Groups > comp.programming.threads > #678

Re: Is pthread_create( id, 0, f, &something_on_my_stack ); safe?

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From	Ian Collins <ian-news@hotmail.com>
Newsgroups	comp.programming.threads
Subject	Re: Is pthread_create( id, 0, f, &something_on_my_stack ); safe?
Date	Mon, 21 Nov 2011 20:00:35 +1300
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On 11/21/11 04:29 PM, Johann 'Myrkraverk' Oskarsson wrote:
> Hi all,
>
> Given
>
>    void *f( void *j )
>    {
>      int i = *((int *)j);
>      //..
>    }
>
>    void g( void )
>    {
>      pthread_t *id = ...;
>      int something_on_my_stack = 42; // Life, universe&  everything
>      pthread_create( id, 0, f,&something_on_my_stack );
>
> is there any guarantee the value has been copied to f()s stack by the
> time pthread_create() returns?

No.

> Or, to be a little bit more explicit, is there anything I can use for
> safe argument passing to newly created threads without allocating new
> memory and (presumably) have the threads free it?

I can't see any problem with

static int something_on_my_stack = 42;

-- 
Ian Collins

Thread

Is pthread_create( id, 0, f, &something_on_my_stack ); safe? Johann 'Myrkraverk' Oskarsson <johann@2ndquadrant.com> - 2011-11-21 03:29 +0000
  Re: Is pthread_create( id, 0, f, &something_on_my_stack ); safe? Ian Collins <ian-news@hotmail.com> - 2011-11-21 20:00 +1300
    Re: Is pthread_create( id, 0, f, &something_on_my_stack ); safe? Marcel Müller <news.5.maazl@spamgourmet.com> - 2011-11-21 08:48 +0100
    Re: Is pthread_create( id, 0, f, &something_on_my_stack ); safe? Johann 'Myrkraverk' Oskarsson <johann@2ndquadrant.com> - 2011-11-21 07:56 +0000
      Re: Is pthread_create( id, 0, f, &something_on_my_stack ); safe? Ian Collins <ian-news@hotmail.com> - 2011-11-21 21:01 +1300
      Re: Is pthread_create( id, 0, f, &something_on_my_stack ); safe? David Schwartz <davids@webmaster.com> - 2011-11-21 12:06 -0800
        Re: Is pthread_create( id, 0, f, &something_on_my_stack ); safe? Johann 'Myrkraverk' Oskarsson <johann@2ndquadrant.com> - 2011-11-21 20:30 +0000
          Re: Is pthread_create( id, 0, f, &something_on_my_stack ); safe? Casper H.S. Dik <Casper.Dik@OrSPaMcle.COM> - 2011-11-21 23:07 +0000
            Re: Is pthread_create( id, 0, f, &something_on_my_stack ); safe? Johann 'Myrkraverk' Oskarsson <johann@2ndquadrant.com> - 2011-11-22 05:31 +0000
            Re: Is pthread_create( id, 0, f, &something_on_my_stack ); safe? blmblm@myrealbox.com <blmblm.myrealbox@gmail.com> - 2011-11-25 17:49 +0000
          Re: Is pthread_create( id, 0, f, &something_on_my_stack ); safe? David Schwartz <davids@webmaster.com> - 2011-11-23 12:53 -0800
  Re: Is pthread_create( id, 0, f, &something_on_my_stack ); safe? Robert Wessel <robertwessel2@yahoo.com> - 2011-11-21 02:28 -0600
  Re: Is pthread_create( id, 0, f, &something_on_my_stack ); safe? "Ersek, Laszlo" <lacos@caesar.elte.hu> - 2011-11-22 21:06 +0100

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