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Merge pull request #495 from bunnei/fix-waitsynch 

Fix WaitSynchronization
This commit is contained in:
bunnei 2015-01-21 21:09:47 -05:00
parent 0c7498545f 731154f79e
commit 24a63662ba
15 changed files with 474 additions and 371 deletions
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15
src/core/hle/kernel/address_arbiter.cpp
View File

@ -30,7 +30,8 @@ public:
/// Arbitrate an address
ResultCode ArbitrateAddress(Handle handle, ArbitrationType type, u32 address, s32 value, u64 nanoseconds) {
Object* object = Kernel::g_handle_table.GetGeneric(handle).get();
AddressArbiter* object = Kernel::g_handle_table.Get<AddressArbiter>(handle).get();
if (object == nullptr)
return InvalidHandle(ErrorModule::Kernel);
@ -40,24 +41,24 @@ ResultCode ArbitrateAddress(Handle handle, ArbitrationType type, u32 address, s3
case ArbitrationType::Signal:
// Negative value means resume all threads
if (value < 0) {
ArbitrateAllThreads(object, address);
ArbitrateAllThreads(address);
} else {
// Resume first N threads
for(int i = 0; i < value; i++)
ArbitrateHighestPriorityThread(object, address);
ArbitrateHighestPriorityThread(address);
}
break;
// Wait current thread (acquire the arbiter)...
case ArbitrationType::WaitIfLessThan:
if ((s32)Memory::Read32(address) <= value) {
Kernel::WaitCurrentThread(WAITTYPE_ARB, object, address);
Kernel::WaitCurrentThread_ArbitrateAddress(address);
HLE::Reschedule(__func__);
}
break;
case ArbitrationType::WaitIfLessThanWithTimeout:
if ((s32)Memory::Read32(address) <= value) {
Kernel::WaitCurrentThread(WAITTYPE_ARB, object, address);
Kernel::WaitCurrentThread_ArbitrateAddress(address);
Kernel::WakeThreadAfterDelay(GetCurrentThread(), nanoseconds);
HLE::Reschedule(__func__);
}
@ -67,7 +68,7 @@ ResultCode ArbitrateAddress(Handle handle, ArbitrationType type, u32 address, s3
s32 memory_value = Memory::Read32(address) - 1;
Memory::Write32(address, memory_value);
if (memory_value <= value) {
Kernel::WaitCurrentThread(WAITTYPE_ARB, object, address);
Kernel::WaitCurrentThread_ArbitrateAddress(address);
HLE::Reschedule(__func__);
}
break;
@ -77,7 +78,7 @@ ResultCode ArbitrateAddress(Handle handle, ArbitrationType type, u32 address, s3
s32 memory_value = Memory::Read32(address) - 1;
Memory::Write32(address, memory_value);
if (memory_value <= value) {
Kernel::WaitCurrentThread(WAITTYPE_ARB, object, address);
Kernel::WaitCurrentThread_ArbitrateAddress(address);
Kernel::WakeThreadAfterDelay(GetCurrentThread(), nanoseconds);
HLE::Reschedule(__func__);
}

108
src/core/hle/kernel/event.cpp
View File

@ -14,7 +14,7 @@
namespace Kernel {
class Event : public Object {
class Event : public WaitObject {
public:
std::string GetTypeName() const override { return "Event"; }
std::string GetName() const override { return name; }
@ -25,99 +25,40 @@ public:
ResetType intitial_reset_type; ///< ResetType specified at Event initialization
ResetType reset_type; ///< Current ResetType
bool locked; ///< Event signal wait
bool permanent_locked; ///< Hack - to set event permanent state (for easy passthrough)
std::vector<Handle> waiting_threads; ///< Threads that are waiting for the event
bool signaled; ///< Whether the event has already been signaled
std::string name; ///< Name of event (optional)
ResultVal<bool> WaitSynchronization() override {
bool wait = locked;
if (locked) {
Handle thread = GetCurrentThread()->GetHandle();
if (std::find(waiting_threads.begin(), waiting_threads.end(), thread) == waiting_threads.end()) {
waiting_threads.push_back(thread);
}
Kernel::WaitCurrentThread(WAITTYPE_EVENT, this);
}
if (reset_type != RESETTYPE_STICKY && !permanent_locked) {
locked = true;
}
return MakeResult<bool>(wait);
bool ShouldWait() override {
return !signaled;
}
void Acquire() override {
_assert_msg_(Kernel, !ShouldWait(), "object unavailable!");
// Release the event if it's not sticky...
if (reset_type != RESETTYPE_STICKY)
signaled = false;
}
};
/**
* Hackish function to set an events permanent lock state, used to pass through synch blocks
* @param handle Handle to event to change
* @param permanent_locked Boolean permanent locked value to set event
* @return Result of operation, 0 on success, otherwise error code
*/
ResultCode SetPermanentLock(Handle handle, const bool permanent_locked) {
Event* evt = g_handle_table.Get<Event>(handle).get();
if (evt == nullptr) return InvalidHandle(ErrorModule::Kernel);
evt->permanent_locked = permanent_locked;
return RESULT_SUCCESS;
}
/**
* Changes whether an event is locked or not
* @param handle Handle to event to change
* @param locked Boolean locked value to set event
* @return Result of operation, 0 on success, otherwise error code
*/
ResultCode SetEventLocked(const Handle handle, const bool locked) {
Event* evt = g_handle_table.Get<Event>(handle).get();
if (evt == nullptr) return InvalidHandle(ErrorModule::Kernel);
if (!evt->permanent_locked) {
evt->locked = locked;
}
return RESULT_SUCCESS;
}
/**
* Signals an event
* @param handle Handle to event to signal
* @return Result of operation, 0 on success, otherwise error code
*/
ResultCode SignalEvent(const Handle handle) {
Event* evt = g_handle_table.Get<Event>(handle).get();
if (evt == nullptr) return InvalidHandle(ErrorModule::Kernel);
if (evt == nullptr)
return InvalidHandle(ErrorModule::Kernel);
// Resume threads waiting for event to signal
bool event_caught = false;
for (size_t i = 0; i < evt->waiting_threads.size(); ++i) {
Thread* thread = Kernel::g_handle_table.Get<Thread>(evt->waiting_threads[i]).get();
if (thread != nullptr)
thread->ResumeFromWait();
evt->signaled = true;
evt->WakeupAllWaitingThreads();
// If any thread is signalled awake by this event, assume the event was "caught" and reset
// the event. This will result in the next thread waiting on the event to block. Otherwise,
// the event will not be reset, and the next thread to call WaitSynchronization on it will
// not block. Not sure if this is correct behavior, but it seems to work.
event_caught = true;
}
evt->waiting_threads.clear();
if (!evt->permanent_locked) {
evt->locked = event_caught;
}
return RESULT_SUCCESS;
}
/**
* Clears an event
* @param handle Handle to event to clear
* @return Result of operation, 0 on success, otherwise error code
*/
ResultCode ClearEvent(Handle handle) {
Event* evt = g_handle_table.Get<Event>(handle).get();
if (evt == nullptr) return InvalidHandle(ErrorModule::Kernel);
if (evt == nullptr)
return InvalidHandle(ErrorModule::Kernel);
evt->signaled = false;
if (!evt->permanent_locked) {
evt->locked = true;
}
return RESULT_SUCCESS;
}
@ -134,20 +75,13 @@ Event* CreateEvent(Handle& handle, const ResetType reset_type, const std::string
// TOOD(yuriks): Fix error reporting
handle = Kernel::g_handle_table.Create(evt).ValueOr(INVALID_HANDLE);
evt->locked = true;
evt->permanent_locked = false;
evt->signaled = false;
evt->reset_type = evt->intitial_reset_type = reset_type;
evt->name = name;
return evt;
}
/**
* Creates an event
* @param reset_type ResetType describing how to create event
* @param name Optional name of event
* @return Handle to newly created Event object
*/
Handle CreateEvent(const ResetType reset_type, const std::string& name) {
Handle handle;
Event* evt = CreateEvent(handle, reset_type, name);

