a64869aa67
Squashed commit of the following:
configs/: The few configurations that formerly set CONFIG_NFILE_DESCRIPTORS=0 should not default, rather they should set the number of descriptors to 3.
fs/: Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
tools/: Tools updates for changes to usage of CONFIG_NFILE_DESCRIPTORS.
syscall/: Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
libs/: Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
include/: Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
drivers/: Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
Documentation/: Remove all references to CONFIG_NFILE_DESCRIPTORS == 0
binfmt/: Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
arch/: Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
net/: Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
sched/: Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
sched/Kconfig: CONFIG_NFILE_DESCRIPTORS may no longer to set to a value less than 3
configs/: Remove all settings for CONFIG_NFILE_DESCRIPTORS < 3
277 lines
8.9 KiB
C
277 lines
8.9 KiB
C
/****************************************************************************
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* fs/aio/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 __FS_AIO_AIO_H
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#define __FS_AIO_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 <string.h>
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#include <aio.h>
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#include <queue.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/net/net.h>
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#ifdef CONFIG_FS_AIO
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* Number of pre-allocated AIO Control block containers */
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#ifndef CONFIG_FS_NAIOC
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# define CONFIG_FS_NAIOC 8
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#endif
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#undef AIO_HAVE_PSOCK
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#if defined(CONFIG_NET_TCP) && CONFIG_NSOCKET_DESCRIPTORS > 0
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# define AIO_HAVE_PSOCK
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This structure contains one AIO control block and appends information
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* needed by the logic running on the worker thread. These structures are
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* pre-allocated, the number pre-allocated controlled by CONFIG_FS_NAIOC.
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*/
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struct file;
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struct aio_container_s
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{
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dq_entry_t aioc_link; /* Supports a doubly linked list */
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FAR struct aiocb *aioc_aiocbp; /* The contained AIO control block */
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union
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{
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FAR struct file *aioc_filep; /* File structure to use with the I/O */
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#ifdef AIO_HAVE_PSOCK
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FAR struct socket *aioc_psock; /* Socket structure to use with the I/O */
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#endif
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FAR void *ptr; /* Generic pointer to FAR data */
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} u;
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struct work_s aioc_work; /* Used to defer I/O to the work thread */
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pid_t aioc_pid; /* ID of the waiting task */
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#ifdef CONFIG_PRIORITY_INHERITANCE
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uint8_t aioc_prio; /* Priority of the waiting task */
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#endif
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#undef EXTERN
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#if defined(__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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/* This is a list of pending asynchronous I/O. The user must hold the
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* lock on this list in order to access the list.
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*/
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EXTERN dq_queue_t g_aio_pending;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: aio_initialize
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*
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* Description:
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* Perform one-time initialization of the asynchronous I/O sub-system
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void aio_initialize(void);
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/****************************************************************************
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* Name: aio_lock/aio_unlock
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*
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* Description:
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* Take/give the lock on the pending asynchronous I/O list. These locks
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* are implemented with re-entrant semaphores -- deadlocks will not occur
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* if the lock is taken multiple times on the same thread.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void aio_lock(void);
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void aio_unlock(void);
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/****************************************************************************
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* Name: aioc_alloc
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*
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* Description:
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* Allocate a new AIO container by taking the next, pre-allocated
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* container from the free list. This function will wait until
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* aioc_free() is called in the event that there is no free container
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* available in the free list.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* A reference to the allocated AIO container. This allocation never
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* fails because the logic will wait in the event that there is no free
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* container.
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*
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****************************************************************************/
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FAR struct aio_container_s *aioc_alloc(void);
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/****************************************************************************
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* Name: aioc_free
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*
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* Description:
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* Free an AIO container by returning it to the free list and, perhaps,
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* awakening any threads waiting for that resource
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*
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* Input Parameters:
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* aioc - The AIO container to be free
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void aioc_free(FAR struct aio_container_s *aioc);
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/****************************************************************************
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* Name: aio_contain
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*
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* Description:
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* Create and initialize a container for the provided AIO control block
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*
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* Input Parameters:
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* aiocbp - The AIO control block pointer
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*
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* Returned Value:
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* A reference to the new AIO control block container. This function
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* will not fail but will wait if necessary for the resources to perform
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* this operation. NULL will be returned on certain errors with the
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* errno value already set appropriately.
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*
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****************************************************************************/
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FAR struct aio_container_s *aio_contain(FAR struct aiocb *aiocbp);
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/****************************************************************************
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* Name: aioc_decant
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*
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* Description:
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* Remove the AIO control block from the container and free all resources
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* used by the container.
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*
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* Input Parameters:
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* aioc - Pointer to the AIO control block container
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*
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* Returned Value:
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* A pointer to the no-longer contained AIO control block.
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*
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****************************************************************************/
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FAR struct aiocb *aioc_decant(FAR struct aio_container_s *aioc);
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/****************************************************************************
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* Name: aio_queue
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*
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* Description:
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* Schedule the asynchronous I/O on the low priority work queue
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*
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* Input Parameters:
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* arg - Worker argument. In this case, a pointer to an instance of
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* struct aiocb cast to void *.
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*
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* Returned Value:
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* Zero (OK) on success. Otherwise, -1 is returned and the errno is set
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* appropriately.
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*
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****************************************************************************/
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int aio_queue(FAR struct aio_container_s *aioc, worker_t worker);
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/****************************************************************************
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* Name: aio_signal
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*
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* Description:
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* Signal the client that an I/O has completed.
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*
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* Input Parameters:
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* pid - ID of the task to signal
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* aiocbp - Pointer to the asynchronous I/O state structure that includes
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* information about how to signal the client
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*
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* Returned Value:
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* Zero (OK) if the client was successfully signalled. Otherwise, a
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* negated errno value is returned.
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*
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****************************************************************************/
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int aio_signal(pid_t pid, FAR struct aiocb *aiocbp);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* CONFIG_FS_AIO */
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#endif /* __FS_AIO_AIO_H */
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