[libcxx-commits] [libcxx] [libc++][In progress] Floating Point Atomic (PR #67799)

[Louis Dionne via libcxx-commits]

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+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef TEST_STD_ATOMICS_ATOMICS_TYPES_FLOAT_TEST_HELPER_H
+#define TEST_STD_ATOMICS_ATOMICS_TYPES_FLOAT_TEST_HELPER_H
+
+#include <atomic>
+#include <cassert>
+#include <thread>
+#include <vector>
+
+// Test that all threads see the exact same sequence of events
+// Test will pass 100% if store_op and load_op are correctly
+// affecting the memory with seq_cst order
+template <class T, template <class> class MaybeVolatile, class StoreOp, class LoadOp>
+void test_seq_cst(StoreOp store_op, LoadOp load_op) {
+  for (int i = 0; i < 100; ++i) {
+    T old_value = 0.0;
+    T new_value = 1.0;
+
+    MaybeVolatile<std::atomic<T>> x(old_value);
+    MaybeVolatile<std::atomic<T>> y(old_value);
+
+    std::atomic_bool x_update_first(false);
+    std::atomic_bool y_update_first(false);
+
+    std::thread t1([&] { store_op(x, old_value, new_value); });
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ldionne wrote:

`make_test_thread`!

https://github.com/llvm/llvm-project/pull/67799