16
src/core/hle/kernel/event.h
View File

@ -11,29 +11,17 @@
namespace Kernel {
/**
* Changes whether an event is locked or not
* @param handle Handle to event to change
* @param locked Boolean locked value to set event
*/
ResultCode SetEventLocked(const Handle handle, const bool locked);
/**
* Hackish function to set an events permanent lock state, used to pass through synch blocks
* @param handle Handle to event to change
* @param permanent_locked Boolean permanent locked value to set event
*/
ResultCode SetPermanentLock(Handle handle, const bool permanent_locked);
/**
* Signals an event
* @param handle Handle to event to signal
* @return Result of operation, 0 on success, otherwise error code
*/
ResultCode SignalEvent(const Handle handle);
/**
* Clears an event
* @param handle Handle to event to clear
* @return Result of operation, 0 on success, otherwise error code
*/
ResultCode ClearEvent(Handle handle);

35
src/core/hle/kernel/kernel.cpp
View File

@ -18,6 +18,41 @@ SharedPtr<Thread> g_main_thread = nullptr;
HandleTable g_handle_table;
u64 g_program_id = 0;
void WaitObject::AddWaitingThread(Thread* thread) {
auto itr = std::find(waiting_threads.begin(), waiting_threads.end(), thread);
if (itr == waiting_threads.end())
waiting_threads.push_back(thread);
}
void WaitObject::RemoveWaitingThread(Thread* thread) {
auto itr = std::find(waiting_threads.begin(), waiting_threads.end(), thread);
if (itr != waiting_threads.end())
waiting_threads.erase(itr);
}
Thread* WaitObject::WakeupNextThread() {
if (waiting_threads.empty())
return nullptr;
auto next_thread = waiting_threads.front();
waiting_threads.erase(waiting_threads.begin());
next_thread->ReleaseWaitObject(this);
return next_thread;
}
void WaitObject::WakeupAllWaitingThreads() {
auto waiting_threads_copy = waiting_threads;
// We use a copy because ReleaseWaitObject will remove the thread from this object's
// waiting_threads list
for (auto thread : waiting_threads_copy)
thread->ReleaseWaitObject(this);
_assert_msg_(Kernel, waiting_threads.empty(), "failed to awaken all waiting threads!");
}
HandleTable::HandleTable() {
next_generation = 1;
Clear();

87
src/core/hle/kernel/kernel.h
View File

@ -8,6 +8,8 @@
#include <array>
#include <string>
#include <vector>
#include "common/common.h"
#include "core/hle/result.h"
@ -58,17 +60,35 @@ class Object : NonCopyable {
public:
virtual ~Object() {}
Handle GetHandle() const { return handle; }
virtual std::string GetTypeName() const { return "[BAD KERNEL OBJECT TYPE]"; }
virtual std::string GetName() const { return "[UNKNOWN KERNEL OBJECT]"; }
virtual Kernel::HandleType GetHandleType() const = 0;
/**
* Wait for kernel object to synchronize.
* @return True if the current thread should wait as a result of the wait
* Check if a thread can wait on the object
* @return True if a thread can wait on the object, otherwise false
*/
virtual ResultVal<bool> WaitSynchronization() {
LOG_ERROR(Kernel, "(UNIMPLEMENTED)");
return UnimplementedFunction(ErrorModule::Kernel);
bool IsWaitable() const {
switch (GetHandleType()) {
case HandleType::Session:
case HandleType::Event:
case HandleType::Mutex:
case HandleType::Thread:
case HandleType::Semaphore:
case HandleType::Timer:
return true;
case HandleType::Unknown:
case HandleType::Port:
case HandleType::SharedMemory:
case HandleType::Redirection:
case HandleType::Process:
case HandleType::AddressArbiter:
return false;
}
return false;
}
private:
@ -92,6 +112,44 @@ inline void intrusive_ptr_release(Object* object) {
template <typename T>
using SharedPtr = boost::intrusive_ptr<T>;
/// Class that represents a Kernel object that a thread can be waiting on
class WaitObject : public Object {
public:
/**
* Check if the current thread should wait until the object is available
* @return True if the current thread should wait due to this object being unavailable
*/
virtual bool ShouldWait() = 0;
/// Acquire/lock the object if it is available
virtual void Acquire() = 0;
/**
* Add a thread to wait on this object
* @param thread Pointer to thread to add
*/
void AddWaitingThread(Thread* thread);
/**
* Removes a thread from waiting on this object (e.g. if it was resumed already)
* @param thread Pointer to thread to remove
*/
void RemoveWaitingThread(Thread* thead);
/**
* Wake up the next thread waiting on this object
* @return Pointer to the thread that was resumed, nullptr if no threads are waiting
*/
Thread* WakeupNextThread();
/// Wake up all threads waiting on this object
void WakeupAllWaitingThreads();
private:
std::vector<Thread*> waiting_threads; ///< Threads waiting for this object to become available
};
/**
* This class allows the creation of Handles, which are references to objects that can be tested
* for validity and looked up. Here they are used to pass references to kernel objects to/from the
@ -146,14 +204,14 @@ public:
/**
* Looks up a handle.
* @returns Pointer to the looked-up object, or `nullptr` if the handle is not valid.
* @return Pointer to the looked-up object, or `nullptr` if the handle is not valid.
*/
SharedPtr<Object> GetGeneric(Handle handle) const;
/**
* Looks up a handle while verifying its type.
* @returns Pointer to the looked-up object, or `nullptr` if the handle is not valid or its
* type differs from the handle type `T::HANDLE_TYPE`.
* @return Pointer to the looked-up object, or `nullptr` if the handle is not valid or its
* type differs from the handle type `T::HANDLE_TYPE`.
*/
template <class T>
SharedPtr<T> Get(Handle handle) const {
@ -164,6 +222,19 @@ public:
return nullptr;
}
/**
* Looks up a handle while verifying that it is an object that a thread can wait on
* @return Pointer to the looked-up object, or `nullptr` if the handle is not valid or it is
* not a waitable object.
*/
SharedPtr<WaitObject> GetWaitObject(Handle handle) const {
SharedPtr<Object> object = GetGeneric(handle);
if (object != nullptr && object->IsWaitable()) {
return boost::static_pointer_cast<WaitObject>(std::move(object));
}
return nullptr;
}
/// Closes all handles held in this table.
void Clear();

