private (long, KThread) MutexUnlock(KThread CurrentThread, long MutexAddress)
{
KThread NewOwnerThread = CurrentThread.RelinquishMutex(MutexAddress, out int Count);
int MutexValue = 0;
if (NewOwnerThread != null)
{
MutexValue = NewOwnerThread.ThreadHandleForUserMutex;
if (Count >= 2)
{
MutexValue |= HasListenersMask;
}
NewOwnerThread.SignaledObj = null;
NewOwnerThread.ObjSyncResult = 0;
NewOwnerThread.ReleaseAndResume();
}
long Result = 0;
if (!KernelTransfer.KernelToUserInt32(System, MutexAddress, MutexValue))
{
Result = MakeError(ErrorModule.Kernel, KernelErr.NoAccessPerm);
}
return(Result, NewOwnerThread);
}
private (long, KThread) MutexUnlock(KThread currentThread, long mutexAddress)
{
KThread newOwnerThread = currentThread.RelinquishMutex(mutexAddress, out int count);
int mutexValue = 0;
if (newOwnerThread != null)
{
mutexValue = newOwnerThread.ThreadHandleForUserMutex;
if (count >= 2)
{
mutexValue |= HasListenersMask;
}
newOwnerThread.SignaledObj = null;
newOwnerThread.ObjSyncResult = 0;
newOwnerThread.ReleaseAndResume();
}
long result = 0;
if (!KernelTransfer.KernelToUserInt32(_system, mutexAddress, mutexValue))
{
result = MakeError(ErrorModule.Kernel, KernelErr.NoAccessPerm);
}
return(result, newOwnerThread);
}
private void MutexUnlock(AMemory Memory, KThread CurrentThread, long MutexAddress)
{
KThread NewOwnerThread = CurrentThread.RelinquishMutex(MutexAddress, out int Count);
int MutexValue = 0;
if (NewOwnerThread != null)
{
MutexValue = NewOwnerThread.ThreadHandleForUserMutex;
if (Count >= 2)
{
MutexValue |= HasListenersMask;
}
NewOwnerThread.SignaledObj = null;
NewOwnerThread.ObjSyncResult = 0;
NewOwnerThread.ReleaseAndResume();
}
Memory.WriteInt32ToSharedAddr(MutexAddress, MutexValue);
}
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);
}
