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555 lines
19 KiB
C++
555 lines
19 KiB
C++
// Copyright 2014 Citra Emulator Project / PPSSPP Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <algorithm>
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#include <cinttypes>
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#include <optional>
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#include <vector>
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#include "common/assert.h"
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#include "common/common_types.h"
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#include "common/logging/log.h"
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#include "common/thread_queue_list.h"
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#include "core/arm/arm_interface.h"
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#include "core/core.h"
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#include "core/core_timing.h"
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#include "core/core_timing_util.h"
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#include "core/hardware_properties.h"
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#include "core/hle/kernel/errors.h"
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#include "core/hle/kernel/handle_table.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/kernel/object.h"
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#include "core/hle/kernel/process.h"
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#include "core/hle/kernel/scheduler.h"
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#include "core/hle/kernel/thread.h"
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#include "core/hle/result.h"
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#include "core/memory.h"
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namespace Kernel {
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bool Thread::ShouldWait(const Thread* thread) const {
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return status != ThreadStatus::Dead;
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}
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bool Thread::IsSignaled() const {
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return status == ThreadStatus::Dead;
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}
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void Thread::Acquire(Thread* thread) {
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ASSERT_MSG(!ShouldWait(thread), "object unavailable!");
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}
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Thread::Thread(KernelCore& kernel) : SynchronizationObject{kernel} {}
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Thread::~Thread() = default;
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void Thread::Stop() {
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// Cancel any outstanding wakeup events for this thread
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Core::System::GetInstance().CoreTiming().UnscheduleEvent(kernel.ThreadWakeupCallbackEventType(),
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global_handle);
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kernel.GlobalHandleTable().Close(global_handle);
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global_handle = 0;
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SetStatus(ThreadStatus::Dead);
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Signal();
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// Clean up any dangling references in objects that this thread was waiting for
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for (auto& wait_object : wait_objects) {
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wait_object->RemoveWaitingThread(SharedFrom(this));
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}
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wait_objects.clear();
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owner_process->UnregisterThread(this);
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// Mark the TLS slot in the thread's page as free.
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owner_process->FreeTLSRegion(tls_address);
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}
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void Thread::WakeAfterDelay(s64 nanoseconds) {
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// Don't schedule a wakeup if the thread wants to wait forever
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if (nanoseconds == -1)
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return;
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// This function might be called from any thread so we have to be cautious and use the
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// thread-safe version of ScheduleEvent.
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const s64 cycles = Core::Timing::nsToCycles(std::chrono::nanoseconds{nanoseconds});
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Core::System::GetInstance().CoreTiming().ScheduleEvent(
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cycles, kernel.ThreadWakeupCallbackEventType(), global_handle);
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}
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void Thread::CancelWakeupTimer() {
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Core::System::GetInstance().CoreTiming().UnscheduleEvent(kernel.ThreadWakeupCallbackEventType(),
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global_handle);
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}
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void Thread::ResumeFromWait() {
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ASSERT_MSG(wait_objects.empty(), "Thread is waking up while waiting for objects");
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switch (status) {
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case ThreadStatus::WaitSynch:
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case ThreadStatus::WaitHLEEvent:
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case ThreadStatus::WaitSleep:
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case ThreadStatus::WaitIPC:
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case ThreadStatus::WaitMutex:
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case ThreadStatus::WaitCondVar:
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case ThreadStatus::WaitArb:
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break;
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case ThreadStatus::Ready:
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// The thread's wakeup callback must have already been cleared when the thread was first
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// awoken.
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ASSERT(wakeup_callback == nullptr);
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// If the thread is waiting on multiple wait objects, it might be awoken more than once
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// before actually resuming. We can ignore subsequent wakeups if the thread status has
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// already been set to ThreadStatus::Ready.
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return;
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case ThreadStatus::Running:
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DEBUG_ASSERT_MSG(false, "Thread with object id {} has already resumed.", GetObjectId());
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return;
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case ThreadStatus::Dead:
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// This should never happen, as threads must complete before being stopped.
