It only actually does the output when it has an end of record indicator. Unless you tell it to flush it. I wish I could remember more of my c programming better but this will work.
Hi,
Consider the following piece of code:
int main(void) {
int i;
pid_t pidp;
for (i=0;i<4;i++) {
switch (pidp=fork()) {
case -1:
fprintf(stdout, "Error during fork.\n");
exit (1);
case 0:
fprintf(stdout, "From child: I am... (4 Replies)
i'm just trying to make 2 process read from the same 1 line a time. For some reason only the child reads.
#include<stdio.h>
#include <sys/types.h>
void getlinefromfilep(void);
void getlinefromfilec(void);
int see=0;
FILE * fileptr1;
//need globe variable to tell pro3 to stop
main()... (3 Replies)
Hi. One of my company's customers requires mails to be sent to them to use TLS. Thanks to some good documentation on the web, I've got this mostly figured out, but now I'm stuck at generating the CSR.
My company's mail domain is sg.bunny.com (not real address, obviously), but the email gateway... (0 Replies)
I have this little program ...
int main(void){
printf("Before");
fork();
printf("After");
}
output is this.....
BeforeAfterBeforeAfter
Shouldnt it be.....BeforeAfterAfter
After parent is forked child receives the copy of program and continues from next statement... (3 Replies)
Hi All,
In my program i am handling SIGHUP signal. In the handler i fork and then exec on child process same binary file which is running. Parent process will die after 10 mins.
Now my child process which was exec with same binary file is not receiving SIGHUP signal. Below is the progran code:... (6 Replies)
i am a beginner of C, and i tired to fork multiple child and all of them belongs to same parents and each of child responsible for printing individual data.
but i don't have any idea how to do......
Can any body help? thanks a lot really. (7 Replies)
Hi, can someone please help me with creating mutltiple fork.. I was expecting something like this:
I am a child: 1 PID: 1215
I am a child: 2 PID: 1216
I am a child: 3 PID: 1217
I am a child: 4 PID: 1218
I am a child: 5 PID: 1219
I am a child: 6 PID: 1215
I am a child: 7 PID: 1216
I am a... (4 Replies)
Hello everyone, this is my first post.
I have a task to use a fork to create multiple processes and then use execlp to run another program to add 2 numbers.
The problem I am having is we are supposed to use the exit() call in the execlp to return the small integer. This is a bad way to... (3 Replies)
Good evening everyone. I have my finals and I'm facing a problem:
I have a for cycle that is supposed to fork 2 children but somehow it forks only the first one.
What am I doing wrong ?
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>... (1 Reply)
Hi guys,
I have the following code:
int main(int argc, char *argv)
{
int pid1,pid2,i=0;
pid1=fork();
i+=2;
if(!pid1) i++;
if(i%3) pid2=fork();
if (pid2==0)
{
printf("sea \n ");
i-=1;
}
if(i>=2)... (4 Replies)
Discussion started by: pfpietro
4 Replies
LEARN ABOUT DEBIAN
devel::refcount
Devel::Refcount(3pm) User Contributed Perl Documentation Devel::Refcount(3pm)NAME
"Devel::Refcount" - obtain the REFCNT value of a referent
SYNOPSIS
use Devel::Refcount qw( refcount );
my $anon = [];
print "Anon ARRAY $anon has " . refcount($anon) . " reference
";
my $otherref = $anon;
print "Anon ARRAY $anon now has " . refcount($anon) . " references
";
DESCRIPTION
This module provides a single function which obtains the reference count of the object being pointed to by the passed reference value.
FUNCTIONS
$count = refcount($ref)
Returns the reference count of the object being pointed to by $ref.
COMPARISON WITH SvREFCNT
This function differs from "Devel::Peek::SvREFCNT" in that SvREFCNT() gives the reference count of the SV object itself that it is passed,
whereas refcount() gives the count of the object being pointed to. This allows it to give the count of any referent (i.e. ARRAY, HASH,
CODE, GLOB and Regexp types) as well.
Consider the following example program:
use Devel::Peek qw( SvREFCNT );
use Devel::Refcount qw( refcount );
sub printcount
{
my $name = shift;
printf "%30s has SvREFCNT=%d, refcount=%d
",
$name, SvREFCNT($_[0]), refcount($_[0]);
}
my $var = [];
printcount 'Initially, $var', $var;
my $othervar = $var;
printcount 'Before CODE ref, $var', $var;
printcount '$othervar', $othervar;
my $code = sub { undef $var };
printcount 'After CODE ref, $var', $var;
printcount '$othervar', $othervar;
This produces the output
Initially, $var has SvREFCNT=1, refcount=1
Before CODE ref, $var has SvREFCNT=1, refcount=2
$othervar has SvREFCNT=1, refcount=2
After CODE ref, $var has SvREFCNT=2, refcount=2
$othervar has SvREFCNT=1, refcount=2
Here, we see that SvREFCNT() counts the number of references to the SV object passed in as the scalar value - the $var or $othervar
respectively, whereas refcount() counts the number of reference values that point to the referent object - the anonymous ARRAY in this
case.
Before the CODE reference is constructed, both $var and $othervar have SvREFCNT() of 1, as they exist only in the current lexical pad. The
anonymous ARRAY has a refcount() of 2, because both $var and $othervar store a reference to it.
After the CODE reference is constructed, the $var variable now has an SvREFCNT() of 2, because it also appears in the lexical pad for the
new anonymous CODE block.
PURE-PERL FALLBACK
An XS implementation of this function is provided, and is used by default. If the XS library cannot be loaded, a fallback implementation in
pure perl using the "B" module is used instead. This will behave identically, but is much slower.
Rate pp xs
pp 225985/s -- -66%
xs 669570/s 196% --
SEE ALSO
o Test::Refcount - assert reference counts on objects
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2011-11-15 Devel::Refcount(3pm)