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libxcb/src/xcb_out.c

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/* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the names of the authors or their
* institutions shall not be used in advertising or otherwise to promote the
* sale, use or other dealings in this Software without prior written
* authorization from the authors.
*/
/* Stuff that sends stuff to the server. */
#include <assert.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#ifndef __GNUC__
# if HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef _AIX
#pragma alloca
# endif
# endif
#endif
#include "xcb.h"
#include "xcbext.h"
#include "xcbint.h"
#include "extensions/bigreq.h"
static int force_sequence_wrap(XCBConnection *c)
{
int ret = 1;
if((c->out.request - c->in.request_read) > 65530)
{
pthread_mutex_unlock(&c->iolock);
ret = XCBSync(c, 0);
pthread_mutex_lock(&c->iolock);
}
return ret;
}
/* Public interface */
CARD32 XCBGetMaximumRequestLength(XCBConnection *c)
{
pthread_mutex_lock(&c->out.reqlenlock);
if(!c->out.maximum_request_length)
{
const XCBQueryExtensionRep *ext;
c->out.maximum_request_length = c->setup->maximum_request_length;
ext = XCBGetExtensionData(c, &XCBBigRequestsId);
if(ext && ext->present)
{
XCBBigRequestsEnableRep *r = XCBBigRequestsEnableReply(c, XCBBigRequestsEnable(c), 0);
c->out.maximum_request_length = r->maximum_request_length;
free(r);
}
}
pthread_mutex_unlock(&c->out.reqlenlock);
return c->out.maximum_request_length;
}
int XCBSendRequest(XCBConnection *c, unsigned int *request, struct iovec *vector, const XCBProtocolRequest *req)
{
static const char pad[3];
int ret;
int i;
struct iovec *padded;
int padlen = 0;
CARD16 shortlen = 0;
CARD32 longlen = 0;
enum workarounds workaround = WORKAROUND_NONE;
assert(c != 0);
assert(request != 0);
assert(vector != 0);
assert(req->count > 0);
/* set the major opcode, and the minor opcode for extensions */
if(req->ext)
{
const XCBQueryExtensionRep *extension = XCBGetExtensionData(c, req->ext);
/* TODO: better error handling here, please! */
assert(extension && extension->present);
((CARD8 *) vector[0].iov_base)[0] = extension->major_opcode;
((CARD8 *) vector[0].iov_base)[1] = req->opcode;
/* do we need to work around the X server bug described in glx.xml? */
if(strcmp(req->ext->name, "GLX") &&
((req->opcode == 17 && ((CARD32 *) vector[0].iov_base)[0] == 0x10004) ||
req->opcode == 21))
workaround = WORKAROUND_GLX_GET_FB_CONFIGS_BUG;
}
else
((CARD8 *) vector[0].iov_base)[0] = req->opcode;
/* put together the length field, possibly using BIGREQUESTS */
for(i = 0; i < req->count; ++i)
longlen += (vector[i].iov_len + 3) >> 2;
if(longlen <= c->setup->maximum_request_length)
{
/* we don't need BIGREQUESTS. */
shortlen = longlen;
longlen = 0;
}
else if(longlen > XCBGetMaximumRequestLength(c))
return 0; /* server can't take this; maybe need BIGREQUESTS? */
padded =
#ifdef HAVE_ALLOCA
alloca
#else
malloc
#endif
((req->count * 2 + 3) * sizeof(struct iovec));
/* set the length field. */
((CARD16 *) vector[0].iov_base)[1] = shortlen;
if(!shortlen)
{
padded[0].iov_base = vector[0].iov_base;
padded[0].iov_len = sizeof(CARD32);
