From: Florent Bruneau Date: Mon, 10 Nov 2008 17:11:51 +0000 (+0100) Subject: Add 'resource' keeper. X-Git-Url: http://git.madism.org/?a=commitdiff_plain;h=36f50414e9b2f1b76dcce6efde97ef7cc550456b;p=apps%2Fpfixtools.git Add 'resource' keeper. Signed-off-by: Florent Bruneau --- diff --git a/postlicyd/resources.c b/postlicyd/resources.c new file mode 100644 index 0000000..759c717 --- /dev/null +++ b/postlicyd/resources.c @@ -0,0 +1,141 @@ +/******************************************************************************/ +/* pfixtools: a collection of postfix related tools */ +/* ~~~~~~~~~ */ +/* ________________________________________________________________________ */ +/* */ +/* Redistribution and use in source and binary forms, with or without */ +/* modification, are permitted provided that the following conditions */ +/* are met: */ +/* */ +/* 1. Redistributions of source code must retain the above copyright */ +/* notice, this list of conditions and the following disclaimer. */ +/* 2. Redistributions in binary form must reproduce the above copyright */ +/* notice, this list of conditions and the following disclaimer in the */ +/* documentation and/or other materials provided with the distribution. */ +/* 3. The names of its contributors may not be used to endorse or promote */ +/* products derived from this software without specific prior written */ +/* permission. */ +/* */ +/* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND */ +/* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE */ +/* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */ +/* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS */ +/* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR */ +/* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF */ +/* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS */ +/* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */ +/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) */ +/* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF */ +/* THE POSSIBILITY OF SUCH DAMAGE. */ +/******************************************************************************/ + +/* + * Copyright © 2008 Florent Bruneau + */ + +#include "str.h" +#include "array.h" +#include "resources.h" + +typedef struct resource_t { + char *key; + void *data; + int refcount; + resource_destructor_t destructor; +} resource_t; +ARRAY(resource_t); + +#define RESOURCE_INIT { NULL, NULL, 0, NULL } + +static A(resource_t) resources = ARRAY_INIT; + +#define RESOURCE_KEY \ + char rskey[BUFSIZ]; \ + m_strcpy(rskey, BUFSIZ, ns); \ + m_strcat(rskey, BUFSIZ, "@@"); \ + m_strcat(rskey, BUFSIZ, key); + +static inline void resource_wipe(resource_t *res) +{ + static const resource_t vr = RESOURCE_INIT; + if (res->destructor) { + res->destructor(res->data); + } + p_delete(&res->key); + *res = vr; +} + +static inline resource_t *resource_find(const char *key, bool create) +{ + foreach (resource_t* res, resources) { + if (strcmp(res->key, key) == 0) { + return res; + } + }} + if (create) { + resource_t res = RESOURCE_INIT; + res.key = m_strdup(key); + array_add(resources, res); + return &array_last(resources); + } + return NULL; +} + +void *resource_get(const char *ns, const char *key) +{ + RESOURCE_KEY; + resource_t *entry = resource_find(rskey, false); + if (entry == NULL) { + return NULL; + } else { + ++entry->refcount; + return entry->data; + } +} + +bool resource_set(const char *ns, const char *key, void *data, + resource_destructor_t destructor) { + RESOURCE_KEY; + resource_t *entry = resource_find(rskey, true); + if (entry->data != NULL) { + if (entry->destructor) { + entry->destructor(entry->data); + } + } + entry->refcount += 1; + entry->data = data; + entry->destructor = destructor; + return true; +} + +void resource_release(const char *ns, const char *key) +{ + RESOURCE_KEY; + resource_t *entry = resource_find(rskey, false); + if (entry != NULL) { + assert(entry->refcount > 0); + --entry->refcount; + } +} + +void resource_garbage_collect(void) +{ + uint32_t used = 0; + foreach (resource_t *res, resources) { + if (res->key != NULL && res->refcount == 0) { + resource_wipe(res); + } else if (res->key != NULL) { + if (used < __Ai) { + array_elt(resources, used) = *res; + } + ++used; + } + }} + array_len(resources) = used; +} + +static void resources_exit(void) +{ + array_deep_wipe(resources, resource_wipe); +} +module_exit(resources_exit); diff --git a/postlicyd/resources.h b/postlicyd/resources.h new file mode 100644 index 0000000..973a608 --- /dev/null +++ b/postlicyd/resources.h @@ -0,0 +1,55 @@ +/******************************************************************************/ +/* pfixtools: a collection of postfix related tools */ +/* ~~~~~~~~~ */ +/* ________________________________________________________________________ */ +/* */ +/* Redistribution and use in source and binary forms, with or without */ +/* modification, are permitted provided that the following conditions */ +/* are met: */ +/* */ +/* 1. Redistributions of source code must retain the above copyright */ +/* notice, this list of conditions and the following disclaimer. */ +/* 2. Redistributions in binary form must reproduce the above copyright */ +/* notice, this list of conditions and the following disclaimer in the */ +/* documentation and/or other materials provided with the distribution. */ +/* 3. The names of its contributors may not be used to endorse or promote */ +/* products derived from this software without specific prior written */ +/* permission. */ +/* */ +/* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND */ +/* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE */ +/* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */ +/* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS */ +/* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR */ +/* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF */ +/* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS */ +/* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */ +/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) */ +/* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF */ +/* THE POSSIBILITY OF SUCH DAMAGE. */ +/******************************************************************************/ + +/* + * Copyright © 2008 Florent Bruneau + */ + +#ifndef PFIXTOOLS_RESOURCES_H +#define PFIXTOOLS_RESOURCES_H + +#include "common.h" + +typedef void (*resource_destructor_t)(void *); + +__attribute__((nonnull(2))) +void *resource_get(const char *ns, const char *key); + +__attribute__((nonnull(2,3))) +bool resource_set(const char *ns, const char *key, void *data, + resource_destructor_t destructor); + +__attribute__((nonnull(1))) +void resource_release(const char *ns, const char *key); + +void resource_garbage_collect(void); + +#endif