178 lines
6.4 KiB
C
178 lines
6.4 KiB
C
/****************************************************************************
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* include/aio.h
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_AIO_H
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#define __INCLUDE_AIO_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <time.h>
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#include <nuttx/wqueue.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* Work queue support is required. In the flat, embedded build the low-
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* priority work queue is required so that the asynchronous I/O does not
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* interfere with high priority driver operations. In the protected and
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* kernel mode builds, user-space work queue support is required. If these
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* pre-requisites are met, then asynchronous I/O support can be enabled with
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* CONFIG_LIBC_AIO
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*/
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#ifdef CONFIG_LIBC_AIO
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#ifndef CONFIG_SCHED_WORKQUEUE
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# error Asynchronous I/O requiresCONFIG_SCHED_WORKQUEUE
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#else
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# if defined (CONFIG_BUILD_PROTECTED) || defined(CONFIG_BUILD_KERNEL)
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# ifndef CONFIG_SCHED_USRWORK
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# error User-space asynchronous I/O requires CONFIG_SCHED_USRWORK
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# endif
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# else
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# ifndef CONFIG_SCHED_LPWORK
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# error Flat-build asynchronous I/O requires CONFIG_SCHED_LPWORK
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# endif
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# endif
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#endif
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/* Standard Definitions *****************************************************/
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/* aio_cancel return values
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*
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* AIO_ALLDONE - Indicates that none of the requested operations could
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* be cancelled since they are already complete.
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* AIO_CANCELED - Indicates that all requested operations have been
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* cancelled.
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* AIO_NOTCANCELED - Indicates that some of the requested operations could
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* not be cancelled since they are in progress.
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*/
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#define AIO_CANCELED 0
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#define AIO_ALLDONE 1
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#define AIO_NOTCANCELED 2
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/* lio_listio element operations
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*
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* LIO_NOP - Indicates that no transfer is requested.
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* LIO_READ - Requests a read operation.
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* LIO_WRITE - Requests a write operation.
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*/
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#define LIO_NOP 0
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#define LIO_READ 1
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#define LIO_WRITE 2
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/* lio_listio modes
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*
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* LIO_NOWAIT - Indicates that the calling thread is to continue
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* execution while the lio_listio() operation is being
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* performed, and no notification is given when the
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* operation is complete.
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* LIO_WAIT - Indicates that the calling thread is to suspend until
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* the lio_listio() operation is complete.
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*/
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#define LIO_NOWAIT 0
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#define LIO_WAIT 1
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/****************************************************************************
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* Type Definitions
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****************************************************************************/
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struct aiocb
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{
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/* Standard fields required by POSIX */
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struct sigevent aio_sigevent; /* Signal number and value */
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FAR volatile void *aio_buf; /* Location of buffer */
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off_t aio_offset; /* File offset */
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size_t aio_nbytes; /* Length of transfer */
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int aio_fildes; /* File descriptor */
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int aio_reqprio; /* Request priority offset */
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int aio_lio_opcode; /* Operation to be performed */
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/* Non-standard, implementation-dependent data */
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struct work_s aio_work; /* Used to defer I/O to the work thread */
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pid_t aio_pid; /* ID of client to be notify at completion */
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ssize_t aio_result; /* Support aio_error() and aio_return() */
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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int aio_cancel(int, FAR struct aiocb *aiocbp);
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int aio_error(FAR const struct aiocb *aiocbp);
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int aio_fsync(int, FAR struct aiocb *aiocbp);
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int aio_read(FAR struct aiocb *aiocbp);
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ssize_t aio_return(FAR struct aiocb *aiocbp);
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int aio_suspend(FAR const struct aiocb *const list[], int nent,
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FAR const struct timespec *timeout);
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int aio_write(FAR struct aiocb *aiocbp);
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#ifndef CONFIG_PTHREAD_DISABLE
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int lio_listio(int mode, FAR struct aiocb *const list[], int nent,
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FAR struct sigevent *sig);
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_LIBC_AIO */
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#endif /* __INCLUDE_AIO_H */
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