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====== VioSavRedrawUndo ======
This call allows one thread within a process to cancel a [[VioSavRedrawWait]] issued by another thread within the same process.
===== Syntax =====
VioSavRedrawUndo (OwnerIndic, KillIndic, VioHandle)
===== Parameters =====
* OwnerIndic ([[USHORT]]) - input: Indicates whether the thread issuing VioSavRedrawUndo wants ownership of VioSavRedrawWait to be reserved for its process.
* 0 Reserve ownership
* 1 Give up ownership.
* KillIndic ([[USHORT]]) - input: Indicates whether the thread with the outstanding VioSavRedrawWait should be returned an error code or be terminated.
* 0 Return error code
* 1 Terminate thread.
* VioHandle ([[HVIO]]) - input : Reserved word of 0s.
===== Return Code =====
rc ([[USHORT]]) - return
Return code descriptions are:
*0 NO_ERROR
*421 ERROR_VIO_INVALID_PARMS
*422 ERROR_VIO_FUNCTION_OWNED
*428 ERROR_VIO_NO_SAVE_RESTORE_THD
*430 ERROR_VIO_ILLEGAL_DURING_POPUP
*465 ERROR_VIO_DETACHED
*494 ERROR_VIO_EXTENDED_SG
===== Remarks =====
The issuing thread can reserve ownership of VioSavRedrawWait for its process or give it up. The thread whose VioSavRedrawWait was cancelled is optionally terminated. VioSavRedrawUndo may be issued only by a thread within the same process that owns VioSavRedrawWait.
===== Bindings =====
==== C ====
#define INCL_VIO
USHORT rc = VioSavRedrawUndo(OwnerIndic, KillIndic, VioHandle);
USHORT OwnerIndic; /* Ownership indicator */
USHORT KillIndic; /* Terminate indicator */
HVIO VioHandle; /* Video handle */
USHORT rc; /* return code */
==== MASM ====
EXTRN VioSavRedrawUndo:FAR
INCL_VIO EQU 1
PUSH WORD OwnerIndic ;Ownership indicator
PUSH WORD KillIndic ;Terminate indicator
PUSH WORD VioHandle ;Video handle
CALL VioSavRedrawUndo
Returns WORD
Text based on [[http://www.edm2.com/index.php/VioSavRedrawUndo_(OS/2_1.x)]]
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