From 3f0b93925f082b6defe9454f16f1260539994217 Mon Sep 17 00:00:00 2001 From: bunnei Date: Mon, 11 Apr 2022 20:57:32 -0700 Subject: [PATCH] core: hle: kernel: k_thread: Rework dummy thread waiting. --- src/core/hle/kernel/k_thread.cpp | 39 ++++++++++++-------------------- src/core/hle/kernel/k_thread.h | 10 ++++---- 2 files changed, 21 insertions(+), 28 deletions(-) diff --git a/src/core/hle/kernel/k_thread.cpp b/src/core/hle/kernel/k_thread.cpp index d3bb1c871..af71987e8 100644 --- a/src/core/hle/kernel/k_thread.cpp +++ b/src/core/hle/kernel/k_thread.cpp @@ -723,10 +723,10 @@ void KThread::UpdateState() { ASSERT(kernel.GlobalSchedulerContext().IsLocked()); // Set our suspend flags in state. - const ThreadState old_state = thread_state; + const ThreadState old_state = thread_state.load(std::memory_order_relaxed); const auto new_state = static_cast(this->GetSuspendFlags()) | (old_state & ThreadState::Mask); - thread_state = new_state; + thread_state.store(new_state, std::memory_order_relaxed); // Note the state change in scheduler. if (new_state != old_state) { @@ -738,8 +738,8 @@ void KThread::Continue() { ASSERT(kernel.GlobalSchedulerContext().IsLocked()); // Clear our suspend flags in state. - const ThreadState old_state = thread_state; - thread_state = old_state & ThreadState::Mask; + const ThreadState old_state = thread_state.load(std::memory_order_relaxed); + thread_state.store(old_state & ThreadState::Mask, std::memory_order_relaxed); // Note the state change in scheduler. KScheduler::OnThreadStateChanged(kernel, this, old_state); @@ -1079,17 +1079,10 @@ void KThread::IfDummyThreadTryWait() { return; } - // Block until we can grab the lock. - KScopedSpinLock lk{dummy_wait_lock}; -} - -void KThread::IfDummyThreadBeginWait() { - if (!IsDummyThread()) { - return; - } - - // Ensure the thread will block when IfDummyThreadTryWait is called. - dummy_wait_lock.Lock(); + // Block until we are no longer waiting. + std::unique_lock lk(dummy_wait_lock); + dummy_wait_cv.wait( + lk, [&] { return GetState() != ThreadState::Waiting || kernel.IsShuttingDown(); }); } void KThread::IfDummyThreadEndWait() { @@ -1097,8 +1090,8 @@ void KThread::IfDummyThreadEndWait() { return; } - // Ensure the thread will no longer block. - dummy_wait_lock.Unlock(); + // Wake up the waiting thread. + dummy_wait_cv.notify_one(); } void KThread::BeginWait(KThreadQueue* queue) { @@ -1107,9 +1100,6 @@ void KThread::BeginWait(KThreadQueue* queue) { // Set our wait queue. wait_queue = queue; - - // Special case for dummy threads to ensure they block. - IfDummyThreadBeginWait(); } void KThread::NotifyAvailable(KSynchronizationObject* signaled_object, ResultCode wait_result_) { @@ -1158,10 +1148,11 @@ void KThread::SetState(ThreadState state) { SetMutexWaitAddressForDebugging({}); SetWaitReasonForDebugging({}); - const ThreadState old_state = thread_state; - thread_state = - static_cast((old_state & ~ThreadState::Mask) | (state & ThreadState::Mask)); - if (thread_state != old_state) { + const ThreadState old_state = thread_state.load(std::memory_order_relaxed); + thread_state.store( + static_cast((old_state & ~ThreadState::Mask) | (state & ThreadState::Mask)), + std::memory_order_relaxed); + if (thread_state.load(std::memory_order_relaxed) != old_state) { KScheduler::OnThreadStateChanged(kernel, this, old_state); } } diff --git a/src/core/hle/kernel/k_thread.h b/src/core/hle/kernel/k_thread.h index c141fc11b..4892fdf76 100644 --- a/src/core/hle/kernel/k_thread.h +++ b/src/core/hle/kernel/k_thread.h @@ -6,6 +6,8 @@ #include #include +#include +#include #include #include #include @@ -257,11 +259,11 @@ public: [[nodiscard]] std::shared_ptr& GetHostContext(); [[nodiscard]] ThreadState GetState() const { - return thread_state & ThreadState::Mask; + return thread_state.load(std::memory_order_relaxed) & ThreadState::Mask; } [[nodiscard]] ThreadState GetRawState() const { - return thread_state; + return thread_state.load(std::memory_order_relaxed); } void SetState(ThreadState state); @@ -643,7 +645,6 @@ public: // blocking as needed. void IfDummyThreadTryWait(); - void IfDummyThreadBeginWait(); void IfDummyThreadEndWait(); private: @@ -764,12 +765,13 @@ private: bool resource_limit_release_hint{}; StackParameters stack_parameters{}; Common::SpinLock context_guard{}; - KSpinLock dummy_wait_lock{}; // For emulation std::shared_ptr host_context{}; bool is_single_core{}; ThreadType thread_type{}; + std::mutex dummy_wait_lock; + std::condition_variable dummy_wait_cv; // For debugging std::vector wait_objects_for_debugging;