// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Can't compile this for Zircon userspace yet since libstdc++ isn't available.
#ifndef FIT_NO_STD_FOR_ZIRCON_USERSPACE

#include <lib/fit/promise.h>

namespace fit {

suspended_task::suspended_task(const suspended_task& other)
    : resolver_(other.resolver_),
      ticket_(resolver_ ? resolver_->duplicate_ticket(other.ticket_) : 0) {}

suspended_task::suspended_task(suspended_task&& other)
    : resolver_(other.resolver_), ticket_(other.ticket_) {
    other.resolver_ = nullptr;
}

suspended_task::~suspended_task() {
    reset();
}

void suspended_task::resolve(bool resume_task) {
    if (resolver_) {
        // Move the ticket to the stack to guard against possible re-entrance
        // occurring as a side-effect of the task's own destructor running.
        resolver* cached_resolver = resolver_;
        ticket cached_ticket = ticket_;
        resolver_ = nullptr;
        cached_resolver->resolve_ticket(cached_ticket, resume_task);
    }
}

suspended_task& suspended_task::operator=(const suspended_task& other) {
    if (this != &other) {
        reset();
        resolver_ = other.resolver_;
        ticket_ = resolver_ ? resolver_->duplicate_ticket(other.ticket_) : 0;
    }
    return *this;
}

suspended_task& suspended_task::operator=(suspended_task&& other) {
    if (this != &other) {
        reset();
        resolver_ = other.resolver_;
        ticket_ = other.ticket_;
        other.resolver_ = nullptr;
    }
    return *this;
}

} // namespace fit

#endif // FIT_NO_STD_FOR_ZIRCON_USERSPACE