Implementation considerations

• Only the AF_INET address family must be supported. That is, the DSOM, Replication, and Event Manager frameworks all use Internet addresses and port numbers to refer to specific sockets.

• On OS/2, the SOMobjects run-time libraries were built using the C Set/2 32-bit compiler. If the underlying subclass implementation uses a 16-bit subroutine library, conversion of the method call arguments may be required. (This mapping of arguments is often referred to as "thunking.")

• Sockets subclasses to be used in multi-threaded environments should be made thread-safe. That is, it is possible that concurrent threads may make calls on the (single) Sockets object, so data structures must be protected within critical regions, as appropriate.

• Valid values for the serrno attribute are defined in the file soms.h. The subclass implementation should map local error numbers into the appropriate corresponding Sockets error numbers.