383 lines
12 KiB
C
383 lines
12 KiB
C
/* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the names of the authors or their
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* institutions shall not be used in advertising or otherwise to promote the
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* sale, use or other dealings in this Software without prior written
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* authorization from the authors.
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*/
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/* Stuff that sends stuff to the server. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <assert.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include "xcb.h"
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#include "xcbext.h"
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#include "xcbint.h"
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#include "bigreq.h"
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static inline void send_request(xcb_connection_t *c, int isvoid, enum workarounds workaround, int flags, struct iovec *vector, int count)
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{
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if(c->has_error)
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return;
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++c->out.request;
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if(!isvoid)
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c->in.request_expected = c->out.request;
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if(workaround != WORKAROUND_NONE || flags != 0)
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_xcb_in_expect_reply(c, c->out.request, workaround, flags);
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while(count && c->out.queue_len + vector[0].iov_len <= sizeof(c->out.queue))
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{
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memcpy(c->out.queue + c->out.queue_len, vector[0].iov_base, vector[0].iov_len);
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c->out.queue_len += vector[0].iov_len;
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vector[0].iov_base = (char *) vector[0].iov_base + vector[0].iov_len;
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vector[0].iov_len = 0;
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++vector, --count;
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}
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if(!count)
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return;
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--vector, ++count;
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vector[0].iov_base = c->out.queue;
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vector[0].iov_len = c->out.queue_len;
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c->out.queue_len = 0;
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_xcb_out_send(c, vector, count);
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}
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static void send_sync(xcb_connection_t *c)
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{
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static const union {
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struct {
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uint8_t major;
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uint8_t pad;
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uint16_t len;
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} fields;
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uint32_t packet;
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} sync_req = { { /* GetInputFocus */ 43, 0, 1 } };
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struct iovec vector[2];
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vector[1].iov_base = (char *) &sync_req;
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vector[1].iov_len = sizeof(sync_req);
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send_request(c, 0, WORKAROUND_NONE, XCB_REQUEST_DISCARD_REPLY, vector + 1, 1);
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}
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static void get_socket_back(xcb_connection_t *c)
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{
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while(c->out.return_socket && c->out.socket_moving)
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pthread_cond_wait(&c->out.socket_cond, &c->iolock);
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if(!c->out.return_socket)
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return;
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c->out.socket_moving = 1;
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pthread_mutex_unlock(&c->iolock);
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c->out.return_socket(c->out.socket_closure);
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pthread_mutex_lock(&c->iolock);
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c->out.socket_moving = 0;
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pthread_cond_broadcast(&c->out.socket_cond);
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c->out.return_socket = 0;
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c->out.socket_closure = 0;
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_xcb_in_replies_done(c);
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}
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/* Public interface */
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void xcb_prefetch_maximum_request_length(xcb_connection_t *c)
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{
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if(c->has_error)
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return;
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pthread_mutex_lock(&c->out.reqlenlock);
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if(c->out.maximum_request_length_tag == LAZY_NONE)
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{
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const xcb_query_extension_reply_t *ext;
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ext = xcb_get_extension_data(c, &xcb_big_requests_id);
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if(ext && ext->present)
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{
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c->out.maximum_request_length_tag = LAZY_COOKIE;
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c->out.maximum_request_length.cookie = xcb_big_requests_enable(c);
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}
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else
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{
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c->out.maximum_request_length_tag = LAZY_FORCED;
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c->out.maximum_request_length.value = c->setup->maximum_request_length;
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}
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}
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pthread_mutex_unlock(&c->out.reqlenlock);
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}
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uint32_t xcb_get_maximum_request_length(xcb_connection_t *c)
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{
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if(c->has_error)
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return 0;
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xcb_prefetch_maximum_request_length(c);
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pthread_mutex_lock(&c->out.reqlenlock);
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if(c->out.maximum_request_length_tag == LAZY_COOKIE)
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{
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xcb_big_requests_enable_reply_t *r = xcb_big_requests_enable_reply(c, c->out.maximum_request_length.cookie, 0);
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c->out.maximum_request_length_tag = LAZY_FORCED;
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if(r)
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{
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c->out.maximum_request_length.value = r->maximum_request_length;
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free(r);
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}
