Do you draw flowcharts Post: 302492216

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The Lounge What is on Your Mind? Do you draw flowcharts Post 302492216 by methyl on Sunday 30th of January 2011 01:02:31 PM

01-30-2011

Registered User

Though I was taught from "day one" to use detailed Program Flowcharts and Decision Tables, in hindsight this was really just a teaching aid.

Btw. The only time I ever used Decision Tables in earnest was when programming in RPG.

I have use Program Flowcharts in earnest.

Once you can visualise a whole program module-by-module in your head you are a programmer and are unlikely to need detailed Program Flowcharts to produce working code. However a simple "main route" Flowchart should be documented as part of the program specification and maintained with the filed program documentation. This should include an introductary overview of the function of the program and the function of each main module without going into fine detail. This documentation should be verified by the System Analyst and a Senior Programmer before the program is allowed to "go live".
I you ever work on a site long-term this sort of documentation could save your life. Everybody expects you to remember every line of code you wrote in every program. For a while this is easy but once you reach the 100,000 lines mark you won't even remember the name of the System.

I have made much use of overview Flow Diagrams at a System and Network design level to show visually how the individual components fit together. I cannot stress how important Flow Diagrams are in a large scale commercial environment where is is quite possible to get a cold call to a fault where there is nobody to ask.

Footnote: Yes, I have spent two months retro-documenting a dubiously designed and sparsely documented System ready for the next (inevitable) obscure failure. Try to avoid this sort of situation folks!

methyl

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LEARN ABOUT LINUX

__ppc_set_ppr_med_high

__PPC_SET_PPR_MED(3)					     LinuxProgrammer's Manual					      __PPC_SET_PPR_MED(3)

NAME

       __ppc_set_ppr_med, __ppc_set_ppr_very_low, __ppc_set_ppr_low, __ppc_set_ppr_med_low, __ppc_set_ppr_med_high - Set the Program Priority Reg-
       ister

SYNOPSIS

       #include <sys/platform/ppc.h>

       void __ppc_set_ppr_med(void);
       void __ppc_set_ppr_very_low(void);
       void __ppc_set_ppr_low(void);
       void __ppc_set_ppr_med_low(void);
       void __ppc_set_ppr_med_high(void);

DESCRIPTION

       These functions provide access to the Program Priority Register (PPR) on the Power architecture.

       The PPR is a 64-bit register that controls the program's priority.  By adjusting the PPR value the programmer may improve system throughput
       by  causing  system resources to be used more efficiently, especially in contention situations.	The available unprivileged states are cov-
       ered by the following functions:

       *  __ppc_set_ppr_med() sets the Program Priority Register value to medium (default).

       *  __ppc_set_ppr_very_low() sets the Program Priority Register value to very low.

       *  __ppc_set_ppr_low() sets the Program Priority Register value to low.

       *  __ppc_set_ppr_med_low() sets the Program Priority Register value to medium low.

       The privileged state medium high may also be set during certain time intervals by problem-state (unprivileged) programs, with the following
       function:

       *  __ppc_set_ppr_med_high() sets the Program Priority to medium high.

       If  the	program priority is medium high when the time interval expires or if an attempt is made to set the priority to medium high when it
       is not allowed, the priority is set to medium.

VERSIONS

       The functions __ppc_set_ppr_med(), __ppc_set_ppr_low() and __ppc_set_ppr_med_low() are provided by glibc since version 2.18.  The functions
       __ppc_set_ppr_very_low() and __ppc_set_ppr_med_high() first appeared in glibc in version 2.23.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +---------------------------+---------------+---------+
       |Interface		   | Attribute	   | Value   |
       +---------------------------+---------------+---------+
       |__ppc_set_ppr_med(),	   | Thread safety | MT-Safe |
       |__ppc_set_ppr_very_low(),  |		   |	     |
       |__ppc_set_ppr_low(),	   |		   |	     |
       |__ppc_set_ppr_med_low(),   |		   |	     |
       |__ppc_set_ppr_med_high()   |		   |	     |
       +---------------------------+---------------+---------+
CONFORMING TO

       These functions are nonstandard GNU extensions.

NOTES

       The  functions  __ppc_set_ppr_very_low()  and  __ppc_set_ppr_med_high()	will  be defined by <sys/platform/ppc.h> if _ARCH_PWR8 is defined.
       Availability of these functions can be tested using #ifdef _ARCH_PWR8.

SEE ALSO

       __ppc_yield(3)

       Power ISA, Book II - Section 3.1 (Program Priority Registers)

GNU C Library							    2017-09-15						      __PPC_SET_PPR_MED(3)