fork: Resource temporarily unavailable

[papori]

HELPPPP
i am using fedora 14 on dell latitude e6410,
i write a program in C.
using "fork"
after compile it write to me this message..............
fork: Resource temporarily unavailable

WHAT TO DO???

[mk27]

Try this:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>

int main(void) {
	int i;
	pid_t pid = fork();

	if (pid<0) {
		strerror(errno);
		return pid;
	}

	if (pid == 0) {
		for (i = 0; i < 3; i++) {
			puts("Child fork");
			sleep(1);
		}
		exit(0);
	} else {
		for (i = 0; i < 3; i++) {
			puts("Parent fork");
			sleep(1);
		}
	}

	return 0;
}

[papori]

Hey thanks,
maybe u can help me with another problem..
I am try to create 2 children
Each of them will sort half of the array.
for exemple:
my array: 1,0,5,2,8,6,9,10
the first child will sort 1,0,5,2 to 0,1,2,5
the second child will sort 8,6,9,10 to 6,8,9,10
my idea was : to send to qsort the 2 parts separately.
after both finish' the father will do merge..
i wrote a working megre func', and also the comp func-that the qsort use is working.

here is my output , so i can see that it sucsseed to sort the first half.. but why not the other ...and why 3 forks ???
output:
pfork pfork
pfork 0 1 2 5 8 6 9 10
1 0 5 2 8 6 9 10
to that code:

 01  for(k=0;k<2;k++){
02	    pfork = fork ();// fork kid
03	    if ( pfork == -1 ){//fork failed
04	        perror("fork");
05	        exit (3);
06	    }
07	    if (pfork==0){//only kid
08	      printf("pfork ");
09	      qsort(arr+(k*(4)),4,sizeof arr[0],comp);
10	       
11	    }
12	}
13	     
14	if (pfork!=0)
15	 for (  q = 0; q < p; q++ )
16	    wait(NULL);
17	    
           merge(arr);
18	     if(pfork!=0)
19	   for( i =0 ; i<n; i++)
20	     printf("%d ",arr[i]);

thanx!

[mk27]

Originally Posted by papori

...and why 3 forks ???

Take 3 guesses

 01  for(k=0;k<2;k++){
02	    pfork = fork ();// fork kid

As mentioned, this is a task much easier to accomplish with threads.

[stevea]

Just a suggestion for your sort. You probably want to use threads and not separate processes for this. That way you don't have to set up an IPC mechanism to merge the results.

Fork gives the child an exact copy of data, while threads can work on the same (static storage class) data.

man pthread_create


===

Also your original error "REsource temporaily ..." is errno of EAGAIN. See man fork for the cause.