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1 | /************************************************************************ |
2 | * RSTP library - Rapid Spanning Tree (802.1t, 802.1w) | |
3 | * Copyright (C) 2001-2003 Optical Access | |
4 | * Author: Alex Rozin | |
5 | * | |
6 | * This file is part of RSTP library. | |
7 | * | |
8 | * RSTP library is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU Lesser General Public License as published by the | |
10 | * Free Software Foundation; version 2.1 | |
11 | * | |
12 | * RSTP library is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public License | |
18 | * along with RSTP library; see the file COPYING. If not, write to the Free | |
19 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | * 02111-1307, USA. | |
21 | **********************************************************************/ | |
22 | ||
23 | /* Generic (abstract state machine) state machine : 17.13, 17.14 */ | |
24 | ||
25 | #ifndef _STP_STATER_H__ | |
26 | #define _STP_STATER_H__ | |
27 | ||
28 | #define BEGIN 9999 /* distinct from any valid state */ | |
29 | ||
30 | typedef struct state_mach_t { | |
31 | struct state_mach_t* next; | |
32 | ||
33 | char* name; /* for debugging */ | |
34 | #ifdef STP_DBG | |
35 | char debug; /* 0- no dbg, 1 - port, 2 - stpm */ | |
36 | unsigned int ignoreHop2State; | |
37 | #endif | |
38 | ||
39 | Bool changeState; | |
40 | unsigned int State; | |
41 | ||
42 | void (* concreteEnterState) (struct state_mach_t * ); | |
43 | Bool (* concreteCheckCondition) (struct state_mach_t * ); | |
44 | char* (* concreteGetStatName) (int); | |
45 | union { | |
46 | struct stpm_t* stpm; | |
47 | struct port_t* port; | |
48 | void * owner; | |
49 | } owner; | |
50 | ||
51 | } STATE_MACH_T; | |
52 | ||
53 | #define STP_STATE_MACH_IN_LIST(WHAT) \ | |
54 | { \ | |
55 | STATE_MACH_T* abstr; \ | |
56 | \ | |
57 | abstr = STP_state_mach_create (STP_##WHAT##_enter_state, \ | |
58 | STP_##WHAT##_check_conditions, \ | |
59 | STP_##WHAT##_get_state_name, \ | |
60 | this, \ | |
61 | #WHAT); \ | |
62 | abstr->next = this->machines; \ | |
63 | this->machines = abstr; \ | |
64 | this->WHAT = abstr; \ | |
65 | } | |
66 | ||
67 | ||
68 | STATE_MACH_T * | |
69 | STP_state_mach_create (void (* concreteEnterState) (STATE_MACH_T*), | |
70 | Bool (* concreteCheckCondition) (STATE_MACH_T*), | |
71 | char * (* concreteGetStatName) (int), | |
72 | void* owner, char* name); | |
73 | ||
74 | void | |
75 | STP_state_mach_delete (STATE_MACH_T* this); | |
76 | ||
77 | Bool | |
78 | STP_check_condition (STATE_MACH_T* this); | |
79 | ||
80 | Bool | |
81 | STP_change_state (STATE_MACH_T* this); | |
82 | ||
83 | Bool | |
84 | STP_hop_2_state (STATE_MACH_T* this, unsigned int new_state); | |
85 | ||
86 | #endif /* _STP_STATER_H__ */ | |
87 |