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. */
43 XCBGenericEvent *event;
44 struct event_list *next;
49 struct reply_list *next;
52 typedef struct pending_reply {
54 enum workarounds workaround;
56 struct pending_reply *next;
59 typedef struct reader_list {
62 struct reader_list *next;
65 static void wake_up_next_reader(XCBConnection *c)
69 pthreadret = pthread_cond_signal(c->in.readers->data);
71 pthreadret = pthread_cond_signal(&c->in.event_cond);
72 assert(pthreadret == 0);
75 static int read_packet(XCBConnection *c)
80 pending_reply *pend = 0;
81 struct event_list *event;
83 /* Wait for there to be enough data for us to read a whole packet */
84 if(c->in.queue_len < length)
87 /* Get the response type, length, and sequence number. */
88 memcpy(&genrep, c->in.queue, sizeof(genrep));
90 /* Compute 32-bit sequence number of this packet. */
91 if((genrep.response_type & 0x7f) != XCBKeymapNotify)
93 int lastread = c->in.request_read;
94 c->in.request_read = (lastread & 0xffff0000) | genrep.sequence;
95 if(c->in.request_read < lastread)
96 c->in.request_read += 0x10000;
97 if(c->in.request_read > c->in.request_expected)
98 c->in.request_expected = c->in.request_read;
100 if(c->in.request_read != lastread)
102 if(c->in.current_reply)
104 _xcb_map_put(c->in.replies, lastread, c->in.current_reply);
105 c->in.current_reply = 0;
106 c->in.current_reply_tail = &c->in.current_reply;
108 c->in.request_completed = c->in.request_read - 1;
110 if(genrep.response_type != XCBReply) /* error or event */
111 c->in.request_completed = c->in.request_read; /* XXX: does event/error imply no more replies? */
113 while(c->in.pending_replies && c->in.pending_replies->request <= c->in.request_completed)
115 pending_reply *oldpend = c->in.pending_replies;
116 c->in.pending_replies = oldpend->next;
118 c->in.pending_replies_tail = &c->in.pending_replies;
123 if(genrep.response_type == XCBError || genrep.response_type == XCBReply)
125 pend = c->in.pending_replies;
126 if(pend && pend->request != c->in.request_read)
130 /* For reply packets, check that the entire packet is available. */
131 if(genrep.response_type == XCBReply)
133 if(pend && pend->workaround == WORKAROUND_GLX_GET_FB_CONFIGS_BUG)
135 CARD32 *p = (CARD32 *) c->in.queue;
136 genrep.length = p[2] * p[3] * 2;
138 length += genrep.length * 4;
141 buf = malloc(length + (genrep.response_type == XCBReply ? 0 : sizeof(CARD32)));
144 if(_xcb_in_read_block(c, buf, length) <= 0)
149 if(pend && (pend->flags & XCB_REQUEST_DISCARD_REPLY))
155 if(genrep.response_type != XCBReply)
156 ((XCBGenericEvent *) buf)->full_sequence = c->in.request_read;
158 /* reply, or checked error */
159 if( genrep.response_type == XCBReply ||
160 (genrep.response_type == XCBError && pend && (pend->flags & XCB_REQUEST_CHECKED)))
163 struct reply_list *cur = malloc(sizeof(struct reply_list));
168 *c->in.current_reply_tail = cur;
169 c->in.current_reply_tail = &cur->next;
170 for(reader = c->in.readers; reader && reader->request <= c->in.request_read; reader = reader->next)
171 if(reader->request == c->in.request_read)
173 pthread_cond_signal(reader->data);
179 /* event, or unchecked error */
180 event = malloc(sizeof(struct event_list));
188 *c->in.events_tail = event;
189 c->in.events_tail = &event->next;
190 pthread_cond_signal(&c->in.event_cond);
191 return 1; /* I have something for you... */
194 static XCBGenericEvent *get_event(XCBConnection *c)
196 struct event_list *cur = c->in.events;
197 XCBGenericEvent *ret;
201 c->in.events = cur->next;
203 c->in.events_tail = &c->in.events;
208 static void free_reply_list(struct reply_list *head)
212 struct reply_list *cur = head;
219 static int read_block(const int fd, void *buf, const size_t len)
224 int ret = read(fd, ((char *) buf) + done, len - done);
227 if(ret < 0 && errno == EAGAIN)
232 ret = select(fd + 1, &fds, 0, 0, 0);
240 /* Public interface */
242 void *XCBWaitForReply(XCBConnection *c, unsigned int request, XCBGenericError **e)
244 pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
