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Initiail implementation of lio_listio() and rethinking of signal logic

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This commit is contained in:
Gregory Nutt 2014-10-05 11:43:42 -06:00
parent eeaae40d0c
commit 9a1b011178
6 changed files with 747 additions and 68 deletions
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8
include/aio.h
View File

@ -134,8 +134,8 @@ struct aiocb
off_t aio_offset; /* File offset */
size_t aio_nbytes; /* Length of transfer */
int aio_fildes; /* File descriptor */
int aio_reqprio; /* Request priority offset */
int aio_lio_opcode; /* Operation to be performed */
int8_t aio_reqprio; /* Request priority offset */
uint8_t aio_lio_opcode; /* Operation to be performed */
/* Non-standard, implementation-dependent data. For portability reasons,
* application code should never reference these elements.
@ -144,6 +144,7 @@ struct aiocb
struct work_s aio_work; /* Used to defer I/O to the work thread */
pid_t aio_pid; /* ID of client to be notify at completion */
volatile ssize_t aio_result; /* Support for aio_error() and aio_return() */
FAR void *aio_priv; /* Used by signal handlers */
};
/****************************************************************************
@ -170,11 +171,8 @@ ssize_t aio_return(FAR struct aiocb *aiocbp);
int aio_suspend(FAR const struct aiocb *const list[], int nent,
FAR const struct timespec *timeout);
int aio_write(FAR struct aiocb *aiocbp);
#ifndef CONFIG_PTHREAD_DISABLE /* Depends on pthread support */
int lio_listio(int mode, FAR struct aiocb *const list[], int nent,
FAR struct sigevent *sig);
#endif
#undef EXTERN
#ifdef __cplusplus

6
libc/aio/Make.defs
View File

@ -38,11 +38,7 @@ ifeq ($(CONFIG_LIBC_AIO),y)
# Add the asynchronous I/O C files to the build
CSRCS += aio_cancel.c aio_error.c aio_fsync.c aio_read.c aio_return.c
CSRCS += aio_signal.c aio_suspend.c aio_write.c
ifneq ($(CONFIG_PTHREAD_DISABLE),y)
CSRCS += lio_listio.c
endif
CSRCS += aio_signal.c aio_suspend.c aio_write.c lio_listio.c
# Add the asynchronous I/O directory to the build

