
extern void
|
|
system_clock_4 (GFC_INTEGER_4 *count, GFC_INTEGER_4 *count_rate,
|
|
GFC_INTEGER_4 *count_max);
|
|
export_proto(system_clock_4);
|
|
|
|
extern void
|
|
system_clock_8 (GFC_INTEGER_8 *count, GFC_INTEGER_8 *count_rate,
|
|
GFC_INTEGER_8 *count_max);
|
|
export_proto(system_clock_8);
|
|
|
|
|
|
/* 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. */
|
|
|
|
void
|
|
system_clock_4 (GFC_INTEGER_4 *count, GFC_INTEGER_4 *count_rate,
|
|
GFC_INTEGER_4 *count_max)
|
|
{
|
|
#if defined(__MINGW32__)
|
|
if (count)
|
|
{
|
|
/* Use GetTickCount here as the resolution and range is
|
|
sufficient for the INTEGER(kind=4) version, and
|
|
QueryPerformanceCounter has potential issues. */
|
|
uint32_t cnt = GetTickCount ();
|
|
if (cnt > GFC_INTEGER_4_HUGE)
|
|
cnt = cnt - GFC_INTEGER_4_HUGE - 1;
|
|
*count = cnt;
|
|
}
|
|
if (count_rate)
|
|
*count_rate = 1000;
|
|
if (count_max)
|
|
*count_max = GFC_INTEGER_4_HUGE;
|
|
#else
|
|
time_t secs;
|
|
long fracsecs, tck;
|
|
|
|
if (gf_gettime_mono (&secs, &fracsecs, &tck) == 0)
|
|
{
|
|
long tck_out = tck > 1000 ? 1000 : tck;
|
|
long tck_r = tck / tck_out;
|
|
GFC_UINTEGER_4 ucnt = (GFC_UINTEGER_4) secs * tck_out;
|
|
ucnt += fracsecs / tck_r;
|
|
if (ucnt > GFC_INTEGER_4_HUGE)
|
|
ucnt = ucnt - GFC_INTEGER_4_HUGE - 1;
|
|
if (count)
|
|
*count = ucnt;
|
|
if (count_rate)
|
|
*count_rate = tck_out;
|
|
if (count_max)
|
|
*count_max = GFC_INTEGER_4_HUGE;
|
|
}
|
|
else
|
|
{
|
|
if (count)
|
|
*count = - GFC_INTEGER_4_HUGE;
|
|
if (count_rate)
|
|
*count_rate = 0;
|
|
if (count_max)
|
|
*count_max = 0;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
/* INTEGER(8) version of the above routine. */
|
|
|
|
void
|
|
system_clock_8 (GFC_INTEGER_8 *count, GFC_INTEGER_8 *count_rate,
|
|
GFC_INTEGER_8 *count_max)
|
|
{
|
|
#if defined(__MINGW32__)
|
|
LARGE_INTEGER cnt;
|
|
LARGE_INTEGER freq;
|
|
bool fail = false;
|
|
if (count && !QueryPerformanceCounter (&cnt))
|
|
fail = true;
|
|
if (count_rate && !QueryPerformanceFrequency (&freq))
|
|
fail = true;
|
|
if (fail)
|
|
{
|
|
if (count)
|
|
*count = - GFC_INTEGER_8_HUGE;
|
|
if (count_rate)
|
|
*count_rate = 0;
|
|
if (count_max)
|
|
*count_max = 0;
|
|
}
|
|
else
|
|
{
|
|
if (count)
|
|
*count = cnt.QuadPart;
|
|
if (count_rate)
|
|
*count_rate = freq.QuadPart;
|
|
if (count_max)
|
|
*count_max = GFC_INTEGER_8_HUGE;
|
|
}
|
|
#else
|
|
time_t secs;
|
|
long fracsecs, tck;
|
|
|
|
if (gf_gettime_mono (&secs, &fracsecs, &tck) == 0)
|
|
{
|
|
GFC_UINTEGER_8 ucnt = (GFC_UINTEGER_8) secs * tck;
|
|
ucnt += fracsecs;
|
|
if (ucnt > GFC_INTEGER_8_HUGE)
|
|
ucnt = ucnt - GFC_INTEGER_8_HUGE - 1;
|
|
if (count)
|
|
*count = ucnt;
|
|
if (count_rate)
|
|
*count_rate = tck;
|
|
if (count_max)
|
|
*count_max = GFC_INTEGER_8_HUGE;
|
|
}
|
|
else
|
|
{
|
|
if (count)
|
|
*count = - GFC_INTEGER_8_HUGE;
|
|
if (count_rate)
|
|
*count_rate = 0;
|
|
if (count_max)
|
|
*count_max = 0;
|
|
}
|
|
#endif
|
|
}
|