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Merge pull request #6041 from bunnei/fiber-leaks 

common: fiber: Use weak_ptr when yielding.
This commit is contained in:
bunnei 2021-03-08 13:51:37 -08:00 committed by GitHub
parent 9d77ae39de 8f7eb194af
commit 69ce5e41eb
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 35 additions and 37 deletions
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15
src/common/fiber.cpp
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@ -116,17 +116,20 @@ void Fiber::Rewind() {
boost::context::detail::jump_fcontext(impl->rewind_context, this); 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(std::weak_ptr<Fiber> weak_from, Fiber& to) {
ASSERT_MSG(from != nullptr, "Yielding fiber is null!"); to.impl->guard.lock();
ASSERT_MSG(to != nullptr, "Next fiber is null!"); to.impl->previous_fiber = weak_from.lock();
to->impl->guard.lock();
to->impl->previous_fiber = from; auto transfer = boost::context::detail::jump_fcontext(to.impl->context, &to);
auto transfer = boost::context::detail::jump_fcontext(to->impl->context, to.get());
// "from" might no longer be valid if the thread was killed
if (auto from = weak_from.lock()) {
ASSERT(from->impl->previous_fiber != nullptr); ASSERT(from->impl->previous_fiber != nullptr);
from->impl->previous_fiber->impl->context = transfer.fctx; from->impl->previous_fiber->impl->context = transfer.fctx;
from->impl->previous_fiber->impl->guard.unlock(); from->impl->previous_fiber->impl->guard.unlock();
from->impl->previous_fiber.reset(); from->impl->previous_fiber.reset();
} }
}
std::shared_ptr<Fiber> Fiber::ThreadToFiber() { std::shared_ptr<Fiber> Fiber::ThreadToFiber() {
std::shared_ptr<Fiber> fiber = std::shared_ptr<Fiber>{new Fiber()}; std::shared_ptr<Fiber> fiber = std::shared_ptr<Fiber>{new Fiber()};

2
src/common/fiber.h
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@ -41,7 +41,7 @@ public:
/// Yields control from Fiber 'from' to Fiber 'to' /// Yields control from Fiber 'from' to Fiber 'to'
/// Fiber 'from' must be the currently running fiber. /// Fiber 'from' must be the currently running fiber.
static void YieldTo(std::shared_ptr<Fiber> from, std::shared_ptr<Fiber> to); static void YieldTo(std::weak_ptr<Fiber> weak_from, Fiber& to);
[[nodiscard]] static std::shared_ptr<Fiber> ThreadToFiber(); [[nodiscard]] static std::shared_ptr<Fiber> ThreadToFiber();
void SetRewindPoint(std::function<void(void*)>&& rewind_func, void* rewind_param); void SetRewindPoint(std::function<void(void*)>&& rewind_func, void* rewind_param);

