6643673f28
- Separate wait checking from waiting the current thread - Resume thread when wait_all=true only if all objects are available at once - Set output to correct wait object index when there are duplicate handles
500 lines
17 KiB
C++
500 lines
17 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 <list>
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#include <map>
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#include <vector>
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#include "common/common.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/hle/hle.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/kernel/thread.h"
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#include "core/hle/kernel/mutex.h"
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#include "core/hle/result.h"
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#include "core/mem_map.h"
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namespace Kernel {
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ResultVal<bool> Thread::Wait(bool wait_thread) {
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const bool wait = status != THREADSTATUS_DORMANT;
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if (wait && wait_thread) {
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AddWaitingThread(GetCurrentThread());
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WaitCurrentThread_WaitSynchronization(WAITTYPE_THREADEND, this);
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}
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return MakeResult<bool>(wait);
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}
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ResultVal<bool> Thread::Acquire() {
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return MakeResult<bool>(true);
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}
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// Lists all thread ids that aren't deleted/etc.
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static std::vector<SharedPtr<Thread>> thread_list;
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// Lists only ready thread ids.
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static Common::ThreadQueueList<Thread*, THREADPRIO_LOWEST+1> thread_ready_queue;
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static Thread* current_thread;
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static const u32 INITIAL_THREAD_ID = 1; ///< The first available thread id at startup
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static u32 next_thread_id; ///< The next available thread id
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Thread* GetCurrentThread() {
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return current_thread;
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}
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/// Resets a thread
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static void ResetThread(Thread* t, u32 arg, s32 lowest_priority) {
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memset(&t->context, 0, sizeof(Core::ThreadContext));
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t->context.cpu_registers[0] = arg;
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t->context.pc = t->context.reg_15 = t->entry_point;
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t->context.sp = t->stack_top;
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t->context.cpsr = 0x1F; // Usermode
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// TODO(bunnei): This instructs the CPU core to start the execution as if it is "resuming" a
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// thread. This is somewhat Sky-Eye specific, and should be re-architected in the future to be
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// agnostic of the CPU core.
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t->context.mode = 8;
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if (t->current_priority < lowest_priority) {
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t->current_priority = t->initial_priority;
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}
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t->wait_type = WAITTYPE_NONE;
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t->wait_objects.clear();
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t->wait_address = 0;
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}
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/// Change a thread to "ready" state
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static void ChangeReadyState(Thread* t, bool ready) {
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if (t->IsReady()) {
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if (!ready) {
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thread_ready_queue.remove(t->current_priority, t);
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}
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} else if (ready) {
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if (t->IsRunning()) {
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thread_ready_queue.push_front(t->current_priority, t);
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} else {
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thread_ready_queue.push_back(t->current_priority, t);
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}
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t->status = THREADSTATUS_READY;
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}
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}
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/// Check if a thread is blocking on a specified wait type
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static bool CheckWaitType(const Thread* thread, WaitType type) {
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return (type == thread->wait_type) && (thread->IsWaiting());
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}
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/// Check if a thread is blocking on a specified wait type with a specified handle
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static bool CheckWaitType(const Thread* thread, WaitType type, Object* wait_object) {
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for (auto itr = thread->wait_objects.begin(); itr != thread->wait_objects.end(); ++itr) {
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if (*itr == wait_object)
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return CheckWaitType(thread, type);
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}
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return false;
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}
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/// Check if a thread is blocking on a specified wait type with a specified handle and address
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static bool CheckWaitType(const Thread* thread, WaitType type, Object* wait_object, VAddr wait_address) {
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return CheckWaitType(thread, type, wait_object) && (wait_address == thread->wait_address);
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}
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/// Stops the current thread
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void Thread::Stop(const char* reason) {
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// Release all the mutexes that this thread holds
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ReleaseThreadMutexes(GetHandle());
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ChangeReadyState(this, false);
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status = THREADSTATUS_DORMANT;
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ReleaseAllWaitingThreads();
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// Stopped threads are never waiting.
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wait_type = WAITTYPE_NONE;
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wait_objects.clear();
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wait_address = 0;
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}
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/// Changes a threads state
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static void ChangeThreadState(Thread* t, ThreadStatus new_status) {
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if (!t || t->status == new_status) {
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return;
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}
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ChangeReadyState(t, (new_status & THREADSTATUS_READY) != 0);
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t->status = new_status;
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if (new_status == THREADSTATUS_WAIT) {
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if (t->wait_type == WAITTYPE_NONE) {
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LOG_ERROR(Kernel, "Waittype none not allowed");
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}
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}
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}
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/// Arbitrate the highest priority thread that is waiting
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Thread* ArbitrateHighestPriorityThread(WaitObject* arbiter, u32 address) {
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Thread* highest_priority_thread = nullptr;
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s32 priority = THREADPRIO_LOWEST;
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// Iterate through threads, find highest priority thread that is waiting to be arbitrated...
