/* 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) { pthread_mutex_destroy(&c->xid.lock); }