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core: Switch to unique_ptr for usage of Common::Fiber. 

- With using unique_ptr instead of shared_ptr, we have more explicit ownership of the context.
- Fixes a memory leak due to circular reference of the shared pointer.
This commit is contained in:
bunnei 2021-02-27 11:56:04 -08:00
parent 09f7c355c6
commit 51fb0a6f96
10 changed files with 58 additions and 59 deletions
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14
src/common/fiber.cpp
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@ -24,7 +24,7 @@ struct Fiber::FiberImpl {
std::function<void(void*)> rewind_point;
void* rewind_parameter{};
void* start_parameter{};
std::shared_ptr<Fiber> previous_fiber;
Fiber* previous_fiber;
bool is_thread_fiber{};
bool released{};
@ -47,7 +47,7 @@ void Fiber::Start(boost::context::detail::transfer_t& transfer) {
ASSERT(impl->previous_fiber != nullptr);
impl->previous_fiber->impl->context = transfer.fctx;
impl->previous_fiber->impl->guard.unlock();
impl->previous_fiber.reset();
impl->previous_fiber = nullptr;
impl->entry_point(impl->start_parameter);
UNREACHABLE();
}
@ -116,20 +116,20 @@ void Fiber::Rewind() {
boost::context::detail::jump_fcontext(impl->rewind_context, this);
}
void Fiber::YieldTo(std::shared_ptr<Fiber> from, std::shared_ptr<Fiber> to) {
void Fiber::YieldTo(Fiber* from, Fiber* to) {
ASSERT_MSG(from != nullptr, "Yielding fiber is null!");
ASSERT_MSG(to != nullptr, "Next fiber is null!");
to->impl->guard.lock();
to->impl->previous_fiber = from;
auto transfer = boost::context::detail::jump_fcontext(to->impl->context, to.get());
auto transfer = boost::context::detail::jump_fcontext(to->impl->context, to);
ASSERT(from->impl->previous_fiber != nullptr);
from->impl->previous_fiber->impl->context = transfer.fctx;
from->impl->previous_fiber->impl->guard.unlock();
from->impl->previous_fiber.reset();
from->impl->previous_fiber = nullptr;
}
std::shared_ptr<Fiber> Fiber::ThreadToFiber() {
std::shared_ptr<Fiber> fiber = std::shared_ptr<Fiber>{new Fiber()};
std::unique_ptr<Fiber> Fiber::ThreadToFiber() {
std::unique_ptr<Fiber> fiber = std::unique_ptr<Fiber>{new Fiber()};
fiber->impl->guard.lock();
fiber->impl->is_thread_fiber = true;
return fiber;

4
src/common/fiber.h
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@ -41,8 +41,8 @@ public:
/// Yields control from Fiber 'from' to Fiber 'to'
/// Fiber 'from' must be the currently running fiber.
static void YieldTo(std::shared_ptr<Fiber> from, std::shared_ptr<Fiber> to);
[[nodiscard]] static std::shared_ptr<Fiber> ThreadToFiber();
static void YieldTo(Fiber* from, Fiber* to);
[[nodiscard]] static std::unique_ptr<Fiber> ThreadToFiber();
void SetRewindPoint(std::function<void(void*)>&& rewind_func, void* rewind_param);