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else
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c->out.maximum_request_length.value = c->setup->maximum_request_length;
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}
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pthread_mutex_unlock(&c->out.reqlenlock);
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return c->out.maximum_request_length.value;
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}
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unsigned int xcb_send_request(xcb_connection_t *c, int flags, struct iovec *vector, const xcb_protocol_request_t *req)
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{
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uint64_t request;
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uint32_t prefix[2];
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int veclen = req->count;
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enum workarounds workaround = WORKAROUND_NONE;
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if(c->has_error)
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return 0;
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assert(c != 0);
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assert(vector != 0);
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assert(req->count > 0);
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if(!(flags & XCB_REQUEST_RAW))
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{
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static const char pad[3];
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unsigned int i;
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uint16_t shortlen = 0;
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size_t longlen = 0;
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assert(vector[0].iov_len >= 4);
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/* set the major opcode, and the minor opcode for extensions */
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if(req->ext)
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{
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const xcb_query_extension_reply_t *extension = xcb_get_extension_data(c, req->ext);
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if(!(extension && extension->present))
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{
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_xcb_conn_shutdown(c, XCB_CONN_CLOSED_EXT_NOTSUPPORTED);
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return 0;
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}
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((uint8_t *) vector[0].iov_base)[0] = extension->major_opcode;
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((uint8_t *) vector[0].iov_base)[1] = req->opcode;
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}
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else
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((uint8_t *) vector[0].iov_base)[0] = req->opcode;
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/* put together the length field, possibly using BIGREQUESTS */
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for(i = 0; i < req->count; ++i)
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{
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longlen += vector[i].iov_len;
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if(!vector[i].iov_base)
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{
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vector[i].iov_base = (char *) pad;
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assert(vector[i].iov_len <= sizeof(pad));
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}
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}
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assert((longlen & 3) == 0);
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longlen >>= 2;
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if(longlen <= c->setup->maximum_request_length)
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{
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/* we don't need BIGREQUESTS. */
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shortlen = longlen;
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longlen = 0;
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}
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else if(longlen > xcb_get_maximum_request_length(c))
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{
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_xcb_conn_shutdown(c, XCB_CONN_CLOSED_REQ_LEN_EXCEED);
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return 0; /* server can't take this; maybe need BIGREQUESTS? */
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}
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/* set the length field. */
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((uint16_t *) vector[0].iov_base)[1] = shortlen;
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if(!shortlen)
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{
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prefix[0] = ((uint32_t *) vector[0].iov_base)[0];
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prefix[1] = ++longlen;
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vector[0].iov_base = (uint32_t *) vector[0].iov_base + 1;
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vector[0].iov_len -= sizeof(uint32_t);
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--vector, ++veclen;
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vector[0].iov_base = prefix;
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vector[0].iov_len = sizeof(prefix);
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}
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}
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flags &= ~XCB_REQUEST_RAW;
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/* do we need to work around the X server bug described in glx.xml? */
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/* XXX: GetFBConfigs won't use BIG-REQUESTS in any sane
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* configuration, but that should be handled here anyway. */
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if(req->ext && !req->isvoid && !strcmp(req->ext->name, "GLX") &&
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((req->opcode == 17 && ((uint32_t *) vector[0].iov_base)[1] == 0x10004) ||
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req->opcode == 21))
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workaround = WORKAROUND_GLX_GET_FB_CONFIGS_BUG;
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/* get a sequence number and arrange for delivery. */
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pthread_mutex_lock(&c->iolock);
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/* wait for other writing threads to get out of my way. */
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while(c->out.writing)
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pthread_cond_wait(&c->out.cond, &c->iolock);
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get_socket_back(c);
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/* send GetInputFocus (sync_req) when 64k-2 requests have been sent without
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* a reply. */
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if(req->isvoid && c->out.request == c->in.request_expected + (1 << 16) - 2)
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send_sync(c);
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/* Also send sync_req (could use NoOp) at 32-bit wrap to avoid having
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* applications see sequence 0 as that is used to indicate
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* an error in sending the request */
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if((unsigned int) (c->out.request + 1) == 0)
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send_sync(c);
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/* The above send_sync calls could drop the I/O lock, but this
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* thread will still exclude any other thread that tries to write,
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* so the sequence number postconditions still hold. */
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send_request(c, req->isvoid, workaround, flags, vector, veclen);