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for (auto& thread : thread_list) {
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if (!CheckWaitType(thread.get(), WAITTYPE_ARB, arbiter, address))
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continue;
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if (thread == nullptr)
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continue; // TODO(yuriks): Thread handle will hang around forever. Should clean up.
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if(thread->current_priority <= priority) {
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highest_priority_thread = thread.get();
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priority = thread->current_priority;
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}
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}
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// If a thread was arbitrated, resume it
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if (nullptr != highest_priority_thread) {
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highest_priority_thread->ReleaseFromWait(arbiter);
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}
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return highest_priority_thread;
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}
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/// Arbitrate all threads currently waiting
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void ArbitrateAllThreads(WaitObject* arbiter, u32 address) {
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// Iterate through threads, find highest priority thread that is waiting to be arbitrated...
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for (auto& thread : thread_list) {
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if (CheckWaitType(thread.get(), WAITTYPE_ARB, arbiter, address))
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thread->ReleaseFromWait(arbiter);
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}
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}
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/// Calls a thread by marking it as "ready" (note: will not actually execute until current thread yields)
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static void CallThread(Thread* t) {
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// Stop waiting
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if (t->wait_type != WAITTYPE_NONE) {
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t->wait_type = WAITTYPE_NONE;
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}
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ChangeThreadState(t, THREADSTATUS_READY);
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}
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/// Switches CPU context to that of the specified thread
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static void SwitchContext(Thread* t) {
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Thread* cur = GetCurrentThread();
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// Save context for current thread
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if (cur) {
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Core::g_app_core->SaveContext(cur->context);
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if (cur->IsRunning()) {
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ChangeReadyState(cur, true);
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}
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}
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// Load context of new thread
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if (t) {
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current_thread = t;
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ChangeReadyState(t, false);
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t->status = (t->status | THREADSTATUS_RUNNING) & ~THREADSTATUS_READY;
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t->wait_type = WAITTYPE_NONE;
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Core::g_app_core->LoadContext(t->context);
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} else {
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current_thread = nullptr;
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}
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}
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/// Gets the next thread that is ready to be run by priority
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static Thread* NextThread() {
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Thread* next;
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Thread* cur = GetCurrentThread();
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if (cur && cur->IsRunning()) {
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next = thread_ready_queue.pop_first_better(cur->current_priority);
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} else {
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next = thread_ready_queue.pop_first();
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}
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if (next == 0) {
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return nullptr;
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}
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return next;
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}
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void WaitCurrentThread(WaitType wait_type) {
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Thread* thread = GetCurrentThread();
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thread->wait_type = wait_type;
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ChangeThreadState(thread, ThreadStatus(THREADSTATUS_WAIT | (thread->status & THREADSTATUS_SUSPEND)));
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}
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void WaitCurrentThread_WaitSynchronization(WaitType wait_type, WaitObject* wait_object, unsigned index) {
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Thread* thread = GetCurrentThread();
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thread->wait_type = wait_type;
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thread->wait_objects.push_back(wait_object);
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ChangeThreadState(thread, ThreadStatus(THREADSTATUS_WAIT | (thread->status & THREADSTATUS_SUSPEND)));
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}
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void WaitCurrentThread_ArbitrateAddress(WaitObject* wait_object, VAddr wait_address) {
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WaitCurrentThread_WaitSynchronization(WaitType::WAITTYPE_ARB, wait_object, 0);
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GetCurrentThread()->wait_address = wait_address;
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}
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/// Event type for the thread wake up event
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static int ThreadWakeupEventType = -1;
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/// Callback that will wake up the thread it was scheduled for
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static void ThreadWakeupCallback(u64 parameter, int cycles_late) {
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Handle handle = static_cast<Handle>(parameter);
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SharedPtr<Thread> thread = Kernel::g_handle_table.Get<Thread>(handle);
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if (thread == nullptr) {
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LOG_ERROR(Kernel, "Thread doesn't exist %u", handle);
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return;
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}
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thread->SetReturnValue(ResultCode(ErrorDescription::Timeout, ErrorModule::OS,
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ErrorSummary::StatusChanged, ErrorLevel::Info), -1);
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thread->ResumeFromWait();
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}
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void WakeThreadAfterDelay(Thread* thread, 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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_dbg_assert_(Kernel, thread != nullptr);
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u64 microseconds = nanoseconds / 1000;
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CoreTiming::ScheduleEvent(usToCycles(microseconds), ThreadWakeupEventType, thread->GetHandle());
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}
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void Thread::ReleaseFromWait(WaitObject* wait_object) {
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if (wait_objects.empty()) {
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LOG_CRITICAL(Kernel, "thread is not waiting on any objects!");
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return;
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}
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// Remove this thread from the waiting object's thread list
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wait_object->RemoveWaitingThread(this);
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unsigned index = 0;
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bool wait_all_failed = false; // Will be set to true if any object is unavailable
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// Iterate through all waiting objects to check availability...
