Static kVTPixelTransferPropertyKey_RealTime 

pub unsafe static kVTPixelTransferPropertyKey_RealTime: &'static CFString

Available on crate feature VTPixelTransferProperties only.

Hints the transfer session that the operation is, or is not, being performed in real time.

Set this property to kCFBooleanTrue to indicate that the transfer is part of realtime operation. If set to true, the VTPixelTransferSession may be given precedence over non-realtime tasks. This can be set to false for transfers being performed as part of background operations. By default this value is NULL indicating that it is unspecified.

See also Apple’s documentation