chromium/third_party/grpc/src/src/core/lib/gpr/posix/time.cc

//
//
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//

#include <grpc/support/port_platform.h>

#include "src/core/lib/gpr/time_precise.h"

#ifdef GPR_POSIX_TIME

#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#ifdef __linux__
#include <sys/syscall.h>
#endif
#include <grpc/support/atm.h>
#include <grpc/support/log.h>
#include <grpc/support/time.h>

#include "src/core/lib/gprpp/crash.h"

static struct timespec timespec_from_gpr(gpr_timespec gts) {}

#if _POSIX_TIMERS > 0 || defined(__OpenBSD__)
static gpr_timespec gpr_from_timespec(struct timespec ts,
                                      gpr_clock_type clock_type) {}

/// maps gpr_clock_type --> clockid_t for clock_gettime
static const clockid_t clockid_for_gpr_clock[] =;

void gpr_time_init(void) {}

static gpr_timespec now_impl(gpr_clock_type clock_type) {}
#else
// For some reason Apple's OSes haven't implemented clock_gettime.

#include <mach/mach.h>
#include <mach/mach_time.h>
#include <sys/time.h>

static double g_time_scale = []() {
  mach_timebase_info_data_t tb = {0, 1};
  mach_timebase_info(&tb);
  return static_cast<double>(tb.numer) / static_cast<double>(tb.denom);
}();
static uint64_t g_time_start = mach_absolute_time();

void gpr_time_init(void) { gpr_precise_clock_init(); }

static gpr_timespec now_impl(gpr_clock_type clock) {
  gpr_timespec now;
  struct timeval now_tv;
  double now_dbl;

  now.clock_type = clock;
  switch (clock) {
    case GPR_CLOCK_REALTIME:
      // gettimeofday(...) function may return with a value whose tv_usec is
      // greater than 1e6 on iOS The case is resolved with the guard at end of
      // this function.
      gettimeofday(&now_tv, nullptr);
      now.tv_sec = now_tv.tv_sec;
      now.tv_nsec = now_tv.tv_usec * 1000;
      break;
    case GPR_CLOCK_MONOTONIC:
      // Add 5 seconds arbitrarily: avoids weird conditions in gprpp/time.cc
      // when there's a small number of seconds returned.
      now_dbl = 5.0e9 +
                ((double)(mach_absolute_time() - g_time_start)) * g_time_scale;
      now.tv_sec = (int64_t)(now_dbl * 1e-9);
      now.tv_nsec = (int32_t)(now_dbl - ((double)now.tv_sec) * 1e9);
      break;
    case GPR_CLOCK_PRECISE:
      gpr_precise_clock_now(&now);
      break;
    case GPR_TIMESPAN:
      abort();
  }

  // Guard the tv_nsec field in valid range for all clock types
  while (GPR_UNLIKELY(now.tv_nsec >= 1e9)) {
    now.tv_sec++;
    now.tv_nsec -= 1e9;
  }
  while (GPR_UNLIKELY(now.tv_nsec < 0)) {
    now.tv_sec--;
    now.tv_nsec += 1e9;
  }

  return now;
}
#endif

gpr_timespec (*gpr_now_impl)(gpr_clock_type clock_type) =;

gpr_timespec gpr_now(gpr_clock_type clock_type) {}

void gpr_sleep_until(gpr_timespec until) {}

#endif  // GPR_POSIX_TIME