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//
// Copyright 2017 Garrett D'Amore <garrett@damore.org>
//
// 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_AIO_H
#define PLATFORM_POSIX_AIO_H
// 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"
typedef struct nni_posix_aioq nni_posix_aioq;
typedef struct nni_posix_aiof nni_posix_aiof;
typedef struct nni_posix_aio_pipe nni_posix_aio_pipe;
typedef struct nni_posix_aio_ep nni_posix_aio_ep;
// Head structure representing file operations for read/write. We process
// the list of aios serially, and each file has its own thread for now.
struct nni_posix_aioq {
nni_list aq_aios;
int aq_fd;
nni_mtx aq_lk;
nni_cv aq_cv;
#ifdef NNG_USE_POSIX_AIOTHR
nni_thr aq_thr;
#endif
};
struct nni_posix_aio_pipe {
int ap_fd;
nni_posix_aioq ap_readq;
nni_posix_aioq ap_writeq;
};
struct nni_posix_aio_ep {
int ap_fd;
nni_posix_aioq ap_q;
};
extern int nni_posix_aio_pipe_init(nni_posix_aio_pipe *, int);
extern void nni_posix_aio_pipe_fini(nni_posix_aio_pipe *);
// extern int nni_posix_aio_ep_init(nni_posix_aio_ep *, int);
// extern void nni_posix_aio_ep_fini(nni_posix_aio_ep *);
extern int nni_posix_aio_read(nni_posix_aio_pipe *, nni_aio *);
extern int nni_posix_aio_write(nni_posix_aio_pipe *, nni_aio *);
// extern int nni_posix_aio_connect();
// extern int nni_posix_aio_accept();
#endif // PLATFORM_POSIX_AIO_H
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