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Diffstat (limited to 'contrib/libf2c/libU77/etime_.c')
-rw-r--r-- | contrib/libf2c/libU77/etime_.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/contrib/libf2c/libU77/etime_.c b/contrib/libf2c/libU77/etime_.c new file mode 100644 index 000000000000..269d964c75b0 --- /dev/null +++ b/contrib/libf2c/libU77/etime_.c @@ -0,0 +1,90 @@ +/* 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 +#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 (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) < 0) 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 */ +} |