Merge pull request #5266 from bunnei/kernel-synch

Rewrite KSynchronizationObject, KConditonVariable, and KAddressArbiter

1 files changed, 0 insertions, 170 deletions

diff --git a/src/core/hle/kernel/mutex.cpp b/src/core/hle/kernel/mutex.cpp
deleted file mode 100644
index 4f8075e0e..000000000
--- a/src/core/hle/kernel/mutex.cpp
+++ /dev/null
@@ -1,170 +0,0 @@
-// Copyright 2014 Citra Emulator Project
-// Licensed under GPLv2 or any later version
-// Refer to the license.txt file included.
-
-#include <memory>
-#include <utility>
-#include <vector>
-
-#include "common/assert.h"
-#include "common/logging/log.h"
-#include "core/core.h"
-#include "core/hle/kernel/errors.h"
-#include "core/hle/kernel/handle_table.h"
-#include "core/hle/kernel/k_scheduler.h"
-#include "core/hle/kernel/kernel.h"
-#include "core/hle/kernel/mutex.h"
-#include "core/hle/kernel/object.h"
-#include "core/hle/kernel/process.h"
-#include "core/hle/kernel/thread.h"
-#include "core/hle/result.h"
-#include "core/memory.h"
-
-namespace Kernel {
-
-/// Returns the number of threads that are waiting for a mutex, and the highest priority one among
-/// those.
-static std::pair<std::shared_ptr<Thread>, u32> GetHighestPriorityMutexWaitingThread(
-    const std::shared_ptr<Thread>& current_thread, VAddr mutex_addr) {
-
-    std::shared_ptr<Thread> highest_priority_thread;
-    u32 num_waiters = 0;
-
-    for (const auto& thread : current_thread->GetMutexWaitingThreads()) {
-        if (thread->GetMutexWaitAddress() != mutex_addr)
-            continue;
-
-        ++num_waiters;
-        if (highest_priority_thread == nullptr ||
-            thread->GetPriority() < highest_priority_thread->GetPriority()) {
-            highest_priority_thread = thread;
-        }
-    }
-
-    return {highest_priority_thread, num_waiters};
-}
-
-/// Update the mutex owner field of all threads waiting on the mutex to point to the new owner.
-static void TransferMutexOwnership(VAddr mutex_addr, std::shared_ptr<Thread> current_thread,
-                                   std::shared_ptr<Thread> new_owner) {
-    current_thread->RemoveMutexWaiter(new_owner);
-    const auto threads = current_thread->GetMutexWaitingThreads();
-    for (const auto& thread : threads) {
-        if (thread->GetMutexWaitAddress() != mutex_addr)
-            continue;
-
-        ASSERT(thread->GetLockOwner() == current_thread.get());
-        current_thread->RemoveMutexWaiter(thread);
-        if (new_owner != thread)
-            new_owner->AddMutexWaiter(thread);
-    }
-}
-
-Mutex::Mutex(Core::System& system) : system{system} {}
-Mutex::~Mutex() = default;
-
-ResultCode Mutex::TryAcquire(VAddr address, Handle holding_thread_handle,
-                             Handle requesting_thread_handle) {
-    // The mutex address must be 4-byte aligned
-    if ((address % sizeof(u32)) != 0) {
-        LOG_ERROR(Kernel, "Address is not 4-byte aligned! address={:016X}", address);
-        return ERR_INVALID_ADDRESS;
-    }
-
-    auto& kernel = system.Kernel();
-    std::shared_ptr<Thread> current_thread =
-        SharedFrom(kernel.CurrentScheduler()->GetCurrentThread());
-    {
-        KScopedSchedulerLock lock(kernel);
-        // The mutex address must be 4-byte aligned
-        if ((address % sizeof(u32)) != 0) {
-            return ERR_INVALID_ADDRESS;
-        }
-
-        const auto& handle_table = kernel.CurrentProcess()->GetHandleTable();
-        std::shared_ptr<Thread> holding_thread = handle_table.Get<Thread>(holding_thread_handle);
-        std::shared_ptr<Thread> requesting_thread =
-            handle_table.Get<Thread>(requesting_thread_handle);
-
-        // TODO(Subv): It is currently unknown if it is possible to lock a mutex in behalf of
-        // another thread.
-        ASSERT(requesting_thread == current_thread);
-
-        current_thread->SetSynchronizationResults(nullptr, RESULT_SUCCESS);
-
-        const u32 addr_value = system.Memory().Read32(address);
-
-        // If the mutex isn't being held, just return success.
-        if (addr_value != (holding_thread_handle | Mutex::MutexHasWaitersFlag)) {
-            return RESULT_SUCCESS;
-        }
-
-        if (holding_thread == nullptr) {
-            return ERR_INVALID_HANDLE;
-        }
-
-        // Wait until the mutex is released
-        current_thread->SetMutexWaitAddress(address);
-        current_thread->SetWaitHandle(requesting_thread_handle);
-
-        current_thread->SetStatus(ThreadStatus::WaitMutex);
-
-        // Update the lock holder thread's priority to prevent priority inversion.
-        holding_thread->AddMutexWaiter(current_thread);
-    }
-
-    {
-        KScopedSchedulerLock lock(kernel);
-        auto* owner = current_thread->GetLockOwner();
-        if (owner != nullptr) {
-            owner->RemoveMutexWaiter(current_thread);
-        }
-    }
-    return current_thread->GetSignalingResult();
-}
-
-std::pair<ResultCode, std::shared_ptr<Thread>> Mutex::Unlock(std::shared_ptr<Thread> owner,
-                                                             VAddr address) {
-    // The mutex address must be 4-byte aligned
-    if ((address % sizeof(u32)) != 0) {
-        LOG_ERROR(Kernel, "Address is not 4-byte aligned! address={:016X}", address);
-        return {ERR_INVALID_ADDRESS, nullptr};
-    }
-
-    auto [new_owner, num_waiters] = GetHighestPriorityMutexWaitingThread(owner, address);
-    if (new_owner == nullptr) {
-        system.Memory().Write32(address, 0);
-        return {RESULT_SUCCESS, nullptr};
-    }
-    // Transfer the ownership of the mutex from the previous owner to the new one.
-    TransferMutexOwnership(address, owner, new_owner);
-    u32 mutex_value = new_owner->GetWaitHandle();
-    if (num_waiters >= 2) {
-        // Notify the guest that there are still some threads waiting for the mutex
-        mutex_value |= Mutex::MutexHasWaitersFlag;
-    }
-    new_owner->SetSynchronizationResults(nullptr, RESULT_SUCCESS);
-    new_owner->SetLockOwner(nullptr);
-    new_owner->ResumeFromWait();
-
-    system.Memory().Write32(address, mutex_value);
-    return {RESULT_SUCCESS, new_owner};
-}
-
-ResultCode Mutex::Release(VAddr address) {
-    auto& kernel = system.Kernel();
-    KScopedSchedulerLock lock(kernel);
-
-    std::shared_ptr<Thread> current_thread =
-        SharedFrom(kernel.CurrentScheduler()->GetCurrentThread());
-
-    auto [result, new_owner] = Unlock(current_thread, address);
-
-    if (result != RESULT_SUCCESS && new_owner != nullptr) {
-        new_owner->SetSynchronizationResults(nullptr, result);
-    }
-
-    return result;
-}
-
-} // namespace Kernel