HP 3000 Manuals HP 3000 Manuals
Overview of MPE XL and MPE V/E Differences Processes are the basic executable entities in MPE. You can use various intrinsics and commands to create, activate, suspend, interrogate, and delete processes, and to enable communication between them. Process management intrinsics in MPE XL have been modified to deal effectively with both the CM and the NM programming environments. The Process Handling (PH) and Programmatic Sessions (PS) capability-class attributes function the same way in MPE XL as in MPE V/E. Two architectural differences between MPE V/E and MPE XL are in the system control of stacks and the incompatibility between NM and CM plabels. Internal differences in file structure do not impact the operation of IPC (interprocess communication). The function of JCWs (Job Control Words) in MPE V/E is expanded on MPE XL by the addition of variables, which are managed with several new intrinsics and commands. New MPE XL features that are not available on MPE V/E include: * The following intrinsics: HPCIGETVAR HPCIPUTVAR HPCIDELETEVAR HPFOPEN * The following commands: SETVAR SHOWVAR DELETEVAR Changed Existing MPE V/E features that have been modified on MPE XL include: * Data Stack * The following intrinsics: FCONTROL CREATE CREATEPROCESS STARTSESS Unchanged Existing MPE V/E features that are the same on MPE XL include: * The following intrinsics: ABORTSESS ACTIVATE CAUSEBREAK FATHER FCLOSE FINDJCW FINSTATE FINTEXIT FOPEN FREAD FWRITE GETINFO GETJCW GETPRIORITY GETPROCID GETPROCINFO PAUSE PROCINFO PROCTIME PUTJCW QUIT QUITPROG RECEIVEMAIL SENDMAIL SETJCW SUSPEND TERMINATE * The following commands: SETJCW SHOWJCW