utils/clock_interface.cc

// This file is a copy of google3/absl/time/clock_interface.cc
// Will not be used in G3 build, only in gBMC environment.
// TODO: (b/482207765) - Remove this file once absl version in gBMC environment
// includes this file.

#include "utils/clock_interface.h"

#include "absl/base/config.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/base/no_destructor.h"
#include "absl/synchronization/mutex.h"
#include "absl/time/clock.h"
#include "absl/time/time.h"

namespace absl {

namespace {

class RealTimeClock final : public Clock {
 private:
#ifdef _MSC_VER
  // Disable MSVC warning "destructor never returns, potential memory leak"
#pragma warning(push)
#pragma warning(disable : 4722)
#endif
  ~RealTimeClock() override {
    ABSL_RAW_LOG(FATAL, "RealTimeClock should never be destroyed");
  }
#ifdef _MSC_VER
#pragma warning(pop)
#endif

 public:
  absl::Time TimeNow() override { return absl::Now(); }

  void Sleep(absl::Duration d) override { absl::SleepFor(d); }

  void SleepUntil(absl::Time wakeup_time) override {
    absl::Duration d = wakeup_time - TimeNow();
    if (d > absl::ZeroDuration()) {
      Sleep(d);
    }
  }

  bool AwaitWithDeadline(absl::Mutex* mu, const absl::Condition& cond,
                         absl::Time deadline) override {
    return mu->AwaitWithDeadline(cond, deadline);
  }
};

}  // namespace

Clock::~Clock() = default;  // go/key-method

Clock& Clock::GetRealClock() {
  static absl::NoDestructor<RealTimeClock> rtclock;
  return *rtclock;
}

}  // namespace absl