aio.c revision 156136
1156136Sdavidxu/* 2156136Sdavidxu * Copyright (c) 2005 David Xu <davidxu@freebsd.org> 3156136Sdavidxu * All rights reserved. 4156136Sdavidxu * 5156136Sdavidxu * Redistribution and use in source and binary forms, with or without 6156136Sdavidxu * modification, are permitted provided that the following conditions 7156136Sdavidxu * are met: 8156136Sdavidxu * 1. Redistributions of source code must retain the above copyright 9156136Sdavidxu * notice unmodified, this list of conditions, and the following 10156136Sdavidxu * disclaimer. 11156136Sdavidxu * 2. Redistributions in binary form must reproduce the above copyright 12156136Sdavidxu * notice, this list of conditions and the following disclaimer in the 13156136Sdavidxu * documentation and/or other materials provided with the distribution. 14156136Sdavidxu * 15156136Sdavidxu * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16156136Sdavidxu * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17156136Sdavidxu * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18156136Sdavidxu * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19156136Sdavidxu * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20156136Sdavidxu * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21156136Sdavidxu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22156136Sdavidxu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23156136Sdavidxu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24156136Sdavidxu * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25156136Sdavidxu * 26156136Sdavidxu * $FreeBSD: head/lib/librt/aio.c 156136 2006-03-01 06:37:34Z davidxu $ 27156136Sdavidxu * 28156136Sdavidxu */ 29156136Sdavidxu 30156136Sdavidxu#include <sys/cdefs.h> 31156136Sdavidxu#include <sys/types.h> 32156136Sdavidxu#include <sys/syscall.h> 33156136Sdavidxu#include <sys/aio.h> 34156136Sdavidxu 35156136Sdavidxu#include "namespace.h" 36156136Sdavidxu#include <errno.h> 37156136Sdavidxu#include <pthread.h> 38156136Sdavidxu#include <stddef.h> 39156136Sdavidxu#include <signal.h> 40156136Sdavidxu#include <unistd.h> 41156136Sdavidxu#include "sigev_thread.h" 42156136Sdavidxu#include "un-namespace.h" 43156136Sdavidxu 44156136Sdavidxu__weak_reference(__aio_read, _aio_read); 45156136Sdavidxu__weak_reference(__aio_read, aio_read); 46156136Sdavidxu__weak_reference(__aio_write, _aio_write); 47156136Sdavidxu__weak_reference(__aio_write, aio_write); 48156136Sdavidxu__weak_reference(__aio_return, _aio_return); 49156136Sdavidxu__weak_reference(__aio_return, aio_return); 50156136Sdavidxu__weak_reference(__aio_waitcomplete, _aio_waitcomplete); 51156136Sdavidxu__weak_reference(__aio_waitcomplete, aio_waitcomplete); 52156136Sdavidxu 53156136Sdavidxutypedef void (*aio_func)(union sigval val, struct aiocb *iocb); 54156136Sdavidxu 55156136Sdavidxuextern int __sys_aio_read(struct aiocb *iocb); 56156136Sdavidxuextern int __sys_aio_write(struct aiocb *iocb); 57156136Sdavidxuextern int __sys_aio_waitcomplete(struct aiocb **iocbp, struct timespec *timeout); 58156136Sdavidxuextern int __sys_aio_return(struct aiocb *iocb); 59156136Sdavidxuextern int __sys_aio_error(struct aiocb *iocb); 60156136Sdavidxu 61156136Sdavidxustatic void 62156136Sdavidxuaio_dispatch(struct sigev_node *sn, siginfo_t *si) 63156136Sdavidxu{ 