116
src/core/hle/kernel/mutex.cpp
View File

@ -13,7 +13,7 @@
namespace Kernel {
class Mutex : public Object {
class Mutex : public WaitObject {
public:
std::string GetTypeName() const override { return "Mutex"; }
std::string GetName() const override { return name; }
@ -23,39 +23,26 @@ public:
bool initial_locked; ///< Initial lock state when mutex was created
bool locked; ///< Current locked state
Handle lock_thread; ///< Handle to thread that currently has mutex
std::vector<Handle> waiting_threads; ///< Threads that are waiting for the mutex
std::string name; ///< Name of mutex (optional)
SharedPtr<Thread> holding_thread; ///< Thread that has acquired the mutex
ResultVal<bool> WaitSynchronization() override;
bool ShouldWait() override;
void Acquire() override;
};
////////////////////////////////////////////////////////////////////////////////////////////////////
typedef std::multimap<Handle, Handle> MutexMap;
typedef std::multimap<SharedPtr<Thread>, SharedPtr<Mutex>> MutexMap;
static MutexMap g_mutex_held_locks;
/**
* Acquires the specified mutex for the specified thread
* @param mutex Mutex that is to be acquired
* @param thread Thread that will acquired
* @param thread Thread that will acquire the mutex
*/
void MutexAcquireLock(Mutex* mutex, Handle thread = GetCurrentThread()->GetHandle()) {
g_mutex_held_locks.insert(std::make_pair(thread, mutex->GetHandle()));
mutex->lock_thread = thread;
}
bool ReleaseMutexForThread(Mutex* mutex, Handle thread_handle) {
MutexAcquireLock(mutex, thread_handle);
Thread* thread = Kernel::g_handle_table.Get<Thread>(thread_handle).get();
if (thread == nullptr) {
LOG_ERROR(Kernel, "Called with invalid handle: %08X", thread_handle);
return false;
}
thread->ResumeFromWait();
return true;
void MutexAcquireLock(Mutex* mutex, Thread* thread) {
g_mutex_held_locks.insert(std::make_pair(thread, mutex));
mutex->holding_thread = thread;
}
/**
@ -64,56 +51,41 @@ bool ReleaseMutexForThread(Mutex* mutex, Handle thread_handle) {
*/
void ResumeWaitingThread(Mutex* mutex) {
// Find the next waiting thread for the mutex...
if (mutex->waiting_threads.empty()) {
auto next_thread = mutex->WakeupNextThread();
if (next_thread != nullptr) {
MutexAcquireLock(mutex, next_thread);
} else {
// Reset mutex lock thread handle, nothing is waiting
mutex->locked = false;
mutex->lock_thread = -1;
}
else {
// Resume the next waiting thread and re-lock the mutex
std::vector<Handle>::iterator iter = mutex->waiting_threads.begin();
ReleaseMutexForThread(mutex, *iter);
mutex->waiting_threads.erase(iter);
mutex->holding_thread = nullptr;
}
}
void MutexEraseLock(Mutex* mutex) {
Handle handle = mutex->GetHandle();
auto locked = g_mutex_held_locks.equal_range(mutex->lock_thread);
for (MutexMap::iterator iter = locked.first; iter != locked.second; ++iter) {
if (iter->second == handle) {
g_mutex_held_locks.erase(iter);
break;
}
}
mutex->lock_thread = -1;
}
void ReleaseThreadMutexes(Handle thread) {
void ReleaseThreadMutexes(Thread* thread) {
auto locked = g_mutex_held_locks.equal_range(thread);
// Release every mutex that the thread holds, and resume execution on the waiting threads
for (MutexMap::iterator iter = locked.first; iter != locked.second; ++iter) {
Mutex* mutex = g_handle_table.Get<Mutex>(iter->second).get();
ResumeWaitingThread(mutex);
for (auto iter = locked.first; iter != locked.second; ++iter) {
ResumeWaitingThread(iter->second.get());
}
// Erase all the locks that this thread holds
g_mutex_held_locks.erase(thread);
}
bool LockMutex(Mutex* mutex) {
// Mutex alread locked?
if (mutex->locked) {
return false;
}
MutexAcquireLock(mutex);
return true;
}
bool ReleaseMutex(Mutex* mutex) {
MutexEraseLock(mutex);
ResumeWaitingThread(mutex);
if (mutex->locked) {
auto locked = g_mutex_held_locks.equal_range(mutex->holding_thread);
for (MutexMap::iterator iter = locked.first; iter != locked.second; ++iter) {
if (iter->second == mutex) {
g_mutex_held_locks.erase(iter);
break;
}
}
ResumeWaitingThread(mutex);
}
return true;
}
@ -148,15 +120,12 @@ Mutex* CreateMutex(Handle& handle, bool initial_locked, const std::string& name)
mutex->locked = mutex->initial_locked = initial_locked;
mutex->name = name;
mutex->holding_thread = nullptr;
// Acquire mutex with current thread if initialized as locked...
if (mutex->locked) {
MutexAcquireLock(mutex);
if (mutex->locked)
MutexAcquireLock(mutex, GetCurrentThread());
// Otherwise, reset lock thread handle
} else {
mutex->lock_thread = -1;
}
return mutex;
}
@ -172,17 +141,14 @@ Handle CreateMutex(bool initial_locked, const std::string& name) {
return handle;
}
ResultVal<bool> Mutex::WaitSynchronization() {
bool wait = locked;
if (locked) {
waiting_threads.push_back(GetCurrentThread()->GetHandle());
Kernel::WaitCurrentThread(WAITTYPE_MUTEX, this);
} else {
// Lock the mutex when the first thread accesses it
locked = true;
MutexAcquireLock(this);
}
return MakeResult<bool>(wait);
bool Mutex::ShouldWait() {
return locked && holding_thread != GetCurrentThread();
}
void Mutex::Acquire() {
_assert_msg_(Kernel, !ShouldWait(), "object unavailable!");
locked = true;
MutexAcquireLock(this, GetCurrentThread());
}
} // namespace

