From 17b29d8865ea4d96c18f7e1671bd6d0f01eab95f Mon Sep 17 00:00:00 2001 From: Subv Date: Thu, 8 Dec 2016 10:34:53 -0500 Subject: WaitSynch: Removed unused variables and reduced SharedPtr copies. Define a variable with the value of the sync timeout error code. Use a boost::flat_map instead of an unordered_map to hold the equivalence of objects and wait indices in a WaitSynchN call. --- src/core/hle/kernel/kernel.cpp | 14 ++---- src/core/hle/kernel/kernel.h | 5 +- src/core/hle/kernel/thread.h | 5 +- src/core/hle/svc.cpp | 105 ++++++++++++++++++----------------------- 4 files changed, 56 insertions(+), 73 deletions(-) (limited to 'src/core/hle') diff --git a/src/core/hle/kernel/kernel.cpp b/src/core/hle/kernel/kernel.cpp index b8b69f9d0..653697843 100644 --- a/src/core/hle/kernel/kernel.cpp +++ b/src/core/hle/kernel/kernel.cpp @@ -34,14 +34,11 @@ void WaitObject::RemoveWaitingThread(Thread* thread) { SharedPtr WaitObject::GetHighestPriorityReadyThread() { // Remove the threads that are ready or already running from our waitlist - boost::range::remove_erase_if(waiting_threads, [](const SharedPtr& thread) -> bool { + boost::range::remove_erase_if(waiting_threads, [](const SharedPtr& thread) { return thread->status == THREADSTATUS_RUNNING || thread->status == THREADSTATUS_READY; }); - if (waiting_threads.empty()) - return nullptr; - - SharedPtr candidate = nullptr; + Thread* candidate = nullptr; s32 candidate_priority = THREADPRIO_LOWEST + 1; for (const auto& thread : waiting_threads) { @@ -52,7 +49,7 @@ SharedPtr WaitObject::GetHighestPriorityReadyThread() { return object->ShouldWait(); }); if (ready_to_run) { - candidate = thread; + candidate = thread.get(); candidate_priority = thread->current_priority; } } @@ -61,9 +58,8 @@ SharedPtr WaitObject::GetHighestPriorityReadyThread() { } void WaitObject::WakeupAllWaitingThreads() { - // Wake up all threads that can be awoken, in priority order while (auto thread = GetHighestPriorityReadyThread()) { - if (thread->wait_objects.empty()) { + if (!thread->IsSleepingOnWaitAll()) { Acquire(); // Set the output index of the WaitSynchronizationN call to the index of this object. if (thread->wait_set_output) { @@ -73,7 +69,6 @@ void WaitObject::WakeupAllWaitingThreads() { } else { for (auto object : thread->wait_objects) { object->Acquire(); - // Remove the thread from the object's waitlist object->RemoveWaitingThread(thread.get()); } // Note: This case doesn't update the output index of WaitSynchronizationN. @@ -81,7 +76,6 @@ void WaitObject::WakeupAllWaitingThreads() { thread->wait_objects.clear(); } - // Set the result of the call to WaitSynchronization to RESULT_SUCCESS thread->SetWaitSynchronizationResult(RESULT_SUCCESS); thread->ResumeFromWait(); // Note: Removing the thread from the object's waitlist will be done by GetHighestPriorityReadyThread diff --git a/src/core/hle/kernel/kernel.h b/src/core/hle/kernel/kernel.h index eb5a3bf7e..4227d2373 100644 --- a/src/core/hle/kernel/kernel.h +++ b/src/core/hle/kernel/kernel.h @@ -152,7 +152,10 @@ public: */ void RemoveWaitingThread(Thread* thread); - /// Wake up all threads waiting on this object + /** + * Wake up all threads waiting on this object that can be awoken, in priority order, + * and set the synchronization result and output of the thread. + */ void WakeupAllWaitingThreads(); /// Obtains the highest priority thread that is ready to run from this object's waiting list. diff --git a/src/core/hle/kernel/thread.h b/src/core/hle/kernel/thread.h index 1b29fb3a3..4c254cb9d 100644 --- a/src/core/hle/kernel/thread.h +++ b/src/core/hle/kernel/thread.h @@ -7,6 +7,7 @@ #include #include #include +#include #include #include "common/common_types.h" #include "core/core.h" @@ -153,7 +154,7 @@ public: * its wait list to become ready, as a result of a WaitSynchronizationN call * with wait_all = true, or a ReplyAndReceive call. */ - bool IsWaitingAll() const { + bool IsSleepingOnWaitAll() const { return !wait_objects.empty(); } @@ -183,7 +184,7 @@ public: /// This is only populated when the thread should wait for all the objects to become ready. std::vector> wait_objects; - std::unordered_map wait_objects_index; ///< Mapping of Object