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request = c->has_error ? 0 : c->out.request;
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pthread_mutex_unlock(&c->iolock);
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return request;
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}
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int xcb_take_socket(xcb_connection_t *c, void (*return_socket)(void *closure), void *closure, int flags, uint64_t *sent)
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{
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int ret;
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if(c->has_error)
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return 0;
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pthread_mutex_lock(&c->iolock);
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get_socket_back(c);
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/* _xcb_out_flush may drop the iolock allowing other threads to
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* write requests, so keep flushing until we're done
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*/
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do
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ret = _xcb_out_flush_to(c, c->out.request);
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while (ret && c->out.request != c->out.request_written);
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if(ret)
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{
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c->out.return_socket = return_socket;
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c->out.socket_closure = closure;
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if(flags)
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_xcb_in_expect_reply(c, c->out.request, WORKAROUND_EXTERNAL_SOCKET_OWNER, flags);
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assert(c->out.request == c->out.request_written);
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*sent = c->out.request;
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}
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pthread_mutex_unlock(&c->iolock);
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return ret;
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}
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int xcb_writev(xcb_connection_t *c, struct iovec *vector, int count, uint64_t requests)
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{
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int ret;
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if(c->has_error)
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return 0;
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pthread_mutex_lock(&c->iolock);
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c->out.request += requests;
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ret = _xcb_out_send(c, vector, count);
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pthread_mutex_unlock(&c->iolock);
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return ret;
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}
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int xcb_flush(xcb_connection_t *c)
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{
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int ret;
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if(c->has_error)
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return 0;
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pthread_mutex_lock(&c->iolock);
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ret = _xcb_out_flush_to(c, c->out.request);
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pthread_mutex_unlock(&c->iolock);
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return ret;
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}
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/* Private interface */
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int _xcb_out_init(_xcb_out *out)
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{
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if(pthread_cond_init(&out->socket_cond, 0))
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return 0;
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out->return_socket = 0;
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out->socket_closure = 0;
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out->socket_moving = 0;
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if(pthread_cond_init(&out->cond, 0))
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return 0;
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out->writing = 0;
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out->queue_len = 0;
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out->request = 0;
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out->request_written = 0;
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if(pthread_mutex_init(&out->reqlenlock, 0))
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return 0;
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out->maximum_request_length_tag = LAZY_NONE;
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return 1;
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}
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void _xcb_out_destroy(_xcb_out *out)
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{
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pthread_cond_destroy(&out->cond);
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pthread_mutex_destroy(&out->reqlenlock);
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}
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int _xcb_out_send(xcb_connection_t *c, struct iovec *vector, int count)
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{
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int ret = 1;
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while(ret && count)
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ret = _xcb_conn_wait(c, &c->out.cond, &vector, &count);
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c->out.request_written = c->out.request;
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pthread_cond_broadcast(&c->out.cond);
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_xcb_in_wake_up_next_reader(c);
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return ret;
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}
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void _xcb_out_send_sync(xcb_connection_t *c)
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{
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/* wait for other writing threads to get out of my way. */
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while(c->out.writing)
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pthread_cond_wait(&c->out.cond, &c->iolock);
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get_socket_back(c);
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send_sync(c);
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}
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int _xcb_out_flush_to(xcb_connection_t *c, uint64_t request)
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{
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assert(XCB_SEQUENCE_COMPARE(request, <=, c->out.request));
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if(XCB_SEQUENCE_COMPARE(c->out.request_written, >=, request))
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return 1;
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if(c->out.queue_len)
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{
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struct iovec vec;
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vec.iov_base = c->out.queue;
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vec.iov_len = c->out.queue_len;
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c->out.queue_len = 0;
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return _xcb_out_send(c, &vec, 1);
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}
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while(c->out.writing)
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pthread_cond_wait(&c->out.cond, &c->iolock);
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assert(XCB_SEQUENCE_COMPARE(c->out.request_written, >=, request));
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return 1;
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}
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