Process don't share address space when forked.
On Fri, Jun 3, 2011 at 10:40 PM, nitish goyal <nitishgoy...@gmail.com>wrote:
> @ Lalit
> You are right.
>
> that's why i am saying how i can use semaphores in the above example
>
>
> On Fri, Jun 3, 2011 at 10:37 PM, LALIT SHARMA <lks.ru...@gmail.com> wrote:
>
>> While using fork(), child shares parent address space ,
>>
>> Correct me If I am wrong ..
>>
>> On Fri, Jun 3, 2011 at 10:28 PM, nitish goyal <nitishgoy...@gmail.com>
>> wrote:
>> > Hi all,
>> >
>> > I am stuck with this code..Can anyone tell me how to implement
>> semaphores in
>> > fork system call
>> > Code:
>> >
>> > #include<stdio.h>
>> >
>> > int signal(int *n);
>> > int wait(int *n);
>> >
>> >
>> > int main()
>> > {
>> > int n;
>> > n=0;
>> > if(fork())
>> > {
>> > printf("Hello");
>> > signal(&n);
>> > }
>> > else
>> > {
>> > wait(&n);
>> > printf("World");
>> > }
>> > }
>> > int signal(int *n)
>> > {
>> > (*n)++;
>> > }
>> > int wait(int *n)
>> > {
>> > while((*n)<=0);
>> > (*n)--;
>> > }
>> >
>> > Since parent process and child process will be having different address
>> > spaces...so change of n in one address space will not be visible to
>> other.so
>> > please tell me how to make n visible to both the processes
>> >
>> > On Fri, Jun 3, 2011 at 2:45 PM, Subhransu <
>> subhransu.panigr...@gmail.com>
>> > wrote:
>> >>
>> >> Here you go in C code
>> >> http://codepad.org/gk6AZj0T
>> >>
>> >>
>> >> int main()
>> >> {
>> >> if(printf("hello")!=0) {
>> >> printf("world");
>> >> }
>> >> else {
>> >> printf("SCREWED ! ! !"); }
>> >>
>> >> return 0;
>> >> }
>> >>
>> >>
>> >> Subhransu Panigrahi
>> >>
>> >> Mobile: +91-9840931538
>> >> Email: subhransu.panigr...@gmail.com
>> >>
>> >>
>> >> On Fri, Jun 3, 2011 at 1:57 PM, Naveen Kumar <
>> naveenkumarve...@gmail.com>
>> >> wrote:
>> >>>
>> >>> Hi Shachindra,
>> >>> I don't think letters will be jumbled because we a calling one api to
>> >>> output on console & tty's driver takes whole line and output it at
>> once.
>> >>>
>> >>> On Fri, Jun 3, 2011 at 12:40 PM, Vishal Thanki <
>> vishaltha...@gmail.com>
>> >>> wrote:
>> >>>>
>> >>>> @sachindra, @naveen,
>> >>>> this was just a plain trick to execute "if" and "else" block. i agree
>> >>>> with your concerns :)
>> >>>>
>> >>>> 2011/6/3 Vιиodh <vinodh...@gmail.com>:
>> >>>> > @vishal:
>> >>>> > can u explain the fork() solution??
>> >>>> >
>> >>>> > On Fri, Jun 3, 2011 at 12:16 PM, Shachindra A C
>> >>>> > <sachindr...@gmail.com>
>> >>>> > wrote:
>> >>>> >>
>> >>>> >> There can be some synchronisation problems with fork() right? say
>> >>>> >> world
>> >>>> >> might get printed first...or maybe the letters can get jumbled
>> >>>> >> too...We
>> >>>> >> cannot guarantee the order of execution unless we use semaphores.
>> >>>> >>
>> >>>> >> On Fri, Jun 3, 2011 at 12:14 PM, Naveen Kumar
>> >>>> >> <naveenkumarve...@gmail.com>
>> >>>> >> wrote:
>> >>>> >>>
>> >>>> >>> oh yes,
>> >>>> >>> gud one
>> >>>> >>>
>> >>>> >>> On Fri, Jun 3, 2011 at 12:12 PM, Vishal Thanki
>> >>>> >>> <vishaltha...@gmail.com>
>> >>>> >>> wrote:
>> >>>> >>>>
>> >>>> >>>> vishal@ubuntu:~/progs/c\ 12:11:53 PM >$ cat fork.c
>> >>>> >>>> #include <stdio.h>
>> >>>> >>>> #include <stdlib.h>
>> >>>> >>>>
>> >>>> >>>> int main()
>> >>>> >>>> {
>> >>>> >>>> if (fork()) {
>> >>>> >>>> printf("hello ");
>> >>>> >>>> } else {
>> >>>> >>>> printf("world\n");
>> >>>> >>>> }
>> >>>> >>>> return 0;
>> >>>> >>>> }
>> >>>> >>>> vishal@ubuntu:~/progs/c\ 12:11:56 PM >$ gcc fork.c
>> >>>> >>>> vishal@ubuntu:~/progs/c\ 12:12:06 PM >$ ./a.out
>> >>>> >>>> hello world
>> >>>> >>>>
>> >>>> >>>>
>> >>>> >>>> On Fri, Jun 3, 2011 at 12:09 PM, Naveen Kumar
>> >>>> >>>> <naveenkumarve...@gmail.com> wrote:
>> >>>> >>>> > Hi Vishal,
>> >>>> >>>> >
>> >>>> >>>> > Can you show us how it be done with fork?
