pollset.hpp

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/* SPDX-License-Identifier: MPL-2.0 */
 
#ifndef __ZMQ_POLLSET_HPP_INCLUDED__
#define __ZMQ_POLLSET_HPP_INCLUDED__
 
//  poller.hpp decides which polling mechanism to use.
#include "poller.hpp"
#if defined ZMQ_IOTHREAD_POLLER_USE_POLLSET
 
#include <sys/poll.h>
#include <sys/pollset.h>
#include <vector>
 
#include "ctx.hpp"
#include "fd.hpp"
#include "thread.hpp"
#include "poller_base.hpp"
 
namespace zmq
{
struct i_poll_events;
 
//  This class implements socket polling mechanism using the AIX-specific
//  pollset mechanism.
 
class pollset_t ZMQ_FINAL : public poller_base_t
{
  public:
    typedef void *handle_t;
 
    pollset_t (const thread_ctx_t &ctx_);
    ~pollset_t () ZMQ_FINAL;
 
    //  "poller" concept.
    handle_t add_fd (fd_t fd_, zmq::i_poll_events *events_);
    void rm_fd (handle_t handle_);
    void set_pollin (handle_t handle_);
    void reset_pollin (handle_t handle_);
    void set_pollout (handle_t handle_);
    void reset_pollout (handle_t handle_);
    void start ();
    void stop ();
 
    static int max_fds ();
 
  private:
    //  Main worker thread routine.
    static void worker_routine (void *arg_);
 
    //  Main event loop.
    void loop () ZMQ_FINAL;
 
    // Reference to ZMQ context.
    const thread_ctx_t &ctx;
 
    //  Main pollset file descriptor
    ::pollset_t pollset_fd;
 
    struct poll_entry_t
    {
        fd_t fd;
        bool flag_pollin;
        bool flag_pollout;
        zmq::i_poll_events *events;
    };
 
    //  List of retired event sources.
    typedef std::vector<poll_entry_t *> retired_t;
    retired_t retired;
 
    //  This table stores data for registered descriptors.
    typedef std::vector<poll_entry_t *> fd_table_t;
    fd_table_t fd_table;
 
    //  If true, thread is in the process of shutting down.
    bool stopping;
 
    //  Handle of the physical thread doing the I/O work.
    thread_t worker;
 
    ZMQ_NON_COPYABLE_NOR_MOVABLE (pollset_t)
};
 
typedef pollset_t poller_t;
}
 
#endif
 
#endif