Abseil Common Libraries (C++) (grcp 依赖)
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74 lines
2.7 KiB
74 lines
2.7 KiB
// 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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