[OpenACC] Implement 'device_type' for 'data' construct
[llvm-project.git] / libc / src / __support / time / linux / clock_conversion.h
blobac5357d308d7c54f3c62d2c1a778deffc4e11928
1 //===--- clock conversion linux implementation ------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
9 #ifndef LLVM_LIBC_SRC___SUPPORT_TIME_LINUX_CLOCK_CONVERSION_H
10 #define LLVM_LIBC_SRC___SUPPORT_TIME_LINUX_CLOCK_CONVERSION_H
12 #include "src/__support/macros/config.h"
13 #include "src/__support/time/clock_gettime.h"
14 #include "src/__support/time/units.h"
16 namespace LIBC_NAMESPACE_DECL {
17 namespace internal {
19 LIBC_INLINE timespec convert_clock(timespec input, clockid_t from,
20 clockid_t to) {
21 using namespace time_units;
22 timespec from_time;
23 timespec to_time;
24 timespec output;
25 internal::clock_gettime(from, &from_time);
26 internal::clock_gettime(to, &to_time);
27 output.tv_sec = input.tv_sec - from_time.tv_sec + to_time.tv_sec;
28 output.tv_nsec = input.tv_nsec - from_time.tv_nsec + to_time.tv_nsec;
30 if (output.tv_nsec > 1_s_ns) {
31 output.tv_sec++;
32 output.tv_nsec -= 1_s_ns;
33 } else if (output.tv_nsec < 0) {
34 output.tv_sec--;
35 output.tv_nsec += 1_s_ns;
37 return output;
40 } // namespace internal
41 } // namespace LIBC_NAMESPACE_DECL
43 #endif // LLVM_LIBC_SRC___SUPPORT_TIME_LINUX_CLOCK_CONVERSION_H