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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <atomic>
#include <memory>
#include <mutex>
#include <utility>
#include "common/assert.h"
#include "common/logging/log.h"
#include "core/core.h"
#include "core/core_timing.h"
#include "core/hle/kernel/client_port.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/lock.h"
#include "core/hle/result.h"
namespace Kernel {
/**
* Callback that will wake up the thread it was scheduled for
* @param thread_handle The handle of the thread that's been awoken
* @param cycles_late The number of CPU cycles that have passed since the desired wakeup time
*/
static void ThreadWakeupCallback(u64 thread_handle, [[maybe_unused]] int cycles_late) {
const auto proper_handle = static_cast<Handle>(thread_handle);
const auto& system = Core::System::GetInstance();
// Lock the global kernel mutex when we enter the kernel HLE.
std::lock_guard<std::recursive_mutex> lock(HLE::g_hle_lock);
SharedPtr<Thread> thread =
system.Kernel().RetrieveThreadFromWakeupCallbackHandleTable(proper_handle);
if (thread == nullptr) {
LOG_CRITICAL(Kernel, "Callback fired for invalid thread {:08X}", proper_handle);
return;
}
bool resume = true;
if (thread->GetStatus() == ThreadStatus::WaitSynchAny ||
thread->GetStatus() == ThreadStatus::WaitSynchAll ||
thread->GetStatus() == ThreadStatus::WaitHLEEvent) {
// Remove the thread from each of its waiting objects' waitlists
for (const auto& object : thread->GetWaitObjects()) {
object->RemoveWaitingThread(thread.get());
}
thread->ClearWaitObjects();
// Invoke the wakeup callback before clearing the wait objects
if (thread->HasWakeupCallback()) {
resume = thread->InvokeWakeupCallback(ThreadWakeupReason::Timeout, thread, nullptr, 0);
}
}
if (thread->GetMutexWaitAddress() != 0 || thread->GetCondVarWaitAddress() != 0 ||
thread->GetWaitHandle() != 0) {
ASSERT(thread->GetStatus() == ThreadStatus::WaitMutex);
thread->SetMutexWaitAddress(0);
thread->SetCondVarWaitAddress(0);
thread->SetWaitHandle(0);
auto* const lock_owner = thread->GetLockOwner();
// Threads waking up by timeout from WaitProcessWideKey do not perform priority inheritance
// and don't have a lock owner unless SignalProcessWideKey was called first and the thread
// wasn't awakened due to the mutex already being acquired.
if (lock_owner != nullptr) {
lock_owner->RemoveMutexWaiter(thread);
}
}
if (thread->GetArbiterWaitAddress() != 0) {
ASSERT(thread->GetStatus() == ThreadStatus::WaitArb);
thread->SetArbiterWaitAddress(0);
}
if (resume) {
thread->ResumeFromWait();
}
}
struct KernelCore::Impl {
void Initialize(KernelCore& kernel) {
Shutdown();
InitializeSystemResourceLimit(kernel);
InitializeThreads();
}
void Shutdown() {
next_object_id = 0;
next_process_id = Process::ProcessIDMin;
next_thread_id = 1;
process_list.clear();
current_process = nullptr;
system_resource_limit = nullptr;
thread_wakeup_callback_handle_table.Clear();
thread_wakeup_event_type = nullptr;
named_ports.clear();
}
// Creates the default system resource limit
void InitializeSystemResourceLimit(KernelCore& kernel) {
system_resource_limit = ResourceLimit::Create(kernel, "System");
// If setting the default system values fails, then something seriously wrong has occurred.
ASSERT(system_resource_limit->SetLimitValue(ResourceType::PhysicalMemory, 0x200000000)
.IsSuccess());
ASSERT(system_resource_limit->SetLimitValue(ResourceType::Threads, 800).IsSuccess());
ASSERT(system_resource_limit->SetLimitValue(ResourceType::Events, 700).IsSuccess());
ASSERT(system_resource_limit->SetLimitValue(ResourceType::TransferMemory, 200).IsSuccess());
ASSERT(system_resource_limit->SetLimitValue(ResourceType::Sessions, 900).IsSuccess());
}
void InitializeThreads() {
thread_wakeup_event_type =
CoreTiming::RegisterEvent("ThreadWakeupCallback", ThreadWakeupCallback);
}
std::atomic<u32> next_object_id{0};
std::atomic<u64> next_process_id{Process::ProcessIDMin};
std::atomic<u64> next_thread_id{1};
// Lists all processes that exist in the current session.
std::vector<SharedPtr<Process>> process_list;
Process* current_process = nullptr;
SharedPtr<ResourceLimit> system_resource_limit;
CoreTiming::EventType* thread_wakeup_event_type = nullptr;
// TODO(yuriks): This can be removed if Thread objects are explicitly pooled in the future,
// allowing us to simply use a pool index or similar.
Kernel::HandleTable thread_wakeup_callback_handle_table;
/// Map of named ports managed by the kernel, which can be retrieved using
/// the ConnectToPort SVC.
NamedPortTable named_ports;
};
KernelCore::KernelCore() : impl{std::make_unique<Impl>()} {}
KernelCore::~KernelCore() {
Shutdown();
}
void KernelCore::Initialize() {
impl->Initialize(*this);
}
void KernelCore::Shutdown() {
impl->Shutdown();
}
SharedPtr<ResourceLimit> KernelCore::GetSystemResourceLimit() const {
return impl->system_resource_limit;
}
SharedPtr<Thread> KernelCore::RetrieveThreadFromWakeupCallbackHandleTable(Handle handle) const {
return impl->thread_wakeup_callback_handle_table.Get<Thread>(handle);
}
void KernelCore::AppendNewProcess(SharedPtr<Process> process) {
impl->process_list.push_back(std::move(process));
}
void KernelCore::MakeCurrentProcess(Process* process) {
impl->current_process = process;
}
Process* KernelCore::CurrentProcess() {
return impl->current_process;
}
const Process* KernelCore::CurrentProcess() const {
return impl->current_process;
}
void KernelCore::AddNamedPort(std::string name, SharedPtr<ClientPort> port) {
impl->named_ports.emplace(std::move(name), std::move(port));
}
KernelCore::NamedPortTable::iterator KernelCore::FindNamedPort(const std::string& name) {
return impl->named_ports.find(name);
}
KernelCore::NamedPortTable::const_iterator KernelCore::FindNamedPort(
const std::string& name) const {
return impl->named_ports.find(name);
}
bool KernelCore::IsValidNamedPort(NamedPortTable::const_iterator port) const {
return port != impl->named_ports.cend();
}
u32 KernelCore::CreateNewObjectID() {
return impl->next_object_id++;
}
u64 KernelCore::CreateNewThreadID() {
return impl->next_thread_id++;
}
u64 KernelCore::CreateNewProcessID() {
return impl->next_process_id++;
}
CoreTiming::EventType* KernelCore::ThreadWakeupCallbackEventType() const {
return impl->thread_wakeup_event_type;
}
Kernel::HandleTable& KernelCore::ThreadWakeupCallbackHandleTable() {
return impl->thread_wakeup_callback_handle_table;
}
const Kernel::HandleTable& KernelCore::ThreadWakeupCallbackHandleTable() const {
return impl->thread_wakeup_callback_handle_table;
}
} // namespace Kernel
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