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Threads are created as seperate processes
Hi,
I have a small prog which creates threads,
but on Redhat AS 2.1 kernel : 2.4.9-e.24
===============================================================
pid_t pid=fork();
if (pid == 0)
{
//create another child
pid_t newchild = fork();
if (newchild == 0)
{
//child of child
/* Create independant threads each of which will execute function */
iret1 = pthread_create( &thread1, NULL, print_message_function, (void*) message1);
iret2 = pthread_create( &thread2, NULL, print_message_function, (void*) message2);
/* Wait till threads are complete before main continues. Unless we */
/* wait we run the risk of executing an exit which will terminate */
/* the process and all threads before the threads have completed. */
sleep(50);
pthread_join( thread1, NULL);
pthread_join( thread2, NULL);
}
else
{
p1= pthread_create( &thread1, NULL, print_message_function, (void*) message1);
p2 = pthread_create( &thread2, NULL, print_message_function, (void*) message2);
sleep (50); //just to check
pthread_join( thread1, NULL);
pthread_join( thread2, NULL);
}
}
else{
waitpid(pid,NULL,0);
}
return 0;
}
void *print_message_function( void *ptr )
{
char *message;
message = (char *) ptr;
printf("%s \n", message);
}
================================================================
this progs actually creates 2 processes and 4 threads,
but when i check the with ps -e i see many process instead of threads,
here is the sample output of pstree
pstree -p 22203
threads(22203)---threads(22204)-+-threads(22205)---threads(22207)
`-threads(22206)
My questions is i should see only 2 processes but here i am seeing many processes,
the threads are not getting created as threads but as processes...
is this is a known problem , if so is there any fix avaliable...
Thanks in advance.
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