What is fork()

Zaart · Jan 1, 2018

Nicolas said: ↑

Process does things A B C then fork() and thing D. So in memory it has ABCD
fork() created child that has only ABC in memory
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Amethyss said: ↑

when fork is call, from that point on, the parent and child will execute starting from the next line of the leftover code. From the example code Handsonic gave, after the fork, both the parent and the child will start at the if statement.
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lnv said: ↑

It splits off at the fork call. Like a fork.

But again, fork can very a lot depending on programming language or operating system.
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static7s said: ↑

In a way, yes.
Think of it like this: it clones itself, and the clone is assigned all the code in block A, while the original(parent) does all the code in block B.
Both the clone and the original have the same memories of everything up until the clone was created. Only after that point do they start to differ.
Typically, the clone would tell the original when it's finished its task, maybe pass some information back to the original, and then disappear.
The original would then execute some more code, and then it'd disappear too. Thus ending the program.
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Handsonic said: ↑

So at a more detailed level, when the original program (the parent process) calls fork, it **copies** all of the memory both statically and dynamically allocated memory and creates a new process. The new process will begin execution at the line after fork().

int pid;
pid fork();
/* new process (child) starts execution here and parent will continue execution here*/
if (pid == 0) { /* child */ }
else { /* parent */ }
...
/* both */

It's important to note that the memory is COPIED and not shared. Also note that you can end execution early for either process by returning or exiting.

EDIT: thanks @Amethyss shouldve made that more clear.
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criticalmind said: ↑

Sleep for a few hours and try again. Then check stackexchange.
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Thanks a lot guys, i think i understand now, after i try it a bit it should be good ^^

Scarlett · Jan 2, 2018

it's a written code that can be use to revise or develope

noob_slayer · Jan 6, 2018

Scarlett said: ↑

it's a written code that can be use to revise or develope
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Would it be my advantage if I know how to use it ?

Enchantress · Jan 9, 2018

it's a pig

Enchantress · Jan 11, 2018

Scarlett said: ↑

it's a written code that can be use to revise or develope
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hahahaha

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What is fork()

Zaart Deer Master Race

Scarlett Your Own Personal Gal ^.<

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Enchantress Active Member

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What is fork()

Zaart Deer Master Race

Scarlett Your Own Personal Gal ^.<

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