10 More Discussions You Might Find Interesting
1. Programming
I understand that fork create a child but I need very simple example that make child useful....
I mean how will make the program faster anyone explain with code plz
using C plz (2 Replies)
Discussion started by: fwrlfo
2 Replies
2. UNIX for Dummies Questions & Answers
I'm trying to run a simple test on how to use fork(), i'm able to execute the child process first then the parent, but how can I execute parent then child..?
Thanks! (1 Reply)
Discussion started by: l flipboi l
1 Replies
3. Programming
does fork() spawn only the parent process, what if fork() is looped, does it spawn the parent and the child? (4 Replies)
Discussion started by: Peevish
4 Replies
4. Programming
Hi,
I wrote a simple program for understanding the fork command. The code is as below
int main(void)
{
fork(); printf("hi 1 \n");
fork(); printf("hi 2 \n");
fork(); printf("hi 3 \n");
}
I am getting a variation in the number of times the printf is called if i remove the \n from each... (2 Replies)
Discussion started by: xyz123456
2 Replies
5. UNIX for Advanced & Expert Users
Hi,
I wrote a simple program for understanding the fork command. The code is as below
int main(void)
{
fork(); printf("hi 1 \n");
fork(); printf("hi 2 \n");
fork(); printf("hi 3 \n");
}
I am getting a variation in the number of times the printf is called if i remove the \n from each of... (1 Reply)
Discussion started by: xyz123456
1 Replies
6. Programming
hi all
About this code
for (i = 1; i < n; i++)
if ((childpid = fork()) <= 0)
break;
I really can't understand the output .
and the way fork () return the value .
how about the process Id ,the child process Id and the parent ID
in this case
so please answer me soon (5 Replies)
Discussion started by: iwbasts
5 Replies
7. Programming
Hello all.
I'm developing a filetransfer application, which is supposed to work sort of like dcc, with multiple transfers etc. Now i wonder what the best way to manage the transfers is. Should i fork() for each new transfer, hogging loads of memory or use pthreads? Maybe I can use select to see... (0 Replies)
Discussion started by: crippe
0 Replies
8. Programming
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#define MAX_COUNT 200
#define BUF_SIZE 100
void main(void)
{
pid_t pid;
int i;
char buf;
fork();
pid = getpid();
for (i = 1; i <= MAX_COUNT; i++) {
sprintf(buf,... (2 Replies)
Discussion started by: MKSRaja
2 Replies
9. Programming
I run this code, actually I want to both processes print the message from "data". But only one does. What happens? Anyone can help?
#include <stdio.h>
main(){
int fd, pid;
char x;
fd = open("data",0); /* open file "data" */
pid = fork();
if(pid != 0){
wait(0);
... (2 Replies)
Discussion started by: Herman
2 Replies
10. UNIX for Dummies Questions & Answers
What is a fork? Why would one create a fork? What are the advantages and disadvantages of using a fork?
Please advise.
Thank You.
Deepali (5 Replies)
Discussion started by: Deepali
5 Replies
PTHREAD_ATFORK(3) BSD Library Functions Manual PTHREAD_ATFORK(3)
NAME
pthread_atfork -- register fork handlers
LIBRARY
POSIX Threads Library (libpthread, -lpthread)
SYNOPSIS
#include <pthread.h>
int
pthread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void));
DESCRIPTION
The pthread_atfork() function declares fork handlers to be called before and after fork(2), in the context of the thread that called fork(2).
The handlers registered with pthread_atfork() are called at the moments in time described below:
prepare Before fork(2) processing commences in the parent process. If more than one prepare handler is registered they will be called in
the opposite order they were registered.
parent After fork(2) completes in the parent process. If more than one parent handler is registered they will be called in the same order
they were registered.
child After fork(2) processing completes in the child process. If more than one child handler is registered they will be called in the
same order they were registered.
If no handling is desired at one or more of these three points, a null pointer may be passed as the corresponding fork handler.
RETURN VALUES
If successful, the pthread_atfork() function will return zero. Otherwise an error number will be returned to indicate the error.
ERRORS
The pthread_atfork() function will fail if:
[ENOMEM] Insufficient table space exists to record the fork handler addresses.
SEE ALSO
fork(2), pthread(3)
STANDARDS
The pthread_atfork() function is expected to conform to IEEE Std 1003.1 (``POSIX.1'').
AUTHORS
This manpage was written by Alex Vasylenko <lxv@omut.org>.
BSD
June 21, 2004 BSD