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Kernel: Allow chaining WaitSynchronization calls inside a wakeup callback.

This commit is contained in:
Subv 2018-01-08 11:35:03 -05:00 committed by bunnei
parent 1b9ed033fc
commit 2a3f8e8484
4 changed files with 78 additions and 30 deletions
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46
src/core/hle/kernel/svc.cpp
View File

@ -120,17 +120,19 @@ static ResultCode GetProcessId(u32* process_id, Handle process_handle) {
}
/// Default thread wakeup callback for WaitSynchronization
static void DefaultThreadWakeupCallback(ThreadWakeupReason reason, SharedPtr<Thread> thread,
SharedPtr<WaitObject> object) {
static bool DefaultThreadWakeupCallback(ThreadWakeupReason reason, SharedPtr<Thread> thread,
SharedPtr<WaitObject> object, size_t index) {
ASSERT(thread->status == THREADSTATUS_WAIT_SYNCH_ANY);
if (reason == ThreadWakeupReason::Timeout) {
thread->SetWaitSynchronizationResult(RESULT_TIMEOUT);
return;
return true;
}
ASSERT(reason == ThreadWakeupReason::Signal);
thread->SetWaitSynchronizationResult(RESULT_SUCCESS);
return true;
};
/// Wait for a kernel object to synchronize, timeout after the specified nanoseconds
@ -499,20 +501,44 @@ static ResultCode WaitProcessWideKeyAtomic(VAddr mutex_addr, VAddr semaphore_add
ASSERT(semaphore->available_count == 0);
ASSERT(semaphore->mutex_addr == mutex_addr);
CASCADE_CODE(WaitSynchronization1(
semaphore, thread.get(), nano_seconds,
[mutex](ThreadWakeupReason reason, SharedPtr<Thread> thread, SharedPtr<WaitObject> object) {
auto wakeup_callback = [mutex, nano_seconds](ThreadWakeupReason reason,
SharedPtr<Thread> thread,
SharedPtr<WaitObject> object, size_t index) {
ASSERT(thread->status == THREADSTATUS_WAIT_SYNCH_ANY);
if (reason == ThreadWakeupReason::Timeout) {
thread->SetWaitSynchronizationResult(RESULT_TIMEOUT);
return;
return true;
}
ASSERT(reason == ThreadWakeupReason::Signal);
thread->SetWaitSynchronizationResult(WaitSynchronization1(mutex, thread.get()));
thread->SetWaitSynchronizationOutput(thread->GetWaitObjectIndex(object.get()));
}));
// Now try to acquire the mutex and don't resume if it's not available.
if (!mutex->ShouldWait(thread.get())) {
mutex->Acquire(thread.get());
thread->SetWaitSynchronizationResult(RESULT_SUCCESS);
return true;
}
if (nano_seconds == 0) {
thread->SetWaitSynchronizationResult(RESULT_TIMEOUT);
return true;
}
thread->wait_objects = {mutex};
mutex->AddWaitingThread(thread);
thread->status = THREADSTATUS_WAIT_SYNCH_ANY;
// Create an event to wake the thread up after the
// specified nanosecond delay has passed
thread->WakeAfterDelay(nano_seconds);
thread->wakeup_callback = DefaultThreadWakeupCallback;
Core::System::GetInstance().PrepareReschedule();
return false;
};
CASCADE_CODE(WaitSynchronization1(semaphore, thread.get(), nano_seconds, wakeup_callback));
mutex->Release(thread.get());

