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