!
@abstract Create extra threads to aid compress/decompression for this file
@param fp The file handle
@param n The number of worker threads to create
@return 0 for success, or negative if an error occurred.
@notes This function creates non-shared threads for use solely by fp.
The hts_set_thread_pool function is the recommended alternative.
! @abstract Create extra threads to aid compress/decompression for this file @param fp The file handle @param n The number of worker threads to create @return 0 for success, or negative if an error occurred. @notes This function creates non-shared threads for use solely by fp. The hts_set_thread_pool function is the recommended alternative.