23
src/core/hle/kernel/thread.cpp
View File

@ -244,19 +244,22 @@ static void ThreadWakeupCallback(u64 thread_handle, int cycles_late) {
return;
}
bool resume = true;
if (thread->status == THREADSTATUS_WAIT_SYNCH_ANY ||
thread->status == THREADSTATUS_WAIT_SYNCH_ALL || thread->status == THREADSTATUS_WAIT_ARB) {
// 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();
// Invoke the wakeup callback before clearing the wait objects
if (thread->wakeup_callback)
resume = thread->wakeup_callback(ThreadWakeupReason::Timeout, thread, nullptr, 0);
}
if (resume)
thread->ResumeFromWait();
}
@ -268,6 +271,10 @@ void Thread::WakeAfterDelay(s64 nanoseconds) {
CoreTiming::ScheduleEvent(nsToCycles(nanoseconds), ThreadWakeupEventType, callback_handle);
}
void Thread::CancelWakeupTimer() {
CoreTiming::UnscheduleEvent(ThreadWakeupEventType, callback_handle);
}
void Thread::ResumeFromWait() {
ASSERT_MSG(wait_objects.empty(), "Thread is waking up while waiting for objects");
@ -444,7 +451,8 @@ ResultVal<SharedPtr<Thread>> Thread::Create(std::string name, VAddr entry_point,
// Map the page to the current process' address space.
// TODO(Subv): Find the correct MemoryState for this region.
vm_manager.MapMemoryBlock(Memory::TLS_AREA_VADDR + available_page * Memory::PAGE_SIZE,
linheap_memory, offset, Memory::PAGE_SIZE, MemoryState::ThreadLocalStorage);
linheap_memory, offset, Memory::PAGE_SIZE,
MemoryState::ThreadLocalStorage);
}
// Mark the slot as used
@ -501,7 +509,8 @@ SharedPtr<Thread> SetupMainThread(VAddr entry_point, u32 priority,
SharedPtr<Thread> thread = std::move(thread_res).Unwrap();
// Register 1 must be a handle to the main thread
thread->guest_handle = Kernel::g_handle_table.Create(thread).Unwrap();;
thread->guest_handle = Kernel::g_handle_table.Create(thread).Unwrap();
thread->context.cpu_registers[1] = thread->guest_handle;
// Threads by default are dormant, wake up the main thread so it runs when the scheduler fires
@ -572,4 +581,4 @@ const std::vector<SharedPtr<Thread>>& GetThreadList() {
return thread_list;
}
} // namespace
} // namespace Kernel

10
src/core/hle/kernel/thread.h
View File

@ -128,6 +128,9 @@ public:
*/
void WakeAfterDelay(s64 nanoseconds);
/// Cancel any outstanding wakeup events for this thread
void CancelWakeupTimer();
/**
* Sets the result after the thread awakens (from either WaitSynchronization SVC)
* @param result Value to set to the returned result
@ -218,8 +221,8 @@ public:
/// 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);
using WakeupCallback = bool(ThreadWakeupReason reason, SharedPtr<Thread> thread,
SharedPtr<WaitObject> object, size_t index);
// 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.
@ -237,7 +240,8 @@ private:
* @param owner_process The parent process for the main thread
* @return A shared pointer to the main thread
*/
SharedPtr<Thread> SetupMainThread(VAddr entry_point, u32 priority, SharedPtr<Process> owner_process);
SharedPtr<Thread> SetupMainThread(VAddr entry_point, u32 priority,
SharedPtr<Process> owner_process);
/**
* Returns whether there are any threads that are ready to run.

15
src/core/hle/kernel/wait_object.cpp
View File

@ -68,6 +68,8 @@ SharedPtr<Thread> WaitObject::GetHighestPriorityReadyThread() {
}
void WaitObject::WakeupWaitingThread(SharedPtr<Thread> thread) {
ASSERT(!ShouldWait(thread.get()));
if (!thread)
return;
@ -75,18 +77,25 @@ void WaitObject::WakeupWaitingThread(SharedPtr<Thread> thread) {
Acquire(thread.get());
} else {
for (auto& object : thread->wait_objects) {
ASSERT(!object->ShouldWait(thread.get()));
object->Acquire(thread.get());
}
}
// Invoke the wakeup callback before clearing the wait objects
if (thread->wakeup_callback)
thread->wakeup_callback(ThreadWakeupReason::Signal, thread, this);
size_t index = thread->GetWaitObjectIndex(this);
for (auto& object : thread->wait_objects)
object->RemoveWaitingThread(thread.get());
thread->wait_objects.clear();
thread->CancelWakeupTimer();
bool resume = true;
if (thread->wakeup_callback)
resume = thread->wakeup_callback(ThreadWakeupReason::Signal, thread, this, index);
if (resume)
thread->ResumeFromWait();
}