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     1  /* Copyright 2016 The Roughtime Authors.
     2   *
     3   * Licensed under the Apache License, Version 2.0 (the "License");
     4   * you may not use this file except in compliance with the License.
     5   * You may obtain a copy of the License at
     6   *
     7   *   http://www.apache.org/licenses/LICENSE-2.0
     8   *
     9   * Unless required by applicable law or agreed to in writing, software
    10   * distributed under the License is distributed on an "AS IS" BASIS,
    11   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12   * See the License for the specific language governing permissions and
    13   * limitations under the License. */
    14  
    15  
    16  #if defined(__APPLE__)
    17  
    18  #include <mach/clock.h>
    19  #include <mach/mach.h>
    20  #include <stdint.h>
    21  #include <stdlib.h>
    22  #include <time.h>
    23  
    24  namespace roughtime {
    25  
    26  // TimeUs returns the current value of the specified clock in microseconds.
    27  static uint64_t TimeUs(clock_id_t clock) {
    28    clock_serv_t clock_ref;
    29    mach_timespec_t tv;
    30  
    31    if (host_get_clock_service(mach_host_self(), clock, &clock_ref) !=
    32            KERN_SUCCESS ||
    33        clock_get_time(clock_ref, &tv) != KERN_SUCCESS ||
    34        mach_port_deallocate(mach_task_self(), clock_ref) != KERN_SUCCESS) {
    35      abort();
    36    }
    37  
    38    uint64_t ret = tv.tv_sec;
    39    ret *= 1000000;
    40    ret += tv.tv_nsec / 1000;
    41    return ret;
    42  }
    43  
    44  // MonotonicUs returns the value of the monotonic clock in microseconds.
    45  uint64_t MonotonicUs() { return TimeUs(REALTIME_CLOCK); }
    46  
    47  // MonotonicUs returns the value of the realtime clock in microseconds.
    48  uint64_t RealtimeUs() { return TimeUs(CALENDAR_CLOCK); }
    49  
    50  }  // namespace roughtime
    51  
    52  #endif  // __linux