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DEBUG_ASSERT_MSG(false, "Thread with object id {} cannot be resumed because it's DEAD.",
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GetObjectId());
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return;
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}
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wakeup_callback = nullptr;
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if (activity == ThreadActivity::Paused) {
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SetStatus(ThreadStatus::Paused);
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return;
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}
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SetStatus(ThreadStatus::Ready);
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}
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void Thread::CancelWait() {
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if (GetSchedulingStatus() != ThreadSchedStatus::Paused) {
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is_sync_cancelled = true;
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return;
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}
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is_sync_cancelled = false;
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SetWaitSynchronizationResult(ERR_SYNCHRONIZATION_CANCELED);
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ResumeFromWait();
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}
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/**
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* Resets a thread context, making it ready to be scheduled and run by the CPU
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* @param context Thread context to reset
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* @param stack_top Address of the top of the stack
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* @param entry_point Address of entry point for execution
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* @param arg User argument for thread
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*/
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static void ResetThreadContext(Core::ARM_Interface::ThreadContext& context, VAddr stack_top,
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VAddr entry_point, u64 arg) {
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context = {};
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context.cpu_registers[0] = arg;
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context.pc = entry_point;
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context.sp = stack_top;
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// TODO(merry): Perform a hardware test to determine the below value.
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// AHP = 0, DN = 1, FTZ = 1, RMode = Round towards zero
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context.fpcr = 0x03C00000;
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}
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ResultVal<std::shared_ptr<Thread>> Thread::Create(KernelCore& kernel, std::string name,
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VAddr entry_point, u32 priority, u64 arg,
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s32 processor_id, VAddr stack_top,
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Process& owner_process) {
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// Check if priority is in ranged. Lowest priority -> highest priority id.
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if (priority > THREADPRIO_LOWEST) {
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LOG_ERROR(Kernel_SVC, "Invalid thread priority: {}", priority);
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return ERR_INVALID_THREAD_PRIORITY;
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}
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if (processor_id > THREADPROCESSORID_MAX) {
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LOG_ERROR(Kernel_SVC, "Invalid processor id: {}", processor_id);
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return ERR_INVALID_PROCESSOR_ID;
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}
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auto& system = Core::System::GetInstance();
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if (!system.Memory().IsValidVirtualAddress(owner_process, entry_point)) {
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LOG_ERROR(Kernel_SVC, "(name={}): invalid entry {:016X}", name, entry_point);
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// TODO (bunnei): Find the correct error code to use here
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return RESULT_UNKNOWN;
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}
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std::shared_ptr<Thread> thread = std::make_shared<Thread>(kernel);
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thread->thread_id = kernel.CreateNewThreadID();
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thread->status = ThreadStatus::Dormant;
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thread->entry_point = entry_point;
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thread->stack_top = stack_top;
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thread->tpidr_el0 = 0;
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thread->nominal_priority = thread->current_priority = priority;
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thread->last_running_ticks = system.CoreTiming().GetTicks();
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thread->processor_id = processor_id;
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thread->ideal_core = processor_id;
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thread->affinity_mask = 1ULL << processor_id;
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thread->wait_objects.clear();
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thread->mutex_wait_address = 0;
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thread->condvar_wait_address = 0;
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thread->wait_handle = 0;
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thread->name = std::move(name);
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thread->global_handle = kernel.GlobalHandleTable().Create(thread).Unwrap();
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thread->owner_process = &owner_process;
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auto& scheduler = kernel.GlobalScheduler();
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scheduler.AddThread(thread);
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thread->tls_address = thread->owner_process->CreateTLSRegion();
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thread->owner_process->RegisterThread(thread.get());
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// TODO(peachum): move to ScheduleThread() when scheduler is added so selected core is used
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// to initialize the context
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ResetThreadContext(thread->context, stack_top, entry_point, arg);
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return MakeResult<std::shared_ptr<Thread>>(std::move(thread));
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}
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void Thread::SetPriority(u32 priority) {
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ASSERT_MSG(priority <= THREADPRIO_LOWEST && priority >= THREADPRIO_HIGHEST,
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"Invalid priority value.");
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nominal_priority = priority;
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UpdatePriority();
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}
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void Thread::SetWaitSynchronizationResult(ResultCode result) {
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context.cpu_registers[0] = result.raw;
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}
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void Thread::SetWaitSynchronizationOutput(s32 output) {
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context.cpu_registers[1] = output;
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}
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s32 Thread::GetSynchronizationObjectIndex(std::shared_ptr<SynchronizationObject> object) const {
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ASSERT_MSG(!wait_objects.empty(), "Thread is not waiting for anything");
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const auto match = std::find(wait_objects.rbegin(), wait_objects.rend(), object);
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return static_cast<s32>(std::distance(match, wait_objects.rend()) - 1);
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}
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VAddr Thread::GetCommandBufferAddress() const {
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// Offset from the start of TLS at which the IPC command buffer begins.