vector[0].iov_base = ((char *) vector[0].iov_base) + sizeof(CARD32);
vector[0].iov_len -= sizeof(CARD32);
++longlen;
padded[1].iov_base = &longlen;
padded[1].iov_len = sizeof(CARD32);
padlen = 2;
}
for(i = 0; i < req->count; ++i)
{
if(!vector[i].iov_len)
continue;
padded[padlen].iov_base = vector[i].iov_base;
padded[padlen++].iov_len = vector[i].iov_len;
if(!XCB_PAD(vector[i].iov_len))
continue;
padded[padlen].iov_base = (caddr_t) pad;
padded[padlen++].iov_len = XCB_PAD(vector[i].iov_len);
}
/* get a sequence number and arrange for delivery. */
pthread_mutex_lock(&c->iolock);
if(req->isvoid && !force_sequence_wrap(c))
{
pthread_mutex_unlock(&c->iolock);
#ifndef HAVE_ALLOCA
free(padded);
#endif
return -1;
}
*request = ++c->out.request;
if(!req->isvoid)
_xcb_in_expect_reply(c, *request, workaround);
ret = _xcb_out_write_block(c, padded, padlen);
pthread_mutex_unlock(&c->iolock);
#ifndef HAVE_ALLOCA
free(padded);
#endif
return ret;
}
int XCBFlush(XCBConnection *c)
{
int ret;
pthread_mutex_lock(&c->iolock);
ret = _xcb_out_flush(c);
pthread_mutex_unlock(&c->iolock);
return ret;
}
/* Private interface */
int _xcb_out_init(_xcb_out *out)
{
if(pthread_cond_init(&out->cond, 0))
return 0;
out->writing = 0;
out->queue_len = 0;
out->vec = 0;
out->vec_len = 0;
out->request = 0;
out->request_written = 0;
if(pthread_mutex_init(&out->reqlenlock, 0))
return 0;
out->maximum_request_length = 0;
return 1;
}
void _xcb_out_destroy(_xcb_out *out)
{
pthread_cond_destroy(&out->cond);
pthread_mutex_destroy(&out->reqlenlock);
}
/* precondition: there must be something for us to write. */
int _xcb_out_write(XCBConnection *c)
{
int n;
assert(!c->out.queue_len);
n = writev(c->fd, c->out.vec, c->out.vec_len);
if(n < 0 && errno == EAGAIN)
return 1;
if(n <= 0)
return 0;
for(; c->out.vec_len; --c->out.vec_len, ++c->out.vec)
{
int cur = c->out.vec->iov_len;
if(cur > n)
cur = n;
c->out.vec->iov_len -= cur;
c->out.vec->iov_base = (char *) c->out.vec->iov_base + cur;
n -= cur;
if(c->out.vec->iov_len)
break;
}
if(!c->out.vec_len)
c->out.vec = 0;
assert(n == 0);
return 1;
}
int _xcb_out_write_block(XCBConnection *c, struct iovec *vector, size_t count)
{
while(c->out.writing)
pthread_cond_wait(&c->out.cond, &c->iolock);
assert(!c->out.vec && !c->out.vec_len);
while(count && c->out.queue_len + vector[0].iov_len < sizeof(c->out.queue))
{
memcpy(c->out.queue + c->out.queue_len, vector[0].iov_base, vector[0].iov_len);
c->out.queue_len += vector[0].iov_len;
++vector, --count;
}
if(!count)
return 1;
memmove(vector + 1, vector, count++ * sizeof(struct iovec));
vector[0].iov_base = c->out.queue;
vector[0].iov_len = c->out.queue_len;
c->out.queue_len = 0;
c->out.vec_len = count;
c->out.vec = vector;
return _xcb_out_flush(c);
}
int _xcb_out_flush(XCBConnection *c)
{
int ret = 1;
struct iovec vec;
if(c->out.queue_len)
{
assert(!c->out.vec && !c->out.vec_len);
vec.iov_base = c->out.queue;
vec.iov_len = c->out.queue_len;
c->out.vec = &vec;
c->out.vec_len = 1;
c->out.queue_len = 0;
}
while(ret && c->out.vec_len)
ret = _xcb_conn_wait(c, /*should_write*/ 1, &c->out.cond);
c->out.request_written = c->out.request;
pthread_cond_broadcast(&c->out.cond);
return ret;
}
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