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glibc/sysdeps/pthread/aio_misc.h
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/* Copyright (C) 1997, 1999, 2000, 2001, 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 | |
#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; | |
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 | |
{ | |
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; | |
#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 (aiocb_union *aiocbp, | |
int operation) | |
attribute_hidden internal_function; | |
/* 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; | |
/* Remove request from the list. */ | |
extern void __aio_remove_request (struct requestlist *last, | |
struct requestlist *req, int all) | |
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; | |
#endif /* aio_misc.h */ |