| 1 | //===---------- GPU implementation of the clock_gettime function ----------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/time/clock_gettime.h" |
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| 10 | |
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| 11 | #include "src/__support/common.h" |
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| 12 | #include "src/__support/macros/config.h" |
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| 13 | #include "src/__support/time/clock_gettime.h" |
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| 14 | #include "src/__support/time/gpu/time_utils.h" |
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| 15 | |
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| 16 | namespace LIBC_NAMESPACE_DECL { |
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| 17 | namespace internal { |
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| 18 | constexpr uint64_t TICKS_PER_SEC = 1000000000UL; |
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| 19 | |
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| 20 | ErrorOr<int> clock_gettime(clockid_t clockid, timespec *ts) { |
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| 21 | if (clockid != CLOCK_MONOTONIC || !ts) |
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| 22 | return cpp::unexpected(-1); |
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| 23 | |
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| 24 | uint64_t ns_per_tick = TICKS_PER_SEC / GPU_CLOCKS_PER_SEC; |
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| 25 | uint64_t ticks = gpu::fixed_frequency_clock(); |
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| 26 | |
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| 27 | ts->tv_nsec = (ticks * ns_per_tick) % TICKS_PER_SEC; |
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| 28 | ts->tv_sec = (ticks * ns_per_tick) / TICKS_PER_SEC; |
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| 29 | |
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| 30 | return 0; |
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| 31 | } |
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| 32 | } // namespace internal |
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| 33 | } // namespace LIBC_NAMESPACE_DECL |
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| 34 | |
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