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 sends stuff to the server. */
38 static inline void send_request(xcb_connection_t *c, int isvoid, enum workarounds workaround, int flags, struct iovec *vector, int count)
45 c->in.request_expected = c->out.request;
46 if(workaround != WORKAROUND_NONE || flags != 0)
47 _xcb_in_expect_reply(c, c->out.request, workaround, flags);
49 while(count && c->out.queue_len + vector[0].iov_len <= sizeof(c->out.queue))
51 memcpy(c->out.queue + c->out.queue_len, vector[0].iov_base, vector[0].iov_len);
52 c->out.queue_len += vector[0].iov_len;
53 vector[0].iov_base = (char *) vector[0].iov_base + vector[0].iov_len;
54 vector[0].iov_len = 0;
61 vector[0].iov_base = c->out.queue;
62 vector[0].iov_len = c->out.queue_len;
64 _xcb_out_send(c, vector, count);
67 static void send_sync(xcb_connection_t *c)
76 } sync_req = { { /* GetInputFocus */ 43, 0, 1 } };
77 struct iovec vector[2];
78 vector[1].iov_base = (char *) &sync_req;
79 vector[1].iov_len = sizeof(sync_req);
80 send_request(c, 0, WORKAROUND_NONE, XCB_REQUEST_DISCARD_REPLY, vector + 1, 1);
83 static void get_socket_back(xcb_connection_t *c)
85 while(c->out.return_socket && c->out.socket_moving)
86 pthread_cond_wait(&c->out.socket_cond, &c->iolock);
87 if(!c->out.return_socket)
90 c->out.socket_moving = 1;
91 pthread_mutex_unlock(&c->iolock);
92 c->out.return_socket(c->out.socket_closure);
93 pthread_mutex_lock(&c->iolock);
94 c->out.socket_moving = 0;
96 pthread_cond_broadcast(&c->out.socket_cond);
97 c->out.return_socket = 0;
98 c->out.socket_closure = 0;
99 _xcb_in_replies_done(c);
102 /* Public interface */
104 void xcb_prefetch_maximum_request_length(xcb_connection_t *c)
108 pthread_mutex_lock(&c->out.reqlenlock);
109 if(c->out.maximum_request_length_tag == LAZY_NONE)
111 const xcb_query_extension_reply_t *ext;
112 ext = xcb_get_extension_data(c, &xcb_big_requests_id);
113 if(ext && ext->present)
115 c->out.maximum_request_length_tag = LAZY_COOKIE;
116 c->out.maximum_request_length.cookie = xcb_big_requests_enable(c);
120 c->out.maximum_request_length_tag = LAZY_FORCED;
121 c->out.maximum_request_length.value = c->setup->maximum_request_length;
124 pthread_mutex_unlock(&c->out.reqlenlock);
127 uint32_t xcb_get_maximum_request_length(xcb_connection_t *c)
131 xcb_prefetch_maximum_request_length(c);
132 pthread_mutex_lock(&c->out.reqlenlock);
133 if(c->out.maximum_request_length_tag == LAZY_COOKIE)
135 xcb_big_requests_enable_reply_t *r = xcb_big_requests_enable_reply(c, c->out.maximum_request_length.cookie, 0);
136 c->out.maximum_request_length_tag = LAZY_FORCED;
139 c->out.maximum_request_length.value = r->maximum_request_length;
143 c->out.maximum_request_length.value = c->setup->maximum_request_length;
145 pthread_mutex_unlock(&c->out.reqlenlock);
146 return c->out.maximum_request_length.value;
149 unsigned int xcb_send_request(xcb_connection_t *c, int flags, struct iovec *vector, const xcb_protocol_request_t *req)
153 int veclen = req->count;
154 enum workarounds workaround = WORKAROUND_NONE;
161 assert(req->count > 0);
163 if(!(flags & XCB_REQUEST_RAW))
165 static const char pad[3];
167 uint16_t shortlen = 0;
169 assert(vector[0].iov_len >= 4);
170 /* set the major opcode, and the minor opcode for extensions */
173 const xcb_query_extension_reply_t *extension = xcb_get_extension_data(c, req->ext);
174 if(!(extension && extension->present))
176 _xcb_conn_shutdown(c, XCB_CONN_CLOSED_EXT_NOTSUPPORTED);
179 ((uint8_t *) vector[0].iov_base)[0] = extension->major_opcode;
180 ((uint8_t *) vector[0].iov_base)[1] = req->opcode;
183 ((uint8_t *) vector[0].iov_base)[0] = req->opcode;
185 /* put together the length field, possibly using BIGREQUESTS */
186 for(i = 0; i < req->count; ++i)
188 longlen += vector[i].iov_len;
189 if(!vector[i].iov_base)
191 vector[i].iov_base = (char *) pad;
192 assert(vector[i].iov_len <= sizeof(pad));
195 assert((longlen & 3) == 0);
198 if(longlen <= c->setup->maximum_request_length)
200 /* we don't need BIGREQUESTS. */
204 else if(longlen > xcb_get_maximum_request_length(c))
206 _xcb_conn_shutdown(c, XCB_CONN_CLOSED_REQ_LEN_EXCEED);
207 return 0; /* server can't take this; maybe need BIGREQUESTS? */
210 /* set the length field. */
