Developer Guide and Reference

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Example for lio_listio Function

The following example illustrates how the
lio_
listio()
function can be used.
int aio_ex_5(HANDLE fd) {   static struct aiocb aio[2];   static struct aiocb *aio_list[2] = {&aio[0], &aio[1]};    int i, ret;   /*  ** Data initialization and Synchronously writing */  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)  aio[0].aio_lio_opcode = aio[1].aio_lio_opcode = LIO_WRITE;  ret = lio_listio(LIO_WAIT, aio_list, 2, 0);  if (ret) return ret;    return 0; }/* aio_ex_5 */
Result upon execution:
-bash-3.00$ ./a.out -bash-3.00$ cat dat rec#1 rec#2 -bash-3.00$
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);
  3. The
    aio_lio_opcode
    refers to the field of each
    aiocb
    structure that specifies the operation to be performed. The supported operations are
    LIO_READ
    (do a 'read' operation),
    LIO_WRITE
    (do a 'write' operation), and
    LIO_NOP
    (do no operation); these symbols are defined in
    <aio.h>
    .

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804