102 lines
3.4 KiB
C
102 lines
3.4 KiB
C
/* Copyright (C) 2001-2008 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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/* XID allocators. */
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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 "xcb.h"
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#include "xcbext.h"
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#include "xcbint.h"
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#include "xc_misc.h"
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/* Public interface */
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uint32_t xcb_generate_id(xcb_connection_t *c)
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{
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uint32_t ret;
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if(c->has_error)
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return -1;
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pthread_mutex_lock(&c->xid.lock);
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if(c->xid.last >= c->xid.max - c->xid.inc + 1)
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{
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xcb_xc_misc_get_xid_range_reply_t *range;
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assert(c->xid.last == c->xid.max);
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if (c->xid.last == 0) {
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/* finish setting up initial range */
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c->xid.max = c->setup->resource_id_mask;
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} else {
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/* check for extension */
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const xcb_query_extension_reply_t *xc_misc_reply =
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xcb_get_extension_data(c, &xcb_xc_misc_id);
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if (!xc_misc_reply) {
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pthread_mutex_unlock(&c->xid.lock);
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return -1;
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}
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/* get new range */
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range = xcb_xc_misc_get_xid_range_reply(c,
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xcb_xc_misc_get_xid_range(c), 0);
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/* XXX The latter disjunct is what the server returns
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when it is out of XIDs. Sweet. */
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if(!range || (range->start_id == 0 && range->count == 1))
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{
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pthread_mutex_unlock(&c->xid.lock);
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return -1;
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}
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assert(range->count > 0 && range->start_id > 0);
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c->xid.last = range->start_id;
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c->xid.max = range->start_id + (range->count - 1) * c->xid.inc;
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free(range);
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}
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} else {
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c->xid.last += c->xid.inc;
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}
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ret = c->xid.last | c->xid.base;
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pthread_mutex_unlock(&c->xid.lock);
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return ret;
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}
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/* Private interface */
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int _xcb_xid_init(xcb_connection_t *c)
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{
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if(pthread_mutex_init(&c->xid.lock, 0))
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return 0;
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c->xid.last = 0;
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c->xid.max = 0;
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c->xid.base = c->setup->resource_id_base;
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c->xid.inc = c->setup->resource_id_mask & -(c->setup->resource_id_mask);
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return 1;
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}
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void _xcb_xid_destroy(xcb_connection_t *c)
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{
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pthread_mutex_destroy(&c->xid.lock);
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}
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