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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/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
};
////////////////////////////////////////////////////////////////////////////////////////////////////
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 = GetCurrentThread();
__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
*/
Result 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 0;
}
} // namespace
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