Subj : Re: passing an 'int' to a thread
To   : comp.programming.threads
From : Huub
Date : Wed Jun 08 2005 06:22 pm

Patrick TJ McPhee wrote:
> In article <42a671a3$0$156$3a628fcd@reader2.nntp.hccnet.nl>,
> Huub  <hdotvdotniekerkathccnetdotnl> wrote:
> 
> % You were right. The errors were due to a linking problem. And I made a 
> % another mistake which I corrected. Now something is being passed, but 
> % it's not the correct value. Could you tell me what is being passed: 
> % task_ids or t?
> 
> You're passing a pointer to int which is set to 0. This pointer is
> held in an array called task_ids, but you're not passing that array.
> It has the value of a variable called t, but you're not passing that
> variable.
> 
> Note that if you change the value of t, your code will be incorrect.
> 
> [...]
> 
> %    int *task_ids[1];
> 
> [...]
> 
> %    task_ids[t] = (int *) malloc(sizeof(int));
> %    *task_ids[t] = t;
> 
> You never use task_ids for anything else, so why not store the
> pointer in an ordinary pointer variable.
> 
>  int * task_id ;
> 
>  ...
> 
> 
>   task_id = (int *)malloc(sizeof(int)); /* or new(int) */
> 
>   *task_id = value;
> 
>   pthread_create(&tid, NULL, fn, (void *)task_id);
Thank you for your help.

.