64156136Sdavidxu aio_func f = sn->sn_func; 65156136Sdavidxu 66156136Sdavidxu f(sn->sn_value, (struct aiocb *)sn->sn_id); 67156136Sdavidxu} 68156136Sdavidxu 69156136Sdavidxustatic int 70156136Sdavidxuaio_io(struct aiocb *iocb, int (*sysfunc)(struct aiocb *iocb)) 71156136Sdavidxu{ 72156136Sdavidxu struct sigev_node *sn; 73156136Sdavidxu struct sigevent saved_ev; 74156136Sdavidxu int ret; 75156136Sdavidxu 76156136Sdavidxu if (iocb->aio_sigevent.sigev_notify != SIGEV_THREAD) { 77156136Sdavidxu ret = sysfunc(iocb); 78156136Sdavidxu return (ret); 79156136Sdavidxu } 80156136Sdavidxu 81156136Sdavidxu if (__sigev_check_init()) { 82156136Sdavidxu /* This might be that thread library is not enabled. */ 83156136Sdavidxu errno = EINVAL; 84156136Sdavidxu return (-1); 85156136Sdavidxu } 86156136Sdavidxu 87156136Sdavidxu sn = __sigev_alloc(SI_ASYNCIO, &iocb->aio_sigevent); 88156136Sdavidxu if (sn == NULL) { 89156136Sdavidxu errno = EAGAIN; 90156136Sdavidxu return (-1); 91156136Sdavidxu } 92156136Sdavidxu 93156136Sdavidxu saved_ev = iocb->aio_sigevent; 94156136Sdavidxu sn->sn_id = (sigev_id_t)iocb; 95156136Sdavidxu sn->sn_flags |= SNF_ONESHOT; 96156136Sdavidxu __sigev_get_sigevent(sn, &iocb->aio_sigevent, sn->sn_id); 97156136Sdavidxu 98156136Sdavidxu __sigev_list_lock(); 99156136Sdavidxu __sigev_register(sn); 100156136Sdavidxu __sigev_list_unlock(); 101156136Sdavidxu 102156136Sdavidxu sn->sn_dispatch = aio_dispatch; 103156136Sdavidxu ret = sysfunc(iocb); 104156136Sdavidxu iocb->aio_sigevent = saved_ev; 105156136Sdavidxu 106156136Sdavidxu if (ret != 0) { 107156136Sdavidxu __sigev_list_lock(); 108156136Sdavidxu __sigev_delete_node(sn); 109156136Sdavidxu __sigev_list_unlock(); 110156136Sdavidxu } 111156136Sdavidxu return (ret); 112156136Sdavidxu} 113156136Sdavidxu 114156136Sdavidxuint 115156136Sdavidxu__aio_read(struct aiocb *iocb) 116156136Sdavidxu{ 117156136Sdavidxu return aio_io(iocb, &__sys_aio_read); 118156136Sdavidxu} 119156136Sdavidxu 120156136Sdavidxuint 121156136Sdavidxu__aio_write(struct aiocb *iocb) 122156136Sdavidxu{ 123156136Sdavidxu return aio_io(iocb, &__sys_aio_write); 124156136Sdavidxu} 125156136Sdavidxu 126156136Sdavidxuint 127156136Sdavidxu__aio_waitcomplete(struct aiocb **iocbp, struct timespec *timeout) 128156136Sdavidxu{ 129156136Sdavidxu int ret = __sys_aio_waitcomplete(iocbp, timeout); 130156136Sdavidxu 131156136Sdavidxu if (*iocbp) { 132156136Sdavidxu if ((*iocbp)->aio_sigevent.sigev_notify == SIGEV_THREAD) { 133156136Sdavidxu __sigev_list_lock(); 134156136Sdavidxu __sigev_delete(SI_ASYNCIO, (sigev_id_t)(*iocbp)); 135156136Sdavidxu __sigev_list_unlock(); 136156136Sdavidxu } 137156136Sdavidxu } 138156136Sdavidxu 139156136Sdavidxu return (ret); 140156136Sdavidxu} 141156136Sdavidxu 142156136Sdavidxuint 143156136Sdavidxu__aio_return(struct aiocb *iocb) 144156136Sdavidxu{ 145156136Sdavidxu int ret = __sys_aio_return(iocb); 146156136Sdavidxu int err = __sys_aio_error(iocb); 147156136Sdavidxu 148156136Sdavidxu if (err != EINPROGRESS && 149156136Sdavidxu iocb->aio_sigevent.sigev_notify == SIGEV_THREAD) { 150156136Sdavidxu __sigev_list_lock(); 151156136Sdavidxu __sigev_delete(SI_ASYNCIO, (sigev_id_t)iocb); 152156136Sdavidxu __sigev_list_unlock(); 153156136Sdavidxu } 154156136Sdavidxu 155156136Sdavidxu return (ret); 156156136Sdavidxu} 157