[all-commits] [llvm/llvm-project] 8393ea: [libc] Implement `clock_gettime` for the monotonic...

[Joseph Huber via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8393ea5d1dd8e8b56a87a6edbca31fb8722cee48
      https://github.com/llvm/llvm-project/commit/8393ea5d1dd8e8b56a87a6edbca31fb8722cee48
  Author: Joseph Huber <huberjn at outlook.com>
  Date:   2024-07-16 (Tue, 16 Jul 2024)

  Changed paths:
    M libc/config/gpu/entrypoints.txt
    M libc/docs/gpu/support.rst
    M libc/include/llvm-libc-macros/gpu/time-macros.h
    M libc/include/time.h.def
    M libc/src/time/gpu/CMakeLists.txt
    A libc/src/time/gpu/clock_gettime.cpp
    M libc/test/src/time/CMakeLists.txt
    M libc/test/src/time/clock_gettime_test.cpp

  Log Message:
  -----------
  [libc] Implement `clock_gettime` for the monotonic clock on the GPU (#99067)

Summary:
This patch implements `clock_gettime` using the monotonic clock. This
allows users to get time elapsed at nanosecond resolution. This is
primarily to facilitate compiling the `chrono` library from `libc++`.
For this reason we provide both `CLOCK_MONOTONIC`, which we can
implement
with the GPU's global fixed-frequency clock, and `CLOCK_REALTIME` which
we cannot. The latter is provided just to make people who use this
header happy and it will always return failure.



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