/*- * This file is provided under a dual BSD/GPLv2 license. When using or * redistributing this file, you may do so under either license. * * GPL LICENSE SUMMARY * * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program 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 this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. * The full GNU General Public License is included in this distribution * in the file called LICENSE.GPL. * * BSD LICENSE * * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); /** * @file * * @brief This file contains all of the functionality common to all state * machine object implementations. */ #include #define SCI_STATE_MACHINE_EXIT_STATE(state_machine) \ if ( \ ((state_machine)->state_table[(state_machine)->current_state_id].\ exit_state != NULL) \ ) \ { \ ((state_machine)->state_table[(state_machine)->current_state_id].\ exit_state((state_machine)->state_machine_owner)); \ } #define SCI_STATE_MACHINE_ENTER_STATE(state_machine) \ ((state_machine)->state_table[(state_machine)->current_state_id].\ enter_state((state_machine)->state_machine_owner)) #define SCI_STATE_MACHINE_SET_STATE(state_machine, id) \ ((state_machine)->current_state_id = (id)) //****************************************************************************** //* P R O T E C T E D M E T H O D S //****************************************************************************** /** * @brief This method will set the initial state and state table * for the state machine. The caller should follow this * request with the initialize request to cause the state * machine to start. * * @param[in] this_state_machine This parameter provides the state machine * object to be constructed. * @param[in] state_machine_owner This parameter indicates the object that * is owns the state machine being constructed. * @param[in] state_table This parameter specifies the table of state objects * that is managed by this state machine. * @param[in] initial_state This parameter specifies the value of the initial * state for this state machine. * * @return none */ void sci_base_state_machine_construct( SCI_BASE_STATE_MACHINE_T * this_state_machine, SCI_BASE_OBJECT_T * my_state_machine_owner, SCI_BASE_STATE_T * state_table, U32 initial_state ) { #if defined(SCI_LOGGING) sci_base_subject_construct(&this_state_machine->parent); #endif // defined(SCI_LOGGING) this_state_machine->state_machine_owner = my_state_machine_owner; this_state_machine->initial_state_id = initial_state; this_state_machine->previous_state_id = initial_state; this_state_machine->current_state_id = initial_state; this_state_machine->state_table = state_table; } /** * @brief This method will cause the state machine to enter the * initial state. * * @see sci_base_state_machine_construct() for how to set the initial state * * @param[in] this_state_machine This parameter specifies the state machine * that is to be started. * * @return none */ void sci_base_state_machine_start( SCI_BASE_STATE_MACHINE_T *this_state_machine ) { SCI_STATE_MACHINE_SET_STATE( this_state_machine, this_state_machine->initial_state_id ); #if defined(SCI_BASE_ENABLE_SUBJECT_NOTIFICATION) sci_base_subject_notify(&this_state_machine->parent); #endif SCI_STATE_MACHINE_ENTER_STATE(this_state_machine); } /** * @brief This method will cause the state machine to exit it's current * state only. * * @param[in] this_state_machine This parameter specifies the state machine * that is to be stopped. * * @return none */ void sci_base_state_machine_stop( SCI_BASE_STATE_MACHINE_T *this_state_machine ) { SCI_STATE_MACHINE_EXIT_STATE(this_state_machine); #if defined(SCI_BASE_ENABLE_SUBJECT_NOTIFICATION) sci_base_subject_notify(&this_state_machine->parent); #endif } /** * @brief This method performs an update to the current state of * the state machine. * * @param[in] this_state_machine This parameter specifies the state machine * for which the caller wishes to perform a state change. * @param[in] next_state This parameter specifies the new state for the * state machine. * * @return none */ void sci_base_state_machine_change_state( SCI_BASE_STATE_MACHINE_T *this_state_machine, U32 next_state ) { SCI_STATE_MACHINE_EXIT_STATE(this_state_machine); this_state_machine->previous_state_id = this_state_machine->current_state_id; SCI_STATE_MACHINE_SET_STATE(this_state_machine, next_state); #if defined(SCI_BASE_ENABLE_SUBJECT_NOTIFICATION) // Notify of the state change prior to entering the state. sci_base_subject_notify(&this_state_machine->parent); #endif SCI_STATE_MACHINE_ENTER_STATE(this_state_machine); } /** * @brief This method simply returns the current state of the * state machine to the caller. * * @param[in] this_state_machine This parameter specifies the state * machine for which to retrieve the current state. * * @return This method returns a U32 value indicating the current state for * the supplied state machine. */ U32 sci_base_state_machine_get_state( SCI_BASE_STATE_MACHINE_T *this_state_machine ) { return this_state_machine->current_state_id; }