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/* Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _AIO_MISC_H
#define _AIO_MISC_H 1
#include <aio.h>
#include <pthread.h>
/* Extend the operation enum. */
enum
{
LIO_DSYNC = LIO_NOP + 1,
LIO_SYNC,
LIO_READ64 = LIO_READ | 128,
LIO_WRITE64 = LIO_WRITE | 128
};
/* Union of the two request types. */
typedef union
{
struct aiocb aiocb;
struct aiocb64 aiocb64;
} aiocb_union;
/* Used to synchronize. */
struct waitlist
{
struct waitlist *next;
/* The next two fields is used in synchronous `lio_listio' operations. */
#ifndef DONT_NEED_AIO_MISC_COND
pthread_cond_t *cond;
#endif
int *result;
volatile unsigned int *counterp;
/* The next field is used in asynchronous `lio_listio' operations. */
struct sigevent *sigevp;
};
/* Status of a request. */
enum
{
no,
queued,
yes,
allocated,
done
};
/* Used to queue requests.. */
struct requestlist
{
int running;
struct requestlist *last_fd;
struct requestlist *next_fd;
struct requestlist *next_prio;
struct requestlist *next_run;
/* Pointer to the actual data. */
aiocb_union *aiocbp;
/* List of waiting processes. */
struct waitlist *waiting;
};
/* Lock for global I/O list of requests. */
extern pthread_mutex_t __aio_requests_mutex attribute_hidden;
/* Enqueue request. */
extern struct requestlist *__aio_enqueue_request (aiocb_union *aiocbp,
int operation)
attribute_hidden;
/* Find request entry for given AIO control block. */
extern struct requestlist *__aio_find_req (aiocb_union *elem) attribute_hidden;
/* Find request entry for given file descriptor. */
extern struct requestlist *__aio_find_req_fd (int fildes) attribute_hidden;
/* Remove request from the list. */
extern void __aio_remove_request (struct requestlist *last,
struct requestlist *req, int all)
attribute_hidden;
/* Release the entry for the request. */
extern void __aio_free_request (struct requestlist *req) attribute_hidden;
/* Notify initiator of request and tell this everybody listening. */
extern void __aio_notify (struct requestlist *req) attribute_hidden;
/* Notify initiator of request. */
extern int __aio_notify_only (struct sigevent *sigev) attribute_hidden;
/* Send the signal. */
extern int __aio_sigqueue (int sig, const union sigval val, pid_t caller_pid)
attribute_hidden;
#endif /* aio_misc.h */
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