HP 3000 Manuals HP 3000 Manuals
Multiple RIN (MR) Capability
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.