bool advance() {
auto n_results = aku_cursor_read(cursor_, &sample_, sizeof(aku_Sample));
if (can_proceed()) {
// Return true if cache is not empty
assert(n_results == 0 || n_results == sizeof(aku_Sample));
return n_results;
}
return false;
}
static int wait_for_queue(struct task_struct** task_storage, bool(*can_proceed)(struct kfifo*), struct kfifo * queue) {
*task_storage = current;
set_current_state(TASK_INTERRUPTIBLE);
while (!can_proceed(queue)) {
schedule();
set_current_state(TASK_INTERRUPTIBLE);
}
__set_current_state(TASK_RUNNING);
*task_storage = NULL;
return 0;
}
LocalCursor(aku_Database *db, aku_Cursor *cursor)
: db_(db)
, cursor_(cursor)
{
can_proceed();
}