227
libc/aio/aio_fsync.c Normal file
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@ -0,0 +1,227 @@
/****************************************************************************
* libc/aio/aio_fsync.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <unistd.h>
#include <aio.h>
#include <assert.h>
#include <errno.h>
#include <nuttx/wqueue.h>
#include "lib_internal.h"
#include "aio/aio.h"
#ifndef CONFIG_LIBC_AIO
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Variables
****************************************************************************/
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: aio_fsync_worker
*
* Description:
* This function executes on the worker thread and performs the
* asynchronous I/O operation.
*
* Input Parameters:
* arg - Worker argument. In this case, a pointer to an instance of
* struct aiocb cast to void *.
*
* Returned Value:
* None
*
****************************************************************************/
static void aio_fsync_worker(FAR void *arg)
{
FAR struct aiocb *aiocbp = (FAR struct aiocb *)arg;
DEBASSERT(arg);
int ret;
/* Perform the fsync using aio_fildes */
ret = fsync(aiocbp->aio_fildes);
if (ret < 0)
{
int errcode = get_errno();
fdbg("ERROR: fsync failed: %d\n", errode);
DEBUGASSERT(errcode > 0);
aicbp->result = -errcode;
}
else
{
aicbp->result = OK;
}
/* Signal the client */
(void)aio_signal(aiocbp);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: aio_fsync
*
* Description:
* The aio_fsync() function asynchronously forces all I/O operations
* associated with the file indicated by the file descriptor aio_fildes
* member of the aiocb structure referenced by the aiocbp argument and
* queued at the time of the call to aio_fsync() to the synchronized
* I/O completion state. The function call will return when the
* synchronization request has been initiated or queued to the file or
* device (even when the data cannot be synchronized immediately).
*
* If op is O_DSYNC, all currently queued I/O operations will be
* completed as if by a call to fdatasync(); that is, as defined for
* synchronized I/O data integrity completion. If op is O_SYNC, all
* currently queued I/O operations will be completed as if by a call to
* fsync(); that is, as defined for synchronized I/O file integrity
* completion. If the aio_fsync() function fails, or if the operation
* queued by aio_fsync() fails, then, as for fsync() and fdatasync(),
* outstanding I/O operations are not guaranteed to have been completed.
* [See "POSIX Compliance" below]
*
* If aio_fsync() succeeds, then it is only the I/O that was queued at
* the time of the call to aio_fsync() that is guaranteed to be forced
* to the relevant completion state. The completion of subsequent I/O
* on the file descriptor is not guaranteed to be completed in a
* synchronized fashion.
*
* The aiocbp argument refers to an asynchronous I/O control block. The
* aiocbp value may be used as an argument to aio_error() and aio_return()
* in order to determine the error status and return status, respectively,
* of the asynchronous operation while it is proceeding. When the request
* is queued, the error status for the operation is [EINPROGRESS]. When
* all data has been successfully transferred, the error status will be
* reset to reflect the success or failure of the operation. If the
* operation does not complete successfully, the error status for the
* operation will be set to indicate the error. The aio_sigevent member
* determines the asynchronous notification to occur when all operations
* have achieved synchronized I/O completion. All other members of the
* structure referenced by aiocbp are ignored. If the control block
* referenced by aiocbp becomes an illegal address prior to asynchronous
* I/O completion, then the behavior is undefined.
*
* If the aio_fsync() function fails or aiocbp indicates an error condition,
* data is not guaranteed to have been successfully transferred.
*
* Input Parameters:
* op - Should be either O_SYNC or O_DSYNC. Ignored in this implementation.
* aiocbp - A pointer to an instance of struct aiocb
*
* Returned Value:
* The aio_fsync() function will return the value 0 if the I/O operation is
* successfully queued; otherwise, the function will return the value -1 and
* set errno to indicate the error.
*
* The aio_fsync() function will fail if:
*
* EAGAIN - The requested asynchronous operation was not queued due to
* temporary resource limitations.
* EBADF - The aio_fildes member of the aiocb structure referenced by
* the aiocbp argument is not a valid file descriptor open for writing.
* EINVAL - This implementation does not support synchronized I/O for
* this file.
* EINVAL - A value of op other than O_DSYNC or O_SYNC was specified.
*
* In the event that any of the queued I/O operations fail, aio_fsync()
* will return the error condition defined for read() and write(). The
* error is returned in the error status for the asynchronous fsync()
* operation, which can be retrieved using aio_error().
*
* POSIX Compliance
* - NuttX does not currently make any distinction between O_DYSNC and O_SYNC.
* Hence, the 'op' argument is ignored altogether.
* - Most errors required in the standard are not detected at this point.
* There are no pre-queuing checks for the validity of the operation.
*
****************************************************************************/
int aio_fsync(int op, FAR struct aiocb *aiocbp)
{
int ret;
DEBUGASSERT(op == O_SYNC /* || op == O_DSYNC */);
DEBUGASSERT(aiocbp);
/* The result -EINPROGRESS means that the transfer has not yet completed */
aiocbp->aio_result = -EINPROGRESS;
/* Save the ID of the calling, client thread */
aiocbp->aio_pid = getpid();
/* Defer the work to the worker thread */
ret = work_queue(AIO_QUEUE, &aiocbp->aio_work, aio_fsync_worker, aiocbp, 0);
if (ret < 0)
{
aio->aio_result = ret;
set_errno(ret);
return ERROR;
}
return OK;
}
#endif /* CONFIG_LIBC_AIO */

