Path: utzoo!utgpu!attcan!uunet!lll-winken!lll-ncis!helios.ee.lbl.gov!pasteur!ucbvax!POSTGRES.BERKELEY.EDU!dillon
From: dillon@POSTGRES.BERKELEY.EDU (Matt Dillon)
Newsgroups: comp.sys.amiga.tech
Subject: BUG IN AUDIO.DEVICE
Message-ID: <8901070159.AA04046@postgres.Berkeley.EDU>
Date: 7 Jan 89 01:59:49 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 19

audio.device and incorrectly attributed it to WaitIO().

	The problem is that the audio.device does NOT ALWAYS USE ReplyMsg()
to return requests!  This means that the ln_Type field of the request will
not be set to NT_REPLYMSG.  WaitIO() depends on this to work!

	Thus, for the audio device, Under no circumstances are you to
use WaitIO()!  Instead, use WaitPort()/GetMsg() to get the request from
the message port when it is returned.

	I have found that with heavy use of CMD_WRITE's about 2-5% of the
requests are returned in this manner (i.e. improperly).

	Also, many people forget to set the ln_Type field of *any* IO
request to NT_MESSAGE before calling DoIO()/SendIO()/BeginIO().  In the
case of the audio.device it doesn't matter anyway since the audio.device's
returning of requests is broken.

				-Matt