1 /* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
3 * Permission is hereby granted, free of charge, to any person obtaining a
4 * copy of this software and associated documentation files (the "Software"),
5 * to deal in the Software without restriction, including without limitation
6 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
7 * and/or sell copies of the Software, and to permit persons to whom the
8 * Software is furnished to do so, subject to the following conditions:
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
17 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
18 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20 * Except as contained in this notice, the names of the authors or their
21 * institutions shall not be used in advertising or otherwise to promote the
22 * sale, use or other dealings in this Software without prior written
23 * authorization from the authors.
26 /* Stuff that reads stuff from the server. */
40 enum workarounds workaround;
43 typedef struct XCBReplyData {
46 XCBGenericError **error;
49 static int match_request_error(const void *request, const void *data)
51 const XCBGenericError *e = data;
52 return e->response_type == 0 && e->sequence == ((*(unsigned int *) request) & 0xffff);
55 static int match_reply(const void *request, const void *data)
57 return ((XCBReplyData *) data)->request == *(unsigned int *) request;
60 static void wake_up_next_reader(XCBConnection *c)
62 XCBReplyData *cur = _xcb_list_peek_head(c->in.readers);
65 pthreadret = pthread_cond_signal(cur->data);
67 pthreadret = pthread_cond_signal(&c->in.event_cond);
68 assert(pthreadret == 0);
71 /* Public interface */
73 void *XCBWaitForReply(XCBConnection *c, unsigned int request, XCBGenericError **e)
75 pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
81 pthread_mutex_lock(&c->iolock);
83 /* If this request has not been written yet, write it. */
84 if((signed int) (c->out.request_written - request) < 0)
85 if(_xcb_out_flush(c) <= 0)
86 goto done; /* error */
88 if(_xcb_list_find(c->in.readers, match_reply, &request))
89 goto done; /* error */
93 *e = _xcb_list_remove(c->in.events, match_request_error, &request);
98 reader.request = request;
101 _xcb_list_append(c->in.readers, &reader);
103 /* If this request has not been read yet, wait for it. */
104 while(!(e && *e) && ((signed int) (c->in.request_read - request) < 0 ||
105 (c->in.request_read == request &&
106 _xcb_queue_is_empty(c->in.current_reply))))
107 if(_xcb_conn_wait(c, /*should_write*/ 0, &cond) <= 0)
110 if(c->in.request_read != request)
112 _xcb_queue *q = _xcb_map_get(c->in.replies, request);
115 ret = _xcb_queue_dequeue(q);
116 if(_xcb_queue_is_empty(q))
117 _xcb_queue_delete(_xcb_map_remove(c->in.replies, request), free);
121 ret = _xcb_queue_dequeue(c->in.current_reply);
124 _xcb_list_remove(c->in.readers, match_reply, &request);
125 pthread_cond_destroy(&cond);
127 wake_up_next_reader(c);
128 pthread_mutex_unlock(&c->iolock);
132 XCBGenericEvent *XCBWaitEvent(XCBConnection *c)
134 return XCBWaitForEvent(c);
137 XCBGenericEvent *XCBWaitForEvent(XCBConnection *c)
139 XCBGenericEvent *ret;
142 fprintf(stderr, "Entering XCBWaitEvent\n");
145 pthread_mutex_lock(&c->iolock);
146 /* _xcb_list_remove_head returns 0 on empty list. */
147 while(!(ret = _xcb_queue_dequeue(c->in.events)))
148 if(_xcb_conn_wait(c, /*should_write*/ 0, &c->in.event_cond) <= 0)
151 wake_up_next_reader(c);
152 pthread_mutex_unlock(&c->iolock);
155 fprintf(stderr, "Leaving XCBWaitEvent, event type %d\n", ret ? ret->response_type : -1);
161 XCBGenericEvent *XCBPollForEvent(XCBConnection *c, int *error)
163 XCBGenericEvent *ret = 0;
164 pthread_mutex_lock(&c->iolock);
167 /* FIXME: follow X meets Z architecture changes. */
168 if(_xcb_in_read(c) >= 0)
169 ret = _xcb_queue_dequeue(c->in.events);
