blob: 5473e886b80d2bf5eb9da07a928f400629f82f5c (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
// 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
//
// https://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 Y_ABSL_TIME_CLOCK_H_
#define Y_ABSL_TIME_CLOCK_H_
#include <cstdint>
#include "y_absl/base/config.h"
#include "y_absl/base/macros.h"
#include "y_absl/time/time.h"
namespace y_absl {
Y_ABSL_NAMESPACE_BEGIN
// Now()
//
// Returns the current time, expressed as an `y_absl::Time` absolute time value.
y_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 `y_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 `y_absl::Duration`.
//
// Notes:
// * Signal interruptions will not reduce the sleep duration.
// * Returns immediately when passed a nonpositive duration.
void SleepFor(y_absl::Duration duration);
Y_ABSL_NAMESPACE_END
} // namespace y_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" {
Y_ABSL_DLL void Y_ABSL_INTERNAL_C_SYMBOL(AbslInternalSleepFor)(
y_absl::Duration duration);
} // extern "C"
inline void y_absl::SleepFor(y_absl::Duration duration) {
Y_ABSL_INTERNAL_C_SYMBOL(AbslInternalSleepFor)(duration);
}
#endif // Y_ABSL_TIME_CLOCK_H_
|
