0cbcd6ec9a
As means to pave the way for getting rid of global state within core, This eliminates kernel global state by removing all globals. Instead this introduces a KernelCore class which acts as a kernel instance. This instance lives in the System class, which keeps its lifetime contained to the lifetime of the System class. This also forces the kernel types to actually interact with the main kernel instance itself instead of having transient kernel state placed all over several translation units, keeping everything together. It also has a nice consequence of making dependencies much more explicit. This also makes our initialization a tad bit more correct. Previously we were creating a kernel process before the actual kernel was initialized, which doesn't really make much sense. The KernelCore class itself follows the PImpl idiom, which allows keeping all the implementation details sealed away from everything else, which forces the use of the exposed API and allows us to avoid any unnecessary inclusions within the main kernel header.
111 lines
3.6 KiB
C++
111 lines
3.6 KiB
C++
// Copyright 2014 Citra Emulator 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 "common/assert.h"
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#include "common/logging/log.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/thread.h"
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#include "core/hle/kernel/timer.h"
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namespace Kernel {
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WaitObject::WaitObject(KernelCore& kernel) : Object{kernel} {}
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WaitObject::~WaitObject() = default;
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void WaitObject::AddWaitingThread(SharedPtr<Thread> thread) {
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auto itr = std::find(waiting_threads.begin(), waiting_threads.end(), thread);
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if (itr == waiting_threads.end())
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waiting_threads.push_back(std::move(thread));
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}
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void WaitObject::RemoveWaitingThread(Thread* thread) {
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auto itr = std::find(waiting_threads.begin(), waiting_threads.end(), thread);
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// If a thread passed multiple handles to the same object,
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// the kernel might attempt to remove the thread from the object's
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// waiting threads list multiple times.
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if (itr != waiting_threads.end())
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waiting_threads.erase(itr);
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}
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SharedPtr<Thread> WaitObject::GetHighestPriorityReadyThread() {
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Thread* candidate = nullptr;
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u32 candidate_priority = THREADPRIO_LOWEST + 1;
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for (const auto& thread : waiting_threads) {
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// The list of waiting threads must not contain threads that are not waiting to be awakened.
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ASSERT_MSG(thread->status == ThreadStatus::WaitSynchAny ||
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thread->status == ThreadStatus::WaitSynchAll ||
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thread->status == ThreadStatus::WaitHLEEvent,
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"Inconsistent thread statuses in waiting_threads");
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if (thread->current_priority >= candidate_priority)
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continue;
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if (ShouldWait(thread.get()))
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continue;
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// A thread is ready to run if it's either in ThreadStatus::WaitSynchAny or
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// in ThreadStatus::WaitSynchAll and the rest of the objects it is waiting on are ready.
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bool ready_to_run = true;
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if (thread->status == ThreadStatus::WaitSynchAll) {
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ready_to_run = std::none_of(thread->wait_objects.begin(), thread->wait_objects.end(),
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[&thread](const SharedPtr<WaitObject>& object) {
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return object->ShouldWait(thread.get());
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});
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}
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if (ready_to_run) {
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candidate = thread.get();
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candidate_priority = thread->current_priority;
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}
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}
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return candidate;
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}
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void WaitObject::WakeupWaitingThread(SharedPtr<Thread> thread) {
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ASSERT(!ShouldWait(thread.get()));
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if (!thread)
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return;
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if (!thread->IsSleepingOnWaitAll()) {
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Acquire(thread.get());
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} else {
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for (auto& object : thread->wait_objects) {
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ASSERT(!object->ShouldWait(thread.get()));
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object->Acquire(thread.get());
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}
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}
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size_t index = thread->GetWaitObjectIndex(this);
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for (auto& object : thread->wait_objects)
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object->RemoveWaitingThread(thread.get());
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thread->wait_objects.clear();
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thread->CancelWakeupTimer();
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bool resume = true;
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if (thread->wakeup_callback)
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resume = thread->wakeup_callback(ThreadWakeupReason::Signal, thread, this, index);
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if (resume)
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thread->ResumeFromWait();
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}
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void WaitObject::WakeupAllWaitingThreads() {
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while (auto thread = GetHighestPriorityReadyThread()) {
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WakeupWaitingThread(thread);
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}
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}
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const std::vector<SharedPtr<Thread>>& WaitObject::GetWaitingThreads() const {
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return waiting_threads;
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}
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} // namespace Kernel
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