246 reader_list **prev_reader;
247 struct reply_list *head;
252 /* If an error occurred when issuing the request, fail immediately. */
256 pthread_mutex_lock(&c->iolock);
258 /* If this request has not been written yet, write it. */
259 if(!_xcb_out_flush_to(c, request))
260 goto done; /* error */
262 for(prev_reader = &c->in.readers; *prev_reader && (*prev_reader)->request <= request; prev_reader = &(*prev_reader)->next)
263 if((*prev_reader)->request == request)
264 goto done; /* error */
266 reader.request = request;
268 reader.next = *prev_reader;
269 *prev_reader = &reader;
271 /* If this request has not completed yet and has no reply waiting,
273 while(c->in.request_completed < request &&
274 !(c->in.request_read == request && c->in.current_reply))
275 if(!_xcb_conn_wait(c, &cond, 0, 0))
278 if(c->in.request_read != request)
280 head = _xcb_map_remove(c->in.replies, request);
281 if(head && head->next)
282 _xcb_map_put(c->in.replies, request, head->next);
286 head = c->in.current_reply;
289 c->in.current_reply = head->next;
291 c->in.current_reply_tail = &c->in.current_reply;
300 if(((XCBGenericRep *) ret)->response_type == XCBError)
311 for(prev_reader = &c->in.readers; *prev_reader && (*prev_reader)->request <= request; prev_reader = &(*prev_reader)->next)
312 if(*prev_reader == &reader)
314 *prev_reader = (*prev_reader)->next;
317 pthread_cond_destroy(&cond);
319 wake_up_next_reader(c);
320 pthread_mutex_unlock(&c->iolock);
324 XCBGenericEvent *XCBWaitEvent(XCBConnection *c)
326 return XCBWaitForEvent(c);
329 XCBGenericEvent *XCBWaitForEvent(XCBConnection *c)
331 XCBGenericEvent *ret;
332 pthread_mutex_lock(&c->iolock);
333 /* get_event returns 0 on empty list. */
334 while(!(ret = get_event(c)))
335 if(!_xcb_conn_wait(c, &c->in.event_cond, 0, 0))
338 wake_up_next_reader(c);
339 pthread_mutex_unlock(&c->iolock);
343 XCBGenericEvent *XCBPollForEvent(XCBConnection *c, int *error)
345 XCBGenericEvent *ret = 0;
346 pthread_mutex_lock(&c->iolock);
349 /* FIXME: follow X meets Z architecture changes. */
356 fprintf(stderr, "XCBPollForEvent: I/O error occured, but no handler provided.\n");
359 pthread_mutex_unlock(&c->iolock);
363 unsigned int XCBGetRequestRead(XCBConnection *c)
366 pthread_mutex_lock(&c->iolock);
367 /* FIXME: follow X meets Z architecture changes. */
369 ret = c->in.request_read;
370 pthread_mutex_unlock(&c->iolock);
374 /* Private interface */
376 int _xcb_in_init(_xcb_in *in)
378 if(pthread_cond_init(&in->event_cond, 0))
384 in->request_read = 0;
385 in->request_completed = 0;
387 in->replies = _xcb_map_new();
391 in->current_reply_tail = &in->current_reply;
392 in->events_tail = &in->events;
393 in->pending_replies_tail = &in->pending_replies;
398 void _xcb_in_destroy(_xcb_in *in)
400 pthread_cond_destroy(&in->event_cond);
401 free_reply_list(in->current_reply);
402 _xcb_map_delete(in->replies, (void (*)(void *)) free_reply_list);
405 struct event_list *e = in->events;
406 in->events = e->next;
410 while(in->pending_replies)
412 pending_reply *pend = in->pending_replies;
413 in->pending_replies = pend->next;
418 int _xcb_in_expect_reply(XCBConnection *c, unsigned int request, enum workarounds workaround, int flags)
420 if(workaround != WORKAROUND_NONE || flags != 0)
422 pending_reply *pend = malloc(sizeof(pending_reply));
425 pend->request = request;
426 pend->workaround = workaround;
429 *c->in.pending_replies_tail = pend;
430 c->in.pending_replies_tail = &pend->next;
435 int _xcb_in_read(XCBConnection *c)
437 int n = read(c->fd, c->in.queue + c->in.queue_len, sizeof(c->in.queue) - c->in.queue_len);
439 c->in.queue_len += n;
440 while(read_packet(c))
442 return (n > 0) || (n < 0 && errno == EAGAIN);
445 int _xcb_in_read_block(XCBConnection *c, void *buf, int len)
447 int done = c->in.queue_len;
451 memcpy(buf, c->in.queue, done);
452 c->in.queue_len -= done;
453 memmove(c->in.queue, c->in.queue + done, c->in.queue_len);
457 int ret = read_block(c->fd, (char *) buf + done, len - done);