174 fprintf(stderr, "XCBPollForEvent: I/O error occured, but no handler provided.\n");
177 pthread_mutex_unlock(&c->iolock);
181 unsigned int XCBGetRequestRead(XCBConnection *c)
184 pthread_mutex_lock(&c->iolock);
185 /* FIXME: follow X meets Z architecture changes. */
187 ret = c->in.request_read;
188 pthread_mutex_unlock(&c->iolock);
192 /* Private interface */
194 int _xcb_in_init(_xcb_in *in)
196 if(pthread_cond_init(&in->event_cond, 0))
202 in->request_read = 0;
203 in->current_reply = _xcb_queue_new();
205 in->replies = _xcb_map_new();
206 in->events = _xcb_queue_new();
207 in->readers = _xcb_list_new();
209 in->pending_replies = _xcb_queue_new();
210 if(!in->current_reply || !in->replies || !in->events || !in->readers || !in->pending_replies)
216 void _xcb_in_destroy(_xcb_in *in)
218 pthread_cond_destroy(&in->event_cond);
219 _xcb_queue_delete(in->current_reply, free);
220 _xcb_map_delete(in->replies, free);
221 _xcb_queue_delete(in->events, free);
222 _xcb_list_delete(in->readers, 0);
223 _xcb_queue_delete(in->pending_replies, free);
226 int _xcb_in_expect_reply(XCBConnection *c, unsigned int request, enum workarounds workaround)
228 if(workaround != WORKAROUND_NONE)
230 pending_reply *pend = malloc(sizeof(pending_reply));
233 pend->request = request;
234 pend->workaround = workaround;
235 if(!_xcb_queue_enqueue(c->in.pending_replies, pend))
244 int _xcb_in_read_packet(XCBConnection *c)
246 XCBGenericRep genrep;
250 /* Wait for there to be enough data for us to read a whole packet */
251 if(c->in.queue_len < length)
254 /* Get the response type, length, and sequence number. */
255 memcpy(&genrep, c->in.queue, sizeof(genrep));
257 /* Compute 32-bit sequence number of this packet. */
258 if((genrep.response_type & 0x7f) != KeymapNotify)
260 int lastread = c->in.request_read;
261 c->in.request_read = (lastread & 0xffff0000) | genrep.sequence;
262 if(c->in.request_read != lastread && !_xcb_queue_is_empty(c->in.current_reply))
264 _xcb_map_put(c->in.replies, lastread, c->in.current_reply);
265 c->in.current_reply = _xcb_queue_new();
267 if(c->in.request_read < lastread)
268 c->in.request_read += 0x10000;
271 /* For reply packets, check that the entire packet is available. */
272 if(genrep.response_type == 1)
274 pending_reply *pend = _xcb_list_peek_head(c->in.pending_replies);
275 if(pend && pend->request == c->in.request_read)
277 switch(pend->workaround)
279 case WORKAROUND_NONE:
281 case WORKAROUND_GLX_GET_FB_CONFIGS_BUG:
283 CARD32 *p = (CARD32 *) c->in.queue;
284 genrep.length = p[2] * p[3] * 2;
288 free(_xcb_queue_dequeue(c->in.pending_replies));
290 length += genrep.length * 4;
293 buf = malloc(length);
296 if(_xcb_in_read_block(c, buf, length) <= 0)
302 if(buf[0] == 1) /* response is a reply */
304 XCBReplyData *reader = _xcb_list_find(c->in.readers, match_reply, &c->in.request_read);
305 _xcb_queue_enqueue(c->in.current_reply, buf);
307 pthread_cond_signal(reader->data);
311 if(buf[0] == 0) /* response is an error */
313 XCBReplyData *reader = _xcb_list_find(c->in.readers, match_reply, &c->in.request_read);
314 if(reader && reader->error)
316 *reader->error = (XCBGenericError *) buf;
317 pthread_cond_signal(reader->data);
322 /* event, or error without a waiting reader */
323 _xcb_queue_enqueue(c->in.events, buf);
324 pthread_cond_signal(&c->in.event_cond);
325 return 1; /* I have something for you... */
328 int _xcb_in_read(XCBConnection *c)
330 int n = _xcb_readn(c->fd, c->in.queue, sizeof(c->in.queue), &c->in.queue_len);
331 if(n < 0 && errno == EAGAIN)
333 while(_xcb_in_read_packet(c) > 0)
338 int _xcb_in_read_block(XCBConnection *c, void *buf, int len)
340 int done = c->in.queue_len;
344 memcpy(buf, c->in.queue, done);
345 c->in.queue_len -= done;
346 memmove(c->in.queue, c->in.queue + done, c->in.queue_len);
350 int ret = _xcb_read_block(c->fd, (char *) buf + done, len - done);