how to write application for 32 com port Post: 302129632

Sponsored Content

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

08-01-2007

Registered User

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

amitpansuria

View Public Profile for amitpansuria

Find all posts by amitpansuria

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

which port to write my server application?

I want to write a server application that would accept HTTP requests from client. The server would be on a machine that has no connection to the INTERNET. The clients that would be posting their HTTP requests would be doing so through webbrowser .Thus it would be sort of intranet application....

2. IP Networking

How can I check what port addresses used the application

Hello Mentors! I am a new here in the furom, i hope somebody can understand my problem. Basically we have an application here called unigraphics and being installed per station and the setup is look like this. 1. installed unigraphics UGNX3 version on every station 2. some are installed in...

3. UNIX for Dummies Questions & Answers

What application is using the port

Hello im using sunos im trying to lock down application that taking my port when Im doing "netstat -in | grep 8080" Is gives me the indication that the port is taken but no indication who is taken the port. How can I find out who is taking my port? Thanks allot

4. Linux

MQ application port 1414

Hi All, I have two MQ (port) 1414 established (going out) $ netstat -an | grep 1414 tcp 0 0 0.0.0.0:1414 0.0.0.0:* LISTEN tcp 0 0 20.76.1.1:32855 142.8.1.3:1414 ESTABLISHED tcp 0 0...

5. Shell Programming and Scripting

command to know the application running of the port

Hi, is there any command to findout that which application is using the particular port. or whether any port is occupied with the specfic process id ?

6. Programming

Write own decryption application

Hi , I need some help as I dont know where to start. I need to create a unix decryption application. The information I have been given is this so far: the specification of the encryption process is: NET 2 Cryptography classes. RijndaelManaged encryption algorithm ...

7. Programming

unable to send read and write serial port

hey frns pls help me out !! i hav a code of c that i have to include in my project. i am using a device (geomeda) that has unix based OS. it also support SIM card for connecting to server . I need to send SMS to user from this device.. below code is not working .. i am unable to send sms and the...

8. HP-UX

how to check remote server port listening from application.

Hi, I have an application running on HP-UX, from this application I need to findout if the port number. lets say 7890,7891, 7892 are listening on the remote server running on HP-UX. Is there any way of doing it using "system()" function or any other? I noticed that nmap, netcat are not...

9. UNIX for Advanced & Expert Users

How to write if condition in shell script for application server?

Hi all, I have a code to create folder in application server through shell script and i want to create if conditional based folder folder=$HOME/test/sample/whatever if ; then echo "$folder already exists, not created." else mkdir -p "$folder" > /dev/null 2>&1 ...

10. Shell Programming and Scripting

Help Generate new port base on the last port but not in used by other application

Hi Expert, Anybody can figure it out on how to generate new port base on my last port let say my last port var1=124 and increment for new port 125,126 but this new two ports need to look at first if this port is not in used by any service, if the port is in used add 1 to new port and if in used...

LEARN ABOUT REDHAT

statserial

STATSERIAL(1)							   User Commands						     STATSERIAL(1)

NAME

       statserial - display serial port modem status lines

SYNOPSIS

       statserial [-n |  -d | -x] <device-name>

DESCRIPTION

       Statserial displays a table of the signals on a standard 9-pin or 25-pin serial port, and indicates the status of the handshaking lines. It
       can be useful for debugging problems with serial ports or modems.

       The optional device-name parameter is the full name of the device file for the serial port in question. If not specified,  the  default	is
       taken from the environment variable MODEM if set, otherwise /dev/cua1.

COMMAND-LINE OPTIONS
       Each of the command line options is mutually exclusive.

       -n   Normally  statserial  will loop continuously, updating the status at one second intervals; you can exit using Control-C. The -n option
	    disables looping.

       -d

	    With this option the status of the modem is printed as a decimal number. The bits are encoded as follows (XXX indicates unused bits):

	    +---+---+---+---+---+---+---+---+---+
	    | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
	    +---+---+---+---+---+---+---+---+---+
	    |DSR|RI |DCD|CTS|XXX|XXX|RTS|DTR|XXX|
	    +---+---+---+---+---+---+---+---+---+

       -x   This option is the same as -d, except that the output is in hexadecimal.

BUGS
/LIMITATIONS
       Statserial only works with devices that support the TIOCMGET ioctl.

       You need permission to read the device file.

       The device file may be locked if other applications are using it.

AUTHOR

       Statserial was written by Jeff Tranter (Jeff_Tranter@Mitel.COM), later updated by Frank Baumgart (godot@uni-paderborn.de) and  is  released
       under the conditions of the GNU General Public License.	See the file COPYING and notes in the source code for details.

SEE ALSO

       setserial(8) stty(1)
       /usr/src/linux/drivers/char/serial.c /usr/include/linux/termios.h

Linux								 17 December 1994						     STATSERIAL(1)

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

which port to write my server application?

Discussion started by: rraajjiibb

2. IP Networking

How can I check what port addresses used the application

Discussion started by: eykyn17

3. UNIX for Dummies Questions & Answers

What application is using the port

Discussion started by: umen

4. Linux

MQ application port 1414

Discussion started by: itik