[all-commits] [llvm/llvm-project] badda4: [libc] Linux threads - Set CLEAR_TID addr to 0 whe...

[Siva Chandra via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: badda4ac3c489a8c8cccdad1f74b9308c350a9e0
      https://github.com/llvm/llvm-project/commit/badda4ac3c489a8c8cccdad1f74b9308c350a9e0
  Author: Siva Chandra Reddy <sivachandra at google.com>
  Date:   2022-07-11 (Mon, 11 Jul 2022)

  Changed paths:
    M libc/src/__support/threads/linux/thread.cpp

  Log Message:
  -----------
  [libc] Linux threads - Set CLEAR_TID addr to 0 when exiting a detached thread.

A detached thread cleans itself up at completion. So, the CLEAR_TID memory is
also gone by the time the kernel tries to signal potential waiters. By nulling
the CLEAR_TID address, we prevent the kernel from signalling at a non-existent
futex location.