Starts a partial non-blocking read.
a0tError | a0IFReadPart( | | | |
| | a0tDMARegion | *region, | |
| | int | gfirst, | |
| | int | gcount, | |
| | a0tRequest | *request, | |
| | a0tFormat | *format, | |
| | void | *address, | |
| | int | count );
| |
| Name | rd/wr | Description |
| region | read | DMA region to read. |
| gfirst | read | First element of the DMA region to read. |
| gcount | read | Number of elements to read. |
| request | write | Request descriptor to hold the status. |
| format | read | Format of the data to receive. |
| address | write | Address of the data to receive. |
| count | read | Number of elements of the data to receive. |
This function starts a non-blocking read from a specific DMA region region. It posts a request to read the remote data with its own format information, but starting at the element gfirst, with gcount elements. The data received locally will be treated as count elements of the format and will be stored starting at address.
On return of this function, the variable pointed by request contains an opaque request that should be used later to wait or test the completion of the read operation.
| Error Code | Description |
A0ErrFailSend | It was not possible to send a request. | |
A0ErrFailReceive | It was not possible to receive a reply. | |
A0ErrInvFormat | The format has an invalid type. | |
A0ErrNotImplem | The format has an unimplemented type. | |
A0ErrOk| Successful completion. | |
a0FReadPart() a0IFWritePart() a0IFRead() a0UseFormats() a0NewMapFormat() a0NewFunctionFormat() a0NewDMARegion() a0WaitRequest() a0TestRequest()