M
/ \
/ \
/ \
/ \
/ \
/ \
/ \
M
C1
/ \
/ \
/
\ / \
/
\ / \
/
\ / \
M C2
C1 C3
/ \
/ \ / \ / \
/ \
/ \ / \
/ \
M C4 C2
C5 C1 C6 C3 C7
/ \ / \ /
\ / \ / \ / \ /
\ / \
M C8 C4 C9 C2 C10 C5 C11 C1 C12
C6 C13 C4 C14 C7 C15
M C4 C2 C5 C1 C6 C3 C7 (one level upper will have ret>0 and rest will have
ret =0
Just think ur self how any process and its child have pid==0 ???
I hope its clear now...
On Mon, Aug 8, 2011 at 8:05 PM, aditi garg <[email protected]>wrote:
> @ sagar: wat wud be the order? as in all 8 frst wud return non zero and
> rest 0 or wat?
>
>
> On Mon, Aug 8, 2011 at 6:50 PM, Kamakshii Aggarwal
> <[email protected]>wrote:
>
>> ok ..thanks sagar..:)
>>
>>
>> On Mon, Aug 8, 2011 at 6:42 PM, sagar pareek <[email protected]>wrote:
>>
>>> lets label your forks :-
>>> main()
>>> {
>>> int ret;
>>> ret=fork(); ------ 1
>>> ret=fork(); ------ 2
>>> ret=fork(); ------- 3
>>> ret=fork(); ------- 4
>>>
>>> if(!ret)
>>> printf("one");
>>> else
>>> printf("two");
>>> }
>>>
>>> Now
>>> original main() is suppose named M
>>> then after encountering fork() 1st then
>>>
>>>
>>> M
>>>
>>> / \
>>>
>>> / \
>>>
>>> / \
>>>
>>> M C1
>>>
>>>
>>> now after fork() -2
>>>
>>>
>>> M
>>>
>>> / \
>>>
>>> / \
>>>
>>> / \
>>>
>>> M C1
>>>
>>> / \ / \
>>>
>>> M C2 C1 C3
>>>
>>>
>>> after fork()- 4
>>>
>>> it will be
>>> M
>>> C1 C2 C3 ...... C15
>>> now we have half of them include main() have ret!=0
>>> and rest of them ret=0
>>>
>>> i hope its clear now...
>>>
>>>
>>> On Mon, Aug 8, 2011 at 12:53 PM, Shachindra A C
>>> <[email protected]>wrote:
>>>
>>>> At the point of execution of the 4th fork(), there are 8 processes i.e,
>>>> the 4th fork will get executed 8 times. The final value of ret will depend
>>>> on this fork. the fork will return 0 in the 8 child processes created and
>>>> returns pid of the child in the parent processes.
>>>>
>>>>
>>>> On Mon, Aug 8, 2011 at 12:49 PM, Kamakshii Aggarwal <
>>>> [email protected]> wrote:
>>>>
>>>>> then please elaborate?
>>>>>
>>>>>
>>>>> On Mon, Aug 8, 2011 at 12:34 PM, Pradex <[email protected]>wrote:
>>>>>
>>>>>> get it..!! :) :)
>>>>>>
>>>>>> On Aug 7, 10:49 pm, Shachindra A C <[email protected]> wrote:
>>>>>> > 8 one's and 8 two's. The order in which they get printed might vary.
>>>>>> >
>>>>>> > On Mon, Aug 8, 2011 at 11:11 AM, Kamakshii Aggarwal
>>>>>> > <[email protected]>wrote:
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> > > what will be the o/p of the following program:
>>>>>> >
>>>>>> > > main()
>>>>>> > > {
>>>>>> > > int ret;
>>>>>> > > ret=fork();
>>>>>> > > ret=fork();
>>>>>> > > ret=fork();
>>>>>> > > ret=fork();
>>>>>> >
>>>>>> > > if(!ret)
>>>>>> > > printf("one");
>>>>>> > > else
>>>>>> > > printf("two");
>>>>>> > > }
>>>>>> >
>>>>>> > > --
>>>>>> > > Regards,
>>>>>> > > Kamakshi
>>>>>> > > [email protected]
>>>>>> >
>>>>>> > > --
>>>>>> > > You received this message because you are subscribed to the Google
>>>>>> Groups
>>>>>> > > "Algorithm Geeks" group.
>>>>>> > > To post to this group, send email to [email protected].
>>>>>> > > To unsubscribe from this group, send email to
>>>>>> > > [email protected].
>>>>>> > > For more options, visit this group at
>>>>>> > >http://groups.google.com/group/algogeeks?hl=en.
>>>>>> >
>>>>>> > --
>>>>>> > Regards,
>>>>>> > Shachindra A C
>>>>>>
>>>>>> --
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>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Regards,
>>>>> Kamakshi
>>>>> [email protected]
>>>>>
>>>>> --
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>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Regards,
>>>> Shachindra A C
>>>>
>>>> --
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>>>>
>>>
>>>
>>>
>>> --
>>> **Regards
>>> SAGAR PAREEK
>>> COMPUTER SCIENCE AND ENGINEERING
>>> NIT ALLAHABAD
>>>
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>>>
>>
>>
>>
>> --
>> Regards,
>> Kamakshi
>> [email protected]
>>
>> --
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>>
>
>
>
> --
> Aditi Garg
> Undergraduate Student
> Electronics & Communication Divison
> NETAJI SUBHAS INSTITUTE OF TECHNOLOGY
> Sector 3, Dwarka
> New Delhi
>
>
> --
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>
--
**Regards
SAGAR PAREEK
COMPUTER SCIENCE AND ENGINEERING
NIT ALLAHABAD
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