passing a structure to a pthread

[shorinhio]

I am just learning pthreads, and the only examples I have pass an int pointer to the shared data which is an integer(obviously).

I have a structure:

struct player { char form; char first_team; char playing; };

I have a 2D array of cells each containing a player structure:

struct player myplayer[r][c];

I am trying to get each of these cells in the 2D array to run its own pthread, in which the thread's function changes some of the variables (form, first_team, playing) of the structure.
At the moment I keep getting 'myplayer[0][0] is undefined in the function...' so I am not passing it correctly as I am unsure how to do this.

I am having trouble with the syntax for passing this structure/ a pointer to this structure to the pthread. Any help would be greatly appreciated. Thanks.

[ssharish2005]

struct player myplayer[r][c];

u cont do this. when u declare an array u should specify it size as an const value. It cant be variable which gives you a size. Well see the below code

struct player myplayer[10][10];

This is a 10 by 10 2D array of type struct player

ssharish2005

[shorinhio]

yes i actually have used constants, just quickly put r and c for the purpose of the example. thanks.

[Salem]

So if you have a 10x10 array, that's 100 threads you're creating right - one for each element of the array.
That's a lot of threads, and a lot of thread overheads.

When you create the thread, pass something like
&myplayer[0][0]
which is a pointer to a specific element.

In the thread, cast the void* pointer to
struct player *playerPtr = voidptr;

[shorinhio]

Thanks Salem, exactly what I needed. No I won't have an overhead that big fortunately!