ids to their position in the last waitlist that this object waited on. + boost::container::flat_map wait_objects_index; ///< Mapping of Object ids to their position in the last waitlist that this object waited on. VAddr wait_address; ///< If waiting on an AddressArbiter, this is the arbitration address diff --git a/src/core/hle/svc.cpp b/src/core/hle/svc.cpp index c06df84b3..14da09883 100644 --- a/src/core/hle/svc.cpp +++ b/src/core/hle/svc.cpp @@ -41,6 +41,9 @@ const ResultCode ERR_PORT_NAME_TOO_LONG(ErrorDescription(30), ErrorModule::OS, ErrorSummary::InvalidArgument, ErrorLevel::Usage); // 0xE0E0181E +const ResultCode ERR_SYNC_TIMEOUT(ErrorDescription::Timeout, ErrorModule::OS, + ErrorSummary::StatusChanged, ErrorLevel::Info); + const ResultCode ERR_MISALIGNED_ADDRESS{// 0xE0E01BF1 ErrorDescription::MisalignedAddress, ErrorModule::OS, ErrorSummary::InvalidArgument, ErrorLevel::Usage}; @@ -257,11 +260,8 @@ static ResultCode WaitSynchronization1(Handle handle, s64 nano_seconds) { if (object->ShouldWait()) { - if (nano_seconds == 0) { - return ResultCode(ErrorDescription::Timeout, ErrorModule::OS, - ErrorSummary::StatusChanged, - ErrorLevel::Info); - } + if (nano_seconds == 0) + return ERR_SYNC_TIMEOUT; object->AddWaitingThread(thread); // TODO(Subv): Perform things like update the mutex lock owner's priority to prevent priority inversion. @@ -273,9 +273,7 @@ static ResultCode WaitSynchronization1(Handle handle, s64 nano_seconds) { // Note: The output of this SVC will be set to RESULT_SUCCESS if the thread resumes due to a signal in its wait objects. // Otherwise we retain the default value of timeout. - return ResultCode(ErrorDescription::Timeout, ErrorModule::OS, - ErrorSummary::StatusChanged, - ErrorLevel::Info); + return ERR_SYNC_TIMEOUT; } object->Acquire(); @@ -286,8 +284,6 @@ static ResultCode WaitSynchronization1(Handle handle, s64 nano_seconds) { /// Wait for the given handles to synchronize, timeout after the specified nanoseconds static ResultCode WaitSynchronizationN(s32* out, Handle* handles, s32 handle_count, bool wait_all, s64 nano_seconds) { - bool wait_thread = !wait_all; - int handle_index = 0; Kernel::Thread* thread = Kernel::GetCurrentThread(); // Check if 'handles' is invalid @@ -305,7 +301,6 @@ static ResultCode WaitSynchronizationN(s32* out, Handle* handles, s32 handle_cou ErrorSummary::InvalidArgument, ErrorLevel::Usage); using ObjectPtr = Kernel::SharedPtr; - std::vector objects(handle_count); for (int i = 0; i < handle_count; ++i) { @@ -320,100 +315,90 @@ static ResultCode WaitSynchronizationN(s32* out, Handle* handles, s32 handle_cou // It will be repopulated later in the wait_all = false case. thread->wait_objects_index.clear(); - if (!wait_all) { - // Find the first object that is acquireable in the provided list of objects - auto itr = std::find_if(objects.begin(), objects.end(), [](const ObjectPtr& object) { + if (wait_all) { + bool all_available = std::all_of(objects.begin(), objects.end(), [](const ObjectPtr& object) { return !object->ShouldWait(); }); - - if (itr != objects.end()) { - // We found a ready object, acquire it and set the result value - ObjectPtr object = *itr; - object->Acquire(); - *out = std::distance(objects.begin(), itr); + if (all_available) { + // We can acquire all objects right now, do so. + for (auto object : objects) + object->Acquire(); + // Note: In this case, the `out` parameter is not set, and retains whatever value it had before. return RESULT_SUCCESS; } - // No objects were ready to be acquired, prepare to suspend the thread. + // Not all objects were available right now, prepare to suspend the thread. // If a timeout value of 0 was provided, just return the Timeout error code instead of suspending the thread. - if (nano_seconds == 0) { - return ResultCode(ErrorDescription::Timeout, ErrorModule::OS, - ErrorSummary::StatusChanged, - ErrorLevel::Info); - } + if (nano_seconds == 0) + return ERR_SYNC_TIMEOUT; // Put the thread to sleep thread->status = THREADSTATUS_WAIT_SYNCH; - // Clear the thread's waitlist, we won't use it for wait_all = false - thread->wait_objects.clear(); - // Add the thread to each of the objects' waiting threads. - for (size_t