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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include "common/assert.h"
#include "common/common_types.h"
#include "common/logging/log.h"
#include "core/core.h"
#include "core/core_cpu.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/object.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/thread.h"
namespace Kernel {
WaitObject::WaitObject(KernelCore& kernel) : Object{kernel} {}
WaitObject::~WaitObject() = default;
void WaitObject::AddWaitingThread(SharedPtr<Thread> thread) {
auto itr = std::find(waiting_threads.begin(), waiting_threads.end(), thread);
if (itr == waiting_threads.end())
waiting_threads.push_back(std::move(thread));
}
void WaitObject::RemoveWaitingThread(Thread* thread) {
auto itr = std::find(waiting_threads.begin(), waiting_threads.end(), thread);
// If a thread passed multiple handles to the same object,
// the kernel might attempt to remove the thread from the object's
// waiting threads list multiple times.
if (itr != waiting_threads.end())
waiting_threads.erase(itr);
}
SharedPtr<Thread> WaitObject::GetHighestPriorityReadyThread() const {
Thread* candidate = nullptr;
u32 candidate_priority = THREADPRIO_LOWEST + 1;
for (const auto& thread : waiting_threads) {
const ThreadStatus thread_status = thread->GetStatus();
// The list of waiting threads must not contain threads that are not waiting to be awakened.
ASSERT_MSG(thread_status == ThreadStatus::WaitSynch ||
thread_status == ThreadStatus::WaitHLEEvent,
"Inconsistent thread statuses in waiting_threads");
if (thread->GetPriority() >= candidate_priority)
continue;
if (ShouldWait(thread.get()))
continue;
// A thread is ready to run if it's either in ThreadStatus::WaitSynch
// and the rest of the objects it is waiting on are ready.
bool ready_to_run = true;
if (thread_status == ThreadStatus::WaitSynch) {
ready_to_run = thread->AllWaitObjectsReady();
}
if (ready_to_run) {
candidate = thread.get();
candidate_priority = thread->GetPriority();
}
}
return candidate;
}
void WaitObject::WakeupWaitingThread(SharedPtr<Thread> thread) {
ASSERT(!ShouldWait(thread.get()));
if (!thread) {
return;
}
if (thread->IsSleepingOnWait()) {
for (const auto& object : thread->GetWaitObjects()) {
ASSERT(!object->ShouldWait(thread.get()));
object->Acquire(thread.get());
}
} else {
Acquire(thread.get());
}
const std::size_t index = thread->GetWaitObjectIndex(this);
thread->ClearWaitObjects();
thread->CancelWakeupTimer();
bool resume = true;
if (thread->HasWakeupCallback()) {
resume = thread->InvokeWakeupCallback(ThreadWakeupReason::Signal, thread, this, index);
}
if (resume) {
thread->ResumeFromWait();
Core::System::GetInstance().PrepareReschedule(thread->GetProcessorID());
}
}
void WaitObject::WakeupAllWaitingThreads() {
while (auto thread = GetHighestPriorityReadyThread()) {
WakeupWaitingThread(thread);
}
}
const std::vector<SharedPtr<Thread>>& WaitObject::GetWaitingThreads() const {
return waiting_threads;
}
} // namespace Kernel
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