11
src/core/cpu_manager.cpp
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@ -111,7 +111,7 @@ void CpuManager::MultiCoreRunGuestThread() {
auto& kernel = system.Kernel();
kernel.CurrentScheduler()->OnThreadStart();
auto* thread = kernel.CurrentScheduler()->GetCurrentThread();
auto& host_context = thread->GetHostContext();
auto host_context = thread->GetHostContext();
host_context->SetRewindPoint(GuestRewindFunction, this);
MultiCoreRunGuestLoop();
}
@ -148,7 +148,8 @@ void CpuManager::MultiCoreRunSuspendThread() {
auto core = kernel.GetCurrentHostThreadID();
auto& scheduler = *kernel.CurrentScheduler();
Kernel::KThread* current_thread = scheduler.GetCurrentThread();
Common::Fiber::YieldTo(current_thread->GetHostContext(), core_data[core].host_context);
Common::Fiber::YieldTo(current_thread->GetHostContext(),
core_data[core].host_context.get());
ASSERT(scheduler.ContextSwitchPending());
ASSERT(core == kernel.GetCurrentHostThreadID());
scheduler.RescheduleCurrentCore();
@ -201,7 +202,7 @@ void CpuManager::SingleCoreRunGuestThread() {
auto& kernel = system.Kernel();
kernel.CurrentScheduler()->OnThreadStart();
auto* thread = kernel.CurrentScheduler()->GetCurrentThread();
auto& host_context = thread->GetHostContext();
auto host_context = thread->GetHostContext();
host_context->SetRewindPoint(GuestRewindFunction, this);
SingleCoreRunGuestLoop();
}
@ -245,7 +246,7 @@ void CpuManager::SingleCoreRunSuspendThread() {
auto core = kernel.GetCurrentHostThreadID();
auto& scheduler = *kernel.CurrentScheduler();
Kernel::KThread* current_thread = scheduler.GetCurrentThread();
Common::Fiber::YieldTo(current_thread->GetHostContext(), core_data[0].host_context);
Common::Fiber::YieldTo(current_thread->GetHostContext(), core_data[0].host_context.get());
ASSERT(scheduler.ContextSwitchPending());
ASSERT(core == kernel.GetCurrentHostThreadID());
scheduler.RescheduleCurrentCore();
@ -363,7 +364,7 @@ void CpuManager::RunThread(std::size_t core) {
auto current_thread = system.Kernel().CurrentScheduler()->GetCurrentThread();
data.is_running = true;
Common::Fiber::YieldTo(data.host_context, current_thread->GetHostContext());
Common::Fiber::YieldTo(data.host_context.get(), current_thread->GetHostContext());
data.is_running = false;
data.is_paused = true;
data.exit_barrier->Wait();

2
src/core/cpu_manager.h
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@ -83,7 +83,7 @@ private:
void RunThread(std::size_t core);
struct CoreData {
std::shared_ptr<Common::Fiber> host_context;
std::unique_ptr<Common::Fiber> host_context;
std::unique_ptr<Common::Event> enter_barrier;
std::unique_ptr<Common::Event> exit_barrier;
std::atomic<bool> is_running;

18
src/core/hle/kernel/k_scheduler.cpp
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@ -608,7 +608,7 @@ void KScheduler::YieldToAnyThread(KernelCore& kernel) {
}
KScheduler::KScheduler(Core::System& system, s32 core_id) : system(system), core_id(core_id) {
switch_fiber = std::make_shared<Common::Fiber>(OnSwitch, this);
switch_fiber = std::make_unique<Common::Fiber>(OnSwitch, this);
state.needs_scheduling.store(true);
state.interrupt_task_thread_runnable = false;
state.should_count_idle = false;
@ -726,15 +726,15 @@ void KScheduler::ScheduleImpl() {
// Save context for previous thread
Unload(previous_thread);
std::shared_ptr<Common::Fiber>* old_context;
Common::Fiber* old_context;
if (previous_thread != nullptr) {
old_context = &previous_thread->GetHostContext();
old_context = previous_thread->GetHostContext();
} else {
old_context = &idle_thread->GetHostContext();
old_context = idle_thread->GetHostContext();
}
guard.unlock();
Common::Fiber::YieldTo(*old_context, switch_fiber);
Common::Fiber::YieldTo(old_context, switch_fiber.get());
/// When a thread wakes up, the scheduler may have changed to other in another core.
auto& next_scheduler = *system.Kernel().CurrentScheduler();
next_scheduler.SwitchContextStep2();
@ -769,13 +769,13 @@ void KScheduler::SwitchToCurrent() {
break;
}
}
std::shared_ptr<Common::Fiber>* next_context;
Common::Fiber* next_context;
if (next_thread != nullptr) {
next_context = &next_thread->GetHostContext();
next_context = next_thread->GetHostContext();
} else {
next_context = &idle_thread->GetHostContext();
next_context = idle_thread->GetHostContext();
}
Common::Fiber::YieldTo(switch_fiber, *next_context);
Common::Fiber::YieldTo(switch_fiber.get(), next_context);
} while (!is_switch_pending());
}
}

