Inside Macintosh: Apple Game Sprockets Guide /

Chapter 2 - DrawSprocket / DrawSprocket Reference

DrawSprocket Functions / Drawing and Double Buffering

DSpContext_IsBusy

You can use the DSpContext_IsBusy function to find out whether a back buffer is available.

OSStatus DSpContext_IsBusy (
DSpContextReference inContext,
Boolean *outBusyFlag);

inContext

A reference to the context for which you want to determine if a back buffer is available.

outBusyFlag

On exit, contains true if no back buffer is available, false if a back buffer is available.

function result

A result code.

DESCRIPTION

The DSpContext_IsBusy function returns true in the outBusyFlag flag if there are no back buffers available for the context specified in the inContext parameter. This is useful if you would like to know if a call to DSpContext_GetBackBuffer will block.

CALLING RESTRICTIONS

Do not call this function during an interrupt.