2
src/core/hle/kernel/mutex.h
View File

@ -28,6 +28,6 @@ Handle CreateMutex(bool initial_locked, const std::string& name="Unknown");
* Releases all the mutexes held by the specified thread
* @param thread Thread that is holding the mutexes
*/
void ReleaseThreadMutexes(Handle thread);
void ReleaseThreadMutexes(Thread* thread);
} // namespace

33
src/core/hle/kernel/semaphore.cpp
View File

@ -12,7 +12,7 @@
namespace Kernel {
class Semaphore : public Object {
class Semaphore : public WaitObject {
public:
std::string GetTypeName() const override { return "Semaphore"; }
std::string GetName() const override { return name; }
@ -22,28 +22,15 @@ public:
s32 max_count; ///< Maximum number of simultaneous holders the semaphore can have
s32 available_count; ///< Number of free slots left in the semaphore
std::queue<Handle> waiting_threads; ///< Threads that are waiting for the semaphore
std::string name; ///< Name of semaphore (optional)
/**
* Tests whether a semaphore still has free slots
* @return Whether the semaphore is available
*/
bool IsAvailable() const {
return available_count > 0;
bool ShouldWait() override {
return available_count <= 0;
}
ResultVal<bool> WaitSynchronization() override {
bool wait = !IsAvailable();
if (wait) {
Kernel::WaitCurrentThread(WAITTYPE_SEMA, this);
waiting_threads.push(GetCurrentThread()->GetHandle());
} else {
--available_count;
}
return MakeResult<bool>(wait);
void Acquire() override {
_assert_msg_(Kernel, !ShouldWait(), "object unavailable!");
--available_count;
}
};
@ -83,12 +70,8 @@ ResultCode ReleaseSemaphore(s32* count, Handle handle, s32 release_count) {
// Notify some of the threads that the semaphore has been released
// stop once the semaphore is full again or there are no more waiting threads
while (!semaphore->waiting_threads.empty() && semaphore->IsAvailable()) {
Thread* thread = Kernel::g_handle_table.Get<Thread>(semaphore->waiting_threads.front()).get();
if (thread != nullptr)
thread->ResumeFromWait();
semaphore->waiting_threads.pop();
--semaphore->available_count;
while (!semaphore->ShouldWait() && semaphore->WakeupNextThread() != nullptr) {
semaphore->Acquire();
}
return RESULT_SUCCESS;

13
src/core/hle/kernel/session.h
View File

@ -41,7 +41,7 @@ inline static u32* GetCommandBuffer(const int offset=0) {
* CTR-OS so that IPC calls can be optionally handled by the real implementations of processes, as
* opposed to HLE simulations.
*/
class Session : public Object {
class Session : public WaitObject {
public:
std::string GetTypeName() const override { return "Session"; }
@ -53,6 +53,17 @@ public:
* aren't supported yet.
*/
virtual ResultVal<bool> SyncRequest() = 0;
// TODO(bunnei): These functions exist to satisfy a hardware test with a Session object
// passed into WaitSynchronization. Figure out the meaning of them.
bool ShouldWait() override {
return true;
}
void Acquire() override {
_assert_msg_(Kernel, !ShouldWait(), "object unavailable!");
}
};
}