10
src/core/hle/kernel/k_scheduler.h
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@ -68,12 +68,12 @@ public:
void OnThreadStart();
[[nodiscard]] std::shared_ptr<Common::Fiber>& ControlContext() {
return switch_fiber;
[[nodiscard]] Common::Fiber* ControlContext() {
return switch_fiber.get();
}
[[nodiscard]] const std::shared_ptr<Common::Fiber>& ControlContext() const {
return switch_fiber;
[[nodiscard]] const Common::Fiber* ControlContext() const {
return switch_fiber.get();
}
[[nodiscard]] u64 UpdateHighestPriorityThread(KThread* highest_thread);
@ -178,7 +178,7 @@ private:
KThread* idle_thread;
std::shared_ptr<Common::Fiber> switch_fiber{};
std::unique_ptr<Common::Fiber> switch_fiber{};
struct SchedulingState {
std::atomic<bool> needs_scheduling;

6
src/core/hle/kernel/k_thread.cpp
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@ -991,10 +991,6 @@ void KThread::SetState(ThreadState state) {
}
}
std::shared_ptr<Common::Fiber>& KThread::GetHostContext() {
return host_context;
}
ResultVal<std::shared_ptr<KThread>> KThread::Create(Core::System& system, ThreadType type_flags,
std::string name, VAddr entry_point,
u32 priority, u64 arg, s32 processor_id,
@ -1028,7 +1024,7 @@ ResultVal<std::shared_ptr<KThread>> KThread::Create(Core::System& system, Thread
scheduler.AddThread(thread);
thread->host_context =
std::make_shared<Common::Fiber>(std::move(thread_start_func), thread_start_parameter);
std::make_unique<Common::Fiber>(std::move(thread_start_func), thread_start_parameter);
return MakeResult<std::shared_ptr<KThread>>(std::move(thread));
}

10
src/core/hle/kernel/k_thread.h
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@ -293,7 +293,13 @@ public:
return thread_context_64;
}
[[nodiscard]] std::shared_ptr<Common::Fiber>& GetHostContext();
[[nodiscard]] Common::Fiber* GetHostContext() {
return host_context.get();
}
[[nodiscard]] const Common::Fiber* GetHostContext() const {
return host_context.get();
}
[[nodiscard]] ThreadState GetState() const {
return thread_state & ThreadState::Mask;
@ -719,7 +725,7 @@ private:
Common::SpinLock context_guard{};
// For emulation
std::shared_ptr<Common::Fiber> host_context{};
std::unique_ptr<Common::Fiber> host_context{};
// For debugging
std::vector<KSynchronizationObject*> wait_objects_for_debugging;

3
src/core/hle/kernel/svc.cpp
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@ -2626,8 +2626,7 @@ void Call(Core::System& system, u32 immediate) {
kernel.ExitSVCProfile();
if (!thread->IsCallingSvc()) {
auto* host_context = thread->GetHostContext().get();
host_context->Rewind();
thread->GetHostContext()->Rewind();
}
system.EnterDynarmicProfile();

