| // Copyright 2021 gRPC authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include <grpc/support/port_platform.h> |
| |
| #include <stdint.h> |
| #include <stdlib.h> |
| |
| #include <memory> |
| #include <new> |
| #include <utility> |
| |
| #include <grpc/event_engine/memory_allocator.h> |
| #include <grpc/event_engine/memory_request.h> |
| #include <grpc/slice.h> |
| |
| #include "src/core/lib/slice/slice_refcount_base.h" |
| |
| namespace grpc_event_engine { |
| namespace experimental { |
| |
| namespace { |
| |
| // Reference count for a slice allocated by MemoryAllocator::MakeSlice. |
| // Takes care of releasing memory back when the slice is destroyed. |
| class SliceRefCount : public grpc_slice_refcount { |
| public: |
| SliceRefCount(std::shared_ptr<internal::MemoryAllocatorImpl> allocator, |
| size_t size) |
| : grpc_slice_refcount(Destroy), |
| allocator_(std::move(allocator)), |
| size_(size) { |
| // Nothing to do here. |
| } |
| ~SliceRefCount() { allocator_->Release(size_); } |
| |
| private: |
| static void Destroy(grpc_slice_refcount* p) { |
| auto* rc = static_cast<SliceRefCount*>(p); |
| rc->~SliceRefCount(); |
| free(rc); |
| } |
| |
| std::shared_ptr<internal::MemoryAllocatorImpl> allocator_; |
| size_t size_; |
| }; |
| |
| } // namespace |
| |
| grpc_slice MemoryAllocator::MakeSlice(MemoryRequest request) { |
| auto size = Reserve(request.Increase(sizeof(SliceRefCount))); |
| void* p = malloc(size); |
| new (p) SliceRefCount(allocator_, size); |
| grpc_slice slice; |
| slice.refcount = static_cast<SliceRefCount*>(p); |
| slice.data.refcounted.bytes = |
| static_cast<uint8_t*>(p) + sizeof(SliceRefCount); |
| slice.data.refcounted.length = size - sizeof(SliceRefCount); |
| return slice; |
| } |
| |
| } // namespace experimental |
| } // namespace grpc_event_engine |