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constexpr u64 command_header_offset = 0x80;
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return GetTLSAddress() + command_header_offset;
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}
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void Thread::SetStatus(ThreadStatus new_status) {
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if (new_status == status) {
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return;
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}
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switch (new_status) {
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case ThreadStatus::Ready:
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case ThreadStatus::Running:
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SetSchedulingStatus(ThreadSchedStatus::Runnable);
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break;
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case ThreadStatus::Dormant:
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SetSchedulingStatus(ThreadSchedStatus::None);
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break;
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case ThreadStatus::Dead:
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SetSchedulingStatus(ThreadSchedStatus::Exited);
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break;
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default:
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SetSchedulingStatus(ThreadSchedStatus::Paused);
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break;
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}
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if (status == ThreadStatus::Running) {
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last_running_ticks = Core::System::GetInstance().CoreTiming().GetTicks();
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}
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status = new_status;
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}
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void Thread::AddMutexWaiter(std::shared_ptr<Thread> thread) {
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if (thread->lock_owner.get() == this) {
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// If the thread is already waiting for this thread to release the mutex, ensure that the
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// waiters list is consistent and return without doing anything.
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const auto iter = std::find(wait_mutex_threads.begin(), wait_mutex_threads.end(), thread);
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ASSERT(iter != wait_mutex_threads.end());
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return;
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}
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// A thread can't wait on two different mutexes at the same time.
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ASSERT(thread->lock_owner == nullptr);
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// Ensure that the thread is not already in the list of mutex waiters
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const auto iter = std::find(wait_mutex_threads.begin(), wait_mutex_threads.end(), thread);
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ASSERT(iter == wait_mutex_threads.end());
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// Keep the list in an ordered fashion
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const auto insertion_point = std::find_if(
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wait_mutex_threads.begin(), wait_mutex_threads.end(),
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[&thread](const auto& entry) { return entry->GetPriority() > thread->GetPriority(); });
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wait_mutex_threads.insert(insertion_point, thread);
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thread->lock_owner = SharedFrom(this);
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UpdatePriority();
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}
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void Thread::RemoveMutexWaiter(std::shared_ptr<Thread> thread) {
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ASSERT(thread->lock_owner.get() == this);
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// Ensure that the thread is in the list of mutex waiters
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const auto iter = std::find(wait_mutex_threads.begin(), wait_mutex_threads.end(), thread);
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ASSERT(iter != wait_mutex_threads.end());
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wait_mutex_threads.erase(iter);
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thread->lock_owner = nullptr;
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UpdatePriority();
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}
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void Thread::UpdatePriority() {
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// If any of the threads waiting on the mutex have a higher priority
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// (taking into account priority inheritance), then this thread inherits
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// that thread's priority.
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u32 new_priority = nominal_priority;
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if (!wait_mutex_threads.empty()) {
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if (wait_mutex_threads.front()->current_priority < new_priority) {
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new_priority = wait_mutex_threads.front()->current_priority;
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}
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}
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if (new_priority == current_priority) {
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return;
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}
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if (GetStatus() == ThreadStatus::WaitCondVar) {
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owner_process->RemoveConditionVariableThread(SharedFrom(this));
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}
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SetCurrentPriority(new_priority);
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if (GetStatus() == ThreadStatus::WaitCondVar) {
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owner_process->InsertConditionVariableThread(SharedFrom(this));
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}
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if (!lock_owner) {
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return;
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}
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// Ensure that the thread is within the correct location in the waiting list.
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auto old_owner = lock_owner;
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lock_owner->RemoveMutexWaiter(SharedFrom(this));
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old_owner->AddMutexWaiter(SharedFrom(this));
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// Recursively update the priority of the thread that depends on the priority of this one.