174
src/core/hle/kernel/thread.cpp
View File

@ -22,17 +22,12 @@
namespace Kernel {
ResultVal<bool> Thread::WaitSynchronization() {
const bool wait = status != THREADSTATUS_DORMANT;
if (wait) {
Thread* thread = GetCurrentThread();
if (std::find(waiting_threads.begin(), waiting_threads.end(), thread) == waiting_threads.end()) {
waiting_threads.push_back(thread);
}
WaitCurrentThread(WAITTYPE_THREADEND, this);
}
bool Thread::ShouldWait() {
return status != THREADSTATUS_DORMANT;
}
return MakeResult<bool>(wait);
void Thread::Acquire() {
_assert_msg_(Kernel, !ShouldWait(), "object unavailable!");
}
// Lists all thread ids that aren't deleted/etc.
@ -67,8 +62,8 @@ static void ResetThread(Thread* t, u32 arg, s32 lowest_priority) {
if (t->current_priority < lowest_priority) {
t->current_priority = t->initial_priority;
}
t->wait_type = WAITTYPE_NONE;
t->wait_object = nullptr;
t->wait_objects.clear();
t->wait_address = 0;
}
@ -88,37 +83,32 @@ static void ChangeReadyState(Thread* t, bool ready) {
}
}
/// Check if a thread is blocking on a specified wait type
static bool CheckWaitType(const Thread* thread, WaitType type) {
return (type == thread->wait_type) && (thread->IsWaiting());
/// Check if a thread is waiting on a the specified wait object
static bool CheckWait_WaitObject(const Thread* thread, WaitObject* wait_object) {
auto itr = std::find(thread->wait_objects.begin(), thread->wait_objects.end(), wait_object);
if (itr != thread->wait_objects.end())
return thread->IsWaiting();
return false;
}
/// Check if a thread is blocking on a specified wait type with a specified handle
static bool CheckWaitType(const Thread* thread, WaitType type, Object* wait_object) {
return CheckWaitType(thread, type) && wait_object == thread->wait_object;
}
/// Check if a thread is blocking on a specified wait type with a specified handle and address
static bool CheckWaitType(const Thread* thread, WaitType type, Object* wait_object, VAddr wait_address) {
return CheckWaitType(thread, type, wait_object) && (wait_address == thread->wait_address);
/// Check if the specified thread is waiting on the specified address to be arbitrated
static bool CheckWait_AddressArbiter(const Thread* thread, VAddr wait_address) {
return thread->IsWaiting() && thread->wait_objects.empty() && wait_address == thread->wait_address;
}
/// Stops the current thread
void Thread::Stop(const char* reason) {
// Release all the mutexes that this thread holds
ReleaseThreadMutexes(GetHandle());
ReleaseThreadMutexes(this);
ChangeReadyState(this, false);
status = THREADSTATUS_DORMANT;
for (auto& waiting_thread : waiting_threads) {
if (CheckWaitType(waiting_thread.get(), WAITTYPE_THREADEND, this))
waiting_thread->ResumeFromWait();
}
waiting_threads.clear();
WakeupAllWaitingThreads();
// Stopped threads are never waiting.
wait_type = WAITTYPE_NONE;
wait_object = nullptr;
wait_objects.clear();
wait_address = 0;
}
@ -129,26 +119,20 @@ static void ChangeThreadState(Thread* t, ThreadStatus new_status) {
}
ChangeReadyState(t, (new_status & THREADSTATUS_READY) != 0);
t->status = new_status;
if (new_status == THREADSTATUS_WAIT) {
if (t->wait_type == WAITTYPE_NONE) {
LOG_ERROR(Kernel, "Waittype none not allowed");
}
}
}
/// Arbitrate the highest priority thread that is waiting
Thread* ArbitrateHighestPriorityThread(Object* arbiter, u32 address) {
Thread* ArbitrateHighestPriorityThread(u32 address) {
Thread* highest_priority_thread = nullptr;
s32 priority = THREADPRIO_LOWEST;
// Iterate through threads, find highest priority thread that is waiting to be arbitrated...
for (auto& thread : thread_list) {
if (!CheckWaitType(thread.get(), WAITTYPE_ARB, arbiter, address))
if (!CheckWait_AddressArbiter(thread.get(), address))
continue;
if (thread == nullptr)
continue; // TODO(yuriks): Thread handle will hang around forever. Should clean up.
continue;
if(thread->current_priority <= priority) {
highest_priority_thread = thread.get();
@ -165,11 +149,11 @@ Thread* ArbitrateHighestPriorityThread(Object* arbiter, u32 address) {
}
/// Arbitrate all threads currently waiting
void ArbitrateAllThreads(Object* arbiter, u32 address) {
void ArbitrateAllThreads(u32 address) {
// Iterate through threads, find highest priority thread that is waiting to be arbitrated...
for (auto& thread : thread_list) {
if (CheckWaitType(thread.get(), WAITTYPE_ARB, arbiter, address))
if (CheckWait_AddressArbiter(thread.get(), address))
thread->ResumeFromWait();
}
}
@ -177,9 +161,6 @@ void ArbitrateAllThreads(Object* arbiter, u32 address) {
/// Calls a thread by marking it as "ready" (note: will not actually execute until current thread yields)
static void CallThread(Thread* t) {
// Stop waiting
if (t->wait_type != WAITTYPE_NONE) {
t->wait_type = WAITTYPE_NONE;
}
ChangeThreadState(t, THREADSTATUS_READY);
}
@ -200,7 +181,6 @@ static void SwitchContext(Thread* t) {
current_thread = t;
ChangeReadyState(t, false);
t->status = (t->status | THREADSTATUS_RUNNING) & ~THREADSTATUS_READY;
t->wait_type = WAITTYPE_NONE;
Core::g_app_core->LoadContext(t->context);
} else {
current_thread = nullptr;
@ -223,16 +203,27 @@ static Thread* NextThread() {
return next;
}
void WaitCurrentThread(WaitType wait_type, Object* wait_object) {
void WaitCurrentThread_Sleep() {
Thread* thread = GetCurrentThread();
thread->wait_type = wait_type;
thread->wait_object = wait_object;
ChangeThreadState(thread, ThreadStatus(THREADSTATUS_WAIT | (thread->status & THREADSTATUS_SUSPEND)));
}
void WaitCurrentThread(WaitType wait_type, Object* wait_object, VAddr wait_address) {
WaitCurrentThread(wait_type, wait_object);
GetCurrentThread()->wait_address = wait_address;
void WaitCurrentThread_WaitSynchronization(SharedPtr<WaitObject> wait_object, bool wait_set_output, bool wait_all) {
Thread* thread = GetCurrentThread();
thread->wait_set_output = wait_set_output;
thread->wait_all = wait_all;
// It's possible to call WaitSynchronizationN without any objects passed in...
if (wait_object != nullptr)
thread->wait_objects.push_back(wait_object);
ChangeThreadState(thread, ThreadStatus(THREADSTATUS_WAIT | (thread->status & THREADSTATUS_SUSPEND)));
}
void WaitCurrentThread_ArbitrateAddress(VAddr wait_address) {
Thread* thread = GetCurrentThread();
thread->wait_address = wait_address;
ChangeThreadState(thread, ThreadStatus(THREADSTATUS_WAIT | (thread->status & THREADSTATUS_SUSPEND)));
}
/// Event type for the thread wake up event
@ -247,6 +238,12 @@ static void ThreadWakeupCallback(u64 parameter, int cycles_late) {
return;
}
thread->SetWaitSynchronizationResult(ResultCode(ErrorDescription::Timeout, ErrorModule::OS,
ErrorSummary::StatusChanged, ErrorLevel::Info));
if (thread->wait_set_output)
thread->SetWaitSynchronizationOutput(-1);
thread->ResumeFromWait();
}
@ -261,14 +258,63 @@ void WakeThreadAfterDelay(Thread* thread, s64 nanoseconds) {
CoreTiming::ScheduleEvent(usToCycles(microseconds), ThreadWakeupEventType, thread->GetHandle());
}
/// Resumes a thread from waiting by marking it as "ready"
void Thread::ReleaseWaitObject(WaitObject* wait_object) {
if (wait_objects.empty()) {
LOG_CRITICAL(Kernel, "thread is not waiting on any objects!");
return;
}
// Remove this thread from the waiting object's thread list
wait_object->RemoveWaitingThread(this);
unsigned index = 0;
bool wait_all_failed = false; // Will be set to true if any object is unavailable
// Iterate through all waiting objects to check availability...
for (auto itr = wait_objects.begin(); itr != wait_objects.end(); ++itr) {
if ((*itr)->ShouldWait())
wait_all_failed = true;
// The output should be the last index of wait_object
if (*itr == wait_object)
index = itr - wait_objects.begin();
}
// If we are waiting on all objects...
if (wait_all) {
// Resume the thread only if all are available...
if (!wait_all_failed) {
SetWaitSynchronizationResult(RESULT_SUCCESS);
SetWaitSynchronizationOutput(-1);
ResumeFromWait();
}
} else {
// Otherwise, resume
SetWaitSynchronizationResult(RESULT_SUCCESS);
if (wait_set_output)
SetWaitSynchronizationOutput(index);
ResumeFromWait();
}
}
void Thread::ResumeFromWait() {
// Cancel any outstanding wakeup events
CoreTiming::UnscheduleEvent(ThreadWakeupEventType, GetHandle());
status &= ~THREADSTATUS_WAIT;
wait_object = nullptr;
wait_type = WAITTYPE_NONE;
// Remove this thread from all other WaitObjects
for (auto wait_object : wait_objects)
wait_object->RemoveWaitingThread(this);
wait_objects.clear();
wait_set_output = false;
wait_all = false;
wait_address = 0;
if (!(status & (THREADSTATUS_WAITSUSPEND | THREADSTATUS_DORMANT | THREADSTATUS_DEAD))) {
ChangeReadyState(this, true);
}
@ -334,8 +380,9 @@ ResultVal<SharedPtr<Thread>> Thread::Create(std::string name, VAddr entry_point,
thread->stack_size = stack_size;
thread->initial_priority = thread->current_priority = priority;
thread->processor_id = processor_id;
thread->wait_type = WAITTYPE_NONE;
thread->wait_object = nullptr;
thread->wait_set_output = false;
thread->wait_all = false;
thread->wait_objects.clear();
thread->wait_address = 0;
thread->name = std::move(name);
@ -419,13 +466,20 @@ void Reschedule() {
LOG_TRACE(Kernel, "cannot context switch from 0x%08X, no higher priority thread!", prev->GetHandle());
for (auto& thread : thread_list) {
LOG_TRACE(Kernel, "\thandle=0x%08X prio=0x%02X, status=0x%08X wait_type=0x%08X wait_handle=0x%08X",
thread->GetHandle(), thread->current_priority, thread->status, thread->wait_type,
(thread->wait_object ? thread->wait_object->GetHandle() : INVALID_HANDLE));
LOG_TRACE(Kernel, "\thandle=0x%08X prio=0x%02X, status=0x%08X", thread->GetHandle(),
thread->current_priority, thread->status);
}
}
}
void Thread::SetWaitSynchronizationResult(ResultCode result) {
context.cpu_registers[0] = result.raw;
}
void Thread::SetWaitSynchronizationOutput(s32 output) {
context.cpu_registers[1] = output;
}
////////////////////////////////////////////////////////////////////////////////////////////////////
void ThreadingInit() {

