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. */
47 #include "extensions/bigreq.h"
49 static int force_sequence_wrap(XCBConnection *c)
52 if((c->out.request - c->in.request_read) > 65530)
54 pthread_mutex_unlock(&c->iolock);
56 pthread_mutex_lock(&c->iolock);
61 /* Public interface */
63 CARD32 XCBGetMaximumRequestLength(XCBConnection *c)
65 pthread_mutex_lock(&c->out.reqlenlock);
66 if(!c->out.maximum_request_length)
68 const XCBQueryExtensionRep *ext;
69 c->out.maximum_request_length = c->setup->maximum_request_length;
70 ext = XCBGetExtensionData(c, &XCBBigRequestsId);
71 if(ext && ext->present)
73 XCBBigRequestsEnableRep *r = XCBBigRequestsEnableReply(c, XCBBigRequestsEnable(c), 0);
74 c->out.maximum_request_length = r->maximum_request_length;
78 pthread_mutex_unlock(&c->out.reqlenlock);
79 return c->out.maximum_request_length;
82 int XCBSendRequest(XCBConnection *c, unsigned int *request, int flags, struct iovec *vector, const XCBProtocolRequest *req)
84 static const char pad[3];
90 enum workarounds workaround = WORKAROUND_NONE;
95 assert(req->count > 0);
103 ((req->count * 2 + 2) * sizeof(struct iovec));
105 if(!(flags & XCB_REQUEST_RAW))
109 /* set the major opcode, and the minor opcode for extensions */
112 const XCBQueryExtensionRep *extension = XCBGetExtensionData(c, req->ext);
113 /* TODO: better error handling here, please! */
114 assert(extension && extension->present);
115 ((CARD8 *) vector[0].iov_base)[0] = extension->major_opcode;
116 ((CARD8 *) vector[0].iov_base)[1] = req->opcode;
119 ((CARD8 *) vector[0].iov_base)[0] = req->opcode;
121 /* put together the length field, possibly using BIGREQUESTS */
122 for(i = 0; i < req->count; ++i)
123 longlen += (vector[i].iov_len + 3) >> 2;
125 if(longlen <= c->setup->maximum_request_length)
127 /* we don't need BIGREQUESTS. */
131 else if(longlen > XCBGetMaximumRequestLength(c))
132 return 0; /* server can't take this; maybe need BIGREQUESTS? */
134 /* set the length field. */
135 ((CARD16 *) vector[0].iov_base)[1] = shortlen;
138 padded[0].iov_base = prefix;
139 padded[0].iov_len = sizeof(prefix);
140 prefix[0] = ((CARD32 *) vector[0].iov_base)[0];
141 prefix[1] = ++longlen;
142 vector[0].iov_base = ((char *) vector[0].iov_base) + sizeof(CARD32);
143 vector[0].iov_len -= sizeof(CARD32);
147 flags &= ~XCB_REQUEST_RAW;
149 for(i = 0; i < req->count; ++i)
151 if(!vector[i].iov_len)
153 padded[padlen].iov_base = vector[i].iov_base;
154 padded[padlen++].iov_len = vector[i].iov_len;
155 if(!XCB_PAD(vector[i].iov_len))
157 padded[padlen].iov_base = (caddr_t) pad;
158 padded[padlen++].iov_len = XCB_PAD(vector[i].iov_len);
161 /* do we need to work around the X server bug described in glx.xml? */
162 if(req->ext && !req->isvoid && strcmp(req->ext->name, "GLX") &&
163 ((req->opcode == 17 && ((CARD32 *) vector[0].iov_base)[0] == 0x10004) ||
165 workaround = WORKAROUND_GLX_GET_FB_CONFIGS_BUG;
167 /* get a sequence number and arrange for delivery. */
168 pthread_mutex_lock(&c->iolock);
169 if(req->isvoid && !force_sequence_wrap(c))
171 pthread_mutex_unlock(&c->iolock);
178 /* wait for other writing threads to get out of my way. */
179 while(c->out.writing)
180 pthread_cond_wait(&c->out.cond, &c->iolock);
182 *request = ++c->out.request;
184 _xcb_in_expect_reply(c, *request, workaround, flags);
186 ret = _xcb_out_write_block(c, padded, padlen);
187 pthread_mutex_unlock(&c->iolock);
195 int XCBFlush(XCBConnection *c)
198 pthread_mutex_lock(&c->iolock);
199 ret = _xcb_out_flush(c);
200 pthread_mutex_unlock(&c->iolock);
204 /* Private interface */
206 int _xcb_out_init(_xcb_out *out)
208 if(pthread_cond_init(&out->cond, 0))
217 out->request_written = 0;
219 if(pthread_mutex_init(&out->reqlenlock, 0))
221 out->maximum_request_length = 0;
226 void _xcb_out_destroy(_xcb_out *out)
228 pthread_cond_destroy(&out->cond);
229 pthread_mutex_destroy(&out->reqlenlock);
232 /* precondition: there must be something for us to write. */
233 int _xcb_out_write(XCBConnection *c)
236 assert(!c->out.queue_len);
237 n = writev(c->fd, c->out.vec, c->out.vec_len);
238 if(n < 0 && errno == EAGAIN)
243 for(; c->out.vec_len; --c->out.vec_len, ++c->out.vec)
245 int cur = c->out.vec->iov_len;
248 c->out.vec->iov_len -= cur;
249 c->out.vec->iov_base = (char *) c->out.vec->iov_base + cur;
251 if(c->out.vec->iov_len)
260 int _xcb_out_write_block(XCBConnection *c, struct iovec *vector, size_t count)
262 assert(!c->out.vec && !c->out.vec_len);
263 while(count && c->out.queue_len + vector[0].iov_len < sizeof(c->out.queue))
265 memcpy(c->out.queue + c->out.queue_len, vector[0].iov_base, vector[0].iov_len);
266 c->out.queue_len += vector[0].iov_len;
272 memmove(vector + 1, vector, count++ * sizeof(struct iovec));
273 vector[0].iov_base = c->out.queue;
274 vector[0].iov_len = c->out.queue_len;
275 c->out.queue_len = 0;
277 c->out.vec_len = count;
279 return _xcb_out_flush(c);
282 int _xcb_out_flush(XCBConnection *c)
288 assert(!c->out.vec && !c->out.vec_len);
289 vec.iov_base = c->out.queue;
290 vec.iov_len = c->out.queue_len;
293 c->out.queue_len = 0;
295 while(ret && c->out.vec_len)
296 ret = _xcb_conn_wait(c, /*should_write*/ 1, &c->out.cond);
297 c->out.request_written = c->out.request;
298 pthread_cond_broadcast(&c->out.cond);