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0c8731b8f4
* fhandler.cc (fhandler_base::open): Make tape I/O asynchronous. * fhandler.h (class fhandler_dev_tape): Add mt_evt member. * fhandler_tape.cc (mtinfo_drive::initialize): Initialize async_writes. (mtinfo_drive::close): Handle async writes. (mtinfo_drive::read): Add mt_evt parameter. Use overlapped I/O. (mtinfo_drive::async_wait): New function. (mtinfo_drive::write): Add mt_evt parameter. Use overlapped I/O. Handle async writes. (mtinfo_drive::_set_pos): Handle async writes. (mtinfo_drive::set_partition): Ditto. (mtinfo_drive::prepare): Ditto. (mtinfo_drive::get_status): Drop useless "else". Handle async_writes flag. (mtinfo_drive::set_options): Handle async_writes flags. (fhandler_dev_tape::close): Close mt_evt handle. (fhandler_dev_tape::raw_read): Create mt_evt handle and use in call to mtinfo_drive::read. (fhandler_dev_tape::raw_write): Create mt_evt handle and use in call to mtinfo_drive::write. * mtinfo.h (MTINFO_VERSION): Bump. (enum dirty_state): Add async_write_pending state. (class mtinfo_drive): Add OVERLAPPED struct "ov". Add async_writes flag. (mtinfo_drive::async_wait): Add declaration. (mtinfo_drive::read): Add mt_evt parameter. (mtinfo_drive::write): Ditto. * registry.cc (load_registry_hive): Call enable_restore_privilege instead of set_process_privilege.