82
src/core/hle/kernel/thread.h
View File

@ -38,21 +38,9 @@ enum ThreadStatus {
THREADSTATUS_WAITSUSPEND = THREADSTATUS_WAIT | THREADSTATUS_SUSPEND
};
enum WaitType {
WAITTYPE_NONE,
WAITTYPE_SLEEP,
WAITTYPE_SEMA,
WAITTYPE_EVENT,
WAITTYPE_THREADEND,
WAITTYPE_MUTEX,
WAITTYPE_SYNCH,
WAITTYPE_ARB,
WAITTYPE_TIMER,
};
namespace Kernel {
class Thread : public Kernel::Object {
class Thread : public WaitObject {
public:
static ResultVal<SharedPtr<Thread>> Create(std::string name, VAddr entry_point, s32 priority,
u32 arg, s32 processor_id, VAddr stack_top, u32 stack_size);
@ -70,7 +58,8 @@ public:
inline bool IsSuspended() const { return (status & THREADSTATUS_SUSPEND) != 0; }
inline bool IsIdle() const { return idle; }
ResultVal<bool> WaitSynchronization() override;
bool ShouldWait() override;
void Acquire() override;
s32 GetPriority() const { return current_priority; }
void SetPriority(s32 priority);
@ -78,9 +67,28 @@ public:
u32 GetThreadId() const { return thread_id; }
void Stop(const char* reason);
/// Resumes a thread from waiting by marking it as "ready".
/**
* Release an acquired wait object
* @param wait_object WaitObject to release
*/
void ReleaseWaitObject(WaitObject* wait_object);
/// Resumes a thread from waiting by marking it as "ready"
void ResumeFromWait();
/**
* Sets the result after the thread awakens (from either WaitSynchronization SVC)
* @param result Value to set to the returned result
*/
void SetWaitSynchronizationResult(ResultCode result);
/**
* Sets the output parameter value after the thread awakens (from WaitSynchronizationN SVC only)
* @param output Value to set to the output parameter
*/
void SetWaitSynchronizationOutput(s32 output);
Core::ThreadContext context;
u32 thread_id;
@ -95,11 +103,11 @@ public:
s32 processor_id;
WaitType wait_type;
Object* wait_object;
VAddr wait_address;
std::vector<SharedPtr<WaitObject>> wait_objects; ///< Objects that the thread is waiting on
std::vector<SharedPtr<Thread>> waiting_threads;
VAddr wait_address; ///< If waiting on an AddressArbiter, this is the arbitration address
bool wait_all; ///< True if the thread is waiting on all objects before resuming
bool wait_set_output; ///< True if the output parameter should be set on thread wakeup
std::string name;
@ -107,6 +115,7 @@ public:
bool idle = false;
private:
Thread() = default;
};
@ -117,38 +126,38 @@ SharedPtr<Thread> SetupMainThread(s32 priority, u32 stack_size);
void Reschedule();
/// Arbitrate the highest priority thread that is waiting
Thread* ArbitrateHighestPriorityThread(Object* arbiter, u32 address);
Thread* ArbitrateHighestPriorityThread(u32 address);
/// Arbitrate all threads currently waiting...
void ArbitrateAllThreads(Object* arbiter, u32 address);
void ArbitrateAllThreads(u32 address);
/// Gets the current thread
Thread* GetCurrentThread();
/// Waits the current thread on a sleep
void WaitCurrentThread_Sleep();
/**
* Puts the current thread in the wait state for the given type
* @param wait_type Type of wait
* @param wait_object Kernel object that we are waiting on, defaults to current thread
* Waits the current thread from a WaitSynchronization call
* @param wait_object Kernel object that we are waiting on
* @param wait_set_output If true, set the output parameter on thread wakeup (for WaitSynchronizationN only)
* @param wait_all If true, wait on all objects before resuming (for WaitSynchronizationN only)
*/
void WaitCurrentThread(WaitType wait_type, Object* wait_object = GetCurrentThread());
void WaitCurrentThread_WaitSynchronization(SharedPtr<WaitObject> wait_object, bool wait_set_output, bool wait_all);
/**
* Waits the current thread from an ArbitrateAddress call
* @param wait_address Arbitration address used to resume from wait
*/
void WaitCurrentThread_ArbitrateAddress(VAddr wait_address);
/**
* Schedules an event to wake up the specified thread after the specified delay.
* @param thread The thread to wake after the delay.
* @param handle The thread handle.
* @param nanoseconds The time this thread will be allowed to sleep for.
*/
void WakeThreadAfterDelay(Thread* thread, s64 nanoseconds);
/**
* Puts the current thread in the wait state for the given type
* @param wait_type Type of wait
* @param wait_object Kernel object that we are waiting on
* @param wait_address Arbitration address used to resume from wait
*/
void WaitCurrentThread(WaitType wait_type, Object* wait_object, VAddr wait_address);
/**
* Sets up the idle thread, this is a thread that is intended to never execute instructions,
* only to advance the timing. It is scheduled when there are no other ready threads in the thread queue
@ -156,6 +165,7 @@ void WaitCurrentThread(WaitType wait_type, Object* wait_object, VAddr wait_addre
* @returns The handle of the idle thread
*/
Handle SetupIdleThread();
/// Initialize threading
void ThreadingInit();

