[all-commits] [llvm/llvm-project] 82bddc: [libc] Mutex implementation for single-threaded ba...

[William Huynh via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 82bddc3e64e03ec4bb07ad9c757d2a06b5acb0c0
      https://github.com/llvm/llvm-project/commit/82bddc3e64e03ec4bb07ad9c757d2a06b5acb0c0
  Author: William Huynh <William.Huynh at arm.com>
  Date:   2025-07-31 (Thu, 31 Jul 2025)

  Changed paths:
    M libc/cmake/modules/LLVMLibCCompileOptionRules.cmake
    M libc/config/baremetal/config.json
    M libc/config/config.json
    M libc/config/gpu/amdgpu/config.json
    M libc/config/gpu/nvptx/config.json
    M libc/docs/configure.rst
    M libc/src/__support/threads/CMakeLists.txt
    R libc/src/__support/threads/gpu/CMakeLists.txt
    R libc/src/__support/threads/gpu/mutex.h
    M libc/src/__support/threads/mutex.h

  Log Message:
  -----------
  [libc] Mutex implementation for single-threaded baremetal (#145358)

Part of https://github.com/llvm/llvm-project/issues/145349. Required to
allow `atexit` to work. As part of `HermeticTestUtils.cpp`, there is a
reference to `atexit()`, which eventually instantiates an instance of a
Mutex.

Instead of copying the implementation from
`libc/src/__support/threads/gpu/mutex.h`, we allow platforms to select
an implementation based on configurations, allowing the GPU and
single-threaded baremetal platforms to share an implementation. This can
be configured or overridden.

Later, when the threading API is more complete, we can add an option to
support multithreading (or set it as the default), but having
single-threading (in tandem) is in line with other libraries for
embedded devices.



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