There are two types of RIN available for your use:
Global RIN, used to manage a resource shared by processes
located in different jobs/sessions.
Local RIN, used to manage a resource shared by processes
located in the same job/session.
If you have standard user capabilities you can lock more than one
local RIN at the same time. However, you can lock only one global
RIN at a time, because of the danger of a system deadlock
resulting from the improper use of global RINs. Refer to the
discussion of deadlock found later in this chapter.
If your program needs to have two or more global RINs locked
at the same time, you must have
the Multiple RIN (MR) capability assigned by a System Manager or Account
Manager to the group in which your program file resides. In addition,
you must assign to your program file the MR capability-class attribute at
link time using the ;CAP= parameter of the :LINK command.
Because the operating system uses a resource management scheme similar to
global RINs in the FLOCK and FUNLOCK intrinsics,
you must count each active FLOCK call in your program as a
locked global RIN.