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

@ -13,7 +13,7 @@
namespace Kernel {
class Timer : public Object {
class Timer : public WaitObject {
public:
std::string GetTypeName() const override { return "Timer"; }
std::string GetName() const override { return name; }
@ -24,19 +24,17 @@ public:
ResetType reset_type; ///< The ResetType of this timer
bool signaled; ///< Whether the timer has been signaled or not
std::set<Handle> waiting_threads; ///< Threads that are waiting for the timer
std::string name; ///< Name of timer (optional)
u64 initial_delay; ///< The delay until the timer fires for the first time
u64 interval_delay; ///< The delay until the timer fires after the first time
ResultVal<bool> WaitSynchronization() override {
bool wait = !signaled;
if (wait) {
waiting_threads.insert(GetCurrentThread()->GetHandle());
Kernel::WaitCurrentThread(WAITTYPE_TIMER, this);
}
return MakeResult<bool>(wait);
bool ShouldWait() override {
return !signaled;
}
void Acquire() override {
_assert_msg_(Kernel, !ShouldWait(), "object unavailable!");
}
};
@ -92,12 +90,7 @@ static void TimerCallback(u64 timer_handle, int cycles_late) {
timer->signaled = true;
// Resume all waiting threads
for (Handle thread_handle : timer->waiting_threads) {
if (SharedPtr<Thread> thread = Kernel::g_handle_table.Get<Thread>(thread_handle))
thread->ResumeFromWait();
}
timer->waiting_threads.clear();
timer->WakeupAllWaitingThreads();
if (timer->reset_type == RESETTYPE_ONESHOT)
timer->signaled = false;

4
src/core/hle/service/apt_u.cpp
View File

@ -50,8 +50,8 @@ void Initialize(Service::Interface* self) {
cmd_buff[3] = notification_event_handle;
cmd_buff[4] = pause_event_handle;
Kernel::SetEventLocked(notification_event_handle, true);
Kernel::SetEventLocked(pause_event_handle, false); // Fire start event
Kernel::ClearEvent(notification_event_handle);
Kernel::SignalEvent(pause_event_handle); // Fire start event
_assert_msg_(KERNEL, (0 != lock_handle), "Cannot initialize without lock");
Kernel::ReleaseMutex(lock_handle);

2
src/core/hle/service/srv.cpp
View File

@ -24,7 +24,7 @@ static void GetProcSemaphore(Service::Interface* self) {
// TODO(bunnei): Change to a semaphore once these have been implemented
g_event_handle = Kernel::CreateEvent(RESETTYPE_ONESHOT, "SRV:Event");
Kernel::SetEventLocked(g_event_handle, false);
Kernel::ClearEvent(g_event_handle);
cmd_buff[1] = 0; // No error
cmd_buff[3] = g_event_handle;

