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 <__availability> 13 #include <__config> 14 #include <__memory_resource/memory_resource.h> 15 #include <__memory_resource/pool_options.h> 16 #include <__memory_resource/unsynchronized_pool_resource.h> 17 #include <cstddef> 18 #include <mutex> 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 28 namespace pmr { 29 30 // [mem.res.pool.overview] 31 32 class _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI synchronized_pool_resource : public memory_resource { 33 public: 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 !defined(_LIBCPP_HAS_NO_THREADS) 54 unique_lock<mutex> __lk(__mut_); 55 # endif 56 __unsync_.release(); 57 } 58 59 _LIBCPP_HIDE_FROM_ABI memory_resource* upstream_resource() const { return __unsync_.upstream_resource(); } 60 61 _LIBCPP_HIDE_FROM_ABI pool_options options() const { return __unsync_.options(); } 62 63 protected: 64 _LIBCPP_HIDE_FROM_ABI_VIRTUAL void* do_allocate(size_t __bytes, size_t __align) override { 65 # if !defined(_LIBCPP_HAS_NO_THREADS) 66 unique_lock<mutex> __lk(__mut_); 67 # endif 68 return __unsync_.allocate(__bytes, __align); 69 } 70 71 _LIBCPP_HIDE_FROM_ABI_VIRTUAL void do_deallocate(void* __p, size_t __bytes, size_t __align) override { 72 # if !defined(_LIBCPP_HAS_NO_THREADS) 73 unique_lock<mutex> __lk(__mut_); 74 # endif 75 return __unsync_.deallocate(__p, __bytes, __align); 76 } 77 78 bool do_is_equal(const memory_resource& __other) const noexcept override; // key function 79 80 private: 81 # if !defined(_LIBCPP_HAS_NO_THREADS) 82 mutex __mut_; 83 # endif 84 unsynchronized_pool_resource __unsync_; 85 }; 86 87 } // namespace pmr 88 89 _LIBCPP_END_NAMESPACE_STD 90 91 #endif // _LIBCPP_STD_VER >= 17 92 93 #endif // _LIBCPP___MEMORY_RESOURCE_SYNCHRONIZED_POOL_RESOURCE_H 94