обзор асинхронного ввода-вывода POSIX (POSIX asynchronous I/O overview)
Имя (Name)
aio - POSIX asynchronous I/O overview
Описание (Description)
The POSIX asynchronous I/O (AIO) interface allows applications to
initiate one or more I/O operations that are performed
asynchronously (i.e., in the background). The application can
elect to be notified of completion of the I/O operation in a
variety of ways: by delivery of a signal, by instantiation of a
thread, or no notification at all.
The POSIX AIO interface consists of the following functions:
aio_read(3)
Enqueue a read request. This is the asynchronous analog
of read(2).
aio_write(3)
Enqueue a write request. This is the asynchronous analog
of write(2).
aio_fsync(3)
Enqueue a sync request for the I/O operations on a file
descriptor. This is the asynchronous analog of fsync(2)
and fdatasync(2).
aio_error(3)
Obtain the error status of an enqueued I/O request.
aio_return(3)
Obtain the return status of a completed I/O request.
aio_suspend(3)
Suspend the caller until one or more of a specified set of
I/O requests completes.
aio_cancel(3)
Attempt to cancel outstanding I/O requests on a specified
file descriptor.
lio_listio(3)
Enqueue multiple I/O requests using a single function
call.
The aiocb ("asynchronous I/O control block") structure defines
parameters that control an I/O operation. An argument of this
type is employed with all of the functions listed above. This
structure has the following form:
#include <aiocb.h>
struct aiocb {
/* The order of these fields is implementation-dependent */
int aio_fildes; /* File descriptor */
off_t aio_offset; /* File offset */
volatile void *aio_buf; /* Location of buffer */
size_t aio_nbytes; /* Length of transfer */
int aio_reqprio; /* Request priority */
struct sigevent aio_sigevent; /* Notification method */
int aio_lio_opcode; /* Operation to be performed;
lio_listio() only */
/* Various implementation-internal fields not shown */
};
/* Operation codes for 'aio_lio_opcode': */
enum { LIO_READ, LIO_WRITE, LIO_NOP };
The fields of this structure are as follows:
aio_fildes
The file descriptor on which the I/O operation is to be
performed.
aio_offset
This is the file offset at which the I/O operation is to
be performed.
aio_buf
This is the buffer used to transfer data for a read or
write operation.
aio_nbytes
This is the size of the buffer pointed to by aio_buf.
aio_reqprio
This field specifies a value that is subtracted from the
calling thread's real-time priority in order to determine
the priority for execution of this I/O request (see
pthread_setschedparam(3)). The specified value must be
between 0 and the value returned by
sysconf(_SC_AIO_PRIO_DELTA_MAX). This field is ignored
for file synchronization operations.
aio_sigevent
This field is a structure that specifies how the caller is
to be notified when the asynchronous I/O operation
completes. Possible values for aio_sigevent.sigev_notify
are SIGEV_NONE, SIGEV_SIGNAL, and SIGEV_THREAD. See
sigevent(7) for further details.
aio_lio_opcode
The type of operation to be performed; used only for
lio_listio(3).
In addition to the standard functions listed above, the GNU C
library provides the following extension to the POSIX AIO API:
aio_init(3)
Set parameters for tuning the behavior of the glibc POSIX
AIO implementation.
Ошибки (Error)
EINVAL The aio_reqprio field of the aiocb structure was less than
0, or was greater than the limit returned by the call
sysconf(_SC_AIO_PRIO_DELTA_MAX).
Версии (Versions)
The POSIX AIO interfaces are provided by glibc since version 2.1.
Стандарты (Conforming to)
POSIX.1-2001, POSIX.1-2008.
Примечание (Note)
It is a good idea to zero out the control block buffer before use
(see memset(3)). The control block buffer and the buffer pointed
to by aio_buf must not be changed while the I/O operation is in
progress. These buffers must remain valid until the I/O
operation completes.
Simultaneous asynchronous read or write operations using the same
aiocb structure yield undefined results.
