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Kernel/Arbiters: When doing ArbitrateAddress(Signal), always pick the highest priority thread, using the first one that was put to sleep if more than one thread with the same highest priority exists.

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This is consistent with hardware behavior as shown by this test https://gist.github.com/ds84182/40e46129bd38b46a5100f15f96ba5eaf
This commit is contained in:
Subv 2017-11-08 18:07:22 -05:00
parent 7d12aaaa20
commit c68adb787b
4 changed files with 82 additions and 64 deletions
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50
src/core/hle/kernel/thread.cpp
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@ -67,16 +67,6 @@ Thread* GetCurrentThread() {
return current_thread.get();
}
/**
* Check if the specified thread is waiting on the specified address to be arbitrated
* @param thread The thread to test
* @param wait_address The address to test against
* @return True if the thread is waiting, false otherwise
*/
static bool CheckWait_AddressArbiter(const Thread* thread, VAddr wait_address) {
return thread->status == THREADSTATUS_WAIT_ARB && wait_address == thread->wait_address;
}
void Thread::Stop() {
// Cancel any outstanding wakeup events for this thread
CoreTiming::UnscheduleEvent(ThreadWakeupEventType, callback_handle);
@ -109,40 +99,6 @@ void Thread::Stop() {
Kernel::g_current_process->tls_slots[tls_page].reset(tls_slot);
}
Thread* ArbitrateHighestPriorityThread(u32 address) {
Thread* highest_priority_thread = nullptr;
u32 priority = THREADPRIO_LOWEST;
// Iterate through threads, find highest priority thread that is waiting to be arbitrated...
for (auto& thread : thread_list) {
if (!CheckWait_AddressArbiter(thread.get(), address))
continue;
if (thread == nullptr)
continue;
if (thread->current_priority <= priority) {
highest_priority_thread = thread.get();
priority = thread->current_priority;
}
}
// If a thread was arbitrated, resume it
if (nullptr != highest_priority_thread) {
highest_priority_thread->ResumeFromWait();
}
return highest_priority_thread;
}
void ArbitrateAllThreads(u32 address) {
// Resume all threads found to be waiting on the address
for (auto& thread : thread_list) {
if (CheckWait_AddressArbiter(thread.get(), address))
thread->ResumeFromWait();
}
}
/**
* Switches the CPU's active thread context to that of the specified thread
* @param new_thread The thread to switch to
@ -220,12 +176,6 @@ void WaitCurrentThread_Sleep() {
thread->status = THREADSTATUS_WAIT_SLEEP;
}
void WaitCurrentThread_ArbitrateAddress(VAddr wait_address) {
Thread* thread = GetCurrentThread();
thread->wait_address = wait_address;
thread->status = THREADSTATUS_WAIT_ARB;
}
void ExitCurrentThread() {
Thread* thread = GetCurrentThread();
thread->Stop();