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