The current Linux POSIX AIO implementation is provided in user
space by glibc. This has a number of limitations, most notably
that maintaining multiple threads to perform I/O operations is
expensive and scales poorly. Work has been in progress for some
time on a kernel state-machine-based implementation of
asynchronous I/O (see io_submit(2), io_setup(2), io_cancel(2),
io_destroy(2), io_getevents(2)), but this implementation hasn't
yet matured to the point where the POSIX AIO implementation can
be completely reimplemented using the kernel system calls.
Примеры (Examples)
The program below opens each of the files named in its command-
line arguments and queues a request on the resulting file
descriptor using aio_read(3). The program then loops,
periodically monitoring each of the I/O operations that is still
in progress using aio_error(3). Each of the I/O requests is set
up to provide notification by delivery of a signal. After all
I/O requests have completed, the program retrieves their status
using aio_return(3).
The SIGQUIT signal (generated by typing control-\) causes the
program to request cancellation of each of the outstanding
requests using aio_cancel(3).
Here is an example of what we might see when running this
program. In this example, the program queues two requests to
standard input, and these are satisfied by two lines of input
containing "abc" and "x".
$ ./a.out /dev/stdin /dev/stdin
opened /dev/stdin on descriptor 3
opened /dev/stdin on descriptor 4
aio_error():
for request 0 (descriptor 3): In progress
for request 1 (descriptor 4): In progress
abc
I/O completion signal received
aio_error():
for request 0 (descriptor 3): I/O succeeded
for request 1 (descriptor 4): In progress
aio_error():
for request 1 (descriptor 4): In progress
x
I/O completion signal received
aio_error():
for request 1 (descriptor 4): I/O succeeded
All I/O requests completed
aio_return():
for request 0 (descriptor 3): 4
for request 1 (descriptor 4): 2
Program source
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <aio.h>
#include <signal.h>
#define BUF_SIZE 20 /* Size of buffers for read operations */
#define errExit(msg) do { perror(msg); exit(EXIT_FAILURE); } while (0)
struct ioRequest { /* Application-defined structure for tracking
I/O requests */
int reqNum;
int status;
struct aiocb *aiocbp;
};
static volatile sig_atomic_t gotSIGQUIT = 0;
/* On delivery of SIGQUIT, we attempt to
cancel all outstanding I/O requests */
static void /* Handler for SIGQUIT */
quitHandler(int sig)
{
gotSIGQUIT = 1;
}
#define IO_SIGNAL SIGUSR1 /* Signal used to notify I/O completion */
static void /* Handler for I/O completion signal */
aioSigHandler(int sig, siginfo_t *si, void *ucontext)
{
if (si->si_code == SI_ASYNCIO) {
write(STDOUT_FILENO, "I/O completion signal received\n", 31);
/* The corresponding ioRequest structure would be available as
struct ioRequest *ioReq = si->si_value.sival_ptr;
and the file descriptor would then be available via
ioReq->aiocbp->aio_fildes */
}
}
int
main(int argc, char *argv[])
{
struct sigaction sa;
int s;
int numReqs; /* Total number of queued I/O requests */
int openReqs; /* Number of I/O requests still in progress */
if (argc < 2) {
fprintf(stderr, "Usage: %s <pathname> <pathname>...\n",
argv[0]);
exit(EXIT_FAILURE);
}
numReqs = argc - 1;
/* Allocate our arrays. */
struct ioRequest *ioList = calloc(numReqs, sizeof(*ioList));
if (ioList == NULL)
