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//
// Copyright 2017 Garrett D'Amore <garrett@damore.org>
// Copyright 2017 Capitar IT Group BV <info@capitar.com>
//
// This software is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
#ifndef PLATFORM_POSIX_POLLQ_H
#define PLATFORM_POSIX_POLLQ_H
#ifdef NNG_PLATFORM_POSIX
// This file defines structures we will use for emulating asynchronous I/O
// on POSIX. POSIX lacks the support for callback based asynchronous I/O
// that we have on Windows, although it has a non-widely support aio layer
// that is not very performant on many systems. So we emulate this using
// one of several possible different backends.
#include "core/nng_impl.h"
#include <poll.h>
typedef struct nni_posix_pollq_node nni_posix_pollq_node;
typedef struct nni_posix_pollq nni_posix_pollq;
struct nni_posix_pollq_node {
nni_list_node node; // linkage into the pollq list
nni_posix_pollq *pq; // associated pollq
int index; // used by the poller impl
int armed; // used by the poller impl
int fd; // file descriptor to poll
int events; // events to watch for
int revents; // events received
void * data; // user data
nni_cb cb; // user callback on event
};
extern nni_posix_pollq *nni_posix_pollq_get(int);
extern int nni_posix_pollq_sysinit(void);
extern void nni_posix_pollq_sysfini(void);
extern int nni_posix_pollq_add(nni_posix_pollq *, nni_posix_pollq_node *);
extern void nni_posix_pollq_remove(nni_posix_pollq_node *);
extern void nni_posix_pollq_arm(nni_posix_pollq_node *, int);
extern void nni_posix_pollq_disarm(nni_posix_pollq_node *, int);
#endif // NNG_PLATFORM_POSIX
#endif // PLATFORM_POSIX_POLLQ_H
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