i = 0; i < objects.size(); ++i) { - ObjectPtr object = objects[i]; - // Set the index of this object in the mapping of Objects -> index for this thread. - thread->wait_objects_index[object->GetObjectId()] = static_cast(i); + for (auto& object : objects) { object->AddWaitingThread(thread); // TODO(Subv): Perform things like update the mutex lock owner's priority to prevent priority inversion. // Currently this is done in Mutex::ShouldWait, but it should be moved to a function that is called from here. } - // Note: If no handles and no timeout were given, then the thread will deadlock, this is consistent with hardware behavior. + // Set the thread's waitlist to the list of objects passed to WaitSynchronizationN + thread->wait_objects = std::move(objects); // Create an event to wake the thread up after the specified nanosecond delay has passed thread->WakeAfterDelay(nano_seconds); - // 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. - // Otherwise we retain the default value of timeout, and -1 in the out parameter - thread->wait_set_output = true; + // This value gets set to -1 by default in this case, it is not modified after this. *out = -1; - return ResultCode(ErrorDescription::Timeout, ErrorModule::OS, - ErrorSummary::StatusChanged, - ErrorLevel::Info); + // 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. + return ERR_SYNC_TIMEOUT; } else { - bool all_available = std::all_of(objects.begin(), objects.end(), [](const ObjectPtr& object) { + // Find the first object that is acquirable in the provided list of objects + auto itr = std::find_if(objects.begin(), objects.end(), [](const ObjectPtr& object) { return !object->ShouldWait(); }); - if (all_available) { - // We can acquire all objects right now, do so. - for (auto object : objects) - object->Acquire(); - // Note: In this case, the `out` parameter is not set, and retains whatever value it had before. + + if (itr != objects.end()) { + // We found a ready object, acquire it and set the result value + Kernel::WaitObject* object = itr->get(); + object->Acquire(); + *out = std::distance(objects.begin(), itr); return RESULT_SUCCESS; } - // Not all objects were available right now, prepare to suspend the thread. + // No objects were ready to be acquired, prepare to suspend the thread. // If a timeout value of 0 was provided, just return the Timeout error code instead of suspending the thread. - if (nano_seconds == 0) { - return ResultCode(ErrorDescription::Timeout, ErrorModule::OS, - ErrorSummary::StatusChanged, - ErrorLevel::Info); - } + if (nano_seconds == 0) + return ERR_SYNC_TIMEOUT; // Put the thread to sleep thread->status = THREADSTATUS_WAIT_SYNCH; - // Set the thread's waitlist to the list of objects passed to WaitSynchronizationN - thread->wait_objects = objects; + // Clear the thread's waitlist, we won't use it for wait_all = false + thread->wait_objects.clear(); // Add the thread to each of the objects' waiting threads. - for (auto object : objects) { + for (size_t i = 0; i < objects.size(); ++i) { + Kernel::WaitObject* object = objects[i].get(); + // Set the index of this object in the mapping of Objects -> index for this thread. + thread->wait_objects_index[object->GetObjectId()] = static_cast(i); object->AddWaitingThread(thread); // TODO(Subv): Perform things like update the mutex lock owner's priority to prevent priority inversion. // Currently this is done in Mutex::ShouldWait, but it should be moved to a function that is called from here. } + // Note: If no handles and no timeout were given, then the thread will deadlock, this is consistent with hardware behavior. + // Create an event to wake the thread up after the specified nanosecond delay has passed thread->WakeAfterDelay(nano_seconds); - // This value gets set to -1 by default in this case, it is not modified after this. - *out = -1; // 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. - return ResultCode(ErrorDescription::Timeout, ErrorModule::OS, - ErrorSummary::StatusChanged, - ErrorLevel::Info); + // Otherwise we retain the default value of timeout, and -1 in the out parameter + thread->wait_set_output = true; + *out = -1; + return ERR_SYNC_TIMEOUT; } } -- cgit v1.2.3