aio.c revision 3470957343f37ed9baa957980891dbbe4c2d7092
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* The POSIX async. I/O functionality is
* implemented in libaio/common/posix_aio.c
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#pragma weak close = __posix_aio_close
#include "c_synonyms.h"
#include <aio.h>
#include <sys/types.h>
#include <errno.h>
#include <stdlib.h>
#include "pos4.h"
#include "sigev_thread.h"
extern int _libaio_close(int fd);
/*
* There is but one spawner for all aio operations.
*/
thread_communication_data_t *sigev_aio_tcd = NULL;
mutex_t sigev_aio_lock = DEFAULTMUTEX;
cond_t sigev_aio_cv = DEFAULTCV;
int sigev_aio_busy = 0;
static int
__sigev_thread_init(struct sigevent *sigevp)
{
thread_communication_data_t *tcdp;
int port;
int rc = 0;
(void) mutex_lock(&sigev_aio_lock);
while (sigev_aio_busy)
(void) cond_wait(&sigev_aio_cv, &sigev_aio_lock);
if ((tcdp = sigev_aio_tcd) != NULL)
port = tcdp->tcd_port;
else {
sigev_aio_busy = 1;
(void) mutex_unlock(&sigev_aio_lock);
tcdp = setup_sigev_handler(sigevp, AIO);
if (tcdp == NULL) {
port = -1;
rc = -1;
} else if (launch_spawner(tcdp) != 0) {
free_sigev_handler(tcdp);
tcdp = NULL;
port = -1;
rc = -1;
} else {
port = tcdp->tcd_port;
}
(void) mutex_lock(&sigev_aio_lock);
sigev_aio_tcd = tcdp;
sigev_aio_busy = 0;
(void) cond_broadcast(&sigev_aio_cv);
}
(void) mutex_unlock(&sigev_aio_lock);
sigevp->sigev_signo = port;
return (rc);
}
static int
__posix_sigev_thread(aiocb_t *aiocbp)
{
struct sigevent *sigevp;
if (aiocbp != NULL) {
sigevp = &aiocbp->aio_sigevent;
if (sigevp->sigev_notify == SIGEV_THREAD &&
sigevp->sigev_notify_function != NULL)
return (__sigev_thread_init(sigevp));
}
return (0);
}
#if !defined(_LP64)
static int
__posix_sigev_thread64(aiocb64_t *aiocbp)
{
struct sigevent *sigevp;
if (aiocbp != NULL) {
sigevp = &aiocbp->aio_sigevent;
if (sigevp->sigev_notify == SIGEV_THREAD &&
sigevp->sigev_notify_function != NULL)
return (__sigev_thread_init(sigevp));
}
return (0);
}
#endif
int
__posix_aio_close(int fd)
{
return (_libaio_close(fd));
}
int
aio_cancel(int fildes, aiocb_t *aiocbp)
{
return (__aio_cancel(fildes, aiocbp));
}
#if !defined(_LP64)
int
aio_cancel64(int fildes, aiocb64_t *aiocbp)
{
return (__aio_cancel64(fildes, aiocbp));
}
#endif
int
aio_error(const aiocb_t *aiocbp)
{
return (__aio_error(aiocbp));
}
#if !defined(_LP64)
int
aio_error64(const aiocb64_t *aiocbp)
{
return (__aio_error64(aiocbp));
}
#endif
int
aio_fsync(int op, aiocb_t *aiocbp)
{
int rc;
if ((rc = __posix_sigev_thread(aiocbp)) == 0)
rc = __aio_fsync(op, aiocbp);
return (rc);
}
#if !defined(_LP64)
int
aio_fsync64(int op, aiocb64_t *aiocbp)
{
int rc;
if ((rc = __posix_sigev_thread64(aiocbp)) == 0)
rc = __aio_fsync64(op, aiocbp);
return (rc);
}
#endif
int
aio_read(aiocb_t *aiocbp)
{
int rc;
if ((rc = __posix_sigev_thread(aiocbp)) == 0)
rc = __aio_read(aiocbp);
return (rc);
}
#if !defined(_LP64)
int
aio_read64(aiocb64_t *aiocbp)
{
int rc;
if ((rc = __posix_sigev_thread64(aiocbp)) == 0)
rc = __aio_read64(aiocbp);
return (rc);
}
#endif
ssize_t
aio_return(aiocb_t *aiocbp)
{
return (__aio_return(aiocbp));
}
#if !defined(_LP64)
ssize_t
aio_return64(aiocb64_t *aiocbp)
{
return (__aio_return64(aiocbp));
}
#endif
int
aio_suspend(const aiocb_t * const list[], int nent,
const timespec_t *timeout)
{
return (__aio_suspend((void **)list, nent, timeout, 0));
}
#if !defined(_LP64)
int
aio_suspend64(const aiocb64_t * const list[], int nent,
const timespec_t *timeout)
{
return (__aio_suspend((void **)list, nent, timeout, 1));
}
#endif
int
aio_write(aiocb_t *aiocbp)
{
int rc;
if ((rc = __posix_sigev_thread(aiocbp)) == 0)
rc = __aio_write(aiocbp);
return (rc);
}
#if !defined(_LP64)
int
aio_write64(aiocb64_t *aiocbp)
{
int rc;
if ((rc = __posix_sigev_thread64(aiocbp)) == 0)
rc = __aio_write64(aiocbp);
return (rc);
}
#endif
int
lio_listio(int mode,
aiocb_t *_RESTRICT_KYWD const *_RESTRICT_KYWD list,
int nent, struct sigevent *_RESTRICT_KYWD sigevp)
{
int i;
aiocb_t *aiocbp;
for (i = 0; i < nent; i++) {
if ((aiocbp = list[i]) != NULL &&
aiocbp->aio_sigevent.sigev_notify == SIGEV_THREAD &&
__posix_sigev_thread(aiocbp) != 0)
return (-1);
}
if (sigevp != NULL &&
sigevp->sigev_notify == SIGEV_THREAD &&
sigevp->sigev_notify_function != NULL &&
__sigev_thread_init(sigevp) != 0)
return (-1);
return (__lio_listio(mode, list, nent, sigevp));
}
#if !defined(_LP64)
int
lio_listio64(int mode,
aiocb64_t *_RESTRICT_KYWD const *_RESTRICT_KYWD list,
int nent, struct sigevent *_RESTRICT_KYWD sigevp)
{
int i;
aiocb64_t *aiocbp;
for (i = 0; i < nent; i++) {
if ((aiocbp = list[i]) != NULL &&
aiocbp->aio_sigevent.sigev_notify == SIGEV_THREAD &&
__posix_sigev_thread64(aiocbp) != 0)
return (-1);
}
if (sigevp != NULL &&
sigevp->sigev_notify == SIGEV_THREAD &&
sigevp->sigev_notify_function != NULL &&
__sigev_thread_init(sigevp) != 0)
return (-1);
return (__lio_listio64(mode, list, nent, sigevp));
}
#endif
int
aio_waitn(aiocb_t *list[], uint_t nent, uint_t *nwait,
const timespec_t *timeout)
{
return (__aio_waitn((void **)list, nent, nwait, timeout));
}
#if !defined(_LP64)
int
aio_waitn64(aiocb64_t *list[], uint_t nent, uint_t *nwait,
const timespec_t *timeout)
{
return (__aio_waitn((void **)list, nent, nwait, timeout));
}
#endif