135
src/core/hle/svc.cpp
View File

@ -29,6 +29,9 @@ using Kernel::SharedPtr;
namespace SVC {
/// An invalid result code that is meant to be overwritten when a thread resumes from waiting
const ResultCode RESULT_INVALID(0xDEADC0DE);
enum ControlMemoryOperation {
MEMORY_OPERATION_HEAP = 0x00000003,
MEMORY_OPERATION_GSP_HEAP = 0x00010003,
@ -103,12 +106,7 @@ static Result SendSyncRequest(Handle handle) {
LOG_TRACE(Kernel_SVC, "called handle=0x%08X(%s)", handle, session->GetName().c_str());
ResultVal<bool> wait = session->SyncRequest();
if (wait.Succeeded() && *wait) {
Kernel::WaitCurrentThread(WAITTYPE_SYNCH); // TODO(bunnei): Is this correct?
}
return wait.Code().raw;
return session->SyncRequest().Code().raw;
}
/// Close a handle
@ -120,64 +118,122 @@ static Result CloseHandle(Handle handle) {
/// Wait for a handle to synchronize, timeout after the specified nanoseconds
static Result WaitSynchronization1(Handle handle, s64 nano_seconds) {
SharedPtr<Kernel::Object> object = Kernel::g_handle_table.GetGeneric(handle);
auto object = Kernel::g_handle_table.GetWaitObject(handle);
if (object == nullptr)
return InvalidHandle(ErrorModule::Kernel).raw;
LOG_TRACE(Kernel_SVC, "called handle=0x%08X(%s:%s), nanoseconds=%lld", handle,
object->GetTypeName().c_str(), object->GetName().c_str(), nano_seconds);
ResultVal<bool> wait = object->WaitSynchronization();
// Check for next thread to schedule
if (wait.Succeeded() && *wait) {
if (object->ShouldWait()) {
object->AddWaitingThread(Kernel::GetCurrentThread());
Kernel::WaitCurrentThread_WaitSynchronization(object, false, false);
// Create an event to wake the thread up after the specified nanosecond delay has passed
Kernel::WakeThreadAfterDelay(Kernel::GetCurrentThread(), nano_seconds);
HLE::Reschedule(__func__);
// NOTE: output of this SVC will be set later depending on how the thread resumes
return RESULT_INVALID.raw;
}
return wait.Code().raw;
object->Acquire();
return RESULT_SUCCESS.raw;
}
/// Wait for the given handles to synchronize, timeout after the specified nanoseconds
static Result WaitSynchronizationN(s32* out, Handle* handles, s32 handle_count, bool wait_all,
s64 nano_seconds) {
static Result WaitSynchronizationN(s32* out, Handle* handles, s32 handle_count, bool wait_all, s64 nano_seconds) {
bool wait_thread = !wait_all;
int handle_index = 0;
// TODO(bunnei): Do something with nano_seconds, currently ignoring this
bool unlock_all = true;
bool wait_infinite = (nano_seconds == -1); // Used to wait until a thread has terminated
// Check if 'handles' is invalid
if (handles == nullptr)
return ResultCode(ErrorDescription::InvalidPointer, ErrorModule::Kernel, ErrorSummary::InvalidArgument, ErrorLevel::Permanent).raw;
LOG_TRACE(Kernel_SVC, "called handle_count=%d, wait_all=%s, nanoseconds=%lld",
handle_count, (wait_all ? "true" : "false"), nano_seconds);
// NOTE: on real hardware, there is no nullptr check for 'out' (tested with firmware 4.4). If
// this happens, the running application will crash.
_assert_msg_(Kernel, out != nullptr, "invalid output pointer specified!");
// Iterate through each handle, synchronize kernel object
for (s32 i = 0; i < handle_count; i++) {
SharedPtr<Kernel::Object> object = Kernel::g_handle_table.GetGeneric(handles[i]);
if (object == nullptr)
return InvalidHandle(ErrorModule::Kernel).raw;
// Check if 'handle_count' is invalid
if (handle_count < 0)
return ResultCode(ErrorDescription::OutOfRange, ErrorModule::OS, ErrorSummary::InvalidArgument, ErrorLevel::Usage).raw;
LOG_TRACE(Kernel_SVC, "\thandle[%d] = 0x%08X(%s:%s)", i, handles[i],
object->GetTypeName().c_str(), object->GetName().c_str());
// If 'handle_count' is non-zero, iterate through each handle and wait the current thread if
// necessary
if (handle_count != 0) {
bool selected = false; // True once an object has been selected
for (int i = 0; i < handle_count; ++i) {
auto object = Kernel::g_handle_table.GetWaitObject(handles[i]);
if (object == nullptr)
return InvalidHandle(ErrorModule::Kernel).raw;
// TODO(yuriks): Verify how the real function behaves when an error happens here
ResultVal<bool> wait_result = object->WaitSynchronization();
bool wait = wait_result.Succeeded() && *wait_result;
// Check if the current thread should wait on this object...
if (object->ShouldWait()) {
if (!wait && !wait_all) {
*out = i;
return RESULT_SUCCESS.raw;
} else {
unlock_all = false;
// Check we are waiting on all objects...
if (wait_all)
// Wait the thread
wait_thread = true;
} else {
// Do not wait on this object, check if this object should be selected...
if (!wait_all && !selected) {
// Do not wait the thread
wait_thread = false;
handle_index = i;
selected = true;
}
}
}
} else {
// If no handles were passed in, put the thread to sleep only when 'wait_all' is false
// NOTE: This should deadlock the current thread if no timeout was specified
if (!wait_all) {
wait_thread = true;
Kernel::WaitCurrentThread_WaitSynchronization(nullptr, true, wait_all);
}
}
if (wait_all && unlock_all) {
*out = handle_count;
return RESULT_SUCCESS.raw;
// If thread should wait, then set its state to waiting and then reschedule...
if (wait_thread) {
// Actually wait the current thread on each object if we decided to wait...
for (int i = 0; i < handle_count; ++i) {
auto object = Kernel::g_handle_table.GetWaitObject(handles[i]);
object->AddWaitingThread(Kernel::GetCurrentThread());
Kernel::WaitCurrentThread_WaitSynchronization(object, true, wait_all);
}
// Create an event to wake the thread up after the specified nanosecond delay has passed
Kernel::WakeThreadAfterDelay(Kernel::GetCurrentThread(), nano_seconds);
HLE::Reschedule(__func__);
// NOTE: output of this SVC will be set later depending on how the thread resumes
return RESULT_INVALID.raw;
}
// Check for next thread to schedule
HLE::Reschedule(__func__);
// Acquire objects if we did not wait...
for (int i = 0; i < handle_count; ++i) {
auto object = Kernel::g_handle_table.GetWaitObject(handles[i]);
// Acquire the object if it is not waiting...
if (!object->ShouldWait()) {
object->Acquire();
// If this was the first non-waiting object and 'wait_all' is false, don't acquire
// any other objects
if (!wait_all)
break;
}
}
// TODO(bunnei): If 'wait_all' is true, this is probably wrong. However, real hardware does
// not seem to set it to any meaningful value.
*out = wait_all ? 0 : handle_index;
return RESULT_SUCCESS.raw;
}
@ -351,6 +407,7 @@ static Result DuplicateHandle(Handle* out, Handle handle) {
/// Signals an event
static Result SignalEvent(Handle evt) {
LOG_TRACE(Kernel_SVC, "called event=0x%08X", evt);
HLE::Reschedule(__func__);
return Kernel::SignalEvent(evt).raw;
}
@ -391,7 +448,7 @@ static void SleepThread(s64 nanoseconds) {
LOG_TRACE(Kernel_SVC, "called nanoseconds=%lld", nanoseconds);
// Sleep current thread and check for next thread to schedule
Kernel::WaitCurrentThread(WAITTYPE_SLEEP);
Kernel::WaitCurrentThread_Sleep();
// Create an event to wake the thread up after the specified nanosecond delay has passed
Kernel::WakeThreadAfterDelay(Kernel::GetCurrentThread(), nanoseconds);