public long ArbitrateLock(
Process Process,
AMemory Memory,
int OwnerHandle,
long MutexAddress,
int RequesterHandle)
{
System.CriticalSectionLock.Lock();
KThread CurrentThread = System.Scheduler.GetCurrentThread();
CurrentThread.SignaledObj = null;
CurrentThread.ObjSyncResult = 0;
if (!UserToKernelInt32(Memory, MutexAddress, out int MutexValue))
{
System.CriticalSectionLock.Unlock();
return(MakeError(ErrorModule.Kernel, KernelErr.NoAccessPerm));;
}
if (MutexValue != (OwnerHandle | HasListenersMask))
{
System.CriticalSectionLock.Unlock();
return(0);
}
KThread MutexOwner = Process.HandleTable.GetObject <KThread>(OwnerHandle);
if (MutexOwner == null)
{
System.CriticalSectionLock.Unlock();
return(MakeError(ErrorModule.Kernel, KernelErr.InvalidHandle));
}
CurrentThread.MutexAddress = MutexAddress;
CurrentThread.ThreadHandleForUserMutex = RequesterHandle;
MutexOwner.AddMutexWaiter(CurrentThread);
CurrentThread.Reschedule(ThreadSchedState.Paused);
System.CriticalSectionLock.Unlock();
System.CriticalSectionLock.Lock();
if (CurrentThread.MutexOwner != null)
{
CurrentThread.MutexOwner.RemoveMutexWaiter(CurrentThread);
}
System.CriticalSectionLock.Unlock();
return((uint)CurrentThread.ObjSyncResult);
}
public long ArbitrateLock(int ownerHandle, long mutexAddress, int requesterHandle)
{
KThread currentThread = _system.Scheduler.GetCurrentThread();
_system.CriticalSection.Enter();
currentThread.SignaledObj = null;
currentThread.ObjSyncResult = 0;
KProcess currentProcess = _system.Scheduler.GetCurrentProcess();
if (!KernelTransfer.UserToKernelInt32(_system, mutexAddress, out int mutexValue))
{
_system.CriticalSection.Leave();
return(MakeError(ErrorModule.Kernel, KernelErr.NoAccessPerm));
}
if (mutexValue != (ownerHandle | HasListenersMask))
{
_system.CriticalSection.Leave();
return(0);
}
KThread mutexOwner = currentProcess.HandleTable.GetObject <KThread>(ownerHandle);
if (mutexOwner == null)
{
_system.CriticalSection.Leave();
return(MakeError(ErrorModule.Kernel, KernelErr.InvalidHandle));
}
currentThread.MutexAddress = mutexAddress;
currentThread.ThreadHandleForUserMutex = requesterHandle;
mutexOwner.AddMutexWaiter(currentThread);
currentThread.Reschedule(ThreadSchedState.Paused);
_system.CriticalSection.Leave();
_system.CriticalSection.Enter();
if (currentThread.MutexOwner != null)
{
currentThread.MutexOwner.RemoveMutexWaiter(currentThread);
}
_system.CriticalSection.Leave();
return((uint)currentThread.ObjSyncResult);
}
private KThread TryAcquireMutex(KThread Requester)
{
long Address = Requester.MutexAddress;
KProcess CurrentProcess = System.Scheduler.GetCurrentProcess();
CurrentProcess.CpuMemory.SetExclusive(0, Address);
if (!KernelTransfer.UserToKernelInt32(System, Address, out int MutexValue))
{
//Invalid address.
CurrentProcess.CpuMemory.ClearExclusive(0);
Requester.SignaledObj = null;
Requester.ObjSyncResult = (int)MakeError(ErrorModule.Kernel, KernelErr.NoAccessPerm);
return(null);
}
while (true)
{
if (CurrentProcess.CpuMemory.TestExclusive(0, Address))
{
if (MutexValue != 0)
{
//Update value to indicate there is a mutex waiter now.
CurrentProcess.CpuMemory.WriteInt32(Address, MutexValue | HasListenersMask);
}
else
{
//No thread owning the mutex, assign to requesting thread.
CurrentProcess.CpuMemory.WriteInt32(Address, Requester.ThreadHandleForUserMutex);
}
CurrentProcess.CpuMemory.ClearExclusiveForStore(0);
break;
}
CurrentProcess.CpuMemory.SetExclusive(0, Address);
MutexValue = CurrentProcess.CpuMemory.ReadInt32(Address);
}
if (MutexValue == 0)
{
//We now own the mutex.
Requester.SignaledObj = null;
Requester.ObjSyncResult = 0;
Requester.ReleaseAndResume();
return(null);
}
MutexValue &= ~HasListenersMask;
KThread MutexOwner = CurrentProcess.HandleTable.GetObject <KThread>(MutexValue);
if (MutexOwner != null)
{
//Mutex already belongs to another thread, wait for it.
MutexOwner.AddMutexWaiter(Requester);
}
else
{
//Invalid mutex owner.
Requester.SignaledObj = null;
Requester.ObjSyncResult = (int)MakeError(ErrorModule.Kernel, KernelErr.InvalidHandle);
Requester.ReleaseAndResume();
}
return(MutexOwner);
}
private KThread TryAcquireMutex(Process Process, AMemory Memory, KThread Requester)
{
int Core = Requester.CurrentCore;
long Address = Requester.MutexAddress;
Memory.SetExclusive(Core, Address);
int MutexValue = Memory.ReadInt32(Address);
while (MutexValue != 0)
{
if (Memory.TestExclusive(Core, Address))
{
if (MutexValue != 0)
{
//Update value to indicate there is a mutex waiter now.
Memory.WriteInt32(Address, MutexValue | HasListenersMask);
}
else
{
//No thread owning the mutex, assign to requesting thread.
Memory.WriteInt32(Address, Requester.ThreadHandleForUserMutex);
}
Memory.ClearExclusiveForStore(Core);
break;
}
Memory.SetExclusive(Core, Address);
MutexValue = Memory.ReadInt32(Address);
}
if (MutexValue == 0)
{
//We now own the mutex.
Requester.SignaledObj = null;
Requester.ObjSyncResult = 0;
Requester.ReleaseAndResume();
return(null);
}
MutexValue &= ~HasListenersMask;
KThread MutexOwner = Process.HandleTable.GetData <KThread>(MutexValue);
if (MutexOwner != null)
{
//Mutex already belongs to another thread, wait for it.
MutexOwner.AddMutexWaiter(Requester);
}
else
{
//Invalid mutex owner.
Requester.SignaledObj = null;
Requester.ObjSyncResult = (int)MakeError(ErrorModule.Kernel, KernelErr.InvalidHandle);
Requester.ReleaseAndResume();
}
return(MutexOwner);
}