4 Copyright (C) 1999 Timo Sirainen
6 This program 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include "../common.h"
25 #define SIGNAL_LISTS 3
28 int id; /* signal id */
30 int emitting; /* signal is being emitted */
31 int altered; /* some signal functions are marked as NULL */
32 int stop_emit; /* this signal was stopped */
34 GPtrArray *modulelist[SIGNAL_LISTS]; /* list of what signals belong
36 GPtrArray *siglist[SIGNAL_LISTS]; /* signal lists */
39 #define signal_is_emitlist_empty(a) \
40 (!(a)->siglist[0] && !(a)->siglist[1] && !(a)->siglist[2])
42 static GMemChunk *signals_chunk;
43 static GHashTable *signals;
44 static SIGNAL_REC *current_emitted_signal;
46 void signal_add_to(const char *module, int pos,
47 const char *signal, SIGNAL_FUNC func)
49 g_return_if_fail(signal != NULL);
51 signal_add_to_id(module, pos, signal_get_uniq_id(signal), func);
55 void signal_add_to_id(const char *module, int pos,
56 int signal_id, SIGNAL_FUNC func)
60 g_return_if_fail(signal_id >= 0);
61 g_return_if_fail(func != NULL);
62 g_return_if_fail(pos >= 0 && pos < SIGNAL_LISTS);
64 rec = g_hash_table_lookup(signals, GINT_TO_POINTER(signal_id));
66 rec = g_mem_chunk_alloc0(signals_chunk);
68 g_hash_table_insert(signals, GINT_TO_POINTER(signal_id), rec);
71 if (rec->siglist[pos] == NULL) {
72 rec->siglist[pos] = g_ptr_array_new();
73 rec->modulelist[pos] = g_ptr_array_new();
76 g_ptr_array_add(rec->siglist[pos], (void *) func);
77 g_ptr_array_add(rec->modulelist[pos], (void *) module);
80 /* Destroy the whole signal */
81 static void signal_destroy(int signal_id)
85 rec = g_hash_table_lookup(signals, GINT_TO_POINTER(signal_id));
87 /* remove whole signal from memory */
88 g_hash_table_remove(signals, GINT_TO_POINTER(signal_id));
93 static int signal_list_find(GPtrArray *array, void *data)
97 for (n = 0; n < array->len; n++) {
98 if (g_ptr_array_index(array, n) == data)
105 static void signal_remove_from_list(SIGNAL_REC *rec, int signal_id,
109 g_ptr_array_index(rec->siglist[list], index) = NULL;
112 g_ptr_array_remove_index(rec->siglist[list], index);
113 g_ptr_array_remove_index(rec->modulelist[list], index);
114 if (signal_is_emitlist_empty(rec))
115 signal_destroy(signal_id);
119 /* Remove signal from emit lists */
120 static int signal_remove_from_lists(SIGNAL_REC *rec, int signal_id,
125 for (n = 0; n < SIGNAL_LISTS; n++) {
126 if (rec->siglist[n] == NULL)
129 index = signal_list_find(rec->siglist[n], (void *) func);
131 /* remove the function from emit list */
132 signal_remove_from_list(rec, signal_id, n, index);
140 void signal_remove_id(int signal_id, SIGNAL_FUNC func)
144 g_return_if_fail(signal_id >= 0);
145 g_return_if_fail(func != NULL);
147 rec = g_hash_table_lookup(signals, GINT_TO_POINTER(signal_id));
149 signal_remove_from_lists(rec, signal_id, func);
153 void signal_remove(const char *signal, SIGNAL_FUNC func)
155 g_return_if_fail(signal != NULL);
157 signal_remove_id(signal_get_uniq_id(signal), func);
160 /* Remove all NULL functions from signal list */
161 static void signal_list_clean(SIGNAL_REC *rec)
165 for (n = 0; n < SIGNAL_LISTS; n++) {
166 if (rec->siglist[n] == NULL)
169 for (index = rec->siglist[n]->len-1; index >= 0; index--) {
170 if (g_ptr_array_index(rec->siglist[n], index) == NULL) {
171 g_ptr_array_remove_index(rec->siglist[n], index);
172 g_ptr_array_remove_index(rec->modulelist[n], index);
178 static int signal_emit_real(SIGNAL_REC *rec, gconstpointer *arglist)
180 SIGNAL_REC *prev_emitted_signal;
182 int n, index, stopped, stop_emit_count;
184 /* signal_stop_by_name("signal"); signal_emit("signal", ...);
185 fails if we compare rec->stop_emit against 0. */
186 stop_emit_count = rec->stop_emit;
190 for (n = 0; n < SIGNAL_LISTS; n++) {
191 /* run signals in emit lists */
192 if (rec->siglist[n] == NULL)
195 for (index = rec->siglist[n]->len-1; index >= 0; index--) {
