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 //===----------------------------------------------------------------------===// 8 9 #ifndef LLVM_LIBC_SRC___SUPPORT_TIME_LINUX_CLOCK_CONVERSION_H 10 #define LLVM_LIBC_SRC___SUPPORT_TIME_LINUX_CLOCK_CONVERSION_H 11 12 #include "src/__support/time/linux/clock_gettime.h" 13 #include "src/__support/time/units.h" 14 15 namespace LIBC_NAMESPACE { 16 namespace internal { 17 convert_clock(timespec input,clockid_t from,clockid_t to)18LIBC_INLINE timespec convert_clock(timespec input, clockid_t from, 19 clockid_t to) { 20 using namespace time_units; 21 timespec from_time; 22 timespec to_time; 23 timespec output; 24 internal::clock_gettime(from, &from_time); 25 internal::clock_gettime(to, &to_time); 26 output.tv_sec = input.tv_sec - from_time.tv_sec + to_time.tv_sec; 27 output.tv_nsec = input.tv_nsec - from_time.tv_nsec + to_time.tv_nsec; 28 29 if (output.tv_nsec > 1_s_ns) { 30 output.tv_sec++; 31 output.tv_nsec -= 1_s_ns; 32 } else if (output.tv_nsec < 0) { 33 output.tv_sec--; 34 output.tv_nsec += 1_s_ns; 35 } 36 return output; 37 } 38 39 } // namespace internal 40 } // namespace LIBC_NAMESPACE 41 42 #endif // LLVM_LIBC_SRC___SUPPORT_TIME_LINUX_CLOCK_CONVERSION_H 43