Where is PCB on Linux Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern) 2019 Community Moderator Election Results Why I closed the “Why is Kali so hard” questionSave entire process for continuation after rebootHow does copy-on-write in fork() handle multiple fork?/usr/bin/random using a lot of CPUProcess scheduling data on linuxWhat is the relationship between the stack and the process table?Is a light weight process attached to a kernel thread in Linux?is `write()` asynchronous write?What kinds of files can be dynamically loaded?understanding how threads are created inside linux operating systemLegitimate reasons for a program to intercept, internally handle and ignore SIGINT signal

What causes the direction of lightning flashes?

What does "lightly crushed" mean for cardamon pods?

Using et al. for a last / senior author rather than for a first author

Why aren't air breathing engines used as small first stages

Do I really need to have a message in a novel to appeal to readers?

Why are the trig functions versine, haversine, exsecant, etc, rarely used in modern mathematics?

Can a party unilaterally change candidates in preparation for a General election?

Why are there no cargo aircraft with "flying wing" design?

8 Prisoners wearing hats

If my PI received research grants from a company to be able to pay my postdoc salary, did I have a potential conflict interest too?

What is homebrew?

Is it ethical to give a final exam after the professor has quit before teaching the remaining chapters of the course?

Dating a Former Employee

Denied boarding although I have proper visa and documentation. To whom should I make a complaint?

Generate an RGB colour grid

Should I use a zero-interest credit card for a large one-time purchase?

Delete nth line from bottom

Amount of permutations on an NxNxN Rubik's Cube

Can you use the Shield Master feat to shove someone before you make an attack by using a Readied action?

What do you call the main part of a joke?

How to react to hostile behavior from a senior developer?

How can I use the Python library networkx from Mathematica?

Most bit efficient text communication method?

また usage in a dictionary



Where is PCB on Linux



Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
2019 Community Moderator Election Results
Why I closed the “Why is Kali so hard” questionSave entire process for continuation after rebootHow does copy-on-write in fork() handle multiple fork?/usr/bin/random using a lot of CPUProcess scheduling data on linuxWhat is the relationship between the stack and the process table?Is a light weight process attached to a kernel thread in Linux?is `write()` asynchronous write?What kinds of files can be dynamically loaded?understanding how threads are created inside linux operating systemLegitimate reasons for a program to intercept, internally handle and ignore SIGINT signal



.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








9















A PCB is a process control block , this is its definition on Wikipedia




Process Control Block (PCB, also called Task Controlling Block,[1]
Task Struct, or Switchframe) is a data structure in the operating
system kernel containing the information needed to manage a particular
process. The PCB is "the manifestation of a process in an operating
system




and its duty is :



Process identification data
Processor state data
Process control data


So where is the PCB of a process to be found?






linux process cpu







share|improve this question
























  • Also see Process control block in Linux on Stack Overflow.

    – jww
    11 hours ago

















9















A PCB is a process control block , this is its definition on Wikipedia




Process Control Block (PCB, also called Task Controlling Block,[1]
Task Struct, or Switchframe) is a data structure in the operating
system kernel containing the information needed to manage a particular
process. The PCB is "the manifestation of a process in an operating
system




and its duty is :



Process identification data
Processor state data
Process control data


So where is the PCB of a process to be found?






linux process cpu







share|improve this question
























  • Also see Process control block in Linux on Stack Overflow.

    – jww
    11 hours ago













9












9








9


4






A PCB is a process control block , this is its definition on Wikipedia




Process Control Block (PCB, also called Task Controlling Block,[1]
Task Struct, or Switchframe) is a data structure in the operating
system kernel containing the information needed to manage a particular
process. The PCB is "the manifestation of a process in an operating
system




and its duty is :



Process identification data
Processor state data
Process control data


So where is the PCB of a process to be found?






linux process cpu







share|improve this question
















A PCB is a process control block , this is its definition on Wikipedia




Process Control Block (PCB, also called Task Controlling Block,[1]
Task Struct, or Switchframe) is a data structure in the operating
system kernel containing the information needed to manage a particular
process. The PCB is "the manifestation of a process in an operating
system




and its duty is :



Process identification data
Processor state data
Process control data


So where is the PCB of a process to be found?






linux process cpu




linux process cpu






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 10 hours ago









jww

1,64632668




1,64632668










asked Aug 18 '14 at 6:26









Mohammad Reza RezwaniMohammad Reza Rezwani

370248




370248












  • Also see Process control block in Linux on Stack Overflow.

