louie@trantor.UMD.EDU (01/02/86)
From: Louis A. Mamakos <louie@trantor.UMD.EDU> I'm writing (yet another) terminal program that also does XMODEM type file transfers. I'm using the console.device handler attached to a window to do the terminal emulation. Performence suffers pretty badly when making single character requests to the driver, so I'm trying to send more than one character at a time to the screen display. The problem that I've run across is not being able to ask for, say, 20 characters from the serial device driver without it blocking waiting for all 20 to arrive. I'd like to say, give me up to 20 characters that might already be buffered, or block if none are there. Then return me a single character. I'm using the 1.1 Kickstart and 1.1 Workbench disks and therefore that version of the serial driver. Louis A. Mamakos WA3YMH Internet: louie@TRANTOR.UMD.EDU University of Maryland, Computer Science Center - Systems Programming
tomp@amiga.UUCP (Tom Pohorsky) (01/03/86)
In article <876@caip.RUTGERS.EDU> louie@trantor.UMD.EDU writes: >The problem that I've run across is not being able to ask for, say, 20 >characters from the serial device driver without it blocking waiting for >all 20 to arrive. I'd like to say, give me up to 20 characters that >might already be buffered, or block if none are there. Under 1.1, DoIO the SDCMD_QUERY command. It will return (in the io_Actual field) the number of unread bytes in the serial.devices's input buffer. Then do a read of the "n" pending characters all at once.