144 lines
3.8 KiB
C
144 lines
3.8 KiB
C
/*
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* cache.c
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* package object cache
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*
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* Copyright (c) 2013 pkgconf authors (see AUTHORS).
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* This software is provided 'as is' and without any warranty, express or
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* implied. In no event shall the authors be liable for any damages arising
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* from the use of this software.
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*/
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#include <libpkgconf/stdinc.h>
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#include <libpkgconf/libpkgconf.h>
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/*
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* !doc
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*
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* libpkgconf `cache` module
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* =========================
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*
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* The libpkgconf `cache` module manages a package/module object cache, allowing it to
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* avoid loading duplicate copies of a package/module.
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*
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* A cache is tied to a specific pkgconf client object, so package objects should not
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* be shared across threads.
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*/
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/*
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* !doc
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*
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* .. c:function:: pkgconf_pkg_t *pkgconf_cache_lookup(const pkgconf_client_t *client, const char *id)
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*
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* Looks up a package in the cache given an `id` atom,
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* such as ``gtk+-3.0`` and returns the already loaded version
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* if present.
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*
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* :param pkgconf_client_t* client: The client object to access.
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* :param char* id: The package atom to look up in the client object's cache.
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* :return: A package object if present, else ``NULL``.
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* :rtype: pkgconf_pkg_t *
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*/
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pkgconf_pkg_t *
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pkgconf_cache_lookup(pkgconf_client_t *client, const char *id)
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{
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pkgconf_node_t *node;
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PKGCONF_FOREACH_LIST_ENTRY(client->pkg_cache.head, node)
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{
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pkgconf_pkg_t *pkg = node->data;
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if (!strcmp(pkg->id, id))
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{
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PKGCONF_TRACE(client, "found: %s @%p", id, pkg);
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return pkgconf_pkg_ref(client, pkg);
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}
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}
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PKGCONF_TRACE(client, "miss: %s", id);
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return NULL;
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}
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/*
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* !doc
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*
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* .. c:function:: void pkgconf_cache_add(pkgconf_client_t *client, pkgconf_pkg_t *pkg)
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*
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* Adds an entry for the package to the package cache.
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* The cache entry must be removed if the package is freed.
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*
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* :param pkgconf_client_t* client: The client object to modify.
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* :param pkgconf_pkg_t* pkg: The package object to add to the client object's cache.
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* :return: nothing
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*/
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void
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pkgconf_cache_add(pkgconf_client_t *client, pkgconf_pkg_t *pkg)
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{
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if (pkg == NULL)
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return;
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pkgconf_pkg_ref(client, pkg);
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pkgconf_node_insert(&pkg->cache_iter, pkg, &client->pkg_cache);
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PKGCONF_TRACE(client, "added @%p to cache", pkg);
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/* mark package as cached */
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pkg->flags |= PKGCONF_PKG_PROPF_CACHED;
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}
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/*
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* !doc
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*
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* .. c:function:: void pkgconf_cache_remove(pkgconf_client_t *client, pkgconf_pkg_t *pkg)
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*
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* Deletes a package from the client object's package cache.
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*
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* :param pkgconf_client_t* client: The client object to modify.
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* :param pkgconf_pkg_t* pkg: The package object to remove from the client object's cache.
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* :return: nothing
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*/
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void
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pkgconf_cache_remove(pkgconf_client_t *client, pkgconf_pkg_t *pkg)
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{
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if (pkg == NULL)
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return;
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if (!(pkg->flags & PKGCONF_PKG_PROPF_CACHED))
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return;
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PKGCONF_TRACE(client, "removed @%p from cache", pkg);
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pkgconf_node_delete(&pkg->cache_iter, &client->pkg_cache);
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}
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/*
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* !doc
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*
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* .. c:function:: void pkgconf_cache_free(pkgconf_client_t *client)
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*
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* Releases all resources related to a client object's package cache.
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* This function should only be called to clear a client object's package cache,
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* as it may release any package in the cache.
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*
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* :param pkgconf_client_t* client: The client object to modify.
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*/
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void
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pkgconf_cache_free(pkgconf_client_t *client)
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{
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pkgconf_node_t *iter, *iter2;
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PKGCONF_FOREACH_LIST_ENTRY_SAFE(client->pkg_cache.head, iter2, iter)
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{
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pkgconf_pkg_t *pkg = iter->data;
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pkgconf_pkg_free(client, pkg);
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}
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memset(&client->pkg_cache, 0, sizeof client->pkg_cache);
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PKGCONF_TRACE(client, "cleared package cache");
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}
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