    – jww
    11 hours ago

















  • Also see Process control block in Linux on Stack Overflow.

    – jww
    11 hours ago
















Also see Process control block in Linux on Stack Overflow.

– jww
11 hours ago





Also see Process control block in Linux on Stack Overflow.

– jww
11 hours ago










1 Answer
1






active

oldest

votes


















12














In the Linux kernel, each process is represented by a task_struct in a doubly-linked list, the head of which is init_task (pid 0, not pid 1). This is commonly known as the process table.



In user mode, the process table is visible to normal users under /proc. Taking the headings for your question:



  • Process identification data is the process ID (which is in the path /proc/<process-id>/...), the command line (cmd), and possibly other attributes depending on your definition of 'identification'.


  • Process state data includes scheduling data (sched, stat and schedstat), what the process is currently waiting on (wchan), its environment (environ) etc.


  • Process control data could be said to be its credentials (uid_map) and resource limits (limits).


So it all depends how you define your terms... but in general, all data about a process can be found in /proc.






share|improve this answer























  • "the head of which is init_task (pid 0, not pid 1)" There's no such thing as init_task. It's init, and its pid is 1, not 0 (confirmed via pidof init).

    – AleksandrH
    Sep 15 '18 at 14:42






  • 1





    @AleksandrH init_task is a kernel structure and not a process. It points to the idle task which is internally represented by pid 0. init_task and init are completely different things.

    – Flup
    Sep 15 '18 at 15:39











  • And yet pid is only for processes...

    – AleksandrH
    Sep 15 '18 at 16:38











  • @AleksandrH Read init/init_task.c in the kernel source tree (github.com/torvalds/linux/blob/master/init/init_task.c).

    – Flup
    Sep 15 '18 at 16:39











Your Answer








StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "106"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);

else
createEditor();

);

function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);



);













draft saved

draft discarded


















StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f150734%2fwhere-is-pcb-on-linux%23new-answer', 'question_page');

);

Post as a guest















Required, but never shown

























1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









12














In the Linux kernel, each process is represented by a task_struct in a doubly-linked list, the head of which is init_task (pid 0, not pid 1). This is commonly known as the process table.



In user mode, the process table is visible to normal users under /proc. Taking the headings for your question:



  • Process identification data is the process ID (which is in the path /proc/<process-id>/...), the command line (cmd), and possibly other attributes depending on your definition of 'identification'.


  • Process state data includes scheduling data (sched, stat and schedstat), what the process is currently waiting on (wchan), its environment (environ) etc.


  • Process control data could be said to be its credentials (uid_map) and resource limits (limits).


So it all depends how you define your terms... but in general, all data about a process can be found in /proc.






share|improve this answer























  • "the head of which is init_task (pid 0, not pid 1)" There's no such thing as init_task. It's init, and its pid is 1, not 0 (confirmed via pidof init).

    – AleksandrH
    Sep 15 '18 at 14:42






  • 1





    @AleksandrH init_task is a kernel structure and not a process. It points to the idle task which is internally represented by pid 0. init_task and init are completely different things.

    – Flup
    Sep 15 '18 at 15:39











  • And yet pid is only for processes...

    – AleksandrH
    Sep 15 '18 at 16:38











  • @AleksandrH Read init/init_task.c in the kernel source tree (github.com/torvalds/linux/blob/master/init/init_task.c).

    – Flup
    Sep 15 '18 at 16:39















12














In the Linux kernel, each process is represented by a task_struct in a doubly-linked list, the head of which is init_task (pid 0, not pid 1). This is commonly known as the process table.



In user mode, the process table is visible to normal users under /proc. Taking the headings for your question:



  • Process identification data is the process ID (which is in the path /proc/<process-id>/...), the command line (cmd), and possibly other attributes depending on your definition of 'identification'.


  • Process state data includes scheduling data (sched, stat and schedstat), what the process is currently waiting on (wchan), its environment (environ) etc.


  • Process control data could be said to be its credentials (uid_map) and resource limits (limits).


So it all depends how you define your terms... but in general, all data about a process can be found in /proc.






share|improve this answer























  • "the head of which is init_task (pid 0, not pid 1)" There's no such thing as init_task. It's init, and its pid is 1, not 0 (confirmed via pidof init).

