OR_ATOMIC

 The OR_ATOMIC function logically ORs the value of an  expression
 to the value of a variable, stores the newly computed value, and
 returns the previous value.


 Syntax:

   OR_ATOMIC(e,v)

 The type of the expression 'e'  must  be  assignment  compatbile
 with  that  of  the  variable  'v'.   The  variable v must be an
 INTEGER, UNSIGNED, INTEGER64, or UNSIGNED64 variable and must be
 allocated  on  a  natural boundary (ie, longword for INTEGER and
 UNSIGNED and quadword for INTEGER64 and UNSIGNED64).  The result
 of OR_ATOMIC is the same type as the variable 'v'.