/* Posts a message to the mbox, subject to flags. Feel free to send 0 for the
* flags if you don't want to give them the option of EVENT_NOMSG (which is what
* we do when sending an indirection event). Make sure that if mbox is a user
* pointer, that you've checked it *and* have that processes address space
* loaded. This can get called with a KVA for mbox. */
static void post_ev_msg(struct event_mbox *mbox, struct event_msg *msg,
int ev_flags)
{
printd("Sending event type %d\n", msg->ev_type);
/* Sanity check */
if (is_user_rwaddr(mbox))
assert(current);
/* If they just want a bit (NOMSG), just set the bit */
if (ev_flags & EVENT_NOMSG) {
SET_BITMASK_BIT_ATOMIC(mbox->ev_bitmap, msg->ev_type);
} else {
/* Enqueue returns 0 on success. On failure, set a bit. */
if (bcq_enqueue(&mbox->ev_msgs, msg, NR_BCQ_EVENTS, NR_BCQ_EV_LOOPS)) {
atomic_inc((atomic_t)&mbox->ev_overflows); // careful here
SET_BITMASK_BIT_ATOMIC(mbox->ev_bitmap, msg->ev_type);
/* Catch "lots" of overflows that aren't acknowledged */
if (mbox->ev_overflows > 10000)
warn("proc %d has way too many overflows", current->pid);
}
}
}
/* Posts a message to the mbox, subject to flags. Feel free to send 0 for the
* flags if you don't want to give them the option of EVENT_NOMSG (which is what
* we do when sending an indirection event). Make sure that if mbox is a user
* pointer, that you've checked it *and* have that processes address space
* loaded. This can get called with a KVA for mbox. */
static void post_ev_msg(struct proc *p, struct event_mbox *mbox,
struct event_msg *msg, int ev_flags)
{
printd("[kernel] Sending event type %d to mbox %p\n", msg->ev_type, mbox);
/* Sanity check */
assert(p);
/* If they just want a bit (NOMSG), just set the bit */
if (ev_flags & EVENT_NOMSG) {
SET_BITMASK_BIT_ATOMIC(mbox->ev_bitmap, msg->ev_type);
wmb();
mbox->ev_check_bits = TRUE;
} else {
send_ucq_msg(&mbox->ev_msgs, p, msg);
}
}
