[Boost-users] boost::io_service run() never returns

3 Jul 2013

      I have the following simplified code to read data from a RS232 port. For some
(from beginning) runs, io.run() returns immediately and m_handler() is
called which is expected. but sometimes (a fresh run from beginning),
io.run() goes into a inside forever loop(stacked inside forever) even for
the first time called inside the while loop. And this happens randomly.
What's is/are the potential problem(s) at here?

Thanks.

-shunguang

#define BUF_SIZE    512
char data[BUF_SIZE];

void my_handler(const boost::system::error_code& err, std::size_t
bytes_transferred)
{
printf("%d\n", bytes_transferred);
if (!err){
   process_data();
}
}

void test_serial_port( int argc, char* argv[]  )
{
// hard coded parameters
const char *PORT = "COM1";
serial_port_base::baud_rate BAUD(9600);
serial_port_base::character_size CSIZE( 8 );
serial_port_base::flow_control FLOW(
serial_port_base::flow_control::software );
serial_port_base::parity PARITY( serial_port_base::parity::none );
serial_port_base::stop_bits STOP( serial_port_base::stop_bits::one );

io_service io;
serial_port port( io, PORT );

// go through and set all the options as we need them
// all of them are listed, but the default values work for most cases
port.set_option( BAUD );
port.set_option( CSIZE );
port.set_option( FLOW );
port.set_option( PARITY );
port.set_option( STOP );

while( !kbhit() )
{
    io.reset();

    port.async_read_some( 
        boost::asio::buffer(data, BUF_SIZE), 
        boost::bind(&my_handler, boost::asio::placeholders::error,
                    boost::asio::placeholders::bytes_transferred )
        );

    io.run();

    Sleep(300);
}
}

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