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-rw-r--r--src/core/CMakeLists.txt2
-rw-r--r--src/core/hle/kernel/k_condition_variable.cpp347
-rw-r--r--src/core/hle/kernel/k_condition_variable.h59
-rw-r--r--src/core/hle/kernel/object.h5
4 files changed, 413 insertions, 0 deletions
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index cae80bfbf..a870cd8fe 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -158,6 +158,8 @@ add_library(core STATIC
hle/kernel/hle_ipc.cpp
hle/kernel/hle_ipc.h
hle/kernel/k_affinity_mask.h
+ hle/kernel/k_condition_variable.cpp
+ hle/kernel/k_condition_variable.h
hle/kernel/k_priority_queue.h
hle/kernel/k_scheduler.cpp
hle/kernel/k_scheduler.h
diff --git a/src/core/hle/kernel/k_condition_variable.cpp b/src/core/hle/kernel/k_condition_variable.cpp
new file mode 100644
index 000000000..ef5c17409
--- /dev/null
+++ b/src/core/hle/kernel/k_condition_variable.cpp
@@ -0,0 +1,347 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <vector>
+
+#include "core/arm/exclusive_monitor.h"
+#include "core/core.h"
+#include "core/hle/kernel/k_condition_variable.h"
+#include "core/hle/kernel/k_scheduler.h"
+#include "core/hle/kernel/k_scoped_scheduler_lock_and_sleep.h"
+#include "core/hle/kernel/k_synchronization_object.h"
+#include "core/hle/kernel/kernel.h"
+#include "core/hle/kernel/process.h"
+#include "core/hle/kernel/svc_common.h"
+#include "core/hle/kernel/svc_results.h"
+#include "core/hle/kernel/thread.h"
+#include "core/memory.h"
+
+namespace Kernel {
+
+namespace {
+
+bool ReadFromUser(Core::System& system, u32* out, VAddr address) {
+ *out = system.Memory().Read32(address);
+ return true;
+}
+
+bool WriteToUser(Core::System& system, VAddr address, const u32* p) {
+ system.Memory().Write32(address, *p);
+ return true;
+}
+
+bool UpdateLockAtomic(Core::System& system, u32* out, VAddr address, u32 if_zero,
+ u32 new_orr_mask) {
+ auto& monitor = system.Monitor();
+ const auto current_core = system.CurrentCoreIndex();
+
+ // Load the value from the address.
+ const auto expected = monitor.ExclusiveRead32(current_core, address);
+
+ // Orr in the new mask.
+ u32 value = expected | new_orr_mask;
+
+ // If the value is zero, use the if_zero value, otherwise use the newly orr'd value.
+ if (!expected) {
+ value = if_zero;
+ }
+
+ // Try to store.
+ if (!monitor.ExclusiveWrite32(current_core, address, value)) {
+ // If we failed to store, try again.
+ return UpdateLockAtomic(system, out, address, if_zero, new_orr_mask);
+ }
+
+ // We're done.
+ *out = expected;
+ return true;
+}
+
+} // namespace
+
+KConditionVariable::KConditionVariable(Core::System& system_)
+ : system{system_}, kernel{system.Kernel()} {}
+
+KConditionVariable::~KConditionVariable() = default;
+
+ResultCode KConditionVariable::SignalToAddress(VAddr addr) {
+ Thread* owner_thread = kernel.CurrentScheduler()->GetCurrentThread();
+
+ // Signal the address.
+ {
+ KScopedSchedulerLock sl(kernel);
+
+ // Remove waiter thread.
+ s32 num_waiters{};
+ Thread* next_owner_thread =
+ owner_thread->RemoveWaiterByKey(std::addressof(num_waiters), addr);
+
+ // Determine the next tag.
+ u32 next_value{};
+ if (next_owner_thread) {
+ next_value = next_owner_thread->GetAddressKeyValue();
+ if (num_waiters > 1) {
+ next_value |= Svc::HandleWaitMask;
+ }
+
+ next_owner_thread->SetSyncedObject(nullptr, RESULT_SUCCESS);
+ next_owner_thread->Wakeup();
+ }
+
+ // Write the value to userspace.
