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/* Copyright (C) 2001-2008 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.
*/
/* XID allocators. */
#include <assert.h>
#include <stdlib.h>
#include "xcb.h"
#include "xcbext.h"
#include "xcbint.h"
#include "xc_misc.h"
/* Public interface */
uint32_t xcb_generate_id(xcb_connection_t *c)
{
uint32_t ret;
if(c->has_error)
return -1;
pthread_mutex_lock(&c->xid.lock);
if(c->xid.last >= c->xid.max - c->xid.inc + 1)
{
xcb_xc_misc_get_xid_range_reply_t *range;
assert(c->xid.last == c->xid.max);
if (c->xid.last == 0) {
/* finish setting up initial range */
c->xid.max = c->setup->resource_id_mask;
} else {
/* check for extension */
const xcb_query_extension_reply_t *xc_misc_reply =
xcb_get_extension_data(c, &xcb_xc_misc_id);
if (!xc_misc_reply) {
pthread_mutex_unlock(&c->xid.lock);
return -1;
}
/* get new range */
range = xcb_xc_misc_get_xid_range_reply(c,
xcb_xc_misc_get_xid_range(c), 0);
/* XXX The latter disjunct is what the server returns
when it is out of XIDs. Sweet. */
if(!range || (range->start_id == 0 && range->count == 1))
{
pthread_mutex_unlock(&c->xid.lock);
return -1;
}
assert(range->count > 0 && range->start_id > 0);
c->xid.last = range->start_id;
c->xid.max = range->start_id + (range->count - 1) * c->xid.inc;
free(range);
}
} else {
c->xid.last += c->xid.inc;
}
ret = c->xid.last | c->xid.base;
pthread_mutex_unlock(&c->xid.lock);
return ret;
}
/* Private interface */
int _xcb_xid_init(xcb_connection_t *c)
{
if(pthread_mutex_init(&c->xid.lock, 0))
return 0;
c->xid.last = 0;
c->xid.max = 0;
c->xid.base = c->setup->resource_id_base;
c->xid.inc = c->setup->resource_id_mask & -(c->setup->resource_id_mask);
return 1;
}
void _xcb_xid_destroy(xcb_connection_t *c)
{
if (!c->xid.lock)
return; /* mutex was not initialised yet */
pthread_mutex_destroy(&c->xid.lock);
}
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