    – AleksandrH
    Sep 15 '18 at 14:42






  • 1





    @AleksandrH init_task is a kernel structure and not a process. It points to the idle task which is internally represented by pid 0. init_task and init are completely different things.

    – Flup
    Sep 15 '18 at 15:39











  • And yet pid is only for processes...

    – AleksandrH
    Sep 15 '18 at 16:38











  • @AleksandrH Read init/init_task.c in the kernel source tree (github.com/torvalds/linux/blob/master/init/init_task.c).

    – Flup
    Sep 15 '18 at 16:39













12












12








12







In the Linux kernel, each process is represented by a task_struct in a doubly-linked list, the head of which is init_task (pid 0, not pid 1). This is commonly known as the process table.



In user mode, the process table is visible to normal users under /proc. Taking the headings for your question:



  • Process identification data is the process ID (which is in the path /proc/<process-id>/...), the command line (cmd), and possibly other attributes depending on your definition of 'identification'.


  • Process state data includes scheduling data (sched, stat and schedstat), what the process is currently waiting on (wchan), its environment (environ) etc.


  • Process control data could be said to be its credentials (uid_map) and resource limits (limits).


So it all depends how you define your terms... but in general, all data about a process can be found in /proc.






share|improve this answer













In the Linux kernel, each process is represented by a task_struct in a doubly-linked list, the head of which is init_task (pid 0, not pid 1). This is commonly known as the process table.



In user mode, the process table is visible to normal users under /proc. Taking the headings for your question:



  • Process identification data is the process ID (which is in the path /proc/<process-id>/...), the command line (cmd), and possibly other attributes depending on your definition of 'identification'.


  • Process state data includes scheduling data (sched, stat and schedstat), what the process is currently waiting on (wchan), its environment (environ) etc.


  • Process control data could be said to be its credentials (uid_map) and resource limits (limits).


So it all depends how you define your terms... but in general, all data about a process can be found in /proc.







share|improve this answer












share|improve this answer



share|improve this answer










answered Aug 18 '14 at 7:38









FlupFlup

6,13912244




6,13912244












  • "the head of which is init_task (pid 0, not pid 1)" There's no such thing as init_task. It's init, and its pid is 1, not 0 (confirmed via pidof init).

    – AleksandrH
    Sep 15 '18 at 14:42






  • 1





    @AleksandrH init_task is a kernel structure and not a process. It points to the idle task which is internally represented by pid 0. init_task and init are completely different things.

    – Flup
    Sep 15 '18 at 15:39











  • And yet pid is only for processes...

    – AleksandrH
    Sep 15 '18 at 16:38











  • @AleksandrH Read init/init_task.c in the kernel source tree (github.com/torvalds/linux/blob/master/init/init_task.c).

    – Flup
    Sep 15 '18 at 16:39

















  • "the head of which is init_task (pid 0, not pid 1)" There's no such thing as init_task. It's init, and its pid is 1, not 0 (confirmed via pidof init).

    – AleksandrH
    Sep 15 '18 at 14:42






  • 1





    @AleksandrH init_task is a kernel structure and not a process. It points to the idle task which is internally represented by pid 0. init_task and init are completely different things.

    – Flup
    Sep 15 '18 at 15:39











  • And yet pid is only for processes...

    – AleksandrH
    Sep 15 '18 at 16:38











  • @AleksandrH Read init/init_task.c in the kernel source tree (github.com/torvalds/linux/blob/master/init/init_task.c).

    – Flup
    Sep 15 '18 at 16:39
















"the head of which is init_task (pid 0, not pid 1)" There's no such thing as init_task. It's init, and its pid is 1, not 0 (confirmed via pidof init).

– AleksandrH
Sep 15 '18 at 14:42





"the head of which is init_task (pid 0, not pid 1)" There's no such thing as init_task. It's init, and its pid is 1, not 0 (confirmed via pidof init).

– AleksandrH
Sep 15 '18 at 14:42




1




1





@AleksandrH init_task is a kernel structure and not a process. It points to the idle task which is internally represented by pid 0. init_task and init are completely different things.

– Flup
Sep 15 '18 at 15:39





@AleksandrH init_task is a kernel structure and not a process. It points to the idle task which is internally represented by pid 0. init_task and init are completely different things.

– Flup
Sep 15 '18 at 15:39













And yet pid is only for processes...

– AleksandrH
Sep 15 '18 at 16:38





And yet pid is only for processes...