35
libc/aio/aio_signal.c
View File

@ -92,33 +92,54 @@
int aio_signal(FAR struct aiocb *aiocbp)
{
int errcode;
int status;
int ret;
DEBUGASSERT(aiocbp);
ret = OK; /* Assume success */
/* Signal the client */
if (aiocbp->aio_sigevent.sigev_notify == SIGEV_SIGNAL)
{
#ifdef CONFIG_CAN_PASS_STRUCTS
ret = sigqueue(aiocbp->aio_pid, aiocbp->aio_sigevent.sigev_signo,
aiocbp->aio_sigevent.sigev_value);
status = sigqueue(aiocbp->aio_pid, aiocbp->aio_sigevent.sigev_signo,
aiocbp->aio_sigevent.sigev_value);
#else
ret = sigqueue(aiocbp->aio_pid, aiocbp->aio_sigevent.sigev_sign,
aiocbp->aio_sigevent.sigev_value.sival_ptr);
status = sigqueue(aiocbp->aio_pid, aiocbp->aio_sigevent.sigev_sign,
aiocbp->aio_sigevent.sigev_value.sival_ptr);
#endif
if (ret < 0)
{
errcode = get_errno();
fdbg("ERROR: sigqueue failed: %d\n", errcode);
ret = ERROR;
}
}
/* Send the poll signal in any event in case the caller is waiting
* on sig_suspend();
*/
else
status = kill(aiocbp->aio_pid, SIGPOLL);
if (status && ret == OK)
{
ret = kill(aiocbp->aio_pid, SIGPOLL);
errcode = get_errno();
fdbg("ERROR: kill failed: %d\n", errcode);
ret = ERROR;
}
return ret;
/* Make sure that errno is set correctly on return */
if (ret < 0)
{
set_errno(errcode);
return ERROR;
}
return OK;
}
#endif /* CONFIG_LIBC_AIO */

25
libc/aio/aio_suspend.c
View File

@ -125,11 +125,6 @@ int aio_suspend(FAR const struct aiocb *const list[], int nent,
DEBUGASSERT(aiocbp);
/* Create the signal set */
sigemptyset(&set);
sigaddset(&set, SIGPOLL);
/* Lock the scheduler so that no I/O events can complete on the worker
* thread until we set our wait set up. Pre-emption will, of course, be
* re-enabled while we are waiting for the signal.
@ -152,21 +147,19 @@ int aio_suspend(FAR const struct aiocb *const list[], int nent,
sched_unlock();
return OK;
}
/* If the caller has a signal notification setup, add that to the
* signals we will wait for.
*/
if (aiocbp->aio_sigevent.sigev_notify == SIGEV_SIGNAL)
{
sigaddset(&set, aiocbp->aio_sigevent.sigev_signo);
}
}
/* Then wait. sigtimedwait() will return the signal number that cause the
* error. It will set errno appropriately for this function on errors.
/* Then wait for SIGPOLL. On success sigtimedwait() will return the
* signal number that cause the error (SIGPOLL). It will set errno
* appropriately for this function on errors.
*
* NOTE: If completion of the I/O causes other signals to be generated
* first, then this will wake up and return EINTR instead of success.
*/
sigemptyset(&set);
sigaddset(&set, SIGPOLL);
ret = sigtimedwait(&set, NULL, &timeout)
sched_unlock();
return ret >= 0 ? OK : ERROR;