39
src/tests/common/fibers.cpp
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@ -67,16 +67,15 @@ void TestControl1::DoWork() {
value++;
}
results[id] = value;
Fiber::YieldTo(work_fibers[id], thread_fibers[id]);
Fiber::YieldTo(work_fibers[id].get(), thread_fibers[id].get());
}
void TestControl1::ExecuteThread(u32 id) {
thread_ids.Register(id);
auto thread_fiber = Fiber::ThreadToFiber();
thread_fibers[id] = thread_fiber;
thread_fibers[id] = Fiber::ThreadToFiber();
work_fibers[id] = std::make_shared<Fiber>(std::function<void(void*)>{WorkControl1}, this);
items[id] = rand() % 256;
Fiber::YieldTo(thread_fibers[id], work_fibers[id]);
Fiber::YieldTo(thread_fibers[id].get(), work_fibers[id].get());
thread_fibers[id]->Exit();
}
@ -117,11 +116,11 @@ public:
for (u32 i = 0; i < 12000; i++) {
value1 += i;
}
Fiber::YieldTo(fiber1, fiber3);
Fiber::YieldTo(fiber1.get(), fiber3.get());
const u32 id = thread_ids.Get();
assert1 = id == 1;
value2 += 5000;
Fiber::YieldTo(fiber1, thread_fibers[id]);
Fiber::YieldTo(fiber1.get(), thread_fibers[id].get());
}
void DoWork2() {
@ -129,7 +128,7 @@ public:
;
value2 = 2000;
trap = false;
Fiber::YieldTo(fiber2, fiber1);
Fiber::YieldTo(fiber2.get(), fiber1.get());
assert3 = false;
}
@ -137,19 +136,19 @@ public:
const u32 id = thread_ids.Get();
assert2 = id == 0;
value1 += 1000;
Fiber::YieldTo(fiber3, thread_fibers[id]);
Fiber::YieldTo(fiber3.get(), thread_fibers[id].get());
}
void ExecuteThread(u32 id);
void CallFiber1() {
const u32 id = thread_ids.Get();
Fiber::YieldTo(thread_fibers[id], fiber1);
Fiber::YieldTo(thread_fibers[id].get(), fiber1.get());
}
void CallFiber2() {
const u32 id = thread_ids.Get();
Fiber::YieldTo(thread_fibers[id], fiber2);
Fiber::YieldTo(thread_fibers[id].get(), fiber2.get());
}
void Exit();
@ -185,8 +184,7 @@ static void WorkControl2_3(void* control) {
void TestControl2::ExecuteThread(u32 id) {
thread_ids.Register(id);
auto thread_fiber = Fiber::ThreadToFiber();
thread_fibers[id] = thread_fiber;
thread_fibers[id] = Fiber::ThreadToFiber();
}
void TestControl2::Exit() {
@ -241,23 +239,23 @@ public:
void DoWork1() {
value1 += 1;
Fiber::YieldTo(fiber1, fiber2);
Fiber::YieldTo(fiber1.get(), fiber2.get());
const u32 id = thread_ids.Get();
value3 += 1;
Fiber::YieldTo(fiber1, thread_fibers[id]);
Fiber::YieldTo(fiber1.get(), thread_fibers[id].get());
}
void DoWork2() {
value2 += 1;
const u32 id = thread_ids.Get();
Fiber::YieldTo(fiber2, thread_fibers[id]);
Fiber::YieldTo(fiber2.get(), thread_fibers[id].get());
}
void ExecuteThread(u32 id);
void CallFiber1() {
const u32 id = thread_ids.Get();
Fiber::YieldTo(thread_fibers[id], fiber1);
Fiber::YieldTo(thread_fibers[id].get(), fiber1.get());
}
void Exit();
@ -266,7 +264,7 @@ public:
u32 value2{};
u32 value3{};
ThreadIds thread_ids;
std::vector<std::shared_ptr<Common::Fiber>> thread_fibers;
std::vector<std::unique_ptr<Common::Fiber>> thread_fibers;
std::shared_ptr<Common::Fiber> fiber1;
std::shared_ptr<Common::Fiber> fiber2;
};
@ -283,8 +281,7 @@ static void WorkControl3_2(void* control) {
void TestControl3::ExecuteThread(u32 id) {
thread_ids.Register(id);
auto thread_fiber = Fiber::ThreadToFiber();
thread_fibers[id] = thread_fiber;
thread_fibers[id] = Fiber::ThreadToFiber();
}
void TestControl3::Exit() {
@ -332,7 +329,7 @@ public:
void Execute() {
thread_fiber = Fiber::ThreadToFiber();
Fiber::YieldTo(thread_fiber, fiber1);
Fiber::YieldTo(thread_fiber.get(), fiber1.get());
thread_fiber->Exit();
}
@ -340,7 +337,7 @@ public:
fiber1->SetRewindPoint(std::function<void(void*)>{WorkControl4}, this);
if (rewinded) {
goal_reached = true;
Fiber::YieldTo(fiber1, thread_fiber);
Fiber::YieldTo(fiber1.get(), thread_fiber.get());
}
rewinded = true;
fiber1->Rewind();