void yield(scheduler& target, task_t next) {
scheduler::node self;
auto old = callcc(
std::move(next),
[&](task_t task) {
self.task = std::move(task);
target.push(&self);
return task;
});
assert(!old);
}
void details::scheduler_waiter::wait(std::uint32_t count) {
auto to = callcc
(details::scheduler_pop(),
[&](task_t c) {
task = std::move(c);
if ((signal_counter += count) <= 0)
details::scheduler_post(*this);
return c;
});
assert(!to);
}
void idle(scheduler& sched) {
scheduler_saver _ (sched);
auto next = sched.pop();
if (next == 0) {
sched.waiting.exchange(true);
sched.waiter.reset();
while ((next = sched.pop()) == 0)
sched.waiter.wait();
sched.waiting.store(0, std::memory_order_relaxed);
}
scheduler::node self;
auto old = callcc(
std::move(next->task),
[&](task_t task) {
self.task = std::move(task);
sched.push(&self);
return task;
});
assert(!old);
}
int is_valid(void* _ptr) {
ptr = _ptr;
signal(SIGSEGV, pf_handler);
return callcc(is_valid_handler);
}