src/dawn/wire/InlineSharedMemoryManager.cpp

// Copyright 2026 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "src/dawn/wire/InlineSharedMemoryManager.h"

#include <memory>
#include <utility>

#include "src/dawn/common/Ref.h"
#include "src/utils/platform.h"

namespace dawn::wire {

SharedMemory::SharedMemory(SystemHandle handle, Span<std::byte> data, uint64_t allocatedSize)
    : mHandle(std::move(handle)), mData(data), mAllocatedSize(allocatedSize) {}

SharedMemory::~SharedMemory() {}

InlineSharedMemoryManager::InlineSharedMemoryManager() = default;
InlineSharedMemoryManager::~InlineSharedMemoryManager() = default;

Ref<SharedMemory> InlineSharedMemoryManager::CreateSharedMemory(size_t) {
    return nullptr;
}

SharedMemoryID InlineSharedMemoryManager::PutOnWireAndGetID(SharedMemory* memory) {
    return mAllSharedMemoryOnWire.Use([&](auto allSharedMemoryOnWire) {
        SharedMemoryID id = allSharedMemoryOnWire->nextId++;
        allSharedMemoryOnWire->idToSharedMemory.emplace(id, memory);
        return id;
    });
}

Ref<SharedMemory> InlineSharedMemoryManager::AcquireFromWire(SharedMemoryID id) {
    return mAllSharedMemoryOnWire.Use([&](auto allSharedMemoryOnWire) {
        auto it = allSharedMemoryOnWire->idToSharedMemory.find(id);
        if (it == allSharedMemoryOnWire->idToSharedMemory.end()) {
            return Ref<SharedMemory>();
        }
        Ref<SharedMemory> memory = std::move(it->second);
        allSharedMemoryOnWire->idToSharedMemory.erase(it);
        return memory;
    });
}

#if !DAWN_PLATFORM_IS(WINDOWS)
std::shared_ptr<InlineSharedMemoryManager> CreateInlineSharedMemoryManager() {
    return std::make_shared<InlineSharedMemoryManager>();
}
#endif  // !DAWN_PLATFORM_IS(WINDOWS)

}  // namespace dawn::wire