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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 302131279 by amitpansuria on Friday 10th of August 2007 01:50:54 AM
Old 08-10-2007
how i create thread for handling 32 com ports
Quote:
Originally Posted by porter
The technique I normally use is to have a list of structs with a file-descriptor and a bitmask

Code:
struct serial_port
{
     struct serial_port *next
     int fd;
     int flags;
     .....
};

        .....

        fd_set fdr,fdw,fde;
        int n=-1; 
        FD_ZERO(&fdr); FD_ZERO(&fdw); FD_ZERO(&fde);

        struct serial_port *p=list;

        while (p) {        
              if (p->flags & 1) { FD_SET(p->fd,&fdr); n=max(n,p->fd); }
              if (p->flags & 2) { FD_SET(p->fd,&fdw); n=max(n,p->fd); }
              if (p->flags & 4) { FD_SET(p->fd,&fde); n=max(n,p->fd); }
             p=p->next;
        }
...
        n=select(n+1,&fdr,&fdw,&fde,NULL);
...
        p=list;
        
        while (p)
        {
            if ((p->flags & 1)&&FD_ISSET(p->fd,&fdr)) .... do read ...
            if ((p->flags & 2)&&FD_ISSET(p->fd,&fdw)) .... do write ...
            if ((p->flags & 4)&&FD_ISSET(p->fd,&fde)) .... do except ...
            p=p->next;
        }

Dear Sir,
thx very much for guiding me.
i m new in this serial stuff on linux.
now i want to write application using c++ which handle 32 com port simultaneously
using multithreading. i m still confusing about this stuff.
how i create one thread for read and one thread for write for each 32 com port(total 64 threads).
and second issue is that how i syncrhonize theses threads. and
third issue is that if i create 64 threads then application become crash or hand
i read tutorial on net but still confuse.
can u have some sample application for multiport application using multithreading
Regards,
Amit
 

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LEARN ABOUT DEBIAN

gammu-detect

GAMMU-DETECT(1) 						       Gammu							   GAMMU-DETECT(1)

NAME

       gammu-detect - Gammu device detection

       New in version 1.28.95.

SYNOPSIS

       gammu-detect [OPTIONS]

DESCRIPTION

       Script to detect available devices, which might be suitable for gammu.

       Note   This program lists all devices, which might be suitable, it does not do any probing on devices them self.

       Currently it supports following devices:

       o USB devices using udev

       o Serial ports using udev

       o Serial ports on Windows

       o Bluetooth devices using Bluez

       Note   Supported  devices  depend on platform you are using and compiled in features. You can find out what is actually compiled in by run-
	      ning gammu-detect -v.

       This program follows the usual GNU command line syntax, with long options starting with two dashes (--). A summary of options  is  included
       below.

       -h, --help
	      Show summary of options.

       -d, --debug
	      Show debugging output for detecting devices.

       -v, --version
	      Show version information and compiled in features.

       -u, --no-udev
	      Disables scanning of udev.

       -b, --no-bluez
	      Disables scanning using Bluez.

       -w, --no-win32-serial
	      Disables scanning of Windows serial ports.

OUTPUT

       The  output  of	gammu-detect is configuration file for Gammu (see gammurc) with configuration section for every device which might be used
       with gammu.

       Note   You can choose which section to use in gammu by gammu -s.

       When invoked as gammu-detect -d, also all examined devices are listed as comments in the output.

EXAMPLE

       ; Configuration file generated by gammu-detect.
       ; Please check The Gammu Manual for more information.

       [gammu]
       device = /dev/ttyACM0
       name = Nokia E52
       connection = at

       [gammu1]
       device = /dev/ttyACM1
       name = Nokia E52
       connection = at

       [gammu2]
       device = /dev/ttyS0
       name = Phone on serial port 0
       connection = at

       [gammu3]
       device = /dev/ttyS1
       name = Phone on serial port 1
       connection = at

       [gammu4]
       device = /dev/ttyS2
       name = Phone on serial port 2
       connection = at

       [gammu5]
       device = /dev/ttyS3
       name = Phone on serial port 3
       connection = at

       [gammu6]
       device = 5C:57:C8:BB:BB:BB
       name = Nokia E52
       connection = bluephonet

AUTHOR

       Michal iha <michal@cihar.com>

COPYRIGHT

       2009-2012, Michal iha <michal@cihar.com>

1.31.90 							 February 24, 2012						   GAMMU-DETECT(1)
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