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Avoid copying more handles than we have space for (#4564)

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* Avoid copying more handles than we have space for

* Use locks instead

* Reduce nesting by combining the lock statements

* Add locks for other uses of _sessionHandles and _portHandles

* Use one object to lock instead of locking twice

* Release the lock as soon as possible
This commit is contained in:
TSRBerry 2023-03-19 11:30:04 +01:00 committed by GitHub
parent b2623dc27d
commit c05c688ee8
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1 changed files with 28 additions and 9 deletions
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35
Ryujinx.HLE/HOS/Services/ServerBase.cs
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@ -32,6 +32,8 @@ namespace Ryujinx.HLE.HOS.Services
0x01007FFF
};
private readonly object _handleLock = new();
private readonly KernelContext _context;
private KProcess _selfProcess;
@ -77,7 +79,10 @@ namespace Ryujinx.HLE.HOS.Services
private void AddPort(int serverPortHandle, Func<IpcService> objectFactory)
{
_portHandles.Add(serverPortHandle);
lock (_handleLock)
{
_portHandles.Add(serverPortHandle);
}
_ports.Add(serverPortHandle, objectFactory);
}
@ -92,7 +97,10 @@ namespace Ryujinx.HLE.HOS.Services
public void AddSessionObj(int serverSessionHandle, IpcService obj)
{
_sessionHandles.Add(serverSessionHandle);
lock (_handleLock)
{
_sessionHandles.Add(serverSessionHandle);
}
_sessions.Add(serverSessionHandle, obj);
}
@ -126,12 +134,20 @@ namespace Ryujinx.HLE.HOS.Services
while (true)
{
int handleCount = _portHandles.Count + _sessionHandles.Count;
int handleCount;
int portHandleCount;
int[] handles;
int[] handles = ArrayPool<int>.Shared.Rent(handleCount);
lock (_handleLock)
{
portHandleCount = _portHandles.Count;
handleCount = portHandleCount + _sessionHandles.Count;
_portHandles.CopyTo(handles, 0);
_sessionHandles.CopyTo(handles, _portHandles.Count);
handles = ArrayPool<int>.Shared.Rent(handleCount);
_portHandles.CopyTo(handles, 0);
_sessionHandles.CopyTo(handles, portHandleCount);
}
// We still need a timeout here to allow the service to pick up and listen new sessions...
var rc = _context.Syscall.ReplyAndReceive(out int signaledIndex, handles.AsSpan(0, handleCount), replyTargetHandle, 1000000L);
@ -145,7 +161,7 @@ namespace Ryujinx.HLE.HOS.Services
replyTargetHandle = 0;
if (rc == Result.Success && signaledIndex >= _portHandles.Count)
if (rc == Result.Success && signaledIndex >= portHandleCount)
{
// We got a IPC request, process it, pass to the appropriate service if needed.
int signaledHandle = handles[signaledIndex];
@ -278,7 +294,10 @@ namespace Ryujinx.HLE.HOS.Services
else if (request.Type == IpcMessageType.HipcCloseSession || request.Type == IpcMessageType.TipcCloseSession)
{
_context.Syscall.CloseHandle(serverSessionHandle);
_sessionHandles.Remove(serverSessionHandle);
lock (_handleLock)
{
_sessionHandles.Remove(serverSessionHandle);
}
IpcService service = _sessions[serverSessionHandle];
(service as IDisposable)?.Dispose();
_sessions.Remove(serverSessionHandle);