+ if (!WriteToUser(system, addr, std::addressof(next_value))) {
+ if (next_owner_thread) {
+ next_owner_thread->SetSyncedObject(nullptr, Svc::ResultInvalidCurrentMemory);
+ }
+
+ return Svc::ResultInvalidCurrentMemory;
+ }
+ }
+
+ return RESULT_SUCCESS;
+}
+
+ResultCode KConditionVariable::WaitForAddress(Handle handle, VAddr addr, u32 value) {
+ Thread* cur_thread = kernel.CurrentScheduler()->GetCurrentThread();
+
+ // Wait for the address.
+ {
+ std::shared_ptr<Thread> owner_thread;
+ ASSERT(!owner_thread);
+ {
+ KScopedSchedulerLock sl(kernel);
+ cur_thread->SetSyncedObject(nullptr, RESULT_SUCCESS);
+
+ // Check if the thread should terminate.
+ R_UNLESS(!cur_thread->IsTerminationRequested(), Svc::ResultTerminationRequested);
+
+ {
+ // Read the tag from userspace.
+ u32 test_tag{};
+ R_UNLESS(ReadFromUser(system, std::addressof(test_tag), addr),
+ Svc::ResultInvalidCurrentMemory);
+
+ // If the tag isn't the handle (with wait mask), we're done.
+ R_UNLESS(test_tag == (handle | Svc::HandleWaitMask), RESULT_SUCCESS);
+
+ // Get the lock owner thread.
+ owner_thread = kernel.CurrentProcess()->GetHandleTable().Get<Thread>(handle);
+ R_UNLESS(owner_thread, Svc::ResultInvalidHandle);
+
+ // Update the lock.
+ cur_thread->SetAddressKey(addr, value);
+ owner_thread->AddWaiter(cur_thread);
+ cur_thread->SetState(ThreadState::Waiting);
+ cur_thread->SetMutexWaitAddressForDebugging(addr);
+ }
+ }
+ ASSERT(owner_thread);
+ }
+
+ // Remove the thread as a waiter from the lock owner.
+ {
+ KScopedSchedulerLock sl(kernel);
+ Thread* owner_thread = cur_thread->GetLockOwner();
+ if (owner_thread != nullptr) {
+ owner_thread->RemoveWaiter(cur_thread);
+ }
+ }
+
+ // Get the wait result.
+ KSynchronizationObject* dummy{};
+ return cur_thread->GetWaitResult(std::addressof(dummy));
+}
+
+Thread* KConditionVariable::SignalImpl(Thread* thread) {
+ // Check pre-conditions.
+ ASSERT(kernel.GlobalSchedulerContext().IsLocked());
+
+ // Update the tag.
+ VAddr address = thread->GetAddressKey();
+ u32 own_tag = thread->GetAddressKeyValue();
+
+ u32 prev_tag{};
+ bool can_access{};
+ {
+ // TODO(bunnei): We should disable interrupts here via KScopedInterruptDisable.
+ // TODO(bunnei): We should call CanAccessAtomic(..) here.
+ can_access = true;
+ if (can_access) {
+ UpdateLockAtomic(system, std::addressof(prev_tag), address, own_tag,
+ Svc::HandleWaitMask);
+ }
+ }
+
+ Thread* thread_to_close = nullptr;
+ if (can_access) {
+ if (prev_tag == InvalidHandle) {
+ // If nobody held the lock previously, we're all good.
+ thread->SetSyncedObject(nullptr, RESULT_SUCCESS);
+ thread->Wakeup();
+ } else {
+ // Get the previous owner.
+ auto owner_thread = kernel.CurrentProcess()->GetHandleTable().Get<Thread>(
+ prev_tag & ~Svc::HandleWaitMask);
+
+ if (owner_thread) {
+ // Add the thread as a waiter on the owner.
+ owner_thread->AddWaiter(thread);
+ thread_to_close = owner_thread.get();
+ } else {
+ // The lock was tagged with a thread that doesn't exist.