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for (auto itr = wait_objects.begin(); itr != wait_objects.end(); ++itr) {
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auto res = (*itr)->Wait(false);
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if (*res && res.Succeeded())
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wait_all_failed = true;
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// The output should be the last index of wait_object
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if (*itr == wait_object)
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index = itr - wait_objects.begin();
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}
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// If we are waiting on all objects...
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if (wait_all) {
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// Resume the thread only if all are available...
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if (!wait_all_failed) {
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SetReturnValue(RESULT_SUCCESS, -1);
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ResumeFromWait();
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}
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} else {
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// Otherwise, resume
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SetReturnValue(RESULT_SUCCESS, index);
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ResumeFromWait();
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}
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}
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void Thread::ResumeFromWait() {
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// Cancel any outstanding wakeup events
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CoreTiming::UnscheduleEvent(ThreadWakeupEventType, GetHandle());
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status &= ~THREADSTATUS_WAIT;
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// Remove this thread from all other WaitObjects
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for (auto wait_object : wait_objects)
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wait_object->RemoveWaitingThread(this);
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wait_objects.clear();
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wait_type = WAITTYPE_NONE;
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wait_all = false;
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if (!(status & (THREADSTATUS_WAITSUSPEND | THREADSTATUS_DORMANT | THREADSTATUS_DEAD))) {
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ChangeReadyState(this, true);
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}
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}
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/// Prints the thread queue for debugging purposes
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static void DebugThreadQueue() {
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Thread* thread = GetCurrentThread();
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if (!thread) {
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return;
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}
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LOG_DEBUG(Kernel, "0x%02X 0x%08X (current)", thread->current_priority, GetCurrentThread()->GetHandle());
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for (auto& t : thread_list) {
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s32 priority = thread_ready_queue.contains(t.get());
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if (priority != -1) {
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LOG_DEBUG(Kernel, "0x%02X 0x%08X", priority, t->GetHandle());
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}
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}
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}
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ResultVal<SharedPtr<Thread>> Thread::Create(std::string name, VAddr entry_point, s32 priority,
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u32 arg, s32 processor_id, VAddr stack_top, u32 stack_size) {
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if (stack_size < 0x200) {
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LOG_ERROR(Kernel, "(name=%s): invalid stack_size=0x%08X", name.c_str(), stack_size);
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// TODO: Verify error
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return ResultCode(ErrorDescription::InvalidSize, ErrorModule::Kernel,
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ErrorSummary::InvalidArgument, ErrorLevel::Permanent);
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}
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if (priority < THREADPRIO_HIGHEST || priority > THREADPRIO_LOWEST) {
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s32 new_priority = CLAMP(priority, THREADPRIO_HIGHEST, THREADPRIO_LOWEST);
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LOG_WARNING(Kernel_SVC, "(name=%s): invalid priority=%d, clamping to %d",
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name.c_str(), priority, new_priority);
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// TODO(bunnei): Clamping to a valid priority is not necessarily correct behavior... Confirm
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// validity of this
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priority = new_priority;
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}
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if (!Memory::GetPointer(entry_point)) {
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LOG_ERROR(Kernel_SVC, "(name=%s): invalid entry %08x", name.c_str(), entry_point);
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// TODO: Verify error
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return ResultCode(ErrorDescription::InvalidAddress, ErrorModule::Kernel,
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ErrorSummary::InvalidArgument, ErrorLevel::Permanent);
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}
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SharedPtr<Thread> thread(new Thread);
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// TODO(yuriks): Thread requires a handle to be inserted into the various scheduling queues for
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// the time being. Create a handle here, it will be copied to the handle field in
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// the object and use by the rest of the code. This should be removed when other
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// code doesn't rely on the handle anymore.
