WaitFlag (ULONG) - input

Wait until screen I/O can take place.

Indicates whether the process should block until the screen I/O can take place.

Value

Definition
0
Return if screen I/O not available.
1
Wait until screen I/O is available.

Status (PUCHAR) - output

Address of the lock status.

The lock status may be one of the following values:

Value

Definition
0
Lock successful.
1
Lock unsuccessful (in the case of no wait).
Status is returned only when AX = 0.
Status = 1 can be returned only when WaitFlag = 0.

VioHandle (HVIO) - input

VIO presentation-space handle.

Reserved. Must be 0.

rc (APIRET) - returns

Return code.

VioScrLock returns one of the following values:

• NO_ERROR 366
  ERROR_VIO_WAIT_FLAG
  421
  ERROR_VIO_INVALID_PARMS
  430
  ERROR_VIO_ILLEGAL_DURING_POPUP
  434
  ERROR_VIO_LOCK
  436
  ERROR_VIO_INVALID_HANDLE

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