@vishal
plz help me in understanding fork function...how it is working.??
On Fri, Jun 3, 2011 at 9:58 AM, nitish goyal <[email protected]> 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
> <[email protected]>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:* [email protected]
>>
>>
>>
>> On Fri, Jun 3, 2011 at 1:57 PM, Naveen Kumar
>> <[email protected]>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
>>> <[email protected]>wrote:
>>>
>>>> @sachindra, @naveen,
>>>> this was just a plain trick to execute "if" and "else" block. i agree
>>>> with your concerns :)
>>>>
>>>> 2011/6/3 Vιиodh <[email protected]>:
>>>> > @vishal:
>>>> > can u explain the fork() solution??
>>>> >
>>>> > On Fri, Jun 3, 2011 at 12:16 PM, Shachindra A C <
>>>> [email protected]>
>>>> > 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 <
>>>> [email protected]>
>>>> >> wrote:
>>>> >>>
>>>> >>> oh yes,
>>>> >>> gud one
>>>> >>>
>>>> >>> On Fri, Jun 3, 2011 at 12:12 PM, Vishal Thanki <
>>>> [email protected]>
>>>> >>> 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
>>>> >>>> <[email protected]> wrote:
>>>> >>>> > Hi Vishal,
>>>> >>>> >
>>>> >>>> > Can you show us how it be done with fork?
>>>> >>>> >
>>>> >>>> > On Fri, Jun 3, 2011 at 12:02 PM, Vishal Thanki
>>>> >>>> > <[email protected]>
>>>> >>>> > wrote:
>>>> >>>> >>
>>>> >>>> >> can use fork() also..
>>>> >>>> >>
>>>> >>>> >> On Fri, Jun 3, 2011 at 11:57 AM, anand karthik
>>>> >>>> >> <[email protected]> wrote:
>>>> >>>> >> > (!printf("Hello"))
>>>> >>>> >> >
>>>> >>>> >> > On Jun 3, 2011 11:52 AM, "Arpit Mittal" <
>>>> [email protected]>
>>>> >>>> >> > 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 : [email protected]
>>>> >>>> >> >> [email protected]
>>>> >>>> >> >> 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 :- [email protected]
>
>
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