| 1234567891011121314151617181920212223242526272829303132 |
- acd is composed of four procs
- wineventproc (win.c:/^wineventproc)
- reads acme window events, sends them along w->cevent.
- cdstatusproc (mmc.c:/^cdstatusproc)
- reads cd status once per second, sending
- status updates to d->cstatus.
- detects disk changes, sends new tocs to d->ctocdisp.
- cddbproc (cddb.c:/^cddbproc)
- reads tocs from d->cdbreq, if it finds
- translations in the cddb, sends new tocs to d->cdbreply.
- eventwatcher (main.c:/^eventwatcher)
- the main event loop.
- reads status from d->cstatus.
- reads events from w->cevent.
- reads new tocs to display from d->ctocdisp.
- sends new tocs to translate to d->cdbreq.
- reads new translated tocs from d->cdbreply.
- an interesting bug in the original design:
- both cdstatusproc and the eventwatcher proc
- issue scsi commands. (the eventwatcher responds to
- things such as Play, Stop, etc., as well as advancing the track.)
- the sd(3) driver did not expect overlapped commands,
- and crashed.
- this has been fixed by making the scsi(2) commands threadsafe,
- and making the sd(3) driver more robust.
|
