DoVBLTask

DoVBLTask Execute VBL tasks in the queue for a specified slot

#include <Retrace.h> Vert. Retrace Mgr

short theSlot; slot whose tasks should be executed

returns 16-bit Error Code; 0=no error

DoVBLTask causes any VBL tasks in the queue for a specified slot to be

executed. If the specified slot is the primary video slot, the position of the

cursor will also be updated.

theSlot is the slot number of the slot whose tasks should be executed. You

can use the Slot Manager routine SGetSRsrc to index through all

the slots on a particular machine.

Returns: an Error Code indicating success or failure of the function. It will

be one of:

noErr (0) no error

slotNumErr (-360) Invalid slot number

Notes: Instead of maintaining a single verticle retrace queue, the

Vertical Retrace Manager maintains a separate queue for each video

device; associated with that queue is the rate at which the device's vertical

retrace interrupt occurs. When interrupts occur for a particular video

slot, the Vertical Retrace Manager executes any tasks in the queue for

that slot.

Referenced by (3):