Passing socket struct between kernel threads - module programming


 
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Old 02-12-2009
Error Passing socket struct between kernel threads - module programming

I write kernel module with kernel threads using
linux/kthread.h on 2.6.* kernel

I tried to passing data between two kernel threads
with data argument of kthread_run( fun, data , NAME );
but this is not work I dont know why. I tried many possibility
and nothing works.

So I thought that maybe something like this will work
but not.
Code:
typedef struct my {
    struct socket *tmp;
    struct task_struct *task;
    int (*fun)(void * );
} table[10];
/* this is global static table */

int kthread_fun1(void *d) {
    sock_create( ...., &(tab[0].tmp) )
    printk(" %p ", tab[0].tmp ) <- THIS IS NOT NULL OK
}

int ktrhead_fun2( void *d ) {
    tab[0].tmp <- THIS IS NULL IN THIS CASE WHY

}

init_function_of_module {
    kthread_run( ..., fun1, ... )
 
    kthread_run( ..., fun2, ... )
}

Iam sure that fun1 thread was executed before fun2, I used semaphores ( actually completion mechanism ).
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lock_init(9r)															     lock_init(9r)

NAME
lock_init - General: Initializes a complex lock SYNOPSIS
#include <kern/lock.h> void lock_init( lock_t lock_structptr, boolean_t can_sleep ); ARGUMENTS
Specifies a pointer to the complex lock structure, lock. The lock structure is an opaque data structure; that is, its associated members are referenced and manipulated by the operating system and not by the user of the complex lock mechanism. Specifies a Boolean value that indicates whether to allow kernel threads to block (sleep) if the complex lock is asserted. You can pass to this argument only the value TRUE (allow kernel threads to block if the lock is asserted). DESCRIPTION
The lock_init routine initializes a complex lock. You identify this lock by declaring a pointer to a complex lock structure and passing it as the first argument. The complex lock structure pointer must be initialized before you can assert read and write operations on the com- plex lock. RETURN VALUES
None FILES
SEE ALSO
Routines: lock_done(9r), lock_read(9r), lock_terminate(9r), lock_try_read(9r), lock_try_write(9r), lock_write(9r) Data Structures: lock(9s) lock_init(9r)