75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
// Copyright 2017 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// -----------------------------------------------------------------------------
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// File: clock.h
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// -----------------------------------------------------------------------------
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//
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// This header file contains utility functions for working with the system-wide
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// realtime clock. For descriptions of the main time abstractions used within
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// this header file, consult the time.h header file.
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#ifndef ABSL_TIME_CLOCK_H_
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#define ABSL_TIME_CLOCK_H_
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#include "absl/base/macros.h"
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#include "absl/time/time.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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// Now()
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//
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// Returns the current time, expressed as an `absl::Time` absolute time value.
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absl::Time Now();
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// GetCurrentTimeNanos()
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//
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// Returns the current time, expressed as a count of nanoseconds since the Unix
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// Epoch (https://en.wikipedia.org/wiki/Unix_time). Prefer `absl::Now()` instead
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// for all but the most performance-sensitive cases (i.e. when you are calling
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// this function hundreds of thousands of times per second).
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int64_t GetCurrentTimeNanos();
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// SleepFor()
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//
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// Sleeps for the specified duration, expressed as an `absl::Duration`.
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//
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// Notes:
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// * Signal interruptions will not reduce the sleep duration.
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// * Returns immediately when passed a nonpositive duration.
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void SleepFor(absl::Duration duration);
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ABSL_NAMESPACE_END
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} // namespace absl
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// -----------------------------------------------------------------------------
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// Implementation Details
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// -----------------------------------------------------------------------------
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// In some build configurations we pass --detect-odr-violations to the
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// gold linker. This causes it to flag weak symbol overrides as ODR
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// violations. Because ODR only applies to C++ and not C,
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// --detect-odr-violations ignores symbols not mangled with C++ names.
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// By changing our extension points to be extern "C", we dodge this
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// check.
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extern "C" {
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void ABSL_INTERNAL_C_SYMBOL(AbslInternalSleepFor)(absl::Duration duration);
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} // extern "C"
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inline void absl::SleepFor(absl::Duration duration) {
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ABSL_INTERNAL_C_SYMBOL(AbslInternalSleepFor)(duration);
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}
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#endif // ABSL_TIME_CLOCK_H_
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