[lwip-users] mutex API in system layer is necessary ?

[vincent cui]

All:

 

I had port latest lwip1.4.0 to my system, it works well . but I found some additional api about mutex are defined in 1.4.0

 

I want to know that are they necessary ?

 

 

err_t sys_mutex_new(sys_mutex_t *mutex)

{

         return ERR_OK;

}

 

void sys_mutex_lock(sys_mutex_t *mutex)

{

 

}

 

void sys_mutex_unlock(sys_mutex_t *mutex)

{

 

}

 

void sys_mutex_free(sys_mutex_t *mutex)

{

 

}

 

int sys_mutex_valid(sys_mutex_t *mutex)

{

        return (int )(*mutex);

}

 

void sys_mutex_set_invalid(sys_mutex_t *mutex)

{

         *mutex = SYS_SEM_NULL;

}