[all-commits] [llvm/llvm-project] 6e22b5: [libc++] Fix `std::atomic::wait` ulock wait UL_COM...

[Hui via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6e22b538da4b09efb10a59582a3f43d8128ae7d1
      https://github.com/llvm/llvm-project/commit/6e22b538da4b09efb10a59582a3f43d8128ae7d1
  Author: Hui <hui.xie1990 at gmail.com>
  Date:   2024-06-01 (Sat, 01 Jun 2024)

  Changed paths:
    M libcxx/src/atomic.cpp
    A libcxx/test/libcxx/atomics/atomics.syn/wait.pass.cpp

  Log Message:
  -----------
  [libc++] Fix `std::atomic::wait` ulock wait UL_COMPARE_AND_WAIT64 (#92783)

in `atomic::wait`, when we call the platform wait ulock_wait , we are
using UL_COMPARE_AND_WAIT. But we should use UL_COMPARE_AND_WAIT64
instead as the address we are waiting for is a 64 bit integer.

fixes https://github.com/llvm/llvm-project/issues/85107

It is rather hard to test directly because in `atomic::wait`, before
calling into the platform wait, our c++ code has some poll logic which
checks the value not changing. Thus in this patch, the test is using the
internal function.



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