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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/hle/kernel/kernel.h"
#include "core/hle/kernel/object.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/synchronization.h"
#include "core/hle/kernel/synchronization_object.h"
#include "core/hle/kernel/thread.h"
namespace Kernel {
SynchronizationObject::SynchronizationObject(KernelCore& kernel) : Object{kernel} {}
SynchronizationObject::~SynchronizationObject() = default;
void SynchronizationObject::Signal() {
kernel.Synchronization().SignalObject(*this);
}
void SynchronizationObject::AddWaitingThread(std::shared_ptr<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 SynchronizationObject::RemoveWaitingThread(std::shared_ptr<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);
}
std::shared_ptr<Thread> SynchronizationObject::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;
candidate = thread.get();
candidate_priority = thread->GetPriority();
}
return SharedFrom(candidate);
}
void SynchronizationObject::WakeupWaitingThread(std::shared_ptr<Thread> thread) {
ASSERT(!ShouldWait(thread.get()));
if (!thread) {
return;
}
if (thread->IsSleepingOnWait()) {
for (const auto& object : thread->GetSynchronizationObjects()) {
ASSERT(!object->ShouldWait(thread.get()));
object->Acquire(thread.get());
}
} else {
Acquire(thread.get());
}
const std::size_t index = thread->GetSynchronizationObjectIndex(SharedFrom(this));
thread->ClearSynchronizationObjects();
thread->CancelWakeupTimer();
bool resume = true;
if (thread->HasWakeupCallback()) {
resume = thread->InvokeWakeupCallback(ThreadWakeupReason::Signal, thread, SharedFrom(this),
index);
}
if (resume) {
thread->ResumeFromWait();
kernel.PrepareReschedule(thread->GetProcessorID());
}
}
void SynchronizationObject::WakeupAllWaitingThreads() {
while (auto thread = GetHighestPriorityReadyThread()) {
WakeupWaitingThread(thread);
}
}
const std::vector<std::shared_ptr<Thread>>& SynchronizationObject::GetWaitingThreads() const {
return waiting_threads;
}
} // namespace Kernel
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