170 lines
5 KiB
C++
170 lines
5 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2
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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 "common/common.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/thread.h"
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namespace Kernel {
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class Mutex : public Object {
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public:
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std::string GetTypeName() const override { return "Mutex"; }
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std::string GetName() const override { return name; }
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static Kernel::HandleType GetStaticHandleType() { return Kernel::HandleType::Mutex; }
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Kernel::HandleType GetHandleType() const override { return Kernel::HandleType::Mutex; }
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bool initial_locked; ///< Initial lock state when mutex was created
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bool locked; ///< Current locked state
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Handle lock_thread; ///< Handle to thread that currently has mutex
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std::vector<Handle> waiting_threads; ///< Threads that are waiting for the mutex
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std::string name; ///< Name of mutex (optional)
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/**
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* Synchronize kernel object
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* @param wait Boolean wait set if current thread should wait as a result of sync operation
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* @return Result of operation, 0 on success, otherwise error code
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*/
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Result SyncRequest(bool* wait) override {
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// TODO(bunnei): ImplementMe
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locked = true;
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return 0;
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}
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/**
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* Wait for kernel object to synchronize
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* @param wait Boolean wait set if current thread should wait as a result of sync operation
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* @return Result of operation, 0 on success, otherwise error code
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*/
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Result WaitSynchronization(bool* wait) override {
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// TODO(bunnei): ImplementMe
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*wait = locked;
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if (locked) {
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Kernel::WaitCurrentThread(WAITTYPE_MUTEX, GetHandle());
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}
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return 0;
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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typedef std::multimap<Handle, Handle> MutexMap;
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static MutexMap g_mutex_held_locks;
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void MutexAcquireLock(Mutex* mutex, Handle thread) {
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g_mutex_held_locks.insert(std::make_pair(thread, mutex->GetHandle()));
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mutex->lock_thread = thread;
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}
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void MutexAcquireLock(Mutex* mutex) {
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Handle thread = GetCurrentThreadHandle();
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MutexAcquireLock(mutex, thread);
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}
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void MutexEraseLock(Mutex* mutex) {
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Handle handle = mutex->GetHandle();
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auto locked = g_mutex_held_locks.equal_range(mutex->lock_thread);
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for (MutexMap::iterator iter = locked.first; iter != locked.second; ++iter) {
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if ((*iter).second == handle) {
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g_mutex_held_locks.erase(iter);
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break;
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}
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}
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mutex->lock_thread = -1;
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}
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bool LockMutex(Mutex* mutex) {
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// Mutex alread locked?
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if (mutex->locked) {
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return false;
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}
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MutexAcquireLock(mutex);
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return true;
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}
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bool ReleaseMutexForThread(Mutex* mutex, Handle thread) {
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MutexAcquireLock(mutex, thread);
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Kernel::ResumeThreadFromWait(thread);
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return true;
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}
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bool ReleaseMutex(Mutex* mutex) {
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MutexEraseLock(mutex);
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bool woke_threads = false;
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// Find the next waiting thread for the mutex...
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while (!woke_threads && !mutex->waiting_threads.empty()) {
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std::vector<Handle>::iterator iter = mutex->waiting_threads.begin();
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woke_threads |= ReleaseMutexForThread(mutex, *iter);
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mutex->waiting_threads.erase(iter);
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}
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// Reset mutex lock thread handle, nothing is waiting
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if (!woke_threads) {
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mutex->locked = false;
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mutex->lock_thread = -1;
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}
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return woke_threads;
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}
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/**
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* Releases a mutex
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* @param handle Handle to mutex to release
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*/
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Result ReleaseMutex(Handle handle) {
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Mutex* mutex = Kernel::g_object_pool.GetFast<Mutex>(handle);
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_assert_msg_(KERNEL, (mutex != nullptr), "ReleaseMutex tried to release a nullptr mutex!");
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if (!ReleaseMutex(mutex)) {
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return -1;
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}
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return 0;
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}
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/**
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* Creates a mutex
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* @param handle Reference to handle for the newly created mutex
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* @param initial_locked Specifies if the mutex should be locked initially
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* @param name Optional name of mutex
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* @return Pointer to new Mutex object
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*/
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Mutex* CreateMutex(Handle& handle, bool initial_locked, const std::string& name) {
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Mutex* mutex = new Mutex;
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handle = Kernel::g_object_pool.Create(mutex);
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mutex->locked = mutex->initial_locked = initial_locked;
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mutex->name = name;
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// Acquire mutex with current thread if initialized as locked...
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if (mutex->locked) {
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MutexAcquireLock(mutex);
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// Otherwise, reset lock thread handle
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} else {
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mutex->lock_thread = -1;
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}
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return mutex;
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}
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/**
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* Creates a mutex
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* @param initial_locked Specifies if the mutex should be locked initially
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* @param name Optional name of mutex
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* @return Handle to newly created object
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*/
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Handle CreateMutex(bool initial_locked, const std::string& name) {
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Handle handle;
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Mutex* mutex = CreateMutex(handle, initial_locked, name);
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return handle;
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}
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} // namespace
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