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ResultVal<Handle> handle = Kernel::g_handle_table.Create(thread);
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if (handle.Failed())
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return handle.Code();
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thread_list.push_back(thread);
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thread_ready_queue.prepare(priority);
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thread->thread_id = next_thread_id++;
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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->stack_size = stack_size;
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thread->initial_priority = thread->current_priority = priority;
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thread->processor_id = processor_id;
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thread->wait_type = WAITTYPE_NONE;
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thread->wait_all = false;
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thread->wait_objects.clear();
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thread->wait_address = 0;
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thread->name = std::move(name);
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ResetThread(thread.get(), arg, 0);
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CallThread(thread.get());
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return MakeResult<SharedPtr<Thread>>(std::move(thread));
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}
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/// Set the priority of the thread specified by handle
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void Thread::SetPriority(s32 priority) {
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// If priority is invalid, clamp to valid range
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if (priority < THREADPRIO_HIGHEST || priority > THREADPRIO_LOWEST) {
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s32 new_priority = CLAMP(priority, THREADPRIO_HIGHEST, THREADPRIO_LOWEST);
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LOG_WARNING(Kernel_SVC, "invalid priority=%d, clamping to %d", priority, new_priority);
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// TODO(bunnei): Clamping to a valid priority is not necessarily correct behavior... Confirm
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// validity of this
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priority = new_priority;
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}
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// Change thread priority
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s32 old = current_priority;
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thread_ready_queue.remove(old, this);
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current_priority = priority;
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thread_ready_queue.prepare(current_priority);
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// Change thread status to "ready" and push to ready queue
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if (IsRunning()) {
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status = (status & ~THREADSTATUS_RUNNING) | THREADSTATUS_READY;
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}
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if (IsReady()) {
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thread_ready_queue.push_back(current_priority, this);
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}
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}
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Handle SetupIdleThread() {
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// We need to pass a few valid values to get around parameter checking in Thread::Create.
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auto thread_res = Thread::Create("idle", Memory::KERNEL_MEMORY_VADDR, THREADPRIO_LOWEST, 0,
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THREADPROCESSORID_0, 0, Kernel::DEFAULT_STACK_SIZE);
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_dbg_assert_(Kernel, thread_res.Succeeded());
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SharedPtr<Thread> thread = std::move(*thread_res);
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thread->idle = true;
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CallThread(thread.get());
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return thread->GetHandle();
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}
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SharedPtr<Thread> SetupMainThread(s32 priority, u32 stack_size) {
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// Initialize new "main" thread
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auto thread_res = Thread::Create("main", Core::g_app_core->GetPC(), priority, 0,
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THREADPROCESSORID_0, Memory::SCRATCHPAD_VADDR_END, stack_size);
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// TODO(yuriks): Propagate error
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_dbg_assert_(Kernel, thread_res.Succeeded());
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SharedPtr<Thread> thread = std::move(*thread_res);
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// If running another thread already, set it to "ready" state
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Thread* cur = GetCurrentThread();
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if (cur && cur->IsRunning()) {
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ChangeReadyState(cur, true);
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}
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// Run new "main" thread
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current_thread = thread.get();
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thread->status = THREADSTATUS_RUNNING;
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Core::g_app_core->LoadContext(thread->context);
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return thread;
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}
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/// Reschedules to the next available thread (call after current thread is suspended)
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void Reschedule() {
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Thread* prev = GetCurrentThread();
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Thread* next = NextThread();
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HLE::g_reschedule = false;
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if (next != nullptr) {
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LOG_TRACE(Kernel, "context switch 0x%08X -> 0x%08X", prev->GetHandle(), next->GetHandle());
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SwitchContext(next);
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} else {
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LOG_TRACE(Kernel, "cannot context switch from 0x%08X, no higher priority thread!", prev->GetHandle());
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for (auto& thread : thread_list) {
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LOG_TRACE(Kernel, "\thandle=0x%08X prio=0x%02X, status=0x%08X wait_type=0x%08X",
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thread->GetHandle(), thread->current_priority, thread->status, thread->wait_type);
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}
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}
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}
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void Thread::SetReturnValue(ResultCode return_val, s32 out_val) {
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context.cpu_registers[0] = return_val.raw;
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context.cpu_registers[1] = out_val;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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void ThreadingInit() {
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next_thread_id = INITIAL_THREAD_ID;
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ThreadWakeupEventType = CoreTiming::RegisterEvent("ThreadWakeupCallback", ThreadWakeupCallback);
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}
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void ThreadingShutdown() {
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}
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} // namespace
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