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#ifndef CYGONCE_IO_SERIAL_MISC_TIMEOUT_INL

#define CYGONCE_IO_SERIAL_MISC_TIMEOUT_INL

//==========================================================================

//

//        timeout.inl

//

//        Simple timeout support for serial I/O testing.

//

//==========================================================================

// ####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later

// version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License

// along with eCos; if not, write to the Free Software Foundation, Inc.,

// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

//

// As a special exception, if other files instantiate templates or use

// macros or inline functions from this file, or you compile this file

// and link it with other works to produce a work based on this file,

// this file does not by itself cause the resulting work to be covered by

// the GNU General Public License. However the source code for this file

// must still be made available in accordance with section (3) of the GNU

// General Public License v2.

//

// This exception does not invalidate any other reasons why a work based

// on this file might be covered by the GNU General Public License.

// -------------------------------------------

// ####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     gthomas

// Contributors:  gthomas

// Date:          1999-02-05

// Description:   Simple timeout functions

//####DESCRIPTIONEND####

// Timeout support

typedef void (timeout_fun)(void *);

#ifndef NTIMEOUTS

#define NTIMEOUTS 8

#endif

typedef struct {

    cyg_int32     delta;  // Number of "ticks" in the future for this timeout

    timeout_fun  *fun;    // Function to execute when it expires

    void         *arg;    // Argument to pass when it does

} timeout_entry;

static timeout_entry timeouts[NTIMEOUTS];

static cyg_handle_t timeout_alarm_handle;

static cyg_alarm timeout_alarm;

static cyg_int32 last_delta;

static void

do_timeout(cyg_handle_t alarm, cyg_addrword_t data)

{

    int i;

    cyg_int32 min_delta;

    timeout_entry *e = timeouts;

    min_delta = 0x7FFFFFFF;  // Maxint

    for (i = 0;  i < NTIMEOUTS;  i++, e++) {

        if (e->delta) {

            e->delta -= last_delta;

            if (e->delta == 0) {

                // Time for this item to 'fire'

                (e->fun)(e->arg);

            } else {

                if (e->delta < min_delta) min_delta = e->delta;

            }

        }

    }

    if (min_delta != 0x7FFFFFFF) {

        // Still something to do, schedule it

        cyg_alarm_initialize(timeout_alarm_handle, cyg_current_time()+min_delta, 0);

        last_delta = min_delta;

    }

}

static cyg_uint32

timeout(cyg_int32 delta, timeout_fun *fun, void *arg)

{

    int i;

    cyg_int32 min_delta;

    static bool init = false;

    timeout_entry *e = timeouts;

    cyg_uint32 stamp;

    if (!init) {

        cyg_handle_t h;

        cyg_clock_to_counter(cyg_real_time_clock(), &h);

        cyg_alarm_create(h, do_timeout, 0, &timeout_alarm_handle, &timeout_alarm);

        init = true;

    }

    stamp = 0;  // Assume no slots available

    for (i = 0;  i < NTIMEOUTS;  i++, e++) {

        if ((e->delta == 0) && (e->fun == 0)) {

            // Free entry

            e->delta = delta;

            e->fun = fun;

            e->arg = arg;

            stamp = (cyg_uint32)e;

            break;

        }

    }

    e = timeouts;

    min_delta = 0x7FFFFFFF;

    for (i = 0;  i < NTIMEOUTS;  i++, e++) {

        if (e->delta && (e->delta < min_delta)) min_delta = e->delta;

    }

    if (min_delta != 0x7FFFFFFF) {

        // Still something to do, schedule it

        cyg_alarm_initialize(timeout_alarm_handle, cyg_current_time()+min_delta, 0);

        last_delta = min_delta;

    }

    return stamp;

}

static void

untimeout(cyg_uint32 stamp)

{

    if (stamp != 0) {

        timeout_entry *e = (timeout_entry *)stamp;

        if (e->fun != 0) {

            e->delta = 0;

            e->fun = 0;

            e->arg = 0;

        }

    }

}

#endif // CYGONCE_IO_SERIAL_MISC_TIMEOUT_INL