– AleksandrH
Sep 15 '18 at 16:38













@AleksandrH Read init/init_task.c in the kernel source tree (github.com/torvalds/linux/blob/master/init/init_task.c).

– Flup
Sep 15 '18 at 16:39





@AleksandrH Read init/init_task.c in the kernel source tree (github.com/torvalds/linux/blob/master/init/init_task.c).

– Flup
Sep 15 '18 at 16:39

















draft saved

draft discarded
















































Thanks for contributing an answer to Unix & Linux Stack Exchange!


  • Please be sure to answer the question. Provide details and share your research!

But avoid …


  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.




draft saved


draft discarded














StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f150734%2fwhere-is-pcb-on-linux%23new-answer', 'question_page');

);

Post as a guest















Required, but never shown





















































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown

































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown







-cpu, linux, process
-

Popular posts from this blog

Word for a person who has no opinion about whether god existsWord for having a definite opinion while simultaneously withholding judgment?What's the opposite of “newcomer? Is ”veteran" OK?What do you call an “atheist” who might believe in an afterlife?What's a word for someone who wants to voice opinions but not have them challenged?Word for someone who dismisses contrary opinions as irrational?Somone who thinks they are overly special/out of the ordinaryIs there a word, phrase or idiom for “a person who is incapable of thinking about the future”?The belief that a god is human-likeA word for a non-famous person/thing you have heard a lot aboutAdjective for a person who enjoys taking care of their appearance

Image
Reverse string, can I make it faster? How strictly should I take "Candidates must be local"? Are there historical instances of the capital of a colonising country being temporarily or permanently shifted to one of its colonies? Accepted offer letter, position changed Could you please stop shuffling the deck and play already? How to secure an aircraft at a transient parking space? At what distance can a bugbear, holding a reach weapon, with the Polearm Master feat, get their Opportunity Attack? Why was Goose renamed from Chewie for the Captain Marvel film? Is it necessary to separate DC power cables and data cables? Is "history" a male-biased word ("his+story")? Why the color red for the Republican Party What's wrong with this bogus proof? Doesn't allowing a user mode program to access kernel space memory and execute the IN and OUT instructions defeat the purpose of having CPU modes? Can one live in the U.S. and not use a c...
Read more

What was this official D&D 3.5e Lovecraft-flavored rulebook?What was this set of RPG tools called?As a first-time DM should I let my players play complex character classes and roles?Nymph's Kiss and the RelationshipWhat was the name of this Cleric Prestige Class that shapes metal with its bare hands?Are the 3.5e Dragonlance books third party or official works?What's up with the domain Vile Darkness?What was this 80s book about RPGs?What was the name of this Werewolf band?What book had Rituals to “upgrade” animal companions to keep them viable at higher levels?What was this RPG that had rules for player-owned businesses?

Image
Can a Bard use an arcane focus? Indicating multiple different modes of speech (fantasy language or telepathy) The most efficient algorithm to find all possible integer pairs which sum to a given integer A known event to a history junkie How to color a zone in Tikz Simple image editor tool to draw a simple box/rectangle in an existing image Golf game boilerplate Can I use my Chinese passport to enter China after I acquired another citizenship? No idea how to draw this using tikz Is there an Impartial Brexit Deal comparison site? Reply ‘no position’ while the job posting is still there (‘HiWi’ position in Germany) Bob has never been a M before Lifted its hind leg on or lifted its hind leg towards? Can I rely on these GitHub repository files? How do I repair my stair bannister? Pronouncing Homer as in modern Greek What do you call the infoboxes with text and sometimes images on the side of a page we find in textbooks? What will be t...
Read more