+ thread->SetSyncedObject(nullptr, Svc::ResultInvalidState);
+ thread->Wakeup();
+ }
+ }
+ } else {
+ // If the address wasn't accessible, note so.
+ thread->SetSyncedObject(nullptr, Svc::ResultInvalidCurrentMemory);
+ thread->Wakeup();
+ }
+
+ return thread_to_close;
+}
+
+void KConditionVariable::Signal(u64 cv_key, s32 count) {
+ // Prepare for signaling.
+ constexpr int MaxThreads = 16;
+
+ // TODO(bunnei): This should just be Thread once we implement KAutoObject instead of using
+ // std::shared_ptr.
+ std::vector<std::shared_ptr<Thread>> thread_list;
+ std::array<Thread*, MaxThreads> thread_array;
+ s32 num_to_close{};
+
+ // Perform signaling.
+ s32 num_waiters{};
+ {
+ KScopedSchedulerLock sl(kernel);
+
+ auto it = thread_tree.nfind_light({cv_key, -1});
+ while ((it != thread_tree.end()) && (count <= 0 || num_waiters < count) &&
+ (it->GetConditionVariableKey() == cv_key)) {
+ Thread* target_thread = std::addressof(*it);
+
+ if (Thread* thread = SignalImpl(target_thread); thread != nullptr) {
+ if (num_to_close < MaxThreads) {
+ thread_array[num_to_close++] = thread;
+ } else {
+ thread_list.push_back(SharedFrom(thread));
+ }
+ }
+
+ it = thread_tree.erase(it);
+ target_thread->ClearConditionVariable();
+ ++num_waiters;
+ }
+
+ // If we have no waiters, clear the has waiter flag.
+ if (it == thread_tree.end() || it->GetConditionVariableKey() != cv_key) {
+ const u32 has_waiter_flag{};
+ WriteToUser(system, cv_key, std::addressof(has_waiter_flag));
+ }
+ }
+
+ // Close threads in the array.
+ for (auto i = 0; i < num_to_close; ++i) {
+ thread_array[i]->Close();
+ }
+
+ // Close threads in the list.
+ for (auto it = thread_list.begin(); it != thread_list.end(); it = thread_list.erase(it)) {
+ (*it)->Close();
+ }
+}
+
+ResultCode KConditionVariable::Wait(VAddr addr, u64 key, u32 value, s64 timeout) {
+ // Prepare to wait.
+ Thread* cur_thread = kernel.CurrentScheduler()->GetCurrentThread();
+ Handle timer = InvalidHandle;
+
+ {
+ KScopedSchedulerLockAndSleep slp(kernel, timer, cur_thread, timeout);
+
+ // Set the synced object.
+ cur_thread->SetSyncedObject(nullptr, Svc::ResultTimedOut);
+
+ // Check that the thread isn't terminating.
+ if (cur_thread->IsTerminationRequested()) {
+ slp.CancelSleep();
+ return Svc::ResultTerminationRequested;
+ }
+
+ // Update the value and process for the next owner.
+ {
+ // Remove waiter thread.
+ s32 num_waiters{};
+ Thread* next_owner_thread =
+ cur_thread->RemoveWaiterByKey(std::addressof(num_waiters), addr);
+
+ // Update for the next owner thread.
+ u32 next_value{};
+ if (next_owner_thread != nullptr) {
+ // Get the next tag value.
+ next_value = next_owner_thread->GetAddressKeyValue();
+ if (num_waiters > 1) {
+ next_value |= Svc::HandleWaitMask;
+ }
+
+ // Wake up the next owner.
+ next_owner_thread->SetSyncedObject(nullptr, RESULT_SUCCESS);
+ next_owner_thread->Wakeup();
+ }
+
+ // Write to the cv key.
+ {
+ const u32 has_waiter_flag = 1;
+ WriteToUser(system, key, std::addressof(has_waiter_flag));
+ // TODO(bunnei): We should call DataMemoryBarrier(..) here.
+ }
+
+ // Write the value to userspace.
+ if (!WriteToUser(system, addr, std::addressof(next_value))) {
+ slp.CancelSleep();
+ return Svc::ResultInvalidCurrentMemory;
+ }
+ }
+
+ // Update condition variable tracking.
