145 lines
4.6 KiB
C++
145 lines
4.6 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 "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 WaitObject {
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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 const HandleType HANDLE_TYPE = HandleType::Mutex;
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HandleType GetHandleType() const override { return HANDLE_TYPE; }
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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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std::string name; ///< Name of mutex (optional)
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SharedPtr<Thread> holding_thread; ///< Thread that has acquired the mutex
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bool ShouldWait() override;
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void Acquire() override;
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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typedef std::multimap<SharedPtr<Thread>, SharedPtr<Mutex>> MutexMap;
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static MutexMap g_mutex_held_locks;
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/**
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* Acquires the specified mutex for the specified thread
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* @param mutex Mutex that is to be acquired
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* @param thread Thread that will acquire the mutex
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*/
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static void MutexAcquireLock(Mutex* mutex, Thread* thread) {
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g_mutex_held_locks.insert(std::make_pair(thread, mutex));
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mutex->holding_thread = thread;
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}
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/**
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* Resumes a thread waiting for the specified mutex
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* @param mutex The mutex that some thread is waiting on
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*/
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static void ResumeWaitingThread(Mutex* mutex) {
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// Find the next waiting thread for the mutex...
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auto next_thread = mutex->WakeupNextThread();
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if (next_thread != nullptr) {
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MutexAcquireLock(mutex, next_thread);
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} else {
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// Reset mutex lock thread handle, nothing is waiting
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mutex->locked = false;
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mutex->holding_thread = nullptr;
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}
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}
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void ReleaseThreadMutexes(Thread* thread) {
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auto locked = g_mutex_held_locks.equal_range(thread);
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// Release every mutex that the thread holds, and resume execution on the waiting threads
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for (auto iter = locked.first; iter != locked.second; ++iter) {
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ResumeWaitingThread(iter->second.get());
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}
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// Erase all the locks that this thread holds
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g_mutex_held_locks.erase(thread);
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}
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static bool ReleaseMutex(Mutex* mutex) {
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if (mutex->locked) {
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auto locked = g_mutex_held_locks.equal_range(mutex->holding_thread);
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for (MutexMap::iterator iter = locked.first; iter != locked.second; ++iter) {
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if (iter->second == mutex) {
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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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ResumeWaitingThread(mutex);
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}
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return true;
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}
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ResultCode ReleaseMutex(Handle handle) {
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Mutex* mutex = Kernel::g_handle_table.Get<Mutex>(handle).get();
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if (mutex == nullptr) return InvalidHandle(ErrorModule::Kernel);
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if (!ReleaseMutex(mutex)) {
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// TODO(yuriks): Verify error code, this one was pulled out of thin air. I'm not even sure
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// what error condition this is supposed to be signaling.
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return ResultCode(ErrorDescription::AlreadyDone, ErrorModule::Kernel,
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ErrorSummary::NothingHappened, ErrorLevel::Temporary);
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}
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return RESULT_SUCCESS;
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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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static Mutex* CreateMutex(Handle& handle, bool initial_locked, const std::string& name) {
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Mutex* mutex = new Mutex;
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// TODO(yuriks): Fix error reporting
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handle = Kernel::g_handle_table.Create(mutex).ValueOr(INVALID_HANDLE);
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mutex->locked = mutex->initial_locked = initial_locked;
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mutex->name = name;
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mutex->holding_thread = nullptr;
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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, GetCurrentThread());
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return mutex;
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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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bool Mutex::ShouldWait() {
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return locked && holding_thread != GetCurrentThread();
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}
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void Mutex::Acquire() {
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_assert_msg_(Kernel, !ShouldWait(), "object unavailable!");
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locked = true;
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MutexAcquireLock(this, GetCurrentThread());
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}
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} // namespace
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