514
libc/aio/lio_listio.c
View File

@ -39,15 +39,16 @@
#include <nuttx/config.h>
#include <pthread.h>
#include <unistd.h>
#include <signal.h>
#include <aio.h>
#include <assert.h>
#include <errno.h>
#include "lib_internal.h"
#include "aio/aio.h"
#if defined(CONFIG_LIBC_AIO) && !defined(CONFIG_PTHREAD_DISABLE)
#ifdef CONFIG_LIBC_AIO
/****************************************************************************
* Pre-processor Definitions
@ -57,16 +58,15 @@
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure is passed to lio_thread() when the it is started by
* lio_listio().
*/
struct lio_threadparm_s
struct lio_sighand_s
{
FAR struct sigevent *sig; /* Used to notify the caller */
FAR struct aiocb *const *list; /* The list of I/O operations to be performed */
pid_t pid; /* ID of caller to be notified */
int nent; /* The number of elements in the list */
FAR struct aiocb * const *list; /* List of I/O operations */
FAR struct sigevent *sig; /* Describes how to signal the caller */
int nent; /* Number or elements in list[] */
pid_t pid; /* ID of client */
sigset_t oprocmask; /* sigprocmask to restore */
struct sigaction oact; /* Signal handler to restore */
};
/****************************************************************************
@ -82,53 +82,310 @@ struct lio_threadparm_s
****************************************************************************/
/****************************************************************************
* Name: lio_dolistio
* Name: lio_checkio
*
* Description:
* This function executes the I/O list. If lio_listio() is call with mode
* equal to LIO_WAIT, then this function will be called directly from
* lio_listio(). If lio_listio() is called with mode equal to LIO_NOWAIT,
* this function will be called from lio_thread. In either case, this
* function will not return until all of the I/O is the list has completed.
* Check if all I/O operations in the list are complete.
*
* Input Parameters:
* list - The list of I/O operations to be performed
* nent - The number of elements in the list
*
* Returned Value:
* Zero if the I/O list was complete successfully. Otherwise, a negated
* errno value is returned. NOTE that the errno is not set here because
* we may be running asynchronously on a different thread from the caller.
* Zero (OK) is returned if all I/O completed successfully.
* -EINPROGRESS is returned if one or more I/Os have not yet completed.
* The negated errno value if first error noted in the case where all I/O
* completed but one or more I/Os completed with an error.
*
* Assumptions:
* The scheduler is locked and no I/O can complete asynchronously with
* the logic in this function.
*
****************************************************************************/
static int lio_dolistio(FAR struct aiocb *const *list, int nent)
static int lio_checkio(FAR struct aiocb * const *list, int nent)
{
#warning Missing logic
return -ENOSYS;
FAR struct aiocb *aiocbp;
int ret;
int i;
ret = OK; /* Assume success */
/* Check each entry in the list. Break out of the loop if any entry
* has not completed.
*/
for (i = 0; i < nent; i++)
{
/* Skip over NULL entries */
aiocbp = list[i];
if (aiocbp)
{
/* Check if the I/O has completed */
if (aiocbp->aio_result == -EINPROGRESS)
{
/* No.. return -EINPROGRESS */
return -EINPROGRESS;
}
/* Check for an I/O error */
else if (aiocbp->aio_result < 0 && ret == OK)
{
/* Some other error other than -EINPROGRESS */
ret = aiocbp->aio_result;
}
}
}
/* All of the I/Os have completed */
return ret;
}
/****************************************************************************
* Name: lio_thread
* Name: lio_sighandler
*
* Description:
* When lio_listio() is called with LIO_NOWAIT, list I/O processing will
* occur on this thread.
* Handle the SIGPOLL signal.
*
* Input Parameters:
* arg - An instance of struct lio_thread_parm_s cast to pthread_addr_.t
* signo - The number of the signal that we caught (SIGPOLL)
* info - Information accompanying the signal
* context - Not used in NuttX
*
* Returned Value:
* NULL is returned.
* None
*
****************************************************************************/
static pthread_addr_t lio_thread(pthread_addr_t arg)
static void lio_sighandler(int signo, siginfo_t *info, void *ucontext)
{
FAR struct lio_threadparm_s *parms = (FAR struct lio_threadparm_s *)arg;
DEBUGASSERT(parms && parms->list);