2017 IndyCar Series Contents Series news Teams and drivers Schedule Season summary Footnotes References External links Navigation menu"INDYCAR: Initial 2018 bodywork concepts unveiled"the original"IndyCar confirms switch to Performance Friction brakes in 2017""AJ Foyt Racing will switch to Chevy"the original"Carlos Munoz, Conor Daly will drive for AJ Foyt Racing""Zach Veach's Indy 500 Debut Confirmed with Foyt""No mass exodus from Honda after Ganassi switch""Ex-F1 driver Sato joins Andretti Autosport for 2017 IndyCar season""IndyCar's Ryan Hunter-Reay, sponsor DHL paired through 2020""hhgregg and Andretti Autosport announce partnership for key races in 2016""INDYCAR: Rossi re-signs with Andretti"the original"McLaren Formula 1 - Fernando Alonso to race at Indy 500 with McLaren, Honda and Andretti Autosport""Shank will finally take part in Indy 500 with Harvey, Andretti | MotorSportsTalk""Andretti adds Jack Harvey to Indy 500 field""Ganassi switches to Honda power for 2017""INDYCAR: Chilton returns to Ganassi"the original"IndyCar silly season: Who's going where in 2017?""INDYCAR: Kanaan, NTT Data return to Ganassi"the original"Kimball to remain at Ganassi for 2017""Coyne confirms Bourdais for 2017 IndyCar season""Davison to sub for Bourdais in Indy 500"the original"Gutierrez confirmed for Detroit IndyCar debut""Gutierrez returns with Coyne for rest of 2017 season""Vautier to drive for Coyne at Texas"the original"INDYCAR: Coyne confirms Jones for 2017"the original"Pippa Mann returns to Coyne for Indy 500""Karam, Dreyer & Reinbold teaming up again for Indianapolis 500""Pigot to return to Ed Carpenter Racing""Hildebrand confirmed as full-time Ed Carpenter driver""Veach to replace injured Hildebrand at Barber"the originalNew Team Harding Racing Enters Chaves for 101st Indianapolis 500"Juncos Racing Announces Entry in 101st Running of the Indianapolis 500 :: Juncos Racing""Juncos confirms Pigot for Indy 500""Saavedra confirmed in Juncos' second 500 entry"the original"Lazier confirms Indy 500 run after son's USF2000 debut"the original"Claman DeMelo to race for RLLR at Sonoma"the original"Rahal signs Servia and ace engineer for 2017""IndyCar: Aleshin returns with Schmidt"the original"Aleshin replaced by Saavedra for Toronto""Jack Harvey will pilot SPM No. 7 car at Watkins Glen, Sonoma""Jay Howard confirmed in Tony Stewart's supported SPM Indy entry""INDYCAR: Newgarden to wave the flag at Penske"the original"Pagenaud opts for No. 1 in 2017"the original"Penske confirms Newgarden for 2017""Montoya to stay with Team Penske in 2017""Target leaving IndyCar after 27 seasons with Chip Ganassi""Cavin: IndyCar could see complete driver/team shakeup in 2017""End of the road for KV Racing?""KV Racing confirms closure, equipment sold to Juncos""Juncos confirms IndyCar Series entry"the original"Juncos readies IndyCar program, aims for '17 500"the original"Harding Racing to add Texas, Pocono to schedule"the original"Sato signs with Andretti Autosport for 2017""INDYCAR: Aleshin in Doubt at SPM"the original"Long Beach notebook: JR Hildebrand breaks hand""Hildebrand cleared to return at Phoenix"the original"Bourdais to undergo surgery on multiple fractures""Aleshin loses Schmidt Peterson IndyCar ride""Saavedra in at SPM for Pocono, Gateway"the original"Bourdais to make return at Gateway"the original"The IndyCar Grand Prix no longer is sponsored by Angie's List""2017 IndyCar Series rulebook""2017 Verizon IndyCar Series Official Rulebook"Official websiteeeeee

Image
1905190919101911191219131914191519161917191819191920192119221923192419251926192719281929193019311932193319341935193619371938193919401941194619471948194919501951195219531954195519791980198119821983198419851986198719881989199019911992199319941995199619971998199920002001200220032004200520062007200819961996–971998199920002001200220032004200520062007200820092010201120122013201420152016201720182019Kenny BräckBuzz CalkinsScott DixonDario FranchittiSam Hornish Jr.Ryan Hunter-ReayTony KanaanBuddy LazierJosef NewgardenSimon PagenaudWill PowerGreg RayScott SharpTony StewartDan WheldonGatewayIndianapolisIowaPoconoTexasBarberCircuit of the AmericasIndianapolisLaguna SecaMid-OhioPortlandRoad AmericaDetroitLong BeachSt. PetersburgTorontoAtlantaBaltimoreCharlotteChicagolandDoverEdmontonFontanaHomesteadHoustonKansasKentuckyLas VegasLouisianaMichiganMilwaukeeMotegiNashvilleNazarethNew HampshirePhoenixPikes PeakRichmondSão PauloSonomaSurfers ParadiseWalt Disney WorldWatkins GlenBostonBras...
Read more