138 lines
4 KiB
C++
138 lines
4 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <map>
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#include <vector>
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#include <boost/range/algorithm_ext/erase.hpp>
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#include "common/assert.h"
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#include "core/core.h"
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#include "core/hle/kernel/handle_table.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/kernel/mutex.h"
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#include "core/hle/kernel/object_address_table.h"
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#include "core/hle/kernel/thread.h"
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namespace Kernel {
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void ReleaseThreadMutexes(Thread* thread) {
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for (auto& mtx : thread->held_mutexes) {
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mtx->SetHasWaiters(false);
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mtx->SetHoldingThread(nullptr);
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mtx->WakeupAllWaitingThreads();
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}
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thread->held_mutexes.clear();
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}
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Mutex::Mutex() {}
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Mutex::~Mutex() {}
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SharedPtr<Mutex> Mutex::Create(SharedPtr<Kernel::Thread> holding_thread, VAddr guest_addr,
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std::string name) {
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SharedPtr<Mutex> mutex(new Mutex);
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mutex->guest_addr = guest_addr;
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mutex->name = std::move(name);
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// If mutex was initialized with a holding thread, acquire it by the holding thread
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if (holding_thread) {
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mutex->Acquire(holding_thread.get());
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}
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// Mutexes are referenced by guest address, so track this in the kernel
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g_object_address_table.Insert(guest_addr, mutex);
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return mutex;
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}
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bool Mutex::ShouldWait(Thread* thread) const {
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auto holding_thread = GetHoldingThread();
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return holding_thread != nullptr && thread != holding_thread;
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}
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void Mutex::Acquire(Thread* thread) {
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ASSERT_MSG(!ShouldWait(thread), "object unavailable!");
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priority = thread->current_priority;
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thread->held_mutexes.insert(this);
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SetHoldingThread(thread);
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thread->UpdatePriority();
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Core::System::GetInstance().PrepareReschedule();
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}
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ResultCode Mutex::Release(Thread* thread) {
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auto holding_thread = GetHoldingThread();
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ASSERT(holding_thread);
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// We can only release the mutex if it's held by the calling thread.
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ASSERT(thread == holding_thread);
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holding_thread->held_mutexes.erase(this);
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holding_thread->UpdatePriority();
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SetHoldingThread(nullptr);
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SetHasWaiters(!GetWaitingThreads().empty());
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WakeupAllWaitingThreads();
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Core::System::GetInstance().PrepareReschedule();
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return RESULT_SUCCESS;
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}
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void Mutex::AddWaitingThread(SharedPtr<Thread> thread) {
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WaitObject::AddWaitingThread(thread);
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thread->pending_mutexes.insert(this);
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SetHasWaiters(true);
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UpdatePriority();
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}
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void Mutex::RemoveWaitingThread(Thread* thread) {
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WaitObject::RemoveWaitingThread(thread);
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thread->pending_mutexes.erase(this);
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if (!GetHasWaiters())
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SetHasWaiters(!GetWaitingThreads().empty());
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UpdatePriority();
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}
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void Mutex::UpdatePriority() {
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if (!GetHoldingThread())
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return;
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u32 best_priority = THREADPRIO_LOWEST;
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for (auto& waiter : GetWaitingThreads()) {
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if (waiter->current_priority < best_priority)
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best_priority = waiter->current_priority;
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}
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if (best_priority != priority) {
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priority = best_priority;
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GetHoldingThread()->UpdatePriority();
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}
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}
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Handle Mutex::GetOwnerHandle() const {
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GuestState guest_state{Memory::Read32(guest_addr)};
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return guest_state.holding_thread_handle;
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}
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SharedPtr<Thread> Mutex::GetHoldingThread() const {
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GuestState guest_state{Memory::Read32(guest_addr)};
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return g_handle_table.Get<Thread>(guest_state.holding_thread_handle);
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}
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void Mutex::SetHoldingThread(SharedPtr<Thread> thread) {
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GuestState guest_state{Memory::Read32(guest_addr)};
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guest_state.holding_thread_handle.Assign(thread ? thread->guest_handle : 0);
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Memory::Write32(guest_addr, guest_state.raw);
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}
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bool Mutex::GetHasWaiters() const {
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GuestState guest_state{Memory::Read32(guest_addr)};
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return guest_state.has_waiters != 0;
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}
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void Mutex::SetHasWaiters(bool has_waiters) {
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GuestState guest_state{Memory::Read32(guest_addr)};
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guest_state.has_waiters.Assign(has_waiters ? 1 : 0);
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Memory::Write32(guest_addr, guest_state.raw);
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}
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} // namespace Kernel
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