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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 ULTRIX

dc

dc(4)							     Kernel Interfaces Manual							     dc(4)

Name
       dc - serial line/mouse/keyboard

Syntax
       device	 dc0  at ibus?	vector dcintr

Description
       The  serial line controller provides four ports, with modem control on two of the ports.  The DECstation 3100 and DECstation 2100 only pro-
       vide partial modem control.  The DECstation 5000 provides full modem control. The ports are used as follows:

       Port	 Usage
       0	 Graphics device keyboard at 4800 BPS
       1	 Mouse or tablet at 4800 BPS
       2	 Communications port 1 (w/modem control)/local terminal
       3	 Communications port 2 (w/modem control)/local terminal

       Each communication port from the serial line controller behaves as described in and can be set to run at any of 16 speeds.  For the  encod-
       ing, see

       When  a	graphics device is not being used as the system console, communications port 2 becomes the system console.  In this configuration,
       the port can only be used at 9600 BPS and no modem control is supported.

       The serial line driver operates in interrupt-per-character mode (all pending characters are flushed from the silo on each interrupt).

Restrictions
       Speed must be set to 9600 BPS on the console port and 4800 BPS on ports used by graphics devices.  The serial  line  driver  enforces  this
       restriction; that is, changing speeds with the command may not always work on these ports.

Files
       console terminal

       local terminal

       local terminal

See Also
       console(4), devio(4), tty(4), ttys(5), MAKEDEV(8)

								       RISC								     dc(4)
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