NAME

       ost::SerialService - The SerialService is a thead service object that is meant to service
       attached serial ports.

SYNOPSIS

       #include <serial.h>

       Inherits ost::Thread, and ost::Mutex.

   Public Member Functions
       void update (unsigned char flag=0xff)
           Notify service thread that a port has been added or removed, or a timer changed, so
           that a new schedule can be computed for expiring attached ports.
       SerialService (int pri=0, size_t stack=0, const char *id=NULL)
           Create a service thread for attaching serial ports.
       virtual ~SerialService ()
           Terminate the service thread and update attached objects.
       int getCount (void)
           Get current reference count.

   Protected Member Functions
       virtual void onUpdate (unsigned char flag)
           A virtual handler for processing user defined update requests (1-254) which have been
           posted through Update.
       virtual void onEvent (void)
           A virtual handler for event loop calls.
       virtual void onCallback (SerialPort *port)
           A virtual handler for adding support for additional callback events into SerialPort.

   Friends
       class SerialPort

   Additional Inherited Members

Detailed Description

       The SerialService is a thead service object that is meant to service attached serial
       ports.

       Multiple pool objects may be created and multiple serial ports may be attached to the same
       thread of of execution. This allows one to balance threads and the serial ports they
       service.

       The TTYPort and TTYService classes are used to form thread-pool serviced serial I/O
       protocol sets. These can be used when one has a large number of serial devices to manage,
       and a single (or limited number of) thread(s) can then be used to service the tty port
       objects present. Each tty port supports a timer control and several virtual methods that
       the service thread can call when events occur. This model provides for 'callback' event
       management, whereby the service thread performs a 'callback' into the port object when
       events occur. Specific events supported include the expiration of a TTYPort timer, pending
       input data waiting to be read, and 'sighup' connection breaks.

       Author:
           David Sugar dyfet@ostel.com Thread pool service for serial ports.

Constructor & Destructor Documentation

   ost::SerialService::SerialService (int pri = 0, size_t stack = 0, const char * id = NULL)
       Create a service thread for attaching serial ports. The thread begins execution with the
       first attached port.

       Parameters:
           pri of this thread to run under.
           stack stack size.
           id stack ID.

   virtual ost::SerialService::~SerialService () [virtual]
       Terminate the service thread and update attached objects.

Member Function Documentation

   int ost::SerialService::getCount (void) [inline]
       Get current reference count. This can be used when selecting the lead used service handler
       from a pool.

       Returns:
           count of active ports.

   virtual void ost::SerialService::onCallback (SerialPort * port) [protected],  [virtual]
       A virtual handler for adding support for additional callback events into SerialPort.

       Parameters:
           port serial port currently being evaluated.

   virtual void ost::SerialService::onEvent (void) [protected],  [virtual]
       A virtual handler for event loop calls. This can be used to extend event loop processing.

   virtual void ost::SerialService::onUpdate (unsigned char flag) [protected],  [virtual]
       A virtual handler for processing user defined update requests (1-254) which have been
       posted through Update.

       Parameters:
           flag of update request.

   void ost::SerialService::update (unsigned char flag = 0xff)
       Notify service thread that a port has been added or removed, or a timer changed, so that a
       new schedule can be computed for expiring attached ports. This can also be used to pass
       requests to the OnUpdate() event handler.

       Parameters:
           flag event for OnUpdate, termination, or reschedule.

Friends And Related Function Documentation

   friend class SerialPort [friend]

Author

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