remove the STOP when LOCBIN_IO_THREAD_SAFE is undefined and multi-threaded:  uses shared buffer IO to store data from all threads and then let  master-thread write nThreads tiles.
remove the STOP when LOCBIN_IO_THREAD_SAFE is undefined and multi-threaded:
 uses shared buffer IO to store data from all threads and then let
 master-thread write nThreads tiles.

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