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/**
* Copyright (c) 2022, Timothy Stack
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Timothy Stack nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef lnav_pollable_hh
#define lnav_pollable_hh
#include <memory>
#include <vector>
#include <poll.h>
#include "base/bus.hh"
class pollable_supervisor;
class pollable {
public:
enum class category {
background,
interactive,
};
pollable(std::shared_ptr<pollable_supervisor> supervisor, category cat);
pollable(const pollable&) = delete;
virtual ~pollable();
category get_category() const { return this->p_category; }
virtual void update_poll_set(std::vector<struct pollfd>& pollfds) = 0;
virtual void check_poll_set(const std::vector<struct pollfd>& pollfds) = 0;
private:
std::shared_ptr<pollable_supervisor> p_supervisor;
const category p_category;
};
class pollable_supervisor : public bus<pollable> {
public:
struct update_result {
size_t ur_background{0};
size_t ur_interactive{0};
};
update_result update_poll_set(std::vector<struct pollfd>& pollfds);
void check_poll_set(const std::vector<struct pollfd>& pollfds);
size_t count(pollable::category cat);
};
short pollfd_revents(const std::vector<struct pollfd>& pollfds, int fd);
bool pollfd_ready(const std::vector<struct pollfd>& pollfds,
int fd,
short events = POLLIN | POLLHUP);
#endif
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