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Merge pull request #2967 from Subv/thread_wakeup_callbacks

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Kernel/Threads: When putting a thread to wait, specify a function to execute when it is awoken
This commit is contained in:
Sebastian Valle 2017-09-30 09:12:18 -05:00 committed by GitHub
commit db752b52e8
4 changed files with 91 additions and 17 deletions
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13
src/core/hle/kernel/thread.cpp
View file

@ -247,12 +247,15 @@ static void ThreadWakeupCallback(u64 thread_handle, int cycles_late) {
if (thread->status == THREADSTATUS_WAIT_SYNCH_ANY ||
thread->status == THREADSTATUS_WAIT_SYNCH_ALL || thread->status == THREADSTATUS_WAIT_ARB) {
thread->wait_set_output = false;
// Invoke the wakeup callback before clearing the wait objects
if (thread->wakeup_callback)
thread->wakeup_callback(ThreadWakeupReason::Timeout, thread, nullptr);
// Remove the thread from each of its waiting objects' waitlists
for (auto& object : thread->wait_objects)
object->RemoveWaitingThread(thread.get());
thread->wait_objects.clear();
thread->SetWaitSynchronizationResult(RESULT_TIMEOUT);
}
thread->ResumeFromWait();
@ -278,6 +281,9 @@ void Thread::ResumeFromWait() {
break;
case THREADSTATUS_READY:
// The thread's wakeup callback must have already been cleared when the thread was first
// awoken.
ASSERT(wakeup_callback == nullptr);
// If the thread is waiting on multiple wait objects, it might be awoken more than once
// before actually resuming. We can ignore subsequent wakeups if the thread status has
// already been set to THREADSTATUS_READY.
@ -293,6 +299,8 @@ void Thread::ResumeFromWait() {
return;
}
wakeup_callback = nullptr;
ready_queue.push_back(current_priority, this);
status = THREADSTATUS_READY;
Core::System::GetInstance().PrepareReschedule();
@ -395,7 +403,6 @@ ResultVal<SharedPtr<Thread>> Thread::Create(std::string name, VAddr entry_point,
thread->nominal_priority = thread->current_priority = priority;
thread->last_running_ticks = CoreTiming::GetTicks();
thread->processor_id = processor_id;
thread->wait_set_output = false;
thread->wait_objects.clear();
thread->wait_address = 0;
thread->name = std::move(name);

15
src/core/hle/kernel/thread.h
View file

@ -41,6 +41,11 @@ enum ThreadStatus {
THREADSTATUS_DEAD ///< Run to completion, or forcefully terminated
};
enum class ThreadWakeupReason {
Signal, // The thread was woken up by WakeupAllWaitingThreads due to an object signal.
Timeout // The thread was woken up due to a wait timeout.
};
namespace Kernel {
class Mutex;
@ -199,14 +204,18 @@ public:
VAddr wait_address; ///< If waiting on an AddressArbiter, this is the arbitration address
/// True if the WaitSynchronizationN output parameter should be set on thread wakeup.
bool wait_set_output;
std::string name;
/// Handle used as userdata to reference this object when inserting into the CoreTiming queue.
Handle callback_handle;
using WakeupCallback = void(ThreadWakeupReason reason, SharedPtr<Thread> thread,
SharedPtr<WaitObject> object);
// Callback that will be invoked when the thread is resumed from a waiting state. If the thread
// was waiting via WaitSynchronizationN then the object will be the last object that became
// available. In case of a timeout, the object will be nullptr.
std::function<WakeupCallback> wakeup_callback;
private:
Thread();
~Thread() override;

11
src/core/hle/kernel/wait_object.cpp
View file

@ -71,23 +71,20 @@ void WaitObject::WakeupAllWaitingThreads() {
while (auto thread = GetHighestPriorityReadyThread()) {
if (!thread->IsSleepingOnWaitAll()) {
Acquire(thread.get());
// Set the output index of the WaitSynchronizationN call to the index of this object.
if (thread->wait_set_output) {
thread->SetWaitSynchronizationOutput(thread->GetWaitObjectIndex(this));
thread->wait_set_output = false;
}
} else {
for (auto& object : thread->wait_objects) {
object->Acquire(thread.get());
}
// Note: This case doesn't update the output index of WaitSynchronizationN.
}
// Invoke the wakeup callback before clearing the wait objects
if (thread->wakeup_callback)
thread->wakeup_callback(ThreadWakeupReason::Signal, thread, this);
for (auto& object : thread->wait_objects)
object->RemoveWaitingThread(thread.get());
thread->wait_objects.clear();
thread->SetWaitSynchronizationResult(RESULT_SUCCESS);
thread->ResumeFromWait();
}
}

