liblttng-ust/clock.h

   1 /*
   2  * Copyright (C) 2010  Pierre-Marc Fournier
   3  * Copyright (C) 2011  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; version 2.1 of
   8  * the License.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  18  */
  19
  20 #ifndef _UST_CLOCK_H
  21 #define _UST_CLOCK_H
  22
  23 #include <time.h>
  24 #include <sys/time.h>
  25 #include <stdint.h>
  26 #include <stddef.h>
  27
  28 /* TRACE CLOCK */
  29
  30 /*
  31  * Currently using the kernel MONOTONIC clock, waiting for kernel-side
  32  * LTTng to implement mmap'd trace clock.
  33  */
  34
  35 /* Choosing correct trace clock */
  36
  37 static __inline__
  38 uint64_t trace_clock_read64(void)
  39 {
  40         struct timespec ts;
  41
  42         clock_gettime(CLOCK_MONOTONIC, &ts);
  43         return ((uint64_t) ts.tv_sec * 1000000000ULL) + ts.tv_nsec;
  44 }
  45
  46 static __inline__
  47 uint64_t trace_clock_freq(void)
  48 {
  49         return 1000000000ULL;
  50 }
  51
  52 static __inline__
  53 const char *trace_clock_uuid(void)
  54 {
  55         return "CLOCK_MONOTONIC";
  56 }
  57
  58 #endif /* _UST_CLOCK_H */