>> >>>> >>>> >
>> >>>> >>>> > On Fri, Jun 3, 2011 at 12:02 PM, Vishal Thanki
>> >>>> >>>> > <vishaltha...@gmail.com>
>> >>>> >>>> > wrote:
>> >>>> >>>> >>
>> >>>> >>>> >> can use fork() also..
>> >>>> >>>> >>
>> >>>> >>>> >> On Fri, Jun 3, 2011 at 11:57 AM, anand karthik
>> >>>> >>>> >> <anandkarthik....@gmail.com> wrote:
>> >>>> >>>> >> > (!printf("Hello"))
>> >>>> >>>> >> >
>> >>>> >>>> >> > On Jun 3, 2011 11:52 AM, "Arpit Mittal"
>> >>>> >>>> >> > <mrmittalro...@gmail.com>
>> >>>> >>>> >> > wrote:
>> >>>> >>>> >> >> Please help me in this question.
>> >>>> >>>> >> >>
>> >>>> >>>> >> >> What's the "condition" so that the following code prints
>> both
>> >>>> >>>> >> >> HelloWorld !
>> >>>> >>>> >> >>
>> >>>> >>>> >> >> if "condition"
>> >>>> >>>> >> >> printf ("Hello");
>> >>>> >>>> >> >> else
>> >>>> >>>> >> >> printf("World");
>> >>>> >>>> >> >>
>> >>>> >>>> >> >>
>> >>>> >>>> >> >>
>> >>>> >>>> >> >>
>> >>>> >>>> >> >> --
>> >>>> >>>> >> >> -Arpit Mittal
>> >>>> >>>> >> >> 6th Semester,
>> >>>> >>>> >> >> Indian Institute of Information Technology,Allahabad
>> >>>> >>>> >> >> Email : arpitmittal.ii...@gmail.com
>> >>>> >>>> >> >> rit2008...@iiita.ac.in
>> >>>> >>>> >> >> Contact : +91-8853049787
>> >>>> >>>> >> >>
>> >>>> >>>> >> >> Let every man be respected as an individual and no man
>> >>>> >>>> >> >> idolized.
>> >>>> >>>> >> >>
>> >>>> >>>> >> >> --
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>> >>>> >>>> >> >>
>> >>>> >>>> >> >
>> >>>> >>>> >> > --
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>> >>>> >>>> >> >
>> >>>> >>>> >>
>> >>>> >>>> >> --
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>> >>>> >>>> >>
>> >>>> >>>> >
>> >>>> >>>> >
>> >>>> >>>> >
>> >>>> >>>> > --
>> >>>> >>>> > Cheers
>> >>>> >>>> > Naveen Kumar
>> >>>> >>>> >
>> >>>> >>>> > --
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>> >>>> >>>> >
>> >>>> >>>>
>> >>>> >>>> --
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>> >>>> >>>>
>> >>>> >>>
>> >>>> >>>
>> >>>> >>>
>> >>>> >>> --
>> >>>> >>> Cheers
>> >>>> >>> Naveen Kumar
>> >>>> >>>
>> >>>> >>> --
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>> >>>> >>
>> >>>> >>
>> >>>> >>
>> >>>> >> --
>> >>>> >> Regards,
>> >>>> >> Shachindra A C
>> >>>> >>
>> >>>> >> --
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>> >>>> >
>> >>>> >
>> >>>> >
>> >>>> > --
>> >>>> > With regards,
>> >>>> > Vιиodh
>> >>>> >
>> >>>> > --
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>> >>>> >
>> >>>>
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>> >>>>
>> >>>
>> >>>
>> >>>
>> >>> --
>> >>> Cheers
>> >>> Naveen Kumar
>> >>>
>> >>> --
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>> >>
>> >> --
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>> >
>> >
>> >
>> > --
>> > Regards,
>> > Nitish Goyal
>> > Undergraduate Student Of NSIT,
>> > Computer Engineering (B.E.)
>> > Asst. PlaceComm 2011
>> > contact me:- +91-9999605824
>> > Reply at :- nitishgoyal.n...@gmail.com
>> >
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>> >
>>
>>
>>
>> --
>> Lalit Kishore Sharma,
>> IIIT Allahabad (Amethi Capmus),
>> 6th Sem.
>>
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>>
>
>
> --
> Regards,
> Nitish Goyal
> Undergraduate Student Of NSIT,
> Computer Engineering (B.E.)
> Asst. PlaceComm 2011
> contact me:- +91-9999605824
> Reply at :- nitishgoyal.n...@gmail.com
>
>
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>
--
Cheers
Naveen Kumar
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