| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172 | // Copyright 2017 The Abseil 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.//// -----------------------------------------------------------------------------// File: clock.h// -----------------------------------------------------------------------------//// This header file contains utility functions for working with the system-wide// realtime clock. For descriptions of the main time abstractions used within// this header file, consult the time.h header file.#ifndef ABSL_TIME_CLOCK_H_#define ABSL_TIME_CLOCK_H_#include "absl/base/macros.h"#include "absl/time/time.h"namespace absl {// Now()//// Returns the current time, expressed as an `absl::Time` absolute time value.absl::Time Now();// GetCurrentTimeNanos()//// Returns the current time, expressed as a count of nanoseconds since the Unix// Epoch (https://en.wikipedia.org/wiki/Unix_time). Prefer `absl::Now()` instead// for all but the most performance-sensitive cases (i.e. when you are calling// this function hundreds of thousands of times per second).int64_t GetCurrentTimeNanos();// SleepFor()//// Sleeps for the specified duration, expressed as an `absl::Duration`.//// Notes:// * Signal interruptions will not reduce the sleep duration.// * Returns immediately when passed a nonpositive duration.void SleepFor(absl::Duration duration);}  // namespace absl// -----------------------------------------------------------------------------// Implementation Details// -----------------------------------------------------------------------------// In some build configurations we pass --detect-odr-violations to the// gold linker.  This causes it to flag weak symbol overrides as ODR// violations.  Because ODR only applies to C++ and not C,// --detect-odr-violations ignores symbols not mangled with C++ names.// By changing our extension points to be extern "C", we dodge this// check.extern "C" {void AbslInternalSleepFor(absl::Duration duration);}  // extern "C"inline void absl::SleepFor(absl::Duration duration) {  AbslInternalSleepFor(duration);}#endif  // ABSL_TIME_CLOCK_H_
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