8
src/core/cpu_manager.cpp
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@ -148,7 +148,7 @@ void CpuManager::MultiCoreRunSuspendThread() {
auto core = kernel.GetCurrentHostThreadID(); auto core = kernel.GetCurrentHostThreadID();
auto& scheduler = *kernel.CurrentScheduler(); auto& scheduler = *kernel.CurrentScheduler();
Kernel::KThread* current_thread = scheduler.GetCurrentThread(); 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);
ASSERT(scheduler.ContextSwitchPending()); ASSERT(scheduler.ContextSwitchPending());
ASSERT(core == kernel.GetCurrentHostThreadID()); ASSERT(core == kernel.GetCurrentHostThreadID());
scheduler.RescheduleCurrentCore(); scheduler.RescheduleCurrentCore();
@ -245,7 +245,7 @@ void CpuManager::SingleCoreRunSuspendThread() {
auto core = kernel.GetCurrentHostThreadID(); auto core = kernel.GetCurrentHostThreadID();
auto& scheduler = *kernel.CurrentScheduler(); auto& scheduler = *kernel.CurrentScheduler();
Kernel::KThread* current_thread = scheduler.GetCurrentThread(); 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);
ASSERT(scheduler.ContextSwitchPending()); ASSERT(scheduler.ContextSwitchPending());
ASSERT(core == kernel.GetCurrentHostThreadID()); ASSERT(core == kernel.GetCurrentHostThreadID());
scheduler.RescheduleCurrentCore(); scheduler.RescheduleCurrentCore();
@ -271,7 +271,7 @@ void CpuManager::PreemptSingleCore(bool from_running_enviroment) {
scheduler.Unload(scheduler.GetCurrentThread()); scheduler.Unload(scheduler.GetCurrentThread());
auto& next_scheduler = kernel.Scheduler(current_core); auto& next_scheduler = kernel.Scheduler(current_core);
Common::Fiber::YieldTo(current_thread->GetHostContext(), next_scheduler.ControlContext()); Common::Fiber::YieldTo(current_thread->GetHostContext(), *next_scheduler.ControlContext());
} }
// May have changed scheduler // May have changed scheduler
@ -363,7 +363,7 @@ void CpuManager::RunThread(std::size_t core) {
auto current_thread = system.Kernel().CurrentScheduler()->GetCurrentThread(); auto current_thread = system.Kernel().CurrentScheduler()->GetCurrentThread();
data.is_running = true; data.is_running = true;
Common::Fiber::YieldTo(data.host_context, current_thread->GetHostContext()); Common::Fiber::YieldTo(data.host_context, *current_thread->GetHostContext());
data.is_running = false; data.is_running = false;
data.is_paused = true; data.is_paused = true;
data.exit_barrier->Wait(); data.exit_barrier->Wait();

11
src/core/hle/kernel/k_scheduler.cpp
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@ -734,7 +734,7 @@ void KScheduler::ScheduleImpl() {
} }
guard.unlock(); guard.unlock();
Common::Fiber::YieldTo(*old_context, switch_fiber); Common::Fiber::YieldTo(*old_context, *switch_fiber);
/// When a thread wakes up, the scheduler may have changed to other in another core. /// When a thread wakes up, the scheduler may have changed to other in another core.
auto& next_scheduler = *system.Kernel().CurrentScheduler(); auto& next_scheduler = *system.Kernel().CurrentScheduler();
next_scheduler.SwitchContextStep2(); next_scheduler.SwitchContextStep2();
@ -769,13 +769,8 @@ void KScheduler::SwitchToCurrent() {
break; break;
} }
} }
std::shared_ptr<Common::Fiber>* next_context; auto thread = next_thread ? next_thread : idle_thread;
if (next_thread != nullptr) { Common::Fiber::YieldTo(switch_fiber, *thread->GetHostContext());
next_context = &next_thread->GetHostContext();
} else {
next_context = &idle_thread->GetHostContext();
}
Common::Fiber::YieldTo(switch_fiber, *next_context);
} while (!is_switch_pending()); } while (!is_switch_pending());
} }
} }

