vType

QElem structure

#include <OSUtils.h>

typedef struct QElem { Size Offset Description

QElemPtr qLink; 4 0 Address of next element in the queue

(0=last)

short qType; 2 4 Type of data:

0 = special meaning in DrvQEl (dummyType)

1 = vType (vertical retrace task) VBLTask

2 = ioQType (I/O request queue) ParamBlockRec

3 = drvType (drive queue) DrvQEl

4 = evType (event queue) EvQEl

5 = fsQType (volume control block) VCB

7 = dtQType (desktop param block) DTPBRec

char qData[1]; n 6 Data starts here, length varies

} QElem ; 6+n

typedef QElem *QElemPtr;

Notes: For queues created and maintained by an application, use any code you like

for the qType field. See En queue and De queue. System- defined queue

elements use various structures, depending upon qType, as indicated above.

All standard Operating System queues have a QHdr structure which

contains a pointer to the first queue element. Each element points to the

next, and the final element has a qLink value of 0.