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Full Discussion: how to write application for 32 com port
Top Forums Programming how to write application for 32 com port Post 302129632 by amitpansuria on Wednesday 1st of August 2007 12:07:59 AM
Old 08-01-2007
Quote:
Originally Posted by porter
There are three basic options.

1. Write a single application and run 32 copies of it (this is the same way getty works)

2. Write a single-threaded application and use 'select' to determine which port is ready to read or write from.

3. Write a multi-threaded application and use either a thread per port, or two threads per port (one for reading, one for writing).

I would recommend option 1 as it's the easiest to write and test.

Option 2 is a more portable solution than 3 as you can avoid multithreading race conditions and synchronisation issues.
thx very much for replying me.
now in my application ,
data may come simultaneously in any port.
i mean data may come on more than one ports at a time and as soon as data come i m going to extract the packet and send that packet to another
port.
i think option 3 is better for me. but i m confuse here that if i use
two thread per port then there are 32 ports and i need to fire 64 threads.
is it good solution.
some one tell me that if u use 64 threads then your application become hand
please give me correct direction because its very important to make a correct design before writing the code.
Regards,
Amit
 

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LEARN ABOUT OSF1

iscc

iscc(7) 						 Miscellaneous Information Manual						   iscc(7)

NAME

       iscc - serial communications interface

SYNOPSIS

       controller  iscc0  at  isa0

DESCRIPTION

       An  onboard  Zilog  8530  DUART	provides  AXPvme-based Single Board Computers with console (CON) and auxiliary (AUX) serial communications
       ports.  Both serial communications ports can operate at baud rates from B50 to B38400,  excluding B134 (see tty(7)).

       On AXPvme Single Board Computers configured with a graphics head as the system console, the CON serial communications port (/dev/tty01)	is
       available for use by application programs as an additional communications port.

       In  the	absence  of a graphics head, the CON serial communications port (/dev/console) becomes the system console. When used as the serial
       system console, the CON serial communications port always operates at 9600 BPS, 8-bits, and no parity.

       Regardless of system console, the AUX serial communications port (/dev/tty00) is always available for use by application programs.

RESTRICTIONS

       Data communications equipment attached to the CON serial communications port must be set to 9600 BPS, 8-bits, no parity when configured	as
       the serial system console. The iscc terminal driver enforces this restriction.

       No modem control is supported for either the CON or AUX serial communications ports.

FILES

       console terminal local terminal local terminal

RELATED INFORMATION

       console(7), devio(7), tty(7), MAKEDEV(8) delim off

																	   iscc(7)
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