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There is no guaranteed sequencing of threads when the lock is released.It can be placed in shared memory shared between processes.Therefore, it should not be used to lock a region for any significant length of time.All waiting threads are in a tight loop spinning on the lock.Note that if a flag has been made obsolete, the documentation must state "This flag is now obsolete, as of ".That way, we know we can ignore its existence, instead of wondering why it is not documented and whether or not we should be writing it out.
It turns out it is the AVIIF_TWOCC flag which appears in the header file but is not documented.Does not state if the Slim Reader/Writer lock can be placed in shared memory (shared segment DLL, shared segment executable, or memory-mapped file) and shared across process boundaries.Does not state if there is any guaranteed sequencing, or that shared access can indefinitely starve exclusive requests, or what.The documentation for AVISTREAMHEADER appears to be missing from the VS2008 documentation. For example, the AVISTREAMHEADER structure is 64 bytes long.The 'strh' data structure is said by the (non-VS2008) AVI documentation as having its data element "consists of of an AVISTREAMHEADER structure" But this is not correct. The cb field is specified as counting the number of bytes not including the 'strh' (FOURCC fcc) and length (DWORD cb) fields, which is consistent with the layout of the RIFF chunk.