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lock_owner->UpdatePriority();
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}
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void Thread::ChangeCore(u32 core, u64 mask) {
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SetCoreAndAffinityMask(core, mask);
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}
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bool Thread::AllSynchronizationObjectsReady() const {
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return std::none_of(wait_objects.begin(), wait_objects.end(),
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[this](const std::shared_ptr<SynchronizationObject>& object) {
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return object->ShouldWait(this);
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});
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}
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bool Thread::InvokeWakeupCallback(ThreadWakeupReason reason, std::shared_ptr<Thread> thread,
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std::shared_ptr<SynchronizationObject> object,
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std::size_t index) {
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ASSERT(wakeup_callback);
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return wakeup_callback(reason, std::move(thread), std::move(object), index);
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}
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void Thread::SetActivity(ThreadActivity value) {
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activity = value;
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if (value == ThreadActivity::Paused) {
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// Set status if not waiting
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if (status == ThreadStatus::Ready || status == ThreadStatus::Running) {
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SetStatus(ThreadStatus::Paused);
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kernel.PrepareReschedule(processor_id);
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}
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} else if (status == ThreadStatus::Paused) {
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// Ready to reschedule
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ResumeFromWait();
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}
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}
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void Thread::Sleep(s64 nanoseconds) {
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// Sleep current thread and check for next thread to schedule
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SetStatus(ThreadStatus::WaitSleep);
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// Create an event to wake the thread up after the specified nanosecond delay has passed
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WakeAfterDelay(nanoseconds);
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}
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bool Thread::YieldSimple() {
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auto& scheduler = kernel.GlobalScheduler();
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return scheduler.YieldThread(this);
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}
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bool Thread::YieldAndBalanceLoad() {
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auto& scheduler = kernel.GlobalScheduler();
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return scheduler.YieldThreadAndBalanceLoad(this);
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}
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bool Thread::YieldAndWaitForLoadBalancing() {
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auto& scheduler = kernel.GlobalScheduler();
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return scheduler.YieldThreadAndWaitForLoadBalancing(this);
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}
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void Thread::SetSchedulingStatus(ThreadSchedStatus new_status) {
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const u32 old_flags = scheduling_state;
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scheduling_state = (scheduling_state & static_cast<u32>(ThreadSchedMasks::HighMask)) |
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static_cast<u32>(new_status);
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AdjustSchedulingOnStatus(old_flags);
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}
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void Thread::SetCurrentPriority(u32 new_priority) {
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const u32 old_priority = std::exchange(current_priority, new_priority);
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AdjustSchedulingOnPriority(old_priority);
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}
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ResultCode Thread::SetCoreAndAffinityMask(s32 new_core, u64 new_affinity_mask) {
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const auto HighestSetCore = [](u64 mask, u32 max_cores) {
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for (s32 core = static_cast<s32>(max_cores - 1); core >= 0; core--) {
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if (((mask >> core) & 1) != 0) {
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return core;
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}
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}
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return -1;
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};
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const bool use_override = affinity_override_count != 0;
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if (new_core == THREADPROCESSORID_DONT_UPDATE) {
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new_core = use_override ? ideal_core_override : ideal_core;
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if ((new_affinity_mask & (1ULL << new_core)) == 0) {
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return ERR_INVALID_COMBINATION;
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}
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}
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if (use_override) {
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ideal_core_override = new_core;
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affinity_mask_override = new_affinity_mask;
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} else {
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const u64 old_affinity_mask = std::exchange(affinity_mask, new_affinity_mask);
