| NAME |
| SCI_Poll - Check for arriving messages in polling mode |
| |
| C Syntax |
| #include <sci.h> |
| int SCI_Poll(int timeout) |
| |
| INPUT PARAMETERS |
| timeout |
| Timeout if no message arrives in timeout milliseconds, <0 means no timeout (IN). |
| |
| DESCRIPTION |
| This subroutine is used to check for arriving messages in polling mode. If a new |
| message is arrived, user-registered handler in sci_info_t will be called to handle |
| the message, otherwise a timeout will occur after timeout milliseconds elapsed. |
| |
| If timeout is set to a negative value, no timeout will occur, and SCI_Poll can only |
| return when a new message arrived or errors occurred. |
| |
| For more information, please refer to SCI's online documents. |
| |
| EXAMPLE |
| { |
| int pollFd, extFd, maxFd; |
| fd_set fdSet; |
| SCI_Query(POLLING_FD, &pollFd); |
| ... |
| FD_ZERO(&fdSet); |
| FD_SET(pollFd, &fdSet); |
| FD_SET(extFd, &fdSet); |
| maxFd = (pollFd > extFd) ? pollFd : extFd; |
| select(maxFd+1, &fdSet, 0, 0, NULL); |
| if (FD_ISSET(pollFd, &fdSet)) { |
| SCI_Poll(-1); |
| } |
| if (FD_ISSET(extFd, &fdSet)) { |
| ... |
| } |
| } |
| |
| ERRORS |
| All SCI routines return an error value. |
| |
| SCI_ERR_UNINTIALIZED |
| Uninitialized SCI execution environment |
| SCI_ERR_INVALID_CALLER |
| Can only be called in the front end |
| SCI_ERR_MODE |
| Can only be used in polling mode |
| SCI_ERR_POLL_INVALID |
| Invalid polling calls |
| SCI_ERR_POLL_TIMEOUT |
| A polling timeout occurs after timeout milliseconds elapsed |
| |
| SEE ALSO |
| SCI_Bcast(3) |
| SCI_Upload(3) |
