Groups > comp.programming.threads > #677

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

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Date	Mon, 21 Nov 2011 03:29:05 +0000
From	Johann 'Myrkraverk' Oskarsson <johann@2ndquadrant.com>
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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?

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?

My current design calls for two integers passed to the newly created
threads.  I want something both safe and clean.  That is, minimum of
code clutter.

  
-- 
   Johann Oskarsson                http://www.2ndquadrant.com/    |[]
   PostgreSQL Development, 24x7 Support, Training and Services  --+--
                                                                  |
   Blog: http://my.opera.com/myrkraverk/blog/

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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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