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Kernel: Correct behavior of Condition Variables to be more similar to real hardware.

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This commit ensures cond var threads act exactly as they do in the real
console. The original implementation uses an RBTree and the behavior of
cond var threads is that at the same priority level they act like a
FIFO.
This commit is contained in:
Fernando Sahmkow
2019-11-14 20:13:18 -04:00
committed by FernandoS27
parent c52f37f259
commit 2d16507f9f
5 changed files with 74 additions and 15 deletions
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20
src/core/hle/kernel/svc.cpp
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@ -1626,6 +1626,7 @@ static ResultCode WaitProcessWideKeyAtomic(Core::System& system, VAddr mutex_add
current_thread->SetWaitHandle(thread_handle);
current_thread->SetStatus(ThreadStatus::WaitCondVar);
current_thread->InvalidateWakeupCallback();
current_process->InsertConditionVariableThread(current_thread);
current_thread->WakeAfterDelay(nano_seconds);
@ -1644,21 +1645,9 @@ static ResultCode SignalProcessWideKey(Core::System& system, VAddr condition_var
ASSERT(condition_variable_addr == Common::AlignDown(condition_variable_addr, 4));
// Retrieve a list of all threads that are waiting for this condition variable.
std::vector<SharedPtr<Thread>> waiting_threads;
const auto& scheduler = system.GlobalScheduler();
const auto& thread_list = scheduler.GetThreadList();
for (const auto& thread : thread_list) {
if (thread->GetCondVarWaitAddress() == condition_variable_addr) {
waiting_threads.push_back(thread);
}
}
// Sort them by priority, such that the highest priority ones come first.
std::sort(waiting_threads.begin(), waiting_threads.end(),
[](const SharedPtr<Thread>& lhs, const SharedPtr<Thread>& rhs) {
return lhs->GetPriority() < rhs->GetPriority();
});
auto* const current_process = system.Kernel().CurrentProcess();
std::vector<SharedPtr<Thread>> waiting_threads =
current_process->GetConditionVariableThreads(condition_variable_addr);
// Only process up to 'target' threads, unless 'target' is -1, in which case process
// them all.
@ -1677,6 +1666,7 @@ static ResultCode SignalProcessWideKey(Core::System& system, VAddr condition_var
// liberate Cond Var Thread.
thread->SetCondVarWaitAddress(0);
current_process->RemoveConditionVariableThread(thread);
const std::size_t current_core = system.CurrentCoreIndex();
auto& monitor = system.Monitor();