[libcxx-commits] [libcxx] [libc++] Refactor the predicate taking variant of `__cxx_atomic_wait` (PR #80596)

[Louis Dionne via libcxx-commits]

Jan =?utf-8?q?Kokemüller?= <jan.kokemueller at gmail.com>,
Jan =?utf-8?q?Kokemüller?= <jan.kokemueller at gmail.com>,
Jan =?utf-8?q?Kokemüller?= <jan.kokemueller at gmail.com>,
Jan =?utf-8?q?Kokemüller?= <jan.kokemueller at gmail.com>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/80596 at github.com>


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@@ -43,15 +56,40 @@ __libcpp_atomic_monitor(__cxx_atomic_contention_t const volatile*);
 _LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void
 __libcpp_atomic_wait(__cxx_atomic_contention_t const volatile*, __cxx_contention_t);
 
-template <class _Atp, class _BackoffTest>
+template <class _Atp, class _Poll>
 struct __libcpp_atomic_wait_backoff_impl {
   _Atp* __a_;
-  _BackoffTest __backoff_test_;
+  _Poll __poll_;
+  memory_order __order_;
+
+  _LIBCPP_AVAILABILITY_SYNC
+  _LIBCPP_HIDE_FROM_ABI bool
+  __poll_or_get_monitor(__cxx_atomic_contention_t const volatile*, __cxx_contention_t& __monitor) const {
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ldionne wrote:

IIUC, this is roughly what @huixie90 is transforming into a CPO in #81427 .

https://github.com/llvm/llvm-project/pull/80596