+ {
+ cur_thread->SetConditionVariable(std::addressof(thread_tree), addr, key, value);
+ thread_tree.insert(*cur_thread);
+ }
+
+ // If the timeout is non-zero, set the thread as waiting.
+ if (timeout != 0) {
+ cur_thread->SetState(ThreadState::Waiting);
+ cur_thread->SetMutexWaitAddressForDebugging(addr);
+ }
+ }
+
+ // Cancel the timer wait.
+ if (timer != InvalidHandle) {
+ auto& time_manager = kernel.TimeManager();
+ time_manager.UnscheduleTimeEvent(timer);
+ }
+
+ // Remove from the condition variable.
+ {
+ KScopedSchedulerLock sl(kernel);
+
+ if (Thread* owner = cur_thread->GetLockOwner(); owner != nullptr) {
+ owner->RemoveWaiter(cur_thread);
+ }
+
+ if (cur_thread->IsWaitingForConditionVariable()) {
+ thread_tree.erase(thread_tree.iterator_to(*cur_thread));
+ cur_thread->ClearConditionVariable();
+ }
+ }
+
+ // Get the result.
+ KSynchronizationObject* dummy{};
+ return cur_thread->GetWaitResult(std::addressof(dummy));
+}
+
+} // namespace Kernel
diff --git a/src/core/hle/kernel/k_condition_variable.h b/src/core/hle/kernel/k_condition_variable.h
new file mode 100644
index 000000000..98ed5b323
--- /dev/null
+++ b/src/core/hle/kernel/k_condition_variable.h
@@ -0,0 +1,59 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/assert.h"
+#include "common/common_types.h"
+
+#include "core/hle/kernel/k_scheduler.h"
+#include "core/hle/kernel/kernel.h"
+#include "core/hle/kernel/thread.h"
+#include "core/hle/result.h"
+
+namespace Core {
+class System;
+}
+
+namespace Kernel {
+
+class KConditionVariable {
+public:
+ using ThreadTree = typename Thread::ConditionVariableThreadTreeType;
+
+ explicit KConditionVariable(Core::System& system_);
+ ~KConditionVariable();
+
+ // Arbitration
+ [[nodiscard]] ResultCode SignalToAddress(VAddr addr);
+ [[nodiscard]] ResultCode WaitForAddress(Handle handle, VAddr addr, u32 value);
+
+ // Condition variable
+ void Signal(u64 cv_key, s32 count);
+ [[nodiscard]] ResultCode Wait(VAddr addr, u64 key, u32 value, s64 timeout);
+
+private:
+ [[nodiscard]] Thread* SignalImpl(Thread* thread);
+
+ ThreadTree thread_tree;
+
+ Core::System& system;
+ KernelCore& kernel;
+};
+
+inline void BeforeUpdatePriority(const KernelCore& kernel, KConditionVariable::ThreadTree* tree,
+ Thread* thread) {
+ ASSERT(kernel.GlobalSchedulerContext().IsLocked());
+
+ tree->erase(tree->iterator_to(*thread));
+}
+
+inline void AfterUpdatePriority(const KernelCore& kernel, KConditionVariable::ThreadTree* tree,
+ Thread* thread) {
+ ASSERT(kernel.GlobalSchedulerContext().IsLocked());
+
+ tree->insert(*thread);
+}
+
+} // namespace Kernel
diff --git a/src/core/hle/kernel/object.h b/src/core/hle/kernel/object.h
index e3391e2af..27124ef67 100644
--- a/src/core/hle/kernel/object.h
+++ b/src/core/hle/kernel/object.h
@@ -50,6 +50,11 @@ public:
}
virtual HandleType GetHandleType() const = 0;
+ void Close() {
+ // TODO(bunnei): This is a placeholder to decrement the reference count, which we will use
+ // when we implement KAutoObject instead of using shared_ptr.
+ }
+
/**
* Check if a thread can wait on the object
* @return True if a thread can wait on the object, otherwise false
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-21 23:37:59 +0100