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@ -264,14 +264,16 @@ static ResultCode WaitSynchronization1(Handle handle, s64 nano_seconds) {
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return ERR_SYNC_TIMEOUT;
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return ERR_SYNC_TIMEOUT;
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object->AddWaitingThread(thread);
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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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// TODO(Subv): Perform things like update the mutex lock owner's priority to
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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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// prevent priority inversion. Currently this is done in Mutex::ShouldWait,
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// 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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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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// 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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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 its wait objects.
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// Note: The output of this SVC will be set to RESULT_SUCCESS if the thread
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// 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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// Otherwise we retain the default value of timeout.
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return ERR_SYNC_TIMEOUT;
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return ERR_SYNC_TIMEOUT;
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}
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}
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@ -316,20 +318,22 @@ static ResultCode WaitSynchronizationN(s32* out, Handle* handles, s32 handle_cou
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thread->wait_objects_index.clear();
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thread->wait_objects_index.clear();
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if (wait_all) {
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if (wait_all) {
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bool all_available = std::all_of(objects.begin(), objects.end(), [](const ObjectPtr& object) {
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bool all_available =
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return !object->ShouldWait();
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std::all_of(objects.begin(), objects.end(),
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});
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[](const ObjectPtr& object) { return !object->ShouldWait(); });
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if (all_available) {
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if (all_available) {
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// We can acquire all objects right now, do so.
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// We can acquire all objects right now, do so.
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for (auto& object : objects)
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for (auto& object : objects)
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object->Acquire();
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object->Acquire();
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// Note: In this case, the `out` parameter is not set, and retains whatever value it had before.
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// Note: In this case, the `out` parameter is not set,
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// and retains whatever value it had before.
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return RESULT_SUCCESS;
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return RESULT_SUCCESS;
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}
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}
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// Not all objects were available right now, prepare to suspend the thread.
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// Not all objects were available right now, prepare to suspend the thread.
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// If a timeout value of 0 was provided, just return the Timeout error code instead of suspending the thread.
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// If a timeout value of 0 was provided, just return the Timeout error code instead of
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// suspending the thread.
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if (nano_seconds == 0)
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if (nano_seconds == 0)
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return ERR_SYNC_TIMEOUT;
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return ERR_SYNC_TIMEOUT;
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@ -339,8 +343,9 @@ static ResultCode WaitSynchronizationN(s32* out, Handle* handles, s32 handle_cou
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// Add the thread to each of the objects' waiting threads.
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// Add the thread to each of the objects' waiting threads.
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for (auto& object : objects) {
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for (auto& object : objects) {
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object->AddWaitingThread(thread);
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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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// TODO(Subv): Perform things like update the mutex lock owner's priority to
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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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// prevent priority inversion. Currently this is done in Mutex::ShouldWait,
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// but it should be moved to a function that is called from here.
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}
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}
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// Set the thread's waitlist to the list of objects passed to WaitSynchronizationN
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// Set the thread's waitlist to the list of objects passed to WaitSynchronizationN
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@ -351,13 +356,13 @@ static ResultCode WaitSynchronizationN(s32* out, Handle* handles, s32 handle_cou
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// This value gets set to -1 by default in this case, it is not modified after this.
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// This value gets set to -1 by default in this case, it is not modified after this.
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*out = -1;
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*out = -1;
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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
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// a signal in one of its wait objects.
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return ERR_SYNC_TIMEOUT;
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return ERR_SYNC_TIMEOUT;
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} else {
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} else {
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// Find the first object that is acquirable in the provided list of objects
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// Find the first object that is acquirable in the provided list of objects
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auto itr = std::find_if(objects.begin(), objects.end(), [](const ObjectPtr& object) {
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auto itr = std::find_if(objects.begin(), objects.end(),
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return !object->ShouldWait();
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[](const ObjectPtr& object) { return !object->ShouldWait(); });
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});
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if (itr != objects.end()) {
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if (itr != objects.end()) {
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// We found a ready object, acquire it and set the result value
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// We found a ready object, acquire it and set the result value
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@ -369,7 +374,8 @@ static ResultCode WaitSynchronizationN(s32* out, Handle* handles, s32 handle_cou
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// No objects were ready to be acquired, prepare to suspend the thread.
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// No objects were ready to be acquired, prepare to suspend the thread.
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// If a timeout value of 0 was provided, just return the Timeout error code instead of suspending the thread.
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// If a timeout value of 0 was provided, just return the Timeout error code instead of
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// suspending the thread.
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if (nano_seconds == 0)
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if (nano_seconds == 0)
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return ERR_SYNC_TIMEOUT;
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return ERR_SYNC_TIMEOUT;
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@ -385,16 +391,19 @@ static ResultCode WaitSynchronizationN(s32* out, Handle* handles, s32 handle_cou
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// Set the index of this object in the mapping of Objects -> index for this thread.
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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()] = static_cast<int>(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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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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// TODO(Subv): Perform things like update the mutex lock owner's priority to
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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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// prevent priority inversion. Currently this is done in Mutex::ShouldWait,
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// but it should be moved to a function that is called from here.
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}
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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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// Note: If no handles and no timeout were given, then the thread will deadlock, this is
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// consistent with hardware behavior.
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// Create an event to wake the thread up after the specified nanosecond delay has passed
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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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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
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// signal in one of its wait objects.
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// Otherwise we retain the default value of timeout, and -1 in the out parameter
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// Otherwise we retain the default value of timeout, and -1 in the out parameter
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thread->wait_set_output = true;
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thread->wait_set_output = true;
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*out = -1;
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*out = -1;
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