28
src/tests/common/fibers.cpp
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@ -67,7 +67,7 @@ void TestControl1::DoWork() {
value++; value++;
} }
results[id] = value; results[id] = value;
Fiber::YieldTo(work_fibers[id], thread_fibers[id]); Fiber::YieldTo(work_fibers[id], *thread_fibers[id]);
} }
void TestControl1::ExecuteThread(u32 id) { void TestControl1::ExecuteThread(u32 id) {
@ -76,7 +76,7 @@ void TestControl1::ExecuteThread(u32 id) {
thread_fibers[id] = thread_fiber; thread_fibers[id] = thread_fiber;
work_fibers[id] = std::make_shared<Fiber>(std::function<void(void*)>{WorkControl1}, this); work_fibers[id] = std::make_shared<Fiber>(std::function<void(void*)>{WorkControl1}, this);
items[id] = rand() % 256; items[id] = rand() % 256;
Fiber::YieldTo(thread_fibers[id], work_fibers[id]); Fiber::YieldTo(thread_fibers[id], *work_fibers[id]);
thread_fibers[id]->Exit(); thread_fibers[id]->Exit();
} }
@ -117,11 +117,11 @@ public:
for (u32 i = 0; i < 12000; i++) { for (u32 i = 0; i < 12000; i++) {
value1 += i; value1 += i;
} }
Fiber::YieldTo(fiber1, fiber3); Fiber::YieldTo(fiber1, *fiber3);
const u32 id = thread_ids.Get(); const u32 id = thread_ids.Get();
assert1 = id == 1; assert1 = id == 1;
value2 += 5000; value2 += 5000;
Fiber::YieldTo(fiber1, thread_fibers[id]); Fiber::YieldTo(fiber1, *thread_fibers[id]);
} }
void DoWork2() { void DoWork2() {
@ -129,7 +129,7 @@ public:
; ;
value2 = 2000; value2 = 2000;
trap = false; trap = false;
Fiber::YieldTo(fiber2, fiber1); Fiber::YieldTo(fiber2, *fiber1);
assert3 = false; assert3 = false;
} }
@ -137,19 +137,19 @@ public:
const u32 id = thread_ids.Get(); const u32 id = thread_ids.Get();
assert2 = id == 0; assert2 = id == 0;
value1 += 1000; value1 += 1000;
Fiber::YieldTo(fiber3, thread_fibers[id]); Fiber::YieldTo(fiber3, *thread_fibers[id]);
} }
void ExecuteThread(u32 id); void ExecuteThread(u32 id);
void CallFiber1() { void CallFiber1() {
const u32 id = thread_ids.Get(); const u32 id = thread_ids.Get();
Fiber::YieldTo(thread_fibers[id], fiber1); Fiber::YieldTo(thread_fibers[id], *fiber1);
} }
void CallFiber2() { void CallFiber2() {
const u32 id = thread_ids.Get(); const u32 id = thread_ids.Get();
Fiber::YieldTo(thread_fibers[id], fiber2); Fiber::YieldTo(thread_fibers[id], *fiber2);
} }
void Exit(); void Exit();
@ -241,23 +241,23 @@ public:
void DoWork1() { void DoWork1() {
value1 += 1; value1 += 1;
Fiber::YieldTo(fiber1, fiber2); Fiber::YieldTo(fiber1, *fiber2);
const u32 id = thread_ids.Get(); const u32 id = thread_ids.Get();
value3 += 1; value3 += 1;
Fiber::YieldTo(fiber1, thread_fibers[id]); Fiber::YieldTo(fiber1, *thread_fibers[id]);
} }
void DoWork2() { void DoWork2() {
value2 += 1; value2 += 1;
const u32 id = thread_ids.Get(); const u32 id = thread_ids.Get();
Fiber::YieldTo(fiber2, thread_fibers[id]); Fiber::YieldTo(fiber2, *thread_fibers[id]);
} }
void ExecuteThread(u32 id); void ExecuteThread(u32 id);
void CallFiber1() { void CallFiber1() {
const u32 id = thread_ids.Get(); const u32 id = thread_ids.Get();
Fiber::YieldTo(thread_fibers[id], fiber1); Fiber::YieldTo(thread_fibers[id], *fiber1);
} }
void Exit(); void Exit();
@ -332,7 +332,7 @@ public:
void Execute() { void Execute() {
thread_fiber = Fiber::ThreadToFiber(); thread_fiber = Fiber::ThreadToFiber();
Fiber::YieldTo(thread_fiber, fiber1); Fiber::YieldTo(thread_fiber, *fiber1);
thread_fiber->Exit(); thread_fiber->Exit();
} }
@ -340,7 +340,7 @@ public:
fiber1->SetRewindPoint(std::function<void(void*)>{WorkControl4}, this); fiber1->SetRewindPoint(std::function<void(void*)>{WorkControl4}, this);
if (rewinded) { if (rewinded) {
goal_reached = true; goal_reached = true;
Fiber::YieldTo(fiber1, thread_fiber); Fiber::YieldTo(fiber1, *thread_fiber);
} }
rewinded = true; rewinded = true;
fiber1->Rewind(); fiber1->Rewind();