thread is currently only used to poll for CDROM devices and is not useful
when "nocdrom" is set. This change also fixes the problem of the emulator
preventing the CD to be ejected at the host level despite "nocdrom" being
set in prefs.
Thanks to Robert Munafo <mrob27@gmail.com> for investigating this problem!
Previously, SheepShaver would usually hang if it was unable to access the ROM
file on startup, due to a race between media_poll_func() and DarwinSysExit().
This change eliminates the race by ensuring that media_poll_func() always ends
up waiting in CFRunLoopRun(), which allows us to terminate the polling thread
in a consistent way.
Other bugs fixed:
- CD-ROM media are polled and now can be changed without rebooting
- Buffer overflow, memory leak and extra wait in CD-ROM ejection code