1 files changed, 94 insertions, 0 deletions
diff --git a/libcxx/include/__memory_resource/synchronized_pool_resource.h b/libcxx/include/__memory_resource/synchronized_pool_resource.h
new file mode 100644
index 000000000000..1877147ca16f
--- /dev/null
+++ b/libcxx/include/__memory_resource/synchronized_pool_resource.h
@@ -0,0 +1,94 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 _LIBCPP___MEMORY_RESOURCE_SYNCHRONIZED_POOL_RESOURCE_H
+#define _LIBCPP___MEMORY_RESOURCE_SYNCHRONIZED_POOL_RESOURCE_H
+
+#include <__config>
+#include <__memory_resource/memory_resource.h>
+#include <__memory_resource/pool_options.h>
+#include <__memory_resource/unsynchronized_pool_resource.h>
+#include <cstddef>
+#if !defined(_LIBCPP_HAS_NO_THREADS)
+#  include <mutex>
+#endif
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER > 14
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace pmr {
+
+// [mem.res.pool.overview]
+
+class _LIBCPP_TYPE_VIS synchronized_pool_resource : public memory_resource {
+public:
+  _LIBCPP_HIDE_FROM_ABI synchronized_pool_resource(const pool_options& __opts, memory_resource* __upstream)
+      : __unsync_(__opts, __upstream) {}
+
+  _LIBCPP_HIDE_FROM_ABI synchronized_pool_resource()
+      : synchronized_pool_resource(pool_options(), get_default_resource()) {}
+
+  _LIBCPP_HIDE_FROM_ABI explicit synchronized_pool_resource(memory_resource* __upstream)
+      : synchronized_pool_resource(pool_options(), __upstream) {}
+
+  _LIBCPP_HIDE_FROM_ABI explicit synchronized_pool_resource(const pool_options& __opts)
+      : synchronized_pool_resource(__opts, get_default_resource()) {}
+
+  synchronized_pool_resource(const synchronized_pool_resource&) = delete;
+
+  ~synchronized_pool_resource() override = default;
+
+  synchronized_pool_resource& operator=(const synchronized_pool_resource&) = delete;
+
+  _LIBCPP_HIDE_FROM_ABI void release() {
+#  if !defined(_LIBCPP_HAS_NO_THREADS)
+    unique_lock<mutex> __lk(__mut_);
+#  endif
+    __unsync_.release();
+  }
+
+  _LIBCPP_HIDE_FROM_ABI memory_resource* upstream_resource() const { return __unsync_.upstream_resource(); }
+
+  _LIBCPP_HIDE_FROM_ABI pool_options options() const { return __unsync_.options(); }
+
+protected:
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL void* do_allocate(size_t __bytes, size_t __align) override {
+#  if !defined(_LIBCPP_HAS_NO_THREADS)
+    unique_lock<mutex> __lk(__mut_);
+#  endif
+    return __unsync_.allocate(__bytes, __align);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL void do_deallocate(void* __p, size_t __bytes, size_t __align) override {
+#  if !defined(_LIBCPP_HAS_NO_THREADS)
+    unique_lock<mutex> __lk(__mut_);
+#  endif
+    return __unsync_.deallocate(__p, __bytes, __align);
+  }
+
+  bool do_is_equal(const memory_resource& __other) const noexcept override; // key function
+
+private:
+#  if !defined(_LIBCPP_HAS_NO_THREADS)
+  mutex __mut_;
+#  endif
+  unsynchronized_pool_resource __unsync_;
+};
+
+} // namespace pmr
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER > 14
+
+#endif // _LIBCPP___MEMORY_RESOURCE_SYNCHRONIZED_POOL_RESOURCE_H