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/* Copyright (C) 1995, 1996 Free Software Foundation, Inc.
This file is part of GNU Fortran libU77 library.
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published
by the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
GNU Fortran 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with GNU Fortran; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <sys/types.h>
#if HAVE_SYS_TIMES_H
# include <sys/times.h>
#endif
#if HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#if HAVE_GETRUSAGE
# include <sys/time.h>
# include <sys/resource.h>
#endif
#if defined (_WIN32)
# include <windows.h>
# undef min
# undef max
#endif
#include <errno.h> /* for ENOSYS */
#include "f2c.h"
/* For dtime, etime we store the clock tick parameter (clk_tck) the
first time either of them is invoked rather than each time. This
approach probably speeds up each invocation by avoiding a system
call each time, but means that the overhead of the first call is
different to all others. */
static long clk_tck = 0;
#ifdef KR_headers
double G77_etime_0 (tarray)
real tarray[2];
#else
double G77_etime_0 (real tarray[2])
#endif
{
#if defined (_WIN32)
static int win32_platform = -1;
double usertime, systime;
if (win32_platform == -1)
{
OSVERSIONINFO osv;
osv.dwOSVersionInfoSize = sizeof (osv);
GetVersionEx (&osv);
win32_platform = osv.dwPlatformId;
}
/* non-NT platforms don't have a clue as to how long a process has
been running, so simply return the uptime. Bad judgement call? */
if (win32_platform != VER_PLATFORM_WIN32_NT)
{
static unsigned long long clock_freq;
static unsigned long long old_count;
unsigned long long count;
LARGE_INTEGER counter_val;
if (clock_freq == 0)
{
LARGE_INTEGER freq;
if (! QueryPerformanceFrequency (&freq))
{
errno = ENOSYS;
return 0.0;
}
else
{
clock_freq = ((unsigned long long) freq.HighPart << 32)
+ ((unsigned) freq.LowPart);
if (! QueryPerformanceCounter (&counter_val))
return -1.0;
old_count = ((unsigned long long) counter_val.HighPart << 32)
+ (unsigned) counter_val.LowPart;
}
}
if (! QueryPerformanceCounter (&counter_val))
return -1.0;
count = ((unsigned long long) counter_val.HighPart << 32)
+ (unsigned) counter_val.LowPart;
tarray[0] = usertime = (double) (count - old_count) / clock_freq;
tarray[1] = systime = 0.0;
}
else
{
FILETIME creation_time, exit_time, kernel_time, user_time;
unsigned long long utime, stime;
GetProcessTimes (GetCurrentProcess (), &creation_time, &exit_time,
&kernel_time, &user_time);
utime = ((unsigned long long) user_time.dwHighDateTime << 32)
+ (unsigned) user_time.dwLowDateTime;
stime = ((unsigned long long) kernel_time.dwHighDateTime << 32)
+ (unsigned) kernel_time.dwLowDateTime;
tarray[0] = usertime = utime / 1.0e7;
tarray[1] = systime = stime / 1.0e7;
}
return usertime + systime;
#elif defined (HAVE_GETRUSAGE) || defined (HAVE_TIMES)
/* The getrusage version is only the default for convenience. */
#ifdef HAVE_GETRUSAGE
struct rusage rbuff;
if (getrusage (RUSAGE_SELF, &rbuff) != 0)
abort ();
tarray[0] = ((float) (rbuff.ru_utime).tv_sec +
(float) (rbuff.ru_utime).tv_usec/1000000.0);
tarray[1] = ((float) (rbuff.ru_stime).tv_sec +
(float) (rbuff.ru_stime).tv_usec/1000000.0);
#else /* HAVE_GETRUSAGE */
struct tms buffer;
/* NeXTStep seems to define _SC_CLK_TCK but not to have sysconf;
fixme: does using _POSIX_VERSION help? */
# if defined _SC_CLK_TCK && defined _POSIX_VERSION
if (! clk_tck) clk_tck = sysconf(_SC_CLK_TCK);
# elif defined CLOCKS_PER_SECOND
if (! clk_tck) clk_tck = CLOCKS_PER_SECOND;
# elif defined CLK_TCK
if (! clk_tck) clk_tck = CLK_TCK;
# elif defined HZ
if (! clk_tck) clk_tck = HZ;
# elif defined HAVE_GETRUSAGE
# else
#error Dont know clock tick length
# endif
if (times(&buffer) == (clock_t)-1) return -1.0;
tarray[0] = (float) buffer.tms_utime / (float)clk_tck;
tarray[1] = (float) buffer.tms_stime / (float)clk_tck;
#endif /* HAVE_GETRUSAGE */
return (tarray[0]+tarray[1]);
#else /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
errno = ENOSYS;
return 0.0;
#endif /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
}
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