138 lines
3.7 KiB
C++
138 lines
3.7 KiB
C++
// 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/thread.h"
|
|
|
|
namespace Kernel {
|
|
|
|
class Mutex : public Object {
|
|
public:
|
|
const char* GetTypeName() { return "Mutex"; }
|
|
|
|
static Kernel::HandleType GetStaticHandleType() { return Kernel::HandleType::Mutex; }
|
|
Kernel::HandleType GetHandleType() const { 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
|
|
|
|
/// Synchronize kernel object
|
|
Result SyncRequest() {
|
|
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;
|
|
auto iter = mutex->waiting_threads.begin();
|
|
|
|
// Find the next waiting thread for the mutex...
|
|
while (!woke_threads && !mutex->waiting_threads.empty()) {
|
|
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);
|
|
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
|
|
*/
|
|
Mutex* CreateMutex(Handle& handle, bool initial_locked) {
|
|
Mutex* mutex = new Mutex;
|
|
handle = Kernel::g_object_pool.Create(mutex);
|
|
|
|
mutex->locked = mutex->initial_locked = initial_locked;
|
|
|
|
// 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
|
|
*/
|
|
Handle CreateMutex(bool initial_locked) {
|
|
Handle handle;
|
|
Mutex* mutex = CreateMutex(handle, initial_locked);
|
|
return handle;
|
|
}
|
|
|
|
} // namespace
|