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ideal_core = new_core;
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if (old_affinity_mask != new_affinity_mask) {
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const s32 old_core = processor_id;
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if (processor_id >= 0 && ((affinity_mask >> processor_id) & 1) == 0) {
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if (static_cast<s32>(ideal_core) < 0) {
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processor_id = HighestSetCore(affinity_mask, Core::Hardware::NUM_CPU_CORES);
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} else {
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processor_id = ideal_core;
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}
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}
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AdjustSchedulingOnAffinity(old_affinity_mask, old_core);
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}
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}
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return RESULT_SUCCESS;
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}
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void Thread::AdjustSchedulingOnStatus(u32 old_flags) {
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if (old_flags == scheduling_state) {
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return;
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}
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auto& scheduler = kernel.GlobalScheduler();
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if (static_cast<ThreadSchedStatus>(old_flags & static_cast<u32>(ThreadSchedMasks::LowMask)) ==
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ThreadSchedStatus::Runnable) {
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// In this case the thread was running, now it's pausing/exitting
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if (processor_id >= 0) {
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scheduler.Unschedule(current_priority, static_cast<u32>(processor_id), this);
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}
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for (u32 core = 0; core < Core::Hardware::NUM_CPU_CORES; core++) {
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if (core != static_cast<u32>(processor_id) && ((affinity_mask >> core) & 1) != 0) {
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scheduler.Unsuggest(current_priority, core, this);
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}
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}
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} else if (GetSchedulingStatus() == ThreadSchedStatus::Runnable) {
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// The thread is now set to running from being stopped
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if (processor_id >= 0) {
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scheduler.Schedule(current_priority, static_cast<u32>(processor_id), this);
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}
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for (u32 core = 0; core < Core::Hardware::NUM_CPU_CORES; core++) {
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if (core != static_cast<u32>(processor_id) && ((affinity_mask >> core) & 1) != 0) {
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scheduler.Suggest(current_priority, core, this);
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}
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}
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}
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scheduler.SetReselectionPending();
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}
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void Thread::AdjustSchedulingOnPriority(u32 old_priority) {
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if (GetSchedulingStatus() != ThreadSchedStatus::Runnable) {
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return;
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}
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auto& scheduler = kernel.GlobalScheduler();
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if (processor_id >= 0) {
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scheduler.Unschedule(old_priority, static_cast<u32>(processor_id), this);
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}
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for (u32 core = 0; core < Core::Hardware::NUM_CPU_CORES; core++) {
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if (core != static_cast<u32>(processor_id) && ((affinity_mask >> core) & 1) != 0) {
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scheduler.Unsuggest(old_priority, core, this);
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}
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}
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// Add thread to the new priority queues.
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|
Thread* current_thread = GetCurrentThread();
|
|
|
|
if (processor_id >= 0) {
|
|
if (current_thread == this) {
|
|
scheduler.SchedulePrepend(current_priority, static_cast<u32>(processor_id), this);
|
|
} else {
|
|
scheduler.Schedule(current_priority, static_cast<u32>(processor_id), this);
|
|
}
|
|
}
|
|
|
|
for (u32 core = 0; core < Core::Hardware::NUM_CPU_CORES; core++) {
|
|
if (core != static_cast<u32>(processor_id) && ((affinity_mask >> core) & 1) != 0) {
|
|
scheduler.Suggest(current_priority, core, this);
|
|
}
|
|
}
|
|
|
|
scheduler.SetReselectionPending();
|
|
}
|
|
|
|
void Thread::AdjustSchedulingOnAffinity(u64 old_affinity_mask, s32 old_core) {
|
|
auto& scheduler = kernel.GlobalScheduler();
|
|
if (GetSchedulingStatus() != ThreadSchedStatus::Runnable ||
|
|
current_priority >= THREADPRIO_COUNT) {
|
|
return;
|
|
}
|
|
|
|
for (u32 core = 0; core < Core::Hardware::NUM_CPU_CORES; core++) {
|
|
if (((old_affinity_mask >> core) & 1) != 0) {
|
|
if (core == static_cast<u32>(old_core)) {
|
|
scheduler.Unschedule(current_priority, core, this);
|
|
} else {
|
|
scheduler.Unsuggest(current_priority, core, this);
|
|
}
|
|
}
|
|
}
|
|
|
|
for (u32 core = 0; core < Core::Hardware::NUM_CPU_CORES; core++) {
|
|
if (((affinity_mask >> core) & 1) != 0) {
|
|
if (core == static_cast<u32>(processor_id)) {
|
|
scheduler.Schedule(current_priority, core, this);
|
|
} else {
|
|
scheduler.Suggest(current_priority, core, this);
|
|
}
|
|
}
|
|
}
|
|
|
|
scheduler.SetReselectionPending();
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
/**
|
|
* Gets the current thread
|
|
*/
|
|
Thread* GetCurrentThread() {
|
|
return Core::System::GetInstance().CurrentScheduler().GetCurrentThread();
|
|
}
|
|
|
|
} // namespace Kernel
|