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/* Copyright (C) 1997,1999,2000,2001,2002,2003 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _AIO_MISC_H
#include <sysdep.h>
#if !defined __NR_io_setup || !defined __NR_io_destroy \
|| !defined __NR_io_getevents || !defined __NR_io_submit \
|| !defined __NR_io_cancel
#include <aio_misc.h>
#else
#define _AIO_MISC_H 1
#define USE_KAIO 1
#include <aio.h>
#include <pthread.h>
#include <stdint.h>
typedef unsigned long kctx_t;
#define KCTX_NONE ~0UL
extern kctx_t __aio_kioctx;
enum
{
IO_CMD_PREAD,
IO_CMD_PWRITE,
IO_CMD_FSYNC,
IO_CMD_FDSYNC,
IO_CMD_PREADX,
IO_CMD_POLL
};
struct kiocb
{
uint64_t kiocb_data;
uint64_t kiocb_key;
uint16_t kiocb_lio_opcode;
int16_t kiocb_req_prio;
uint32_t kiocb_fildes;
uint64_t kiocb_buf;
uint64_t kiocb_nbytes;
int64_t kiocb_offset;
int64_t __pad3, __pad4;
};
struct kio_event
{
uint64_t kioe_data;
uint64_t kioe_obj;
int64_t kioe_res;
int64_t kioe_res2;
};
/* Extend the operation enum. */
enum
{
LIO_DSYNC = LIO_NOP + 1,
LIO_SYNC,
LIO_READ64 = LIO_READ | 128,
LIO_WRITE64 = LIO_WRITE | 128,
LIO_KTHREAD = 0x10000,
LIO_KTHREAD_REQUIRED = 0x20000
};
/* Union of the two request types. */
typedef union
{
struct aiocb aiocb;
struct aiocb64 aiocb64;
} aiocb_union;
/* Used to synchronize. */
struct waitlist
{
struct waitlist *next;
pthread_cond_t *cond;
volatile int *counterp;
/* The next field is used in asynchronous `lio_listio' operations. */
struct sigevent *sigevp;
#ifdef BROKEN_THREAD_SIGNALS
/* XXX See requestlist, it's used to work around the broken signal
handling in Linux. */
pid_t caller_pid;
#endif
};
/* Status of a request. */
enum
{
no,
queued,
yes,
allocated,
done
};
/* Used to queue requests.. */
struct requestlist
{
struct kiocb kiocb;
kctx_t kioctx;
int running;
struct requestlist *last_fd;
struct requestlist *next_fd;
struct requestlist *next_prio;
struct requestlist *next_run;
/* For kioctx != KCTX_NONE requests we are doubly linked. */
#define prev_prio next_run
/* Pointer to the actual data. */
aiocb_union *aiocbp;
#ifdef BROKEN_THREAD_SIGNALS
/* PID of the initiator thread.
XXX This is only necessary for the broken signal handling on Linux. */
pid_t caller_pid;
#endif
/* 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_ctx (aiocb_union *aiocbp,
int operation,
kctx_t kctx)
attribute_hidden internal_function;
#define __aio_enqueue_request(aiocbp, operation) \
__aio_enqueue_request_ctx (aiocbp, operation | LIO_KTHREAD, KCTX_NONE)
/* Find request entry for given AIO control block. */
extern struct requestlist *__aio_find_req (aiocb_union *elem)
attribute_hidden internal_function;
/* Find request entry for given file descriptor. */
extern struct requestlist *__aio_find_req_fd (int fildes)
attribute_hidden internal_function;
/* Find request entry for given file descriptor. */
extern struct requestlist *__aio_find_kreq_fd (int fildes)
attribute_hidden internal_function;
/* Remove request from the list. */
extern void __aio_remove_request (struct requestlist *last,
struct requestlist *req, int all)
attribute_hidden internal_function;
extern void __aio_remove_krequest (struct requestlist *req)
attribute_hidden internal_function;
/* Release the entry for the request. */
extern void __aio_free_request (struct requestlist *req)
attribute_hidden internal_function;
/* Notify initiator of request and tell this everybody listening. */
extern void __aio_notify (struct requestlist *req)
attribute_hidden internal_function;
/* Notify initiator of request. */
#ifdef BROKEN_THREAD_SIGNALS
extern int __aio_notify_only (struct sigevent *sigev, pid_t caller_pid)
attribute_hidden internal_function;
#else
extern int __aio_notify_only (struct sigevent *sigev)
attribute_hidden internal_function;
#endif
/* Send the signal. */
extern int __aio_sigqueue (int sig, const union sigval val, pid_t caller_pid)
attribute_hidden internal_function;
extern int __aio_wait_for_events (kctx_t kctx, const struct timespec *timeout)
attribute_hidden internal_function;
extern void __aio_read_one_event (void) attribute_hidden internal_function;
extern int __aio_create_kernel_thread (void)
attribute_hidden internal_function;
extern int __have_no_kernel_aio attribute_hidden;
extern int __kernel_thread_started attribute_hidden;
#endif
#endif /* aio_misc.h */
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