{
{  The purpose of this request is to exit the current task.  The PTL
{  entry for the task is deleted and the parent task is notified of
{  callee termination.
{
{  TYPE
{    TMT$RB_TASK_EXIT = RECORD
{      REQCODE,
{      STATUS,
{      PARENT_GLOBAL_TASK_ID,
{      SIGNAL,
{    RECEND;
{
{  REQCODE: (input) The value for this parameter is SYC$RC_TASK_EXIT.
{
{  STATUS: (output) This parameter specifies standard monitor status.
{
{  PARENT_GLOBAL_TASK_ID: (input) This parameter specifies the global task id
{      of the parent task.
{
{  SIGNAL: (input) This parameter specifies the signal block to be sent to
{      the parent task.
