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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 FREEBSD

dwarf_add_fde_inst

DWARF_ADD_FDE_INST(3)					   BSD Library Functions Manual 				     DWARF_ADD_FDE_INST(3)

NAME

     dwarf_add_fde_inst -- add a call frame instruction to a DWARF frame descriptor

LIBRARY

     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

     #include <libdwarf.h>

     Dwarf_P_Fde
     dwarf_add_fde_inst(Dwarf_P_Fde fde, Dwarf_Small op, Dwarf_Unsigned val1, Dwarf_Unsigned val2, Dwarf_Error *err);

DESCRIPTION

     Function dwarf_add_fde_inst() adds a call frame instruction to the DWARF frame descriptor referenced by argument fde.

     Argument fde should reference a frame descriptor allocated using dwarf_new_fde(3).

     Argument op specifies the operator for the frame instruction.  The DWARF standard defines the set of legal values for this argument.

     Argument val1 specifies the first operand of the frame instruction.

     Argument val2 specifies the second operand of the frame instruction.

     If argument err is not NULL, it will be used to store error information in case of an error.

RETURN VALUES

     On success, function dwarf_add_fde_inst() returns the frame descriptor given in argument fde.  In case of an error, function
     dwarf_add_fde_inst() returns DW_DLV_BADADDR and sets the argument err.

ERRORS

     Function dwarf_add_fde_inst() can fail with:

     [DW_DLE_ARGUMENT]		      Argument fde was NULL.

     [DW_DLE_FRAME_INSTR_EXEC_ERROR]  The frame instruction operator specified in argument op was invalid.

     [DW_DLE_MEMORY]		      An out of memory condition was encountered during the execution of the function.

SEE ALSO

     dwarf(3), dwarf_add_frame_fde(3), dwarf_add_frame_fde_b(3), dwarf_add_frame_cie(3), dwarf_fde_cfa_offset(3), dwarf_new_fde(3)

     The DWARF Debugging Information Format, Version 4, http://www.dwarfstd.org/.

BSD
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