131 lines
4.1 KiB
C
131 lines
4.1 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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/* A cache for QueryExtension results. */
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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 <stdlib.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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typedef struct lazyreply {
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enum lazy_reply_tag tag;
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union {
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xcb_query_extension_cookie_t cookie;
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xcb_query_extension_reply_t *reply;
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} value;
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} lazyreply;
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static lazyreply *get_index(xcb_connection_t *c, int idx)
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{
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if(idx > c->ext.extensions_size)
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{
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int new_size = idx << 1;
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lazyreply *new_extensions = realloc(c->ext.extensions, sizeof(lazyreply) * new_size);
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if(!new_extensions)
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return 0;
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memset(new_extensions + c->ext.extensions_size, 0, sizeof(lazyreply) * (new_size - c->ext.extensions_size));
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c->ext.extensions = new_extensions;
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c->ext.extensions_size = new_size;
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}
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return c->ext.extensions + idx - 1;
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}
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static lazyreply *get_lazyreply(xcb_connection_t *c, xcb_extension_t *ext)
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{
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static pthread_mutex_t global_lock = PTHREAD_MUTEX_INITIALIZER;
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static int next_global_id;
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lazyreply *data;
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pthread_mutex_lock(&global_lock);
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if(!ext->global_id)
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ext->global_id = ++next_global_id;
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pthread_mutex_unlock(&global_lock);
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data = get_index(c, ext->global_id);
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if(data && data->tag == LAZY_NONE)
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{
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/* cache miss: query the server */
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data->tag = LAZY_COOKIE;
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data->value.cookie = xcb_query_extension(c, strlen(ext->name), ext->name);
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}
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return data;
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}
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/* Public interface */
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/* Do not free the returned xcb_query_extension_reply_t - on return, it's aliased
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* from the cache. */
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const xcb_query_extension_reply_t *xcb_get_extension_data(xcb_connection_t *c, xcb_extension_t *ext)
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{
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lazyreply *data;
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if(c->has_error)
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return 0;
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pthread_mutex_lock(&c->ext.lock);
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data = get_lazyreply(c, ext);
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if(data && data->tag == LAZY_COOKIE)
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{
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data->tag = LAZY_FORCED;
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data->value.reply = xcb_query_extension_reply(c, data->value.cookie, 0);
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}
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pthread_mutex_unlock(&c->ext.lock);
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return data ? data->value.reply : 0;
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}
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void xcb_prefetch_extension_data(xcb_connection_t *c, xcb_extension_t *ext)
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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->ext.lock);
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get_lazyreply(c, ext);
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pthread_mutex_unlock(&c->ext.lock);
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}
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/* Private interface */
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int _xcb_ext_init(xcb_connection_t *c)
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{
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if(pthread_mutex_init(&c->ext.lock, 0))
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return 0;
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return 1;
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}
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void _xcb_ext_destroy(xcb_connection_t *c)
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{
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pthread_mutex_destroy(&c->ext.lock);
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while(c->ext.extensions_size-- > 0)
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if(c->ext.extensions[c->ext.extensions_size].tag == LAZY_FORCED)
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free(c->ext.extensions[c->ext.extensions_size].value.reply);
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free(c->ext.extensions);
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}
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