STREAMS/UX for the HP 9000 Reference Manual

STREAMS/UX Multiprocessor Support

Writing MP Scalable Modules and Drivers

No matter which utility is used to pass messages across the mux, you must make

sure that the queues passed to the utilities are still allocated. You may also want

to check that the driver is still linked under the mux.

• Follow the design guidelines in the SVR4.2 STREAMS manual. The guidelines

are located at the end of these chapters: Overview of STREAMS Modules and

Drivers, STREAMS Modules, STREAMS Drivers, and STREAMS

Multiplexing. For STREAMS/UX, you do not need to follow some of these

guidelines. However, if you ignore them, your software will not be portable to

SVR4 STREAMS. For HP-UX STREAMS, you do not need to call qprocson or

qprocsoff as you do for SVR4 MP STREAMS. Also, you can use synchronization

levels to protect module and driver private structures instead of SVR4 MP locks

and synchronization primitives. Lastly, you do not need to use SVR4 MP

canputnext and bcanputnext instead of canput and bcanput on STREAMS/UX.