QNX RTOS v4 Knowledge Base
QNX RTOS v4 Knowledge Base
| Title |
Number of child processes |
| Ref. No. |
QNX.000009722 |
| Category(ies) |
Utilities, Configuration |
| Issue |
When using fork(), how many child processes can be created by one parent process?
|
| Solution |
There is no specific limitation on the number of children for a specific parent. It will create children until it hits the system maximum number of processes(specified by the -p option to Proc32, default is 500).
For example:
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <process.h>
#include <sched.h>
#include <sys/qnx_glob.h>
void main(int argc, char *argv[], char *envp[]){
x09int i = 0;
x09pid_t pid;
x09while(1){
x09x09pid = fork();
x09x09if (pid <0){
x09x09x09printf("pid %d forked %d children n, getpid(), i);
x09x09x09exit(0);
x09x09}else if (pid > 0){
x09x09x09i++;
x09x09}else{
x09x09/*child*/
x09x09x09setprio(0, 1);
x09x09x09while(1);
x09x09}
x09}
}
This gives the result:
pid 11032 forked 352 children
x09 |
|
