34 lines · cpp
1//===---------- GPU implementation of the clock_gettime function ----------===//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-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/time/clock_gettime.h"10 11#include "src/__support/common.h"12#include "src/__support/macros/config.h"13#include "src/__support/time/clock_gettime.h"14#include "src/__support/time/gpu/time_utils.h"15 16namespace LIBC_NAMESPACE_DECL {17namespace internal {18constexpr uint64_t TICKS_PER_SEC = 1000000000UL;19 20ErrorOr<int> clock_gettime(clockid_t clockid, timespec *ts) {21 if (clockid != CLOCK_MONOTONIC || !ts)22 return cpp::unexpected(-1);23 24 uint64_t ns_per_tick = TICKS_PER_SEC / GPU_CLOCKS_PER_SEC;25 uint64_t ticks = gpu::fixed_frequency_clock();26 27 ts->tv_nsec = (ticks * ns_per_tick) % TICKS_PER_SEC;28 ts->tv_sec = (ticks * ns_per_tick) / TICKS_PER_SEC;29 30 return 0;31}32} // namespace internal33} // namespace LIBC_NAMESPACE_DECL34