/GRANULARITY=option D=/GRANULARITY=QUADWORD

 Controls the size of data that can be safely accessed from
 different threads.  You do not need to specify this option for
 local data access by a single process, unless asynchronous write
 access from outside the user process might occur.  The default is
 /GRANULARITY=QUADWORD.

 Data that can be written from multiple threads must be declared as
 VOLATILE (so it is not held in registers).  To ensure alignment in
 common blocks and derived-type and record structures, use the
 /ALIGNMENT qualifier.

 You can only specify one of the qualifier options.

 BYTE
   Ensures that all data (one byte or greater) can be accessed from
   different threads sharing data in memory.  This option will slow
   run-time performance.

 LONGWORD
   Ensures that naturally aligned data of longword size (4 bytes) or
   greater can be accessed safely from different threads sharing
   data in memory.

   When this option is in effect, attempts to access smaller size
   data or misaligned data can result in data items that are
   inconsistently updated for multiple threads.

 QUADWORD
   Ensures that naturally aligned data of quadword size (8 bytes)
   can be accessed safely from different threads sharing data in
   memory.  This is the default.

   When this option is in effect, attempts to access smaller size
   data or misaligned data can result in data items that are
   inconsistently updated for multiple threads.