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#2

Remarks:

1. In the example, the IC_AIO_DATA_INIT is 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;}

2. The file descriptor fd is obtained as:

   HANDLE fd = CreateFile("dat",

     GENERIC_READ | GENERIC_WRITE,

     FILE_SHARE_READ,

     NULL,

     OPEN_ALWAYS,

     FILE_ATTRIBUTE_NORMAL/*|FILE_FLAG_OVERLAPPED*/,

     NULL);