errExit("calloc");
struct aiocb *aiocbList = calloc(numReqs, sizeof(*aiocbList));
if (aiocbList == NULL)
errExit("calloc");
/* Establish handlers for SIGQUIT and the I/O completion signal. */
sa.sa_flags = SA_RESTART;
sigemptyset(&sa.sa_mask);
sa.sa_handler = quitHandler;
if (sigaction(SIGQUIT, &sa, NULL) == -1)
errExit("sigaction");
sa.sa_flags = SA_RESTART | SA_SIGINFO;
sa.sa_sigaction = aioSigHandler;
if (sigaction(IO_SIGNAL, &sa, NULL) == -1)
errExit("sigaction");
/* Open each file specified on the command line, and queue
a read request on the resulting file descriptor. */
for (int j = 0; j < numReqs; j++) {
ioList[j].reqNum = j;
ioList[j].status = EINPROGRESS;
ioList[j].aiocbp = &aiocbList[j];
ioList[j].aiocbp->aio_fildes = open(argv[j + 1], O_RDONLY);
if (ioList[j].aiocbp->aio_fildes == -1)
errExit("open");
printf("opened %s on descriptor %d\n", argv[j + 1],
ioList[j].aiocbp->aio_fildes);
ioList[j].aiocbp->aio_buf = malloc(BUF_SIZE);
if (ioList[j].aiocbp->aio_buf == NULL)
errExit("malloc");
ioList[j].aiocbp->aio_nbytes = BUF_SIZE;
ioList[j].aiocbp->aio_reqprio = 0;
ioList[j].aiocbp->aio_offset = 0;
ioList[j].aiocbp->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
ioList[j].aiocbp->aio_sigevent.sigev_signo = IO_SIGNAL;
ioList[j].aiocbp->aio_sigevent.sigev_value.sival_ptr =
&ioList[j];
s = aio_read(ioList[j].aiocbp);
if (s == -1)
errExit("aio_read");
}
openReqs = numReqs;
/* Loop, monitoring status of I/O requests. */
while (openReqs > 0) {
sleep(3); /* Delay between each monitoring step */
if (gotSIGQUIT) {
/* On receipt of SIGQUIT, attempt to cancel each of the
outstanding I/O requests, and display status returned
from the cancellation requests. */
printf("got SIGQUIT; canceling I/O requests: \n");
for (int j = 0; j < numReqs; j++) {
if (ioList[j].status == EINPROGRESS) {
printf(" Request %d on descriptor %d:", j,
ioList[j].aiocbp->aio_fildes);
s = aio_cancel(ioList[j].aiocbp->aio_fildes,
ioList[j].aiocbp);
if (s == AIO_CANCELED)
printf("I/O canceled\n");
else if (s == AIO_NOTCANCELED)
printf("I/O not canceled\n");
else if (s == AIO_ALLDONE)
printf("I/O all done\n");
else
perror("aio_cancel");
}
}
gotSIGQUIT = 0;
}
/* Check the status of each I/O request that is still
in progress. */
printf("aio_error():\n");
for (int j = 0; j < numReqs; j++) {
if (ioList[j].status == EINPROGRESS) {
printf(" for request %d (descriptor %d): ",
j, ioList[j].aiocbp->aio_fildes);
ioList[j].status = aio_error(ioList[j].aiocbp);
switch (ioList[j].status) {
case 0:
printf("I/O succeeded\n");
break;
case EINPROGRESS:
printf("In progress\n");
break;
case ECANCELED:
printf("Canceled\n");
break;
default:
perror("aio_error");
break;
}
if (ioList[j].status != EINPROGRESS)
openReqs--;
}
}
}
printf("All I/O requests completed\n");
/* Check status return of all I/O requests. */
printf("aio_return():\n");
for (int j = 0; j < numReqs; j++) {
ssize_t s;
s = aio_return(ioList[j].aiocbp);
printf(" for request %d (descriptor %d): %zd\n",
j, ioList[j].aiocbp->aio_fildes, s);
}
exit(EXIT_SUCCESS);
}
Смотри также (See also)
io_cancel(2), io_destroy(2), io_getevents(2), io_setup(2),
io_submit(2), aio_cancel(3), aio_error(3), aio_init(3),
aio_read(3), aio_return(3), aio_write(3), lio_listio(3)
"Asynchronous I/O Support in Linux 2.5", Bhattacharya, Pratt,
Pulavarty, and Morgan, Proceedings of the Linux Symposium, 2003,
⟨https://www.kernel.org/doc/ols/2003/ols2003-pages-351-366.pdf⟩
