int aio_read(struct aiocb *aiocbp)
{
aiocbp->aio_offset_hi = (aiocbp->aio_offset < 0) ? -1 : 0;
return aio_read64((struct aiocb64 *)aiocbp);
}
int
do_test (int argc, char *argv[])
{
struct aiocb64 cbs[10];
struct aiocb64 cbs_fsync;
struct aiocb64 *cbp[10];
struct aiocb64 *cbp_fsync[1];
char buf[1000];
size_t cnt;
int result = 0;
/* Preparation. */
for (cnt = 0; cnt < 10; ++cnt)
{
cbs[cnt].aio_fildes = fd;
cbs[cnt].aio_reqprio = 0;
cbs[cnt].aio_buf = memset (&buf[cnt * 100], '0' + cnt, 100);
cbs[cnt].aio_nbytes = 100;
cbs[cnt].aio_offset = cnt * 100;
cbs[cnt].aio_sigevent.sigev_notify = SIGEV_NONE;
cbp[cnt] = &cbs[cnt];
}
/* First a simple test. */
for (cnt = 10; cnt > 0; )
if (aio_write64 (cbp[--cnt]) < 0 && errno == ENOSYS)
{
error (0, 0, "no aio support in this configuration");
return 0;
}
/* Wait 'til the results are there. */
result |= do_wait (cbp, 10, 0);
/* Test this. */
result |= test_file (buf, sizeof (buf), fd, "aio_write");
/* Read now as we've written it. */
memset (buf, '\0', sizeof (buf));
/* Issue the commands. */
for (cnt = 10; cnt > 0; )
{
--cnt;
cbp[cnt] = &cbs[cnt];
aio_read64 (cbp[cnt]);
}
/* Wait 'til the results are there. */
result |= do_wait (cbp, 10, 0);
/* Test this. */
for (cnt = 0; cnt < 1000; ++cnt)
if (buf[cnt] != '0' + (cnt / 100))
{
result = 1;
error (0, 0, "comparison failed for aio_read test");
break;
}
if (cnt == 1000)
puts ("aio_read test ok");
/* Remove the test file contents. */
if (ftruncate64 (fd, 0) < 0)
{
error (0, errno, "ftruncate failed\n");
result = 1;
}
/* Test lio_listio. */
for (cnt = 0; cnt < 10; ++cnt)
{
cbs[cnt].aio_lio_opcode = LIO_WRITE;
cbp[cnt] = &cbs[cnt];
}
/* Issue the command. */
lio_listio64 (LIO_WAIT, cbp, 10, NULL);
/* ...and immediately test it since we started it in wait mode. */
result |= test_file (buf, sizeof (buf), fd, "lio_listio (write)");
/* Test aio_fsync. */
cbs_fsync.aio_fildes = fd;
cbs_fsync.aio_sigevent.sigev_notify = SIGEV_NONE;
cbp_fsync[0] = &cbs_fsync;
/* Remove the test file contents first. */
if (ftruncate64 (fd, 0) < 0)
{
error (0, errno, "ftruncate failed\n");
result = 1;
}
/* Write again. */
for (cnt = 10; cnt > 0; )
aio_write64 (cbp[--cnt]);
if (aio_fsync64 (O_SYNC, &cbs_fsync) < 0)
{
error (0, errno, "aio_fsync failed\n");
result = 1;
}
result |= do_wait (cbp_fsync, 1, 0);
/* ...and test since all data should be on disk now. */
result |= test_file (buf, sizeof (buf), fd, "aio_fsync (aio_write)");
/* Test aio_cancel. */
/* Remove the test file contents first. */
if (ftruncate64 (fd, 0) < 0)
{
error (0, errno, "ftruncate failed\n");
result = 1;
}
/* Write again. */
for (cnt = 10; cnt > 0; )
aio_write64 (cbp[--cnt]);
/* Cancel all requests. */
if (aio_cancel64 (fd, NULL) == -1)
printf ("aio_cancel64 (fd, NULL) cannot cancel anything\n");
result |= do_wait (cbp, 10, ECANCELED);
/* Another test for aio_cancel. */
/* Remove the test file contents first. */
if (ftruncate64 (fd, 0) < 0)
{
error (0, errno, "ftruncate failed\n");
result = 1;
}
/* Write again. */
for (cnt = 10; cnt > 0; )
{
--cnt;
cbp[cnt] = &cbs[cnt];
aio_write64 (cbp[cnt]);
}
puts ("finished3");
/* Cancel all requests. */
for (cnt = 10; cnt > 0; )
if (aio_cancel64 (fd, cbp[--cnt]) == -1)
/* This is not an error. The request can simply be finished. */
printf ("aio_cancel64 (fd, cbp[%Zd]) cannot be canceled\n", cnt);
puts ("finished2");
result |= do_wait (cbp, 10, ECANCELED);
puts ("finished");
return result;
}
//
// ReadFile() reads "bytes_to_read" bytes from the file_handle into the buffer.
