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. */
41 enum workarounds workaround;
44 typedef struct XCBReplyData {
47 XCBGenericError **error;
50 static int match_request_error(const void *request, const void *data)
52 const XCBGenericError *e = data;
53 return e->response_type == 0 && e->sequence == ((*(unsigned int *) request) & 0xffff);
56 static int match_reply(const void *request, const void *data)
58 return ((XCBReplyData *) data)->request == *(unsigned int *) request;
61 static void wake_up_next_reader(XCBConnection *c)
63 XCBReplyData *cur = _xcb_list_peek_head(c->in.readers);
66 pthreadret = pthread_cond_signal(cur->data);
68 pthreadret = pthread_cond_signal(&c->in.event_cond);
69 assert(pthreadret == 0);
72 static int readn(const int fd, void *buf, const int buflen, int *count)
74 int n = read(fd, ((char *) buf) + *count, buflen - *count);
80 static int read_packet(XCBConnection *c)
86 /* Wait for there to be enough data for us to read a whole packet */
87 if(c->in.queue_len < length)
90 /* Get the response type, length, and sequence number. */
91 memcpy(&genrep, c->in.queue, sizeof(genrep));
93 /* Compute 32-bit sequence number of this packet. */
94 if((genrep.response_type & 0x7f) != KeymapNotify)
96 int lastread = c->in.request_read;
97 c->in.request_read = (lastread & 0xffff0000) | genrep.sequence;
98 if(c->in.request_read != lastread && !_xcb_queue_is_empty(c->in.current_reply))
100 _xcb_map_put(c->in.replies, lastread, c->in.current_reply);
101 c->in.current_reply = _xcb_queue_new();
103 if(c->in.request_read < lastread)
104 c->in.request_read += 0x10000;
107 /* For reply packets, check that the entire packet is available. */
108 if(genrep.response_type == 1)
110 pending_reply *pend = _xcb_list_peek_head(c->in.pending_replies);
111 if(pend && pend->request == c->in.request_read)
113 switch(pend->workaround)
115 case WORKAROUND_NONE:
117 case WORKAROUND_GLX_GET_FB_CONFIGS_BUG:
119 CARD32 *p = (CARD32 *) c->in.queue;
120 genrep.length = p[2] * p[3] * 2;
124 free(_xcb_queue_dequeue(c->in.pending_replies));
126 length += genrep.length * 4;
129 buf = malloc(length);
132 if(_xcb_in_read_block(c, buf, length) <= 0)
138 if(buf[0] == 1) /* response is a reply */
140 XCBReplyData *reader = _xcb_list_find(c->in.readers, match_reply, &c->in.request_read);
141 _xcb_queue_enqueue(c->in.current_reply, buf);
143 pthread_cond_signal(reader->data);
147 if(buf[0] == 0) /* response is an error */
149 XCBReplyData *reader = _xcb_list_find(c->in.readers, match_reply, &c->in.request_read);
150 if(reader && reader->error)
152 *reader->error = (XCBGenericError *) buf;
153 pthread_cond_signal(reader->data);
158 /* event, or error without a waiting reader */
159 _xcb_queue_enqueue(c->in.events, buf);
160 pthread_cond_signal(&c->in.event_cond);
161 return 1; /* I have something for you... */
164 /* Public interface */
166 void *XCBWaitForReply(XCBConnection *c, unsigned int request, XCBGenericError **e)
168 pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
174 pthread_mutex_lock(&c->iolock);
176 /* If this request has not been written yet, write it. */
177 if((signed int) (c->out.request_written - request) < 0)
178 if(!_xcb_out_flush(c))
179 goto done; /* error */
181 if(_xcb_list_find(c->in.readers, match_reply, &request))
182 goto done; /* error */
186 *e = _xcb_list_remove(c->in.events, match_request_error, &request);
191 reader.request = request;