196 func = (SIGNAL_FUNC) g_ptr_array_index(rec->siglist[n], index);
199 prev_emitted_signal = current_emitted_signal;
200 current_emitted_signal = rec;
201 #if SIGNAL_MAX_ARGUMENTS != 6
202 # error SIGNAL_MAX_ARGS changed - update code
204 func(arglist[0], arglist[1], arglist[2], arglist[3], arglist[4], arglist[5]);
205 current_emitted_signal = prev_emitted_signal;
208 if (rec->stop_emit != stop_emit_count) {
218 if (!rec->emitting) {
219 if (rec->stop_emit != 0) {
220 /* signal_stop() used too many times */
224 signal_list_clean(rec);
225 rec->altered = FALSE;
232 static int signal_emitv_id(int signal_id, int params, va_list va)
234 gconstpointer arglist[SIGNAL_MAX_ARGUMENTS];
238 g_return_val_if_fail(signal_id >= 0, FALSE);
239 g_return_val_if_fail(params >= 0 && params <= SIGNAL_MAX_ARGUMENTS, FALSE);
241 for (n = 0; n < SIGNAL_MAX_ARGUMENTS; n++)
242 arglist[n] = n >= params ? NULL : va_arg(va, gconstpointer);
244 rec = g_hash_table_lookup(signals, GINT_TO_POINTER(signal_id));
245 if (rec != NULL && signal_emit_real(rec, arglist))
251 int signal_emit(const char *signal, int params, ...)
257 signal_id = signal_get_uniq_id(signal);
259 va_start(va, params);
260 ret = signal_emitv_id(signal_id, params, va);
266 int signal_emit_id(int signal_id, int params, ...)
272 va_start(va, params);
273 ret = signal_emitv_id(signal_id, params, va);
279 /* stop the current ongoing signal emission */
280 void signal_stop(void)
284 rec = current_emitted_signal;
286 g_warning("signal_stop() : no signals are being emitted currently");
287 else if (rec->emitting > rec->stop_emit)
291 /* stop ongoing signal emission by signal name */
292 void signal_stop_by_name(const char *signal)
297 signal_id = signal_get_uniq_id(signal);
298 rec = g_hash_table_lookup(signals, GINT_TO_POINTER(signal_id));
300 g_warning("signal_stop_by_name() : unknown signal \"%s\"", signal);
301 else if (rec->emitting > rec->stop_emit)
305 /* return the name of the signal that is currently being emitted */
306 const char *signal_get_emitted(void)
308 return signal_get_id_str(signal_get_emitted_id());
311 /* return the ID of the signal that is currently being emitted */
312 int signal_get_emitted_id(void)
316 rec = current_emitted_signal;
317 g_return_val_if_fail(rec != NULL, -1);
321 /* return TRUE if specified signal was stopped */
322 int signal_is_stopped(int signal_id)
326 rec = g_hash_table_lookup(signals, GINT_TO_POINTER(signal_id));
327 g_return_val_if_fail(rec != NULL, FALSE);
329 return rec->emitting <= rec->stop_emit;
332 static void signal_remove_module(void *signal, SIGNAL_REC *rec,
338 signal_id = GPOINTER_TO_INT(signal);
340 for (list = 0; list < SIGNAL_LISTS; list++) {
341 if (rec->modulelist[list] == NULL)
344 for (index = 0; index < rec->modulelist[list]->len; index++) {
345 if (g_strcasecmp(g_ptr_array_index(rec->modulelist[list], index), module) == 0)
346 signal_remove_from_list(rec, signal_id, list, index);
351 /* remove all signals that belong to `module' */
352 void signals_remove_module(const char *module)
354 g_return_if_fail(module != NULL);
356 g_hash_table_foreach(signals, (GHFunc) signal_remove_module, (void *) module);
359 void signals_init(void)
361 signals_chunk = g_mem_chunk_new("signals", sizeof(SIGNAL_REC),
362 sizeof(SIGNAL_REC)*200, G_ALLOC_AND_FREE);
363 signals = g_hash_table_new((GHashFunc) g_direct_hash, (GCompareFunc) g_direct_equal);
366 static void signal_free(void *key, SIGNAL_REC *rec)
370 for (n = 0; n < SIGNAL_LISTS; n++) {
371 if (rec->siglist[n] != NULL) {
372 g_ptr_array_free(rec->siglist[n], TRUE);
373 g_ptr_array_free(rec->modulelist[n], TRUE);
377 g_mem_chunk_free(signals_chunk, rec);
378 current_emitted_signal = NULL;
381 void signals_deinit(void)
383 g_hash_table_foreach(signals, (GHFunc) signal_free, NULL);
384 g_hash_table_destroy(signals);
386 module_uniq_destroy("signals");
387 g_mem_chunk_destroy(signals_chunk);