211 ((uint16_t *) vector[0].iov_base)[1] = shortlen;
214 prefix[0] = ((uint32_t *) vector[0].iov_base)[0];
215 prefix[1] = ++longlen;
216 vector[0].iov_base = (uint32_t *) vector[0].iov_base + 1;
217 vector[0].iov_len -= sizeof(uint32_t);
219 vector[0].iov_base = prefix;
220 vector[0].iov_len = sizeof(prefix);
223 flags &= ~XCB_REQUEST_RAW;
225 /* do we need to work around the X server bug described in glx.xml? */
226 /* XXX: GetFBConfigs won't use BIG-REQUESTS in any sane
227 * configuration, but that should be handled here anyway. */
228 if(req->ext && !req->isvoid && !strcmp(req->ext->name, "GLX") &&
229 ((req->opcode == 17 && ((uint32_t *) vector[0].iov_base)[1] == 0x10004) ||
231 workaround = WORKAROUND_GLX_GET_FB_CONFIGS_BUG;
233 /* get a sequence number and arrange for delivery. */
234 pthread_mutex_lock(&c->iolock);
235 /* wait for other writing threads to get out of my way. */
236 while(c->out.writing)
237 pthread_cond_wait(&c->out.cond, &c->iolock);
240 /* send GetInputFocus (sync_req) when 64k-2 requests have been sent without
242 if(req->isvoid && c->out.request == c->in.request_expected + (1 << 16) - 2)
244 /* Also send sync_req (could use NoOp) at 32-bit wrap to avoid having
245 * applications see sequence 0 as that is used to indicate
246 * an error in sending the request */
247 if((unsigned int) (c->out.request + 1) == 0)
250 /* The above send_sync calls could drop the I/O lock, but this
251 * thread will still exclude any other thread that tries to write,
252 * so the sequence number postconditions still hold. */
253 send_request(c, req->isvoid, workaround, flags, vector, veclen);
254 request = c->has_error ? 0 : c->out.request;
255 pthread_mutex_unlock(&c->iolock);
259 int xcb_take_socket(xcb_connection_t *c, void (*return_socket)(void *closure), void *closure, int flags, uint64_t *sent)
264 pthread_mutex_lock(&c->iolock);
267 /* _xcb_out_flush may drop the iolock allowing other threads to
268 * write requests, so keep flushing until we're done
271 ret = _xcb_out_flush_to(c, c->out.request);
272 while (ret && c->out.request != c->out.request_written);
275 c->out.return_socket = return_socket;
276 c->out.socket_closure = closure;
278 _xcb_in_expect_reply(c, c->out.request, WORKAROUND_EXTERNAL_SOCKET_OWNER, flags);
279 assert(c->out.request == c->out.request_written);
280 *sent = c->out.request;
282 pthread_mutex_unlock(&c->iolock);
286 int xcb_writev(xcb_connection_t *c, struct iovec *vector, int count, uint64_t requests)
291 pthread_mutex_lock(&c->iolock);
292 c->out.request += requests;
293 ret = _xcb_out_send(c, vector, count);
294 pthread_mutex_unlock(&c->iolock);
298 int xcb_flush(xcb_connection_t *c)
303 pthread_mutex_lock(&c->iolock);
304 ret = _xcb_out_flush_to(c, c->out.request);
305 pthread_mutex_unlock(&c->iolock);
309 /* Private interface */
311 int _xcb_out_init(_xcb_out *out)
313 if(pthread_cond_init(&out->socket_cond, 0))
315 out->return_socket = 0;
316 out->socket_closure = 0;
317 out->socket_moving = 0;
319 if(pthread_cond_init(&out->cond, 0))
326 out->request_written = 0;
328 if(pthread_mutex_init(&out->reqlenlock, 0))
330 out->maximum_request_length_tag = LAZY_NONE;
335 void _xcb_out_destroy(_xcb_out *out)
337 pthread_cond_destroy(&out->cond);
338 pthread_mutex_destroy(&out->reqlenlock);
341 int _xcb_out_send(xcb_connection_t *c, struct iovec *vector, int count)
345 ret = _xcb_conn_wait(c, &c->out.cond, &vector, &count);
346 c->out.request_written = c->out.request;
347 pthread_cond_broadcast(&c->out.cond);
348 _xcb_in_wake_up_next_reader(c);
352 void _xcb_out_send_sync(xcb_connection_t *c)
354 /* wait for other writing threads to get out of my way. */
355 while(c->out.writing)
356 pthread_cond_wait(&c->out.cond, &c->iolock);
361 int _xcb_out_flush_to(xcb_connection_t *c, uint64_t request)
363 assert(XCB_SEQUENCE_COMPARE(request, <=, c->out.request));
364 if(XCB_SEQUENCE_COMPARE(c->out.request_written, >=, request))
369 vec.iov_base = c->out.queue;
370 vec.iov_len = c->out.queue_len;
371 c->out.queue_len = 0;
372 return _xcb_out_send(c, &vec, 1);
374 while(c->out.writing)
375 pthread_cond_wait(&c->out.cond, &c->iolock);
376 assert(XCB_SEQUENCE_COMPARE(c->out.request_written, >=, request));