/******************************************************************************
* ddekit_lock_init_locked *
*****************************************************************************/
PUBLIC void ddekit_lock_init_locked(ddekit_lock_t *mtx)
{
(*mtx) = (struct ddekit_lock *)
ddekit_simple_malloc(sizeof(struct ddekit_lock));
(*mtx)->wait_queue = NULL;
(*mtx)->owner = ddekit_thread_myself();
}
/******************************************************************************
* ddekit_lock_try_lock *
*****************************************************************************/
PUBLIC int ddekit_lock_try_lock(ddekit_lock_t *mtx)
{
if ((*mtx)->owner == NULL) {
(*mtx)->owner = ddekit_thread_myself();
return 0;
} else {
return -1;
}
}
/******************************************************************************
* ddekit_lock_lock *
*****************************************************************************/
PUBLIC void ddekit_lock_lock (ddekit_lock_t *mtx)
{
if ((*mtx)->owner == NULL) {
(*mtx)->owner = ddekit_thread_myself();
} else {
if ((*mtx)->wait_queue == NULL) {
(*mtx)->wait_queue = ddekit_thread_myself();
} else {
ddekit_thread_t *pos = (*mtx)->wait_queue;
while(pos->next != NULL) {
pos = pos->next;
}
pos->next = ddekit_thread_myself();
}
_ddekit_thread_schedule();
if ((*mtx)->owner != NULL) {
_ddekit_print_backtrace((*mtx)->owner);
_ddekit_print_backtrace(ddekit_thread_myself());
ddekit_panic("owner!=NULL: %s (I am %s)\n",
(*mtx)->owner->name, ddekit_thread_myself()->name);
}
(*mtx)->owner = ddekit_thread_myself();
}
}
/* Process setup for worker threads */
int l4dde26_process_add_worker(void)
{
dde26_thread_data *cur = init_dde26_thread();
/* If this function is called for a kernel_thread, the thread already has
* been set up and we just need to store a reference to the ddekit struct.
* However, this function may also be called directly to turn an L4 thread
* into a DDE thread. Then, we need to initialize here. */
cur->_ddekit_thread = ddekit_thread_myself();
if (cur->_ddekit_thread == NULL)
cur->_ddekit_thread = ddekit_thread_setup_myself(".dde26_thread");
Assert(cur->_ddekit_thread);
ddekit_thread_set_my_data(cur);
attach_pid(LX_TASK(cur), 0, &cur->_vpid);
/* Linux' default is to have this set to 1 initially and let the
* scheduler set this to 0 later on.
*/
current_thread_info()->preempt_count = 0;
return 0;
}