#warning Missing logic
return NULL;
FAR struct aiocb *aiocbp;
FAR struct lio_sighand_s *sighand;
int ret;
DEBUGASSERT(signo == SIGPOLL && info);
/* The info structure should contain a pointer to the AIO control block */
aiocbp = (FAR struct aiocb *)info->si_value.sival_ptr;
DEBUGASSERT(aiocbp && aiocbp->aio_result != -EINPROGRESS);
/* Recover our private data from the AIO control block */
sighand = (FAR struct lio_sighand_s *)aiocbp->aio_priv;
DEBUGASSERT(sighand && sighand->list);
aiocbp->aio_priv = NULL;
/* Prevent any asynchronous I/O completions while the signal handler runs */
sched_lock();
/* Check if all of the pending I/O has completed */
ret = lio_checkio(sighand->list, sighand->nent);
if (ret != -EINPROGRESS)
{
/* All pending I/O has completed */
/* Restore the signal handler */
(void)sigaction(SIGPOLL, &sighand->oact, NULL);
/* Restore the sigprocmask */
(void)sigprocmask(SIG_SETMASK, &sighand->oprocmask, NULL);
/* Signal the client */
if (sighand->sig->sigev_notify == SIGEV_SIGNAL)
{
#ifdef CONFIG_CAN_PASS_STRUCTS
(void)sigqueue(sighand->pid, sighand->sig->sigev_signo,
sighand->sig->sigev_value);
#else
(void)sigqueue(sighand->aio_pid, sighand->sig.sigev_sign,
sighand->sig->sigev_value.sival_ptr);
#endif
}
/* And free the container */
lib_free(sighand);
}
sched_unlock();
}
/****************************************************************************
* Name: lio_sigsetup
*
* Description:
* Setup a signal handler to detect when until all I/O completes.
*
* Input Parameters:
* list - The list of I/O operations to be performed
* nent - The number of elements in the list
*
* Returned Value:
* Zero (OK) is returned if all I/O completed successfully; Otherwise, a
* negated errno value is returned corresponding to the first error
* detected.
*
* Assumptions:
* The scheduler is locked and no I/O can complete asynchronously with
* the logic in this function.
*
****************************************************************************/
static int lio_sigsetup(FAR struct aiocb * const *list, int nent,
FAR struct sigevent *sig)
{
FAR struct aiocb *aiocbp;
FAR struct lio_sighand_s *sighand;
sigset_t sigset;
struct sigaction act;
int status;
int i;
/* Allocate a structure to pass data to the signal handler */
sighand = (FAR struct lio_sighand_s *)lib_zalloc(sizeof(struct lio_sighand_s));
if (!sighand)
{
fdbg("ERROR: lib_zalloc failed\n");
return -ENOMEM;
}
/* Initialize the allocated structure */
sighand->list = list;
sighand->sig = sig;
sighand->nent = nent;
sighand->pid = getpid();
/* Save this structure as the private data attached to each aiocb */
for (i = 0; i < nent; i++)
{
/* Skip over NULL entries in the list */
aiocbp = list[i];
if (aiocbp)
{
FAR void *priv = NULL;
/* Check if I/O is pending for this entry */
if (aiocbp->aio_result == -EINPROGRESS)
{
priv = (FAR void *)sighand;
}
aiocbp->aio_priv = priv;
}
}
/* Make sure that SIGPOLL is not blocked */
(void)sigemptyset(&sigset);
(void)sigaddset(&sigset, SIGPOLL);
status = sigprocmask(SIG_UNBLOCK, &sigset, &sighand->oprocmask);
if (status != OK)
{
int errcode = get_errno();
fdbg("ERROR sigprocmask failed: %d\n", errcode);
DEBUGASSERT(errcode > 0);
return -errcode;
}
/* Attach our signal handler */
printf("waiter_main: Registering signal handler\n" );
act.sa_sigaction = lio_sighandler;
act.sa_flags = SA_SIGINFO;
(void)sigfillset(&act.sa_mask);
(void)sigdelset(&act.sa_mask, SIGPOLL);
status = sigaction(SIGPOLL, &act, &sighand->oact);
if (status != OK)
{
int errcode = get_errno();
fdbg("ERROR sigaction failed: %d\n", errcode);
DEBUGASSERT(errcode > 0);
return -errcode;
}
return OK;
}
/****************************************************************************
* Name: lio_waitall
*
* Description:
* Wait for all I/O operations in the list to be complete.
*
* Input Parameters:
* list - The list of I/O operations to be performed
* nent - The number of elements in the list
*
* Returned Value:
* Zero (OK) is returned if all I/O completed successfully; Otherwise, a
* negated errno value is returned corresponding to the first error
* detected.
*
* Assumptions:
* The scheduler is locked and no I/O can complete asynchronously with
* the logic in this function.
*
****************************************************************************/
static int lio_waitall(FAR struct aiocb * const *list, int nent)
{
