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Threading: Added some utility functions and const correctness.
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@ -230,7 +230,7 @@ std::vector<std::unique_ptr<WaitTreeItem>> WaitTreeThread::GetChildren() const {
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list.push_back(std::make_unique<WaitTreeMutexList>(thread.held_mutexes));
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}
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if (thread.status == THREADSTATUS_WAIT_SYNCH) {
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list.push_back(std::make_unique<WaitTreeObjectList>(thread.wait_objects, !thread.wait_objects.empty()));
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list.push_back(std::make_unique<WaitTreeObjectList>(thread.wait_objects, thread.IsWaitingAll()));
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}
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return list;
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@ -33,7 +33,7 @@ void WaitObject::RemoveWaitingThread(Thread* thread) {
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SharedPtr<Thread> WaitObject::GetHighestPriorityReadyThread() {
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// Remove the threads that are ready or already running from our waitlist
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waiting_threads.erase(std::remove_if(waiting_threads.begin(), waiting_threads.end(), [](SharedPtr<Thread> thread) -> bool {
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waiting_threads.erase(std::remove_if(waiting_threads.begin(), waiting_threads.end(), [](const SharedPtr<Thread>& thread) -> bool {
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return thread->status == THREADSTATUS_RUNNING || thread->status == THREADSTATUS_READY;
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}), waiting_threads.end());
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@ -42,12 +42,11 @@ SharedPtr<Thread> WaitObject::GetHighestPriorityReadyThread() {
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auto candidate_threads = waiting_threads;
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// Eliminate all threads that are waiting on more than one object, and not all of them are ready
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candidate_threads.erase(std::remove_if(candidate_threads.begin(), candidate_threads.end(), [](SharedPtr<Thread> thread) -> bool {
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for (auto object : thread->wait_objects)
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if (object->ShouldWait())
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return true;
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return false;
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// Eliminate all threads that are waiting on more than one object, and not all of said objects are ready
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candidate_threads.erase(std::remove_if(candidate_threads.begin(), candidate_threads.end(), [](const SharedPtr<Thread>& thread) -> bool {
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return std::any_of(thread->wait_objects.begin(), thread->wait_objects.end(), [](const SharedPtr<WaitObject>& object) -> bool {
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return object->ShouldWait();
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});
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}), candidate_threads.end());
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// Return the thread with the lowest priority value (The one with the highest priority)
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@ -131,8 +131,8 @@ public:
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* It is used to set the output value of WaitSynchronizationN when the thread is awakened.
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* @param object Object to query the index of.
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*/
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s32 GetWaitObjectIndex(WaitObject* object) {
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return wait_objects_index[object->GetObjectId()];
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s32 GetWaitObjectIndex(const WaitObject* object) const {
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return wait_objects_index.at(object->GetObjectId());
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}
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/**
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@ -148,6 +148,15 @@ public:
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return tls_address;
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}
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/**
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* Returns whether this thread is waiting for all the objects in
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* its wait list to become ready, as a result of a WaitSynchronizationN call
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* with wait_all = true, or a ReplyAndReceive call.
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*/
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bool IsWaitingAll() const {
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return !wait_objects.empty();
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}
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Core::ThreadContext context;
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u32 thread_id;
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@ -169,7 +178,11 @@ public:
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boost::container::flat_set<SharedPtr<Mutex>> held_mutexes;
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SharedPtr<Process> owner_process; ///< Process that owns this thread
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std::vector<SharedPtr<WaitObject>> wait_objects; ///< Objects that the thread is waiting on
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/// Objects that the thread is waiting on.
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/// This is only populated when the thread should wait for all the objects to become ready.
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std::vector<SharedPtr<WaitObject>> wait_objects;
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std::unordered_map<int, s32> wait_objects_index; ///< Mapping of Object ids to their position in the last waitlist that this object waited on.
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VAddr wait_address; ///< If waiting on an AddressArbiter, this is the arbitration address
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@ -257,18 +257,21 @@ static ResultCode WaitSynchronization1(Handle handle, s64 nano_seconds) {
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if (object->ShouldWait()) {
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if (nano_seconds == 0)
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if (nano_seconds == 0) {
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return ResultCode(ErrorDescription::Timeout, ErrorModule::OS,
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ErrorSummary::StatusChanged,
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ErrorLevel::Info);
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}
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object->AddWaitingThread(thread);
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// TODO(Subv): Perform things like update the mutex lock owner's priority to prevent priority inversion.
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// Currently this is done in Mutex::ShouldWait, but it should be moved to a function that is called from here.
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thread->status = THREADSTATUS_WAIT_SYNCH;
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// Create an event to wake the thread up after the specified nanosecond delay has passed
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thread->WakeAfterDelay(nano_seconds);
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// Note: The output of this SVC will be set to RESULT_SUCCESS if the thread resumes due to a signal in one of its wait objects.
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// Note: The output of this SVC will be set to RESULT_SUCCESS if the thread resumes due to a signal in its wait objects.
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// Otherwise we retain the default value of timeout.
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return ResultCode(ErrorDescription::Timeout, ErrorModule::OS,
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ErrorSummary::StatusChanged,
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@ -312,7 +315,9 @@ static ResultCode WaitSynchronizationN(s32* out, Handle* handles, s32 handle_cou
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objects[i] = object;
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}
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// Clear the mapping of wait object indices
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// Clear the mapping of wait object indices.
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// We don't want any lingering state in this map.
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// It will be repopulated later in the wait_all = false case.
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thread->wait_objects_index.clear();
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if (!wait_all) {
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@ -345,12 +350,13 @@ static ResultCode WaitSynchronizationN(s32* out, Handle* handles, s32 handle_cou
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thread->wait_objects.clear();
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// Add the thread to each of the objects' waiting threads.
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for (int i = 0; i < objects.size(); ++i) {
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for (size_t i = 0; i < objects.size(); ++i) {
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ObjectPtr object = objects[i];
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// Set the index of this object in the mapping of Objects -> index for this thread.
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thread->wait_objects_index[object->GetObjectId()] = i;
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thread->wait_objects_index[object->GetObjectId()] = static_cast<int>(i);
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object->AddWaitingThread(thread);
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// TODO(Subv): Perform things like update the mutex lock owner's priority to prevent priority inversion.
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// Currently this is done in Mutex::ShouldWait, but it should be moved to a function that is called from here.
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}
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// Note: If no handles and no timeout were given, then the thread will deadlock, this is consistent with hardware behavior.
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@ -396,6 +402,7 @@ static ResultCode WaitSynchronizationN(s32* out, Handle* handles, s32 handle_cou
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for (auto object : objects) {
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object->AddWaitingThread(thread);
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// TODO(Subv): Perform things like update the mutex lock owner's priority to prevent priority inversion.
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// Currently this is done in Mutex::ShouldWait, but it should be moved to a function that is called from here.
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}
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// Create an event to wake the thread up after the specified nanosecond delay has passed
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@ -1172,6 +1179,7 @@ void CallSVC(u32 immediate) {
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if (info) {
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if (info->func) {
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info->func();
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// TODO(Subv): Not all service functions should cause a reschedule in all cases.
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HLE::Reschedule(__func__);
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} else {
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LOG_ERROR(Kernel_SVC, "unimplemented SVC function %s(..)", info->name);
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