63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
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/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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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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* http://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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#include <folly/portability/SysTime.h>
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#ifdef _WIN32
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#include <cstdint>
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extern "C" {
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int gettimeofday(timeval* tv, struct timezone*) {
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constexpr auto posixWinFtOffset = 116444736000000000ULL;
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if (tv) {
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FILETIME ft;
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ULARGE_INTEGER lft;
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GetSystemTimeAsFileTime(&ft);
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// As per the docs of FILETIME, don't just do an indirect
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// pointer cast, to avoid alignment faults.
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lft.HighPart = ft.dwHighDateTime;
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lft.LowPart = ft.dwLowDateTime;
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uint64_t ns = lft.QuadPart;
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tv->tv_usec = (long)((ns / 10ULL) % 1000000ULL);
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tv->tv_sec = (long)((ns - posixWinFtOffset) / 10000000ULL);
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}
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return 0;
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}
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void timeradd(timeval* a, timeval* b, timeval* res) {
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res->tv_sec = a->tv_sec + b->tv_sec;
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res->tv_usec = a->tv_usec + b->tv_usec;
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if (res->tv_usec >= 1000000) {
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res->tv_sec++;
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res->tv_usec -= 1000000;
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}
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}
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void timersub(timeval* a, timeval* b, timeval* res) {
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res->tv_sec = a->tv_sec - b->tv_sec;
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res->tv_usec = a->tv_usec - b->tv_usec;
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if (res->tv_usec < 0) {
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res->tv_sec--;
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res->tv_usec += 1000000;
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}
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}
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}
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#endif
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