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Kernel: Properly implemented svcWaitProcessWideKey and svcSignalProcessWideKey 

They work in tandem with guest code to provide synchronization primitives along with svcArbitrateLock/Unlock
This commit is contained in:
Subv 2018-04-20 14:39:28 -05:00
parent e81a2080eb
commit b18ccf9399
1 changed files with 46 additions and 83 deletions
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129
src/core/hle/kernel/svc.cpp
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@ -616,77 +616,18 @@ static ResultCode WaitProcessWideKeyAtomic(VAddr mutex_addr, VAddr condition_var
SharedPtr<Thread> thread = g_handle_table.Get<Thread>(thread_handle);
ASSERT(thread);
SharedPtr<Mutex> mutex = g_object_address_table.Get<Mutex>(mutex_addr);
if (!mutex) {
// Create a new mutex for the specified address if one does not already exist
mutex = Mutex::Create(thread, mutex_addr);
mutex->name = Common::StringFromFormat("mutex-%llx", mutex_addr);
}
CASCADE_CODE(Mutex::Release(mutex_addr));
SharedPtr<ConditionVariable> condition_variable =
g_object_address_table.Get<ConditionVariable>(condition_variable_addr);
if (!condition_variable) {
// Create a new condition_variable for the specified address if one does not already exist
condition_variable = ConditionVariable::Create(condition_variable_addr).Unwrap();
condition_variable->name =
Common::StringFromFormat("condition-variable-%llx", condition_variable_addr);
}
SharedPtr<Thread> current_thread = GetCurrentThread();
current_thread->condvar_wait_address = condition_variable_addr;
current_thread->mutex_wait_address = mutex_addr;
current_thread->wait_handle = thread_handle;
current_thread->status = THREADSTATUS_WAIT_MUTEX;
current_thread->wakeup_callback = nullptr;
if (condition_variable->mutex_addr) {
// Previously created the ConditionVariable using WaitProcessWideKeyAtomic, verify
// everything is correct
ASSERT(condition_variable->mutex_addr == mutex_addr);
} else {
// Previously created the ConditionVariable using SignalProcessWideKey, set the mutex
// associated with it
condition_variable->mutex_addr = mutex_addr;
}
if (mutex->GetOwnerHandle()) {
// Release the mutex if the current thread is holding it
mutex->Release(thread.get());
}
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 true;
}
ASSERT(reason == ThreadWakeupReason::Signal);
// 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(condition_variable, thread.get(), nano_seconds, wakeup_callback));
current_thread->WakeAfterDelay(nano_seconds);
Core::System::GetInstance().PrepareReschedule();
return RESULT_SUCCESS;
}
@ -695,24 +636,46 @@ static ResultCode SignalProcessWideKey(VAddr condition_variable_addr, s32 target
LOG_TRACE(Kernel_SVC, "called, condition_variable_addr=0x%llx, target=0x%08x",
condition_variable_addr, target);
// Wakeup all or one thread - Any other value is unimplemented
ASSERT(target == -1 || target == 1);
u32 processed = 0;
auto& thread_list = Core::System::GetInstance().Scheduler().GetThreadList();
SharedPtr<ConditionVariable> condition_variable =
g_object_address_table.Get<ConditionVariable>(condition_variable_addr);
if (!condition_variable) {
// Create a new condition_variable for the specified address if one does not already exist
condition_variable = ConditionVariable::Create(condition_variable_addr).Unwrap();
condition_variable->name =
Common::StringFromFormat("condition-variable-%llx", condition_variable_addr);
}
for (auto& thread : thread_list) {
if (thread->condvar_wait_address != condition_variable_addr)
continue;
CASCADE_CODE(condition_variable->Release(target));
// Only process up to 'target' threads, unless 'target' is -1, in which case process
// them all.
if (target != -1 && processed >= target)
break;
if (condition_variable->mutex_addr) {
// If a mutex was created for this condition_variable, wait the current thread on it
SharedPtr<Mutex> mutex = g_object_address_table.Get<Mutex>(condition_variable->mutex_addr);
return WaitSynchronization1(mutex, GetCurrentThread());
// If the mutex is not yet acquired, acquire it.
u32 mutex_val = Memory::Read32(thread->mutex_wait_address);
if (mutex_val == 0) {
// We were able to acquire the mutex, resume this thread.
Memory::Write32(thread->mutex_wait_address, thread->wait_handle);
ASSERT(thread->status == THREADSTATUS_WAIT_MUTEX);
thread->ResumeFromWait();
thread->mutex_wait_address = 0;
thread->condvar_wait_address = 0;
thread->wait_handle = 0;
} else {
// Couldn't acquire the mutex, block the thread.
Handle owner_handle = static_cast<Handle>(mutex_val & Mutex::MutexOwnerMask);
auto owner = g_handle_table.Get<Thread>(owner_handle);
ASSERT(owner);
ASSERT(thread->status != THREADSTATUS_RUNNING);
thread->status = THREADSTATUS_WAIT_MUTEX;
thread->wakeup_callback = nullptr;
// Signal that the mutex now has a waiting thread.
Memory::Write32(thread->mutex_wait_address, mutex_val | Mutex::MutexHasWaitersFlag);
Core::System::GetInstance().PrepareReschedule();
}
++processed;
}
return RESULT_SUCCESS;