Allows one thread within a process to cancel a VioModeWait issued by another thread within the same process.
#define INCL_VIO #include <os2.h> ULONG OwnerIndic; /* Ownership indicator. */ ULONG KillIndic; /* Terminate indicator */ ULONG Reserved; /* Reserved. Must be 0. */ APIRET rc; /* Return code. */ rc = VioModeUndo(OwnerIndic, KillIndic, Reserved);