Example for aio_suspend Function
The following example illustrates a wait operation execution using the
aio_suspend()
function.
int aio_ex_2(HANDLE fd)
{
static struct aiocb aio[2];
static struct aiocb *aio_list[2] = {&aio[0], &aio[1]};
int i, ret;
/* Data initialization */
IC_AIO_DATA_INIT(aio[0], fd, "rec#1\n", strlen("rec#1\n"), 0)
IC_AIO_DATA_INIT(aio[1], fd, "rec#2\n", strlen("rec#2\n"), aio[0].aio_nbytes)
/* Asynch-write */
if (aio_write(&aio[0]) == -1) return errno;
if (aio_write(&aio[1]) == -1) return errno;
/* Do some complex computation */
printf("do_compute(1000, 1.123)=%f", do_compute(1000, 1.123));
/* do the wait operation using sleep() */
ret = aio_suspend(aio_list, 2, 0);
if (ret == -1) return errno;
return 0;
}/* aio_ex_2 */Result upon execution:
-bash-3.00$ ./a.out
-bash-3.00$ cat dat
rec#1
rec#2Remarks:
- In the example, theIC_AIO_DATA_INITis defined as follows:#define IC_AIO_DATA_INIT(_aio, _fd, _dat, _len, _off)\ {memset(&_aio, 0, sizeof(_aio)); \ _aio.aio_fildes = _fd; \ _aio.aio_buf = _dat; \ _aio.aio_nbytes = _len; \ _aio.aio_offset = _off;}
- The file descriptorfdis obtained as:HANDLE fd = CreateFile("dat", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL/*|FILE_FLAG_OVERLAPPED*/, NULL);