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Merge pull request #256 from Subv/mutex

Kernel/Mutex: Properly lock the mutex when a thread enters it
This commit is contained in:
bunnei 2014-12-10 22:52:55 -05:00
commit 3a75c8069e
3 changed files with 67 additions and 37 deletions

View file

@ -27,21 +27,7 @@ public:
std::vector<Handle> waiting_threads; ///< Threads that are waiting for the mutex std::vector<Handle> waiting_threads; ///< Threads that are waiting for the mutex
std::string name; ///< Name of mutex (optional) std::string name; ///< Name of mutex (optional)
ResultVal<bool> SyncRequest() override { ResultVal<bool> WaitSynchronization() override;
// TODO(bunnei): ImplementMe
locked = true;
return MakeResult<bool>(false);
}
ResultVal<bool> WaitSynchronization() override {
// TODO(bunnei): ImplementMe
bool wait = locked;
if (locked) {
Kernel::WaitCurrentThread(WAITTYPE_MUTEX, GetHandle());
}
return MakeResult<bool>(wait);
}
}; };
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
@ -49,21 +35,46 @@ public:
typedef std::multimap<Handle, Handle> MutexMap; typedef std::multimap<Handle, Handle> MutexMap;
static MutexMap g_mutex_held_locks; static MutexMap g_mutex_held_locks;
void MutexAcquireLock(Mutex* mutex, Handle thread) { /**
* Acquires the specified mutex for the specified thread
* @param mutex Mutex that is to be acquired
* @param thread Thread that will acquired
*/
void MutexAcquireLock(Mutex* mutex, Handle thread = GetCurrentThreadHandle()) {
g_mutex_held_locks.insert(std::make_pair(thread, mutex->GetHandle())); g_mutex_held_locks.insert(std::make_pair(thread, mutex->GetHandle()));
mutex->lock_thread = thread; mutex->lock_thread = thread;
} }
void MutexAcquireLock(Mutex* mutex) { bool ReleaseMutexForThread(Mutex* mutex, Handle thread) {
Handle thread = GetCurrentThreadHandle();
MutexAcquireLock(mutex, thread); MutexAcquireLock(mutex, thread);
Kernel::ResumeThreadFromWait(thread);
return true;
}
/**
* Resumes a thread waiting for the specified mutex
* @param mutex The mutex that some thread is waiting on
*/
void ResumeWaitingThread(Mutex* mutex) {
// Find the next waiting thread for the mutex...
if (mutex->waiting_threads.empty()) {
// Reset mutex lock thread handle, nothing is waiting
mutex->locked = false;
mutex->lock_thread = -1;
}
else {
// Resume the next waiting thread and re-lock the mutex
std::vector<Handle>::iterator iter = mutex->waiting_threads.begin();
ReleaseMutexForThread(mutex, *iter);
mutex->waiting_threads.erase(iter);
}
} }
void MutexEraseLock(Mutex* mutex) { void MutexEraseLock(Mutex* mutex) {
Handle handle = mutex->GetHandle(); Handle handle = mutex->GetHandle();
auto locked = g_mutex_held_locks.equal_range(mutex->lock_thread); auto locked = g_mutex_held_locks.equal_range(mutex->lock_thread);
for (MutexMap::iterator iter = locked.first; iter != locked.second; ++iter) { for (MutexMap::iterator iter = locked.first; iter != locked.second; ++iter) {
if ((*iter).second == handle) { if (iter->second == handle) {
g_mutex_held_locks.erase(iter); g_mutex_held_locks.erase(iter);
break; break;
} }
@ -71,6 +82,19 @@ void MutexEraseLock(Mutex* mutex) {
mutex->lock_thread = -1; mutex->lock_thread = -1;
} }
void ReleaseThreadMutexes(Handle thread) {
auto locked = g_mutex_held_locks.equal_range(thread);
// Release every mutex that the thread holds, and resume execution on the waiting threads
for (MutexMap::iterator iter = locked.first; iter != locked.second; ++iter) {
Mutex* mutex = g_object_pool.GetFast<Mutex>(iter->second);
ResumeWaitingThread(mutex);
}
// Erase all the locks that this thread holds
g_mutex_held_locks.erase(thread);
}
bool LockMutex(Mutex* mutex) { bool LockMutex(Mutex* mutex) {
// Mutex alread locked? // Mutex alread locked?
if (mutex->locked) { if (mutex->locked) {
@ -80,26 +104,9 @@ bool LockMutex(Mutex* mutex) {
return true; return true;
} }
bool ReleaseMutexForThread(Mutex* mutex, Handle thread) {
MutexAcquireLock(mutex, thread);
Kernel::ResumeThreadFromWait(thread);
return true;
}
bool ReleaseMutex(Mutex* mutex) { bool ReleaseMutex(Mutex* mutex) {
MutexEraseLock(mutex); MutexEraseLock(mutex);
ResumeWaitingThread(mutex);
// Find the next waiting thread for the mutex...
while (!mutex->waiting_threads.empty()) {
std::vector<Handle>::iterator iter = mutex->waiting_threads.begin();
ReleaseMutexForThread(mutex, *iter);
mutex->waiting_threads.erase(iter);
}
// Reset mutex lock thread handle, nothing is waiting
mutex->locked = false;
mutex->lock_thread = -1;
return true; return true;
} }
@ -157,4 +164,17 @@ Handle CreateMutex(bool initial_locked, const std::string& name) {
return handle; return handle;
} }
ResultVal<bool> Mutex::WaitSynchronization() {
bool wait = locked;
if (locked) {
Kernel::WaitCurrentThread(WAITTYPE_MUTEX, GetHandle());
}
else {
// Lock the mutex when the first thread accesses it
locked = true;
MutexAcquireLock(this);
}
return MakeResult<bool>(wait);
}
} // namespace } // namespace

View file

@ -24,4 +24,10 @@ ResultCode ReleaseMutex(Handle handle);
*/ */
Handle CreateMutex(bool initial_locked, const std::string& name="Unknown"); Handle CreateMutex(bool initial_locked, const std::string& name="Unknown");
/**
* Releases all the mutexes held by the specified thread
* @param thread Thread that is holding the mutexes
*/
void ReleaseThreadMutexes(Handle thread);
} // namespace } // namespace

View file

@ -14,6 +14,7 @@
#include "core/hle/hle.h" #include "core/hle/hle.h"
#include "core/hle/kernel/kernel.h" #include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/thread.h" #include "core/hle/kernel/thread.h"
#include "core/hle/kernel/mutex.h"
#include "core/hle/result.h" #include "core/hle/result.h"
#include "core/mem_map.h" #include "core/mem_map.h"
@ -164,6 +165,9 @@ ResultCode StopThread(Handle handle, const char* reason) {
Thread* thread = g_object_pool.Get<Thread>(handle); Thread* thread = g_object_pool.Get<Thread>(handle);
if (thread == nullptr) return InvalidHandle(ErrorModule::Kernel); if (thread == nullptr) return InvalidHandle(ErrorModule::Kernel);
// Release all the mutexes that this thread holds
ReleaseThreadMutexes(handle);
ChangeReadyState(thread, false); ChangeReadyState(thread, false);
thread->status = THREADSTATUS_DORMANT; thread->status = THREADSTATUS_DORMANT;
for (Handle waiting_handle : thread->waiting_threads) { for (Handle waiting_handle : thread->waiting_threads) {