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 <__cstddef/size_t.h>
14#include <__memory_resource/memory_resource.h>
15#include <__memory_resource/pool_options.h>
16#include <__memory_resource/unsynchronized_pool_resource.h>
17#include <__mutex/mutex.h>
18#include <__mutex/unique_lock.h>
19
20#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
21# pragma GCC system_header
22#endif
23
24#if _LIBCPP_STD_VER >= 17
25
26_LIBCPP_BEGIN_NAMESPACE_STD
27
28namespace pmr {
29
30// [mem.res.pool.overview]
31
32class _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI synchronized_pool_resource : public memory_resource {
33public:
34 _LIBCPP_HIDE_FROM_ABI synchronized_pool_resource(const pool_options& __opts, memory_resource* __upstream)
35 : __unsync_(__opts, __upstream) {}
36
37 _LIBCPP_HIDE_FROM_ABI synchronized_pool_resource()
38 : synchronized_pool_resource(pool_options(), get_default_resource()) {}
39
40 _LIBCPP_HIDE_FROM_ABI explicit synchronized_pool_resource(memory_resource* __upstream)
41 : synchronized_pool_resource(pool_options(), __upstream) {}
42
43 _LIBCPP_HIDE_FROM_ABI explicit synchronized_pool_resource(const pool_options& __opts)
44 : synchronized_pool_resource(__opts, get_default_resource()) {}
45
46 synchronized_pool_resource(const synchronized_pool_resource&) = delete;
47
48 _LIBCPP_HIDE_FROM_ABI_VIRTUAL ~synchronized_pool_resource() override = default;
49
50 synchronized_pool_resource& operator=(const synchronized_pool_resource&) = delete;
51
52 _LIBCPP_HIDE_FROM_ABI void release() {
53# if _LIBCPP_HAS_THREADS
54 unique_lock<mutex> __lk(__mut_);
55# endif
56 __unsync_.release();
57 }
58
59 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI memory_resource* upstream_resource() const {
60 return __unsync_.upstream_resource();
61 }
62
63 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI pool_options options() const { return __unsync_.options(); }
64
65protected:
66 _LIBCPP_HIDE_FROM_ABI_VIRTUAL void* do_allocate(size_t __bytes, size_t __align) override {
67# if _LIBCPP_HAS_THREADS
68 unique_lock<mutex> __lk(__mut_);
69# endif
70 return __unsync_.allocate(__bytes, __align);
71 }
72
73 _LIBCPP_HIDE_FROM_ABI_VIRTUAL void do_deallocate(void* __p, size_t __bytes, size_t __align) override {
74# if _LIBCPP_HAS_THREADS
75 unique_lock<mutex> __lk(__mut_);
76# endif
77 return __unsync_.deallocate(__p, __bytes, __align);
78 }
79
80 bool do_is_equal(const memory_resource& __other) const noexcept override; // key function
81
82private:
83# if _LIBCPP_HAS_THREADS
84 mutex __mut_;
85# endif
86 unsynchronized_pool_resource __unsync_;
87};
88
89} // namespace pmr
90
91_LIBCPP_END_NAMESPACE_STD
92
93#endif // _LIBCPP_STD_VER >= 17
94
95#endif // _LIBCPP___MEMORY_RESOURCE_SYNCHRONIZED_POOL_RESOURCE_H