69
src/core/hle/svc.cpp
View file

@ -271,6 +271,24 @@ static ResultCode WaitSynchronization1(Kernel::Handle handle, s64 nano_seconds)
// Create an event to wake the thread up after the specified nanosecond delay has passed
thread->WakeAfterDelay(nano_seconds);
thread->wakeup_callback = [](ThreadWakeupReason reason,
Kernel::SharedPtr<Kernel::Thread> thread,
Kernel::SharedPtr<Kernel::WaitObject> object) {
ASSERT(thread->status == THREADSTATUS_WAIT_SYNCH_ANY);
if (reason == ThreadWakeupReason::Timeout) {
thread->SetWaitSynchronizationResult(Kernel::RESULT_TIMEOUT);
return;
}
ASSERT(reason == ThreadWakeupReason::Signal);
thread->SetWaitSynchronizationResult(RESULT_SUCCESS);
// WaitSynchronization1 doesn't have an output index like WaitSynchronizationN, so we
// don't have to do anything else here.
};
Core::System::GetInstance().PrepareReschedule();
// Note: The output of this SVC will be set to RESULT_SUCCESS if the thread
@ -344,6 +362,23 @@ static ResultCode WaitSynchronizationN(s32* out, Kernel::Handle* handles, s32 ha
// Create an event to wake the thread up after the specified nanosecond delay has passed
thread->WakeAfterDelay(nano_seconds);
thread->wakeup_callback = [](ThreadWakeupReason reason,
Kernel::SharedPtr<Kernel::Thread> thread,
Kernel::SharedPtr<Kernel::WaitObject> object) {
ASSERT(thread->status == THREADSTATUS_WAIT_SYNCH_ALL);
if (reason == ThreadWakeupReason::Timeout) {
thread->SetWaitSynchronizationResult(Kernel::RESULT_TIMEOUT);
return;
}
ASSERT(reason == ThreadWakeupReason::Signal);
thread->SetWaitSynchronizationResult(RESULT_SUCCESS);
// The wait_all case does not update the output index.
};
Core::System::GetInstance().PrepareReschedule();
// This value gets set to -1 by default in this case, it is not modified after this.
@ -389,12 +424,28 @@ static ResultCode WaitSynchronizationN(s32* out, Kernel::Handle* handles, s32 ha
// Create an event to wake the thread up after the specified nanosecond delay has passed
thread->WakeAfterDelay(nano_seconds);
thread->wakeup_callback = [](ThreadWakeupReason reason,
Kernel::SharedPtr<Kernel::Thread> thread,
Kernel::SharedPtr<Kernel::WaitObject> object) {
ASSERT(thread->status == THREADSTATUS_WAIT_SYNCH_ANY);
if (reason == ThreadWakeupReason::Timeout) {
thread->SetWaitSynchronizationResult(Kernel::RESULT_TIMEOUT);
return;
}
ASSERT(reason == ThreadWakeupReason::Signal);
thread->SetWaitSynchronizationResult(RESULT_SUCCESS);
thread->SetWaitSynchronizationOutput(thread->GetWaitObjectIndex(object.get()));
};
Core::System::GetInstance().PrepareReschedule();
// 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;
*out = -1;
return Kernel::RESULT_TIMEOUT;
}
@ -483,8 +534,6 @@ static ResultCode ReplyAndReceive(s32* index, Kernel::Handle* handles, s32 handl
// No objects were ready to be acquired, prepare to suspend the thread.
// TODO(Subv): Perform IPC translation upon wakeup.
// Put the thread to sleep
thread->status = THREADSTATUS_WAIT_SYNCH_ANY;
@ -496,12 +545,24 @@ static ResultCode ReplyAndReceive(s32* index, Kernel::Handle* handles, s32 handl
thread->wait_objects = std::move(objects);
thread->wakeup_callback = [](ThreadWakeupReason reason,
Kernel::SharedPtr<Kernel::Thread> thread,
Kernel::SharedPtr<Kernel::WaitObject> object) {
ASSERT(thread->status == THREADSTATUS_WAIT_SYNCH_ANY);
ASSERT(reason == ThreadWakeupReason::Signal);
thread->SetWaitSynchronizationResult(RESULT_SUCCESS);
thread->SetWaitSynchronizationOutput(thread->GetWaitObjectIndex(object.get()));
// TODO(Subv): Perform IPC translation upon wakeup.
};
Core::System::GetInstance().PrepareReschedule();
// 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, or to 0xC8A01836 if there was a translation error.
// By default the index is set to -1.
thread->wait_set_output = true;
*index = -1;
return RESULT_SUCCESS;
}