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The CIN on the block diagram is orange if you have not set the node to be thread safe. A thread safe node is yellow. Complete the following steps to make LabVIEW recognize a CIN node as thread safe.

1. Add the CINProperties function to your CIN code in the prototypes section of your .c source file, as shown in the following example code:
   
   CIN MgErr CINProperties(int32 prop, void *data);
2. Add the following function statement to the functions section of your .c source file:
   
   CIN MgErr CINProperties(int32 prop, void *data)

{

switch (prop) {

case kCINIsReentrant:

*(Bool32 *)data = TRUE;

return noErr;

}

return mgNotSupported;

}