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 #include <lttng/core.h>
  28
  29 /* TRACE CLOCK */
  30
  31 /*
  32  * Currently using the kernel MONOTONIC clock, waiting for kernel-side
  33  * LTTng to implement mmap'd trace clock.
  34  */
  35
  36 /* Choosing correct trace clock */
  37
  38 static __inline__ uint64_t trace_clock_read64(void)
  39 {
  40         struct timespec ts;
  41
  42         clock_gettime(CLOCK_MONOTONIC, &ts);
  43         return (ts.tv_sec * 1000000000) + ts.tv_nsec;
  44 }
  45
  46 #if __i386__ || __x86_64__
  47 static __inline__ uint64_t trace_clock_frequency(void)
  48 {
  49         return 1000000000LL;
  50 }
  51 #endif /* #else #if __i386__ || __x86_64__ */
  52
  53 static __inline__ uint32_t trace_clock_freq_scale(void)
  54 {
  55         return 1;
  56 }
  57
  58 #endif /* _UST_CLOCK_H */