1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___MEMORY_RESOURCE_SYNCHRONIZED_POOL_RESOURCE_H
10#define _LIBCPP___MEMORY_RESOURCE_SYNCHRONIZED_POOL_RESOURCE_H
11
12#include <__config>
13#include <__memory_resource/memory_resource.h>
14#include <__memory_resource/pool_options.h>
15#include <__memory_resource/unsynchronized_pool_resource.h>
16#include <cstddef>
17#if !defined(_LIBCPP_HAS_NO_THREADS)
18#  include <mutex>
19#endif
20
21#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
22#  pragma GCC system_header
23#endif
24
25#if _LIBCPP_STD_VER > 14
26
27_LIBCPP_BEGIN_NAMESPACE_STD
28
29namespace pmr {
30
31// [mem.res.pool.overview]
32
33class _LIBCPP_TYPE_VIS synchronized_pool_resource : public memory_resource {
34public:
35  _LIBCPP_HIDE_FROM_ABI synchronized_pool_resource(const pool_options& __opts, memory_resource* __upstream)
36      : __unsync_(__opts, __upstream) {}
37
38  _LIBCPP_HIDE_FROM_ABI synchronized_pool_resource()
39      : synchronized_pool_resource(pool_options(), get_default_resource()) {}
40
41  _LIBCPP_HIDE_FROM_ABI explicit synchronized_pool_resource(memory_resource* __upstream)
42      : synchronized_pool_resource(pool_options(), __upstream) {}
43
44  _LIBCPP_HIDE_FROM_ABI explicit synchronized_pool_resource(const pool_options& __opts)
45      : synchronized_pool_resource(__opts, get_default_resource()) {}
46
47  synchronized_pool_resource(const synchronized_pool_resource&) = delete;
48
49  ~synchronized_pool_resource() override = default;
50
51  synchronized_pool_resource& operator=(const synchronized_pool_resource&) = delete;
52
53  _LIBCPP_HIDE_FROM_ABI void release() {
54#  if !defined(_LIBCPP_HAS_NO_THREADS)
55    unique_lock<mutex> __lk(__mut_);
56#  endif
57    __unsync_.release();
58  }
59
60  _LIBCPP_HIDE_FROM_ABI memory_resource* upstream_resource() const { return __unsync_.upstream_resource(); }
61
62  _LIBCPP_HIDE_FROM_ABI pool_options options() const { return __unsync_.options(); }
63
64protected:
65  _LIBCPP_HIDE_FROM_ABI_VIRTUAL void* do_allocate(size_t __bytes, size_t __align) override {
66#  if !defined(_LIBCPP_HAS_NO_THREADS)
67    unique_lock<mutex> __lk(__mut_);
68#  endif
69    return __unsync_.allocate(__bytes, __align);
70  }
71
72  _LIBCPP_HIDE_FROM_ABI_VIRTUAL void do_deallocate(void* __p, size_t __bytes, size_t __align) override {
73#  if !defined(_LIBCPP_HAS_NO_THREADS)
74    unique_lock<mutex> __lk(__mut_);
75#  endif
76    return __unsync_.deallocate(__p, __bytes, __align);
77  }
78
79  bool do_is_equal(const memory_resource& __other) const noexcept override; // key function
80
81private:
82#  if !defined(_LIBCPP_HAS_NO_THREADS)
83  mutex __mut_;
84#  endif
85  unsynchronized_pool_resource __unsync_;
86};
87
88} // namespace pmr
89
90_LIBCPP_END_NAMESPACE_STD
91
92#endif // _LIBCPP_STD_VER > 14
93
94#endif // _LIBCPP___MEMORY_RESOURCE_SYNCHRONIZED_POOL_RESOURCE_H
95