sigset_t set;
int ret;
/* Loop until all I/O completes */
for (;;)
{
/* Check if all I/O has completed */
ret = lio_checkio(list, nent);
if (ret != -EINPROGRESS)
{
/* All I/O has completed.. We are finished. */
return ret;
}
/* Then wait for SIGPOLL -- indefinitely.
*
* NOTE: If completion of the I/O causes other signals to be generated
* first, then this will wake up and return EINTR instead of success.
*/
sigemptyset(&set);
sigaddset(&set, SIGPOLL);
ret = sigwaitinfo(&set, NULL);
if (ret < 0)
{
/* The most likely reason that we would get here is because some
* unrelated signal has been received.
*/
int errcode = get_errno();
fdbg("ERROR: sigwaitinfo failed: %d\n", errcode);
DEBUGASSERT(errcode > 0);
return -errcode;
}
}
}
/****************************************************************************
@ -279,8 +536,195 @@ static pthread_addr_t lio_thread(pthread_addr_t arg)
int lio_listio(int mode, FAR struct aiocb *const list[], int nent,
FAR struct sigevent *sig)
{
#warning Missing logic
return -ENOSYS;
FAR struct aiocb *aiocbp;
int nqueued;
int errcode;
int retcode;
int status;
int ret;
int i;
DEBUGASSERT(mode == LIO_WAIT || mode == LIO_NOWAIT);
DEBUGASSERT(list);
nqueued = 0; /* No I/O operations yet queued */
ret = OK; /* Assume success */
/* Lock the scheduler so that no I/O events can complete on the worker
* thread until we set our wait set up. Pre-emption will, of course, be
* re-enabled while we are waiting for the signal.
*/
sched_lock();
/* Submit each asynchronous I/O operation in the list, skipping over NULL
* entries.
*/
for (i = 0; i < nent; i++)
{
/* Skip over NULL entries */
aiocbp = list[i];
if (aiocbp)
{
/* Submit the operation according to its opcode */
status = OK;
switch (aiocbp->aio_lio_opcode)
{
case LIO_NOP:
{
/* Mark the do-nothing operation complete */
aiocbp->aio_result = OK;
}
break;
case LIO_READ:
case LIO_WRITE:
{
if (aiocbp->aio_lio_opcode == LIO_READ)
{
/* Submit the asynchronous read operation */
status = aio_read(aiocbp);
}
else
{
/* Submit the asynchronous write operation */
status = aio_write(aiocbp);
}
if (status < 0)
{
/* Failed to queue the I/O. Set up the error return. */
errcode = get_errno();
fdbg("ERROR: aio_read/write failed: %d\n", errcode);
DEBUGASSERT(errocode > 0);
aiocbp->aio_result = -errcode;
ret = ERROR;
}
else
{
/* Increment the count of successfully queue operations */
nqueued++;
}
}
break;
default:
{
/* Make the invalid operation complete with an error */
fdbg("ERROR: Unrecognized opcode: %d\n", aiocbp->aio_lio_opcode);
aiocbp->aio_result = -EINVAL;
ret = ERROR;
}
break;
}
}
}
/* If there was any failure in queuing the I/O, EIO will be returned */
retcode = EIO;
/* Now what? Three possibilities:
*
* Case 1: mode == LIO_WAIT
*
* Ignore the sig argument; Do no return until all I/O completes.
*/
if (mode == LIO_WAIT)
{
/* Don't wait if all if no I/O was queue */
if (nqueued > 0)
{
/* Wait until all I/O completes. The scheduler will be unlocked
* while we are waiting.
*/
status = lio_waitall(list, nent);
if (status < 0 && ret != OK)
{
/* Something bad happened while waiting and this is the first
* error to be reported.
*/
retcode = -status;
ret = ERROR;
}
}
}
/* Case 2: mode == LIO_NOWAIT and sig != NULL
*
* If any I/O was queued, then setup to signal the caller when all of
* the transfers complete.
*
* If no I/O was queue, then we I suppose that we need to signal the
* caller ourself?
*/
else if (sig && sig->sigev_notify == SIGEV_SIGNAL)
{
if (nqueued > 0)
{
/* Setup a signal handler to detect when until all I/O completes. */
status = lio_sigsetup(list, nent, sig);
if (status < 0 && ret != OK)
{
/* Something bad happened while setting up the signal and this
* is the first error to be reported.
*/
retcode = -status;
ret = ERROR;
}
}
else
{
#ifdef CONFIG_CAN_PASS_STRUCTS
status = sigqueue(getpid(), sig->sigev_signo,
sig->sigev_value);
#else
status = sigqueue(getpid(), sig->sigev_signo,
sig->sigev_value.sival_ptr);
#endif
if (status < 0 && ret != OK)
{
/* Something bad happened while signalling ourself and this is
* the first error to be reported.
*/
retcode = get_errno();
ret = ERROR;
}
}
}
/* Case 3: mode == LIO_NOWAIT and sig == NULL
*
* Just return now.
*/
sched_unlock();
if (ret < 0)
{
set_errno(retcode);
return ERROR;
}
return OK;
}
#endif /* CONFIG_LIBC_AIO && !CONFIG_PTHREAD_DISABLE */
#endif /* CONFIG_LIBC_AIO */