Subj : Re: passing an 'int' to a thread
To   : comp.programming.threads
From : ptjm
Date : Wed Jun 08 2005 06:28 am

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);
-- 

Patrick TJ McPhee
North York  Canada
ptjm@interlog.com

.