/*
* Cancel a thread call. If it cannot be cancelled (i.e.
* is already in flight), waits for the most recent invocation
* to finish. Note that if clients re-submit this thread call,
* it may still be pending or in flight when thread_call_cancel_wait
* returns, but all requests to execute this work item prior
* to the call to thread_call_cancel_wait will have finished.
*/
boolean_t
thread_call_cancel_wait(
thread_call_t call)
{
boolean_t result;
thread_call_group_t group;
if ((call->tc_flags & THREAD_CALL_ALLOC) == 0) {
panic("%s: Can't wait on thread call whose storage I don't own.", __FUNCTION__);
}
group = thread_call_get_group(call);
(void) splsched();
thread_call_lock_spin();
result = _call_dequeue(call, group);
if (result == FALSE) {
thread_call_wait_locked(call);
}
thread_call_unlock();
(void) spllo();
return result;
}
/*
* _remove_from_delayed_queue:
*
* Remove the first (or all) matching
* entries from the delayed queue.
*
* Returns TRUE if any matching entries
* were found.
*
* Called with thread_call_lock held.
*/
static boolean_t
_remove_from_delayed_queue(
thread_call_func_t func,
thread_call_param_t param0,
boolean_t remove_all)
{
boolean_t call_removed = FALSE;
thread_call_t call;
thread_call_group_t group = &thread_call_groups[THREAD_CALL_PRIORITY_HIGH];
call = TC(queue_first(&group->delayed_queue));
while (!queue_end(&group->delayed_queue, qe(call))) {
if (call->tc_call.func == func &&
call->tc_call.param0 == param0) {
thread_call_t next = TC(queue_next(qe(call)));
_call_dequeue(call, group);
_internal_call_release(call);
call_removed = TRUE;
if (!remove_all)
break;
call = next;
}
else
call = TC(queue_next(qe(call)));
}
return (call_removed);
}
/*
* _remove_from_pending_queue:
*
* Remove the first (or all) matching
* entries from the pending queue.
*
* Returns TRUE if any matching entries
* were found.
*
* Called with thread_call_lock held.
*/
static boolean_t
_remove_from_pending_queue(
thread_call_func_t func,
thread_call_param_t param0,
boolean_t remove_all)
{
boolean_t call_removed = FALSE;
thread_call_t call;
thread_call_group_t group = &thread_call_group0;
call = TC(queue_first(&group->pending_queue));
while (!queue_end(&group->pending_queue, qe(call))) {
if ( call->func == func &&
call->param0 == param0 ) {
thread_call_t next = TC(queue_next(qe(call)));
_call_dequeue(call, group);
_internal_call_release(call);
call_removed = TRUE;
if (!remove_all)
break;
call = next;
}
else
call = TC(queue_next(qe(call)));
}
return (call_removed);
}
/*
* thread_call_cancel:
*
* Dequeue a callout entry.
*
* Returns TRUE if the call was
* on a queue.
*/
boolean_t
thread_call_cancel(
thread_call_t call)
{
boolean_t result;
thread_call_group_t group = &thread_call_group0;
spl_t s;
s = splsched();
thread_call_lock_spin();
result = _call_dequeue(call, group);
thread_call_unlock();
splx(s);
return (result);
}
