Schedule an interrupt upon IO completion

[Steam Ranger]

I'm making an app where it needs to play audio and display graphics, near-constantly, at the same time.

The graphics just need their

MainLoop()

function to be called often enough and they'll work, the audio is double buffered so it only needs action once the audio is complete, but that action needs to be near instant.

How do I schedule an interrupt to occur once the audio's IO request completes?

[Niklas]

Originally Posted by Steam Ranger

I'm making an app where it needs to play audio and display graphics, near-constantly, at the same time.

The graphics just need their

MainLoop()

function to be called often enough and they'll work, the audio is double buffered so it only needs action once the audio is complete, but that action needs to be near instant.

How do I schedule an interrupt to occur once the audio's IO request completes?

audio.device will do ReplyMsg() on the IOAudio request once audio.device is done playing that request's data. You can configure your reply port so that it either 1. sets a signal for your task (using PA_SIGNAL) and then use a regular Wait() event loop, or 2. triggers a soft interrupt (using PA_SOFTINT).

If you use CreatePort() to create the reply port then it will allocate a task signal and set PA_SIGNAL for you (https://github.com/noname22/NeoDICE/...b/createport.c). If you want to use PA_SOFTINT instead I think you will have to create the reply port yourself.

[Thomas Richter]

Maybe to clarify this a bit: An audio IOrequest completes once the audio device could successfully load your request into the hardware. That is, it completes when the sample you requested starts playing - not when it ends playing it. Otherwise, what Niklas said is correct of course. Signals are usually easier to handle than the interrupt business.