// The call uses asynch I/O routine aio_read().
//
// ReadFile() checks the Overlapped structure to determine the read offset in the file handle.
// It also determines from the Overlapped structure if the I/O completion status should be
// posted on the event queue or the completion queue associated with the file handle.
//
BOOL ReadFile(HANDLE file_handle, void *buffer, DWORD bytes_to_read, LPDWORD bytes_read, LPOVERLAPPED lpOverlapped)
{
struct File *filep;
struct IOCQ *this_cq;
struct aiocb64 *aiocbp;
int i, free_index = -1;
#ifdef IMMEDIATE_AIO_COMPLETION
int aio_error_return;
#endif
filep = (struct File *)file_handle;
//
// At this point we have to decide whether to place this in the Completion queue
// or the event queue.
if ((ULONG_PTR) lpOverlapped->hEvent & 0x00000001) {
// forcibly place this on the event queue even though a completion queue is associated
// with the file. Well, thats what you asked for.
this_cq = (IOCQ *) ((ULONG_PTR) lpOverlapped->hEvent ^ 0x1);
} else
this_cq = filep->iocq;
if (this_cq == NULL) {
cout << "event or completion queue not allocated " << endl;
return (FALSE);
}
// First locate an empty slot in the queue.
if (this_cq->last_freed != -1) {
free_index = this_cq->last_freed;
this_cq->last_freed = -1; // the slot is taken. Thanks
} else {
// search for a free index.
for (i = 0; i < this_cq->size; i++) {
if (this_cq->aiocb_list[i] == NULL) {
free_index = i;
break;
}
}
}
// either free_index holds the free index or there is no free space in the Q.
if (free_index == -1)
return (FALSE);
aiocbp = &this_cq->element_list[free_index].aiocbp;
aiocbp->aio_buf = buffer;
aiocbp->aio_fildes = filep->fd;
aiocbp->aio_nbytes = bytes_to_read;
aiocbp->aio_offset = (off64_t) lpOverlapped->OffsetHigh;
aiocbp->aio_offset = aiocbp->aio_offset << 32;
aiocbp->aio_offset += lpOverlapped->Offset;
aiocbp->aio_sigevent.sigev_notify = SIGEV_NONE;
this_cq->element_list[free_index].data = lpOverlapped;
this_cq->element_list[free_index].bytes_transferred = 0;
this_cq->element_list[free_index].completion_key = filep->completion_key;
*bytes_read = 0;
#if defined(IOMTR_OS_LINUX) || defined(IOMTR_OS_OSX) || defined(IOMTR_OS_SOLARIS)
if (aio_read64(&this_cq->element_list[free_index].aiocbp) < 0)
#elif defined(IOMTR_OS_NETWARE)
if (aio_read64(&this_cq->element_list[free_index].aiocbp, filep->type) < 0)
#else
#warning ===> WARNING: You have to do some coding here to get the port done!
#endif
{
cout << "queuing for read failed with error " << errno << endl;
// Note that we have not set aiocb_list[] with the correct pointers.
// So, this slot will get grabbed in the next loop.
SetLastError(errno);
return (FALSE);
}
#ifdef IMMEDIATE_AIO_COMPLETION
// Check if the aio_read completed successfully.
if ((aio_error_return = aio_error64(&this_cq->element_list[free_index].aiocbp)) != EINPROGRESS) {
*bytes_read = (DWORD) aio_return64(&this_cq->element_list[free_index].aiocbp);
if ((long)*bytes_read < 0) {
*bytes_read = 0;
if (aio_error_return)
SetLastError(aio_error_return);
else if (errno)
SetLastError(errno);
return (FALSE);
} else {
SetLastError(0);
return (TRUE);
}
}
#endif
else
// aio_read is in progress. We have to set the aiocb_list[] to point correctly.
this_cq->aiocb_list[free_index] = aiocbp;
SetLastError(ERROR_IO_PENDING);
return (FALSE);
}