194 _xcb_list_append(c->in.readers, &reader);
196 /* If this request has not been read yet, wait for it. */
197 while(!(e && *e) && ((signed int) (c->in.request_read - request) < 0 ||
198 (c->in.request_read == request &&
199 _xcb_queue_is_empty(c->in.current_reply))))
200 if(!_xcb_conn_wait(c, /*should_write*/ 0, &cond))
203 if(c->in.request_read != request)
205 _xcb_queue *q = _xcb_map_get(c->in.replies, request);
208 ret = _xcb_queue_dequeue(q);
209 if(_xcb_queue_is_empty(q))
210 _xcb_queue_delete(_xcb_map_remove(c->in.replies, request), free);
214 ret = _xcb_queue_dequeue(c->in.current_reply);
217 _xcb_list_remove(c->in.readers, match_reply, &request);
218 pthread_cond_destroy(&cond);
220 wake_up_next_reader(c);
221 pthread_mutex_unlock(&c->iolock);
225 XCBGenericEvent *XCBWaitEvent(XCBConnection *c)
227 return XCBWaitForEvent(c);
230 XCBGenericEvent *XCBWaitForEvent(XCBConnection *c)
232 XCBGenericEvent *ret;
235 fprintf(stderr, "Entering XCBWaitEvent\n");
238 pthread_mutex_lock(&c->iolock);
239 /* _xcb_list_remove_head returns 0 on empty list. */
240 while(!(ret = _xcb_queue_dequeue(c->in.events)))
241 if(!_xcb_conn_wait(c, /*should_write*/ 0, &c->in.event_cond))
244 wake_up_next_reader(c);
245 pthread_mutex_unlock(&c->iolock);
248 fprintf(stderr, "Leaving XCBWaitEvent, event type %d\n", ret ? ret->response_type : -1);
254 XCBGenericEvent *XCBPollForEvent(XCBConnection *c, int *error)
256 XCBGenericEvent *ret = 0;
257 pthread_mutex_lock(&c->iolock);
260 /* FIXME: follow X meets Z architecture changes. */
262 ret = _xcb_queue_dequeue(c->in.events);
267 fprintf(stderr, "XCBPollForEvent: I/O error occured, but no handler provided.\n");
270 pthread_mutex_unlock(&c->iolock);
274 unsigned int XCBGetRequestRead(XCBConnection *c)
277 pthread_mutex_lock(&c->iolock);
278 /* FIXME: follow X meets Z architecture changes. */
280 ret = c->in.request_read;
281 pthread_mutex_unlock(&c->iolock);
285 /* Private interface */
287 int _xcb_in_init(_xcb_in *in)
289 if(pthread_cond_init(&in->event_cond, 0))
295 in->request_read = 0;
296 in->current_reply = _xcb_queue_new();
298 in->replies = _xcb_map_new();
299 in->events = _xcb_queue_new();
300 in->readers = _xcb_list_new();
302 in->pending_replies = _xcb_queue_new();
303 if(!in->current_reply || !in->replies || !in->events || !in->readers || !in->pending_replies)
309 void _xcb_in_destroy(_xcb_in *in)
311 pthread_cond_destroy(&in->event_cond);
312 _xcb_queue_delete(in->current_reply, free);
313 _xcb_map_delete(in->replies, free);
314 _xcb_queue_delete(in->events, free);
315 _xcb_list_delete(in->readers, 0);
316 _xcb_queue_delete(in->pending_replies, free);
319 int _xcb_in_expect_reply(XCBConnection *c, unsigned int request, enum workarounds workaround)
321 if(workaround != WORKAROUND_NONE)
323 pending_reply *pend = malloc(sizeof(pending_reply));
326 pend->request = request;
327 pend->workaround = workaround;
328 if(!_xcb_queue_enqueue(c->in.pending_replies, pend))
337 int _xcb_in_read(XCBConnection *c)
339 int n = readn(c->fd, c->in.queue, sizeof(c->in.queue), &c->in.queue_len);
340 while(read_packet(c))
342 return (n > 0) || (n < 0 && errno == EAGAIN);
345 int _xcb_in_read_block(XCBConnection *c, void *buf, int len)
347 int done = c->in.queue_len;
351 memcpy(buf, c->in.queue, done);
352 c->in.queue_len -= done;
353 memmove(c->in.queue, c->in.queue + done, c->in.queue_len);
357 int ret = _xcb_read_block(c->fd, (char *) buf + done, len - done);