mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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96f95b9f95
* result: try out some experimental shenanigans * result: sketch out some more shenanigans * result: see what it looks like to convert kernel to use result conds instead of guards * make rest of kernel use experimental new macro-ing
218 lines
9 KiB
C++
218 lines
9 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <vapours.hpp>
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#include <stratosphere/tipc/tipc_common.hpp>
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#include <stratosphere/tipc/tipc_service_object.hpp>
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#include <stratosphere/tipc/tipc_object_holder.hpp>
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namespace ams::tipc {
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/* TODO: Put this in a better header. */
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constexpr inline u16 MethodId_Invalid = 0x0;
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constexpr inline u16 MethodId_CloseSession = 0xF;
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class ObjectManagerBase {
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protected:
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struct Entry {
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util::TypedStorage<ObjectHolder> object;
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os::MultiWaitHolderType multi_wait_holder;
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};
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private:
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os::SdkMutex m_mutex{};
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Entry *m_entries_start{};
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Entry *m_entries_end{};
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os::MultiWaitType *m_multi_wait{};
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private:
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Entry *FindEntry(os::NativeHandle handle) {
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for (Entry *cur = m_entries_start; cur != m_entries_end; ++cur) {
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if (GetReference(cur->object).GetHandle() == handle) {
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return cur;
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}
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}
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return nullptr;
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}
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Entry *FindEntry(os::MultiWaitHolderType *holder) {
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for (Entry *cur = m_entries_start; cur != m_entries_end; ++cur) {
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if (std::addressof(cur->multi_wait_holder) == holder) {
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return cur;
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}
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}
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return nullptr;
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}
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public:
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constexpr ObjectManagerBase() = default;
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void InitializeImpl(os::MultiWaitType *multi_wait, Entry *entries, size_t max_objects) {
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/* Set our multi wait. */
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m_multi_wait = multi_wait;
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/* Setup entry pointers. */
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m_entries_start = entries;
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m_entries_end = entries + max_objects;
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/* Construct all entries. */
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for (size_t i = 0; i < max_objects; ++i) {
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util::ConstructAt(m_entries_start[i].object);
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}
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}
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void AddObject(ObjectHolder &object) {
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/* Lock ourselves. */
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std::scoped_lock lk(m_mutex);
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/* Find an empty entry. */
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auto *entry = this->FindEntry(os::InvalidNativeHandle);
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AMS_ABORT_UNLESS(entry != nullptr);
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/* Set the entry's object. */
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GetReference(entry->object) = object;
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/* Setup the entry's holder. */
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os::InitializeMultiWaitHolder(std::addressof(entry->multi_wait_holder), object.GetHandle());
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os::LinkMultiWaitHolder(m_multi_wait, std::addressof(entry->multi_wait_holder));
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}
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void CloseObject(os::NativeHandle handle) {
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/* Lock ourselves. */
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std::scoped_lock lk(m_mutex);
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/* Find the matching entry. */
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auto *entry = this->FindEntry(handle);
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AMS_ABORT_UNLESS(entry != nullptr);
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/* Finalize the entry's holder. */
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os::UnlinkMultiWaitHolder(std::addressof(entry->multi_wait_holder));
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os::FinalizeMultiWaitHolder(std::addressof(entry->multi_wait_holder));
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/* Destroy the object. */
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GetReference(entry->object).Destroy();
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}
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Result ReplyAndReceive(os::MultiWaitHolderType **out_holder, ObjectHolder *out_object, os::NativeHandle reply_target, os::MultiWaitType *multi_wait) {
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/* Declare signaled holder for processing ahead of time. */
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os::MultiWaitHolderType *signaled_holder;
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/* Reply and receive until we get a newly signaled target. */
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Result result = os::SdkReplyAndReceive(out_holder, reply_target, multi_wait);
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for (signaled_holder = *out_holder; signaled_holder == nullptr; signaled_holder = *out_holder) {
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result = os::SdkReplyAndReceive(out_holder, os::InvalidNativeHandle, multi_wait);
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}
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/* Find the entry matching the signaled holder. */
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if (auto *entry = this->FindEntry(signaled_holder); entry != nullptr) {
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/* Get the output object. */
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*out_object = GetReference(entry->object);
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*out_holder = nullptr;
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return result;
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} else {
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return ResultSuccess();
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}
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}
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void Reply(os::NativeHandle reply_target) {
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/* Perform the reply. */
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s32 dummy;
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R_TRY_CATCH(svc::ReplyAndReceive(std::addressof(dummy), nullptr, 0, reply_target, 0)) {
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R_CATCH(svc::ResultTimedOut) {
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/* Timing out is acceptable. */
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}
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R_CATCH(svc::ResultSessionClosed) {
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/* It's okay if we couldn't reply to a closed session. */
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}
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} R_END_TRY_CATCH_WITH_ABORT_UNLESS;
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}
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Result ProcessRequest(ObjectHolder &object) {
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/* Get the message buffer. */
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const svc::ipc::MessageBuffer message_buffer(svc::ipc::GetMessageBuffer());
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/* Get the method id. */
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const auto method_id = svc::ipc::MessageBuffer::MessageHeader(message_buffer).GetTag();
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/* Process for the method id. */
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{
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/* Ensure that if we fail, we clean up any handles that get sent our way. */
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ON_RESULT_FAILURE {
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const svc::ipc::MessageBuffer::MessageHeader message_header(message_buffer);
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const svc::ipc::MessageBuffer::SpecialHeader special_header(message_buffer, message_header);
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/* Determine the offset to the start of handles. */
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auto offset = message_buffer.GetSpecialDataIndex(message_header, special_header);
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if (special_header.GetHasProcessId()) {
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offset += sizeof(u64) / sizeof(u32);
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}
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/* Close all copy handles. */
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for (auto i = 0; i < special_header.GetCopyHandleCount(); ++i) {
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svc::CloseHandle(message_buffer.GetHandle(offset));
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offset += sizeof(ams::svc::Handle) / sizeof(u32);
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}
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};
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/* Check that the method id is valid. */
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R_UNLESS(method_id != MethodId_Invalid, tipc::ResultInvalidMethod());
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/* Process the request. */
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if (method_id != MethodId_CloseSession) {
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/* Process the generic method for the object. */
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R_TRY(object.GetObject()->ProcessRequest());
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} else {
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/* Validate that the close request is of valid format. */
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using CloseSessionCommandMeta = impl::CommandMetaInfo<MethodId_CloseSession, std::tuple<>>;
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using CloseSessionProcessor = impl::CommandProcessor<CloseSessionCommandMeta>;
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R_TRY(CloseSessionProcessor::ValidateCommandFormat(message_buffer));
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}
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}
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/* If we were asked to close the object, do so. */
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if (method_id == MethodId_CloseSession) {
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/* Get the object handle. */
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const auto handle = object.GetHandle();
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/* Close the object itself. */
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this->CloseObject(handle);
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/* Close the object's handle. */
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/* NOTE: Nintendo does not check that this succeeds. */
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R_ABORT_UNLESS(svc::CloseHandle(handle));
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/* Return an error to signify we closed the object. */
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R_THROW(tipc::ResultSessionClosed());
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}
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/* We successfully processed, so we don't need to clean up handles. */
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R_SUCCEED();
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}
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};
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template<size_t MaxObjects>
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class ObjectManager : public ObjectManagerBase {
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private:
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Entry m_entries_storage[MaxObjects]{};
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public:
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constexpr ObjectManager() = default;
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void Initialize(os::MultiWaitType *multi_wait) {
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this->InitializeImpl(multi_wait, m_entries_storage, MaxObjects);
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}
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};
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}
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