libgupc/smp/upc_tick.c

   1 /* Copyright (C) 2012-2014 Free Software Foundation, Inc.
   2    This file is part of the UPC runtime Library.
   3    Written by Gary Funck <gary@intrepid.com>
   4    and Nenad Vukicevic <nenad@intrepid.com>
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 3.1, as published by the Free Software Foundation.
  21
  22 You should have received a copy of the GNU General Public License and
  23 a copy of the GCC Runtime Library Exception along with this program;
  24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 <http://www.gnu.org/licenses/>.  */
  26
  27 #include "upc_config.h"
  28 #include "upc_sysdep.h"
  29 #include "upc_defs.h"
  30 #include "upc_lib.h"
  31
  32 #if HAVE_CLOCK_GETTIME
  33 #ifdef CLOCK_MONOTONIC_RAW
  34 /* System clock id passed to clock_gettime. CLOCK_MONOTONIC_RAW
  35    is preferred.  It has been available in the Linux kernel
  36    since version 2.6.28 */
  37 #define SYS_RT_CLOCK_ID CLOCK_MONOTONIC_RAW
  38 #else
  39 #define SYS_RT_CLOCK_ID CLOCK_MONOTONIC
  40 #endif
  41
  42 upc_tick_t
  43 upc_ticks_now (void)
  44 {
  45   struct timespec ts;
  46   upc_tick_t t;
  47   if (clock_gettime (SYS_RT_CLOCK_ID, &ts) != 0)
  48     {
  49       perror ("clock_gettime");
  50       abort ();
  51     }
  52   t = (upc_tick_t) ts.tv_sec * 1000000000LL + (upc_tick_t) ts.tv_nsec;
  53   return t;
  54 }
  55
  56 #else /* !HAVE_CLOCK_GETTIME */
  57
  58 upc_tick_t
  59 upc_ticks_now (void)
  60 {
  61   struct timeval tv;
  62   upc_tick_t t;
  63   if (gettimeofday (&tv, NULL) != 0)
  64     {
  65       perror ("gettimeofday");
  66       abort ();
  67     }
  68   t = (upc_tick_t) tv.tv_sec * 1000000000LL + (upc_tick_t) tv.tv_usec * 1000;
  69   return t;
  70 }
  71
  72 #endif
  73
  74 uint64_t
  75 upc_ticks_to_ns (upc_tick_t ticks)
  76 {
  77   return ticks;
  78 }