Re: thread group comments

[Andi Kleen]

On Fri, Sep 01, 2000 at 06:15:52PM -0700, Linus Torvalds wrote:
> 
>                 if (!has_done_this_before) {
>                         pid_t tid;
>                         has_done_this_before = 1;
>                         tid = clone(CLONE_PID);

I'm not sure this will work very well (2.4.0test8-pre1):

int do_fork(unsigned long clone_flags, unsigned long usp, struct pt_regs *regs)
{
        int retval = -ENOMEM;
        struct task_struct *p;
        DECLARE_MUTEX_LOCKED(sem);

        if (clone_flags & CLONE_PID) {
                /* This is only allowed from the boot up thread */
                if (current->pid)
                        return -EPERM;
        }


So it would require fixing CLONE_PID first, which is probably nasty.

Without it it'll still require the context switches when you're calling
pthread_create from the "original" thread.


-Andi
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