4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2005 Develer S.r.l. (http://www.develer.com/)
32 * \brief Notifier obj (interface).
34 * \author Bernie Innocenti <bernie@codewiz.org>
35 * \author Francesco Sacchi <batt@develer.com>
38 #ifndef DT_DNOTIFIER_H
39 #define DT_DNOTIFIER_H
41 #include <cfg/debug.h>
44 #include <struct/list.h>
50 typedef void (* update_func_ptr)(struct DNotifier *, dtag_t, dval_t);
51 typedef void (* update_filter_ptr)(struct DFilter *, dtag_t, dval_t);
54 * Base object for receive and forward messages.
55 * It contains an update function used to update itslef and a list to
56 * notify other DNotifer eventually connected.
58 typedef struct DNotifier
60 /// Receive new attributes from other notifiers.
61 update_func_ptr update;
63 /// List of target notifiers to set new attributes to.
69 * Used to translate src message to dst message.
71 typedef struct DFilterMap
79 * A filter is an interface between two notifier.
80 * It can translate messages between them through a map (if it is not null).
82 typedef struct DFilter
84 /// Allow creating a list of dfilter objects.
87 /// Target of the filter
90 /// Update function called by the source dnotifier
91 update_filter_ptr update;
93 ///Map for translating messages for target
94 const DFilterMap *map;
96 ///Used in debug to prevent inserting this filter in more than one list
100 /// Type for filter-mask checking
101 typedef unsigned int dfilter_mask_t;
104 void filter_init(DFilter *f, const DFilterMap *map, bool masked, DNotifier *source, DNotifier *target);
106 /// Filter update function without masking capabilities.
107 void filter_update(DFilter *f, dtag_t tag, dval_t val);
109 /// Filter update function with masking capabilities.
110 void filter_mask_update(DFilter *f, dtag_t tag, dval_t val);
113 void notifier_init(DNotifier *n);
117 * Macro to notify the target object.
119 INLINE void dnotify(DNotifier *target, dtag_t tag, dval_t val)
122 target->update(target, tag, val);
126 * Macro to notify all the targets of \a target object.
128 INLINE void dnotify_targets(DNotifier *target, dtag_t tag, dval_t val)
131 if (!LIST_EMPTY(&target->targets))
132 FOREACH_NODE(f, &target->targets)
133 f->update(f, tag, val);
138 * Macro that connect \a src notifier to \a tgt using \a map and passing \a opt for filtering option.
139 * It declares a static filter to achieve connection and messages translation.
140 * \note Due its static filter declaration, DCONNECT MUST NOT be used inside loops or in functions called multiple times.
141 * Failing to do so will lead to unpredictable connections between notifiers.
143 #define DCONNECT(src, tgt, map, opt) \
145 static DFilter _filter_; /* Declare a filter */ \
146 filter_init(&(_filter_), map, opt, src, tgt); /* Init it. */ \
150 #endif /* DT_DNOTIFIER_H */