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#include <ngx_core.h>
#define NGX_POOL_CTX_SIZE 1024
typedef struct ngx_pool_context_node_s ngx_pool_context_node_t;
struct ngx_pool_context_node_s
{
ngx_pool_context_node_t *next;
ngx_pool_context_node_t **prev;
ngx_pool_t *pool;
ngx_uint_t index;
void *data;
};
static void
ngx_pool_context_cleanup(void *data);
typedef struct {
ngx_uint_t size;
} ngx_pool_context_conf_t;
static void * ngx_pool_context_create_conf(ngx_cycle_t *cycle);
static char * ngx_pool_context_init_conf(ngx_cycle_t *cycle, void *conf);
static ngx_core_module_t ngx_pool_context_module_ctx = {
ngx_string("pool_context"),
ngx_pool_context_create_conf,
ngx_pool_context_init_conf,
};
static ngx_command_t ngx_pool_context_commands[] = {
{ ngx_string("pool_context_hash_size"),
NGX_MAIN_CONF|NGX_DIRECT_CONF|NGX_CONF_TAKE1,
ngx_conf_set_num_slot,
0,
offsetof(ngx_pool_context_conf_t, size),
NULL
},
ngx_null_command
};
ngx_module_t ngx_pool_context_module = {
NGX_MODULE_V1,
&ngx_pool_context_module_ctx, /* module context */
ngx_pool_context_commands, /* module directives */
NGX_CORE_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
#define ngx_pool_context_hash_key(r, ctx_index) ((ngx_uint_t) r + ctx_index)
#define ngx_pool_context_unlink(node) \
\
*(node->prev) = node->next; \
\
if (node->next) { \
node->next->prev = node->prev; \
} \
\
node->prev = NULL; \
#define ngx_pool_context_link(queue, node) \
\
if (node->prev != NULL) { \
ngx_pool_context_unlink(node); \
} \
node->next = (ngx_pool_context_node_t *) *queue; \
node->prev = (ngx_pool_context_node_t **) queue; \
*queue = node; \
\
if (node->next) { \
node->next->prev = &node->next; \
}
static ngx_pool_context_node_t **ngx_pool_context_hash;
static ngx_uint_t ngx_pool_context_hash_size;
/* Nginx has removed multi-thread support, so we do not need mutex */
void *
ngx_pool_get_ctx(ngx_pool_t *pool, ngx_uint_t index)
{
ngx_uint_t hash;
uint32_t key;
ngx_pool_context_node_t *node;
hash = (ngx_uint_t) pool + index;
key = ngx_murmur_hash2((u_char *)&hash, sizeof(hash)) % ngx_pool_context_hash_size;
node = ngx_pool_context_hash[key];
while (node) {
if (node->pool == pool && node->index == index) {
return node->data;
}
node = node->next;
}
return NULL;
}
ngx_int_t
ngx_pool_set_ctx(ngx_pool_t *pool, ngx_uint_t index, void *data)
{
ngx_uint_t hash;
uint32_t key;
ngx_pool_context_node_t *node;
ngx_pool_cleanup_t *cln;
hash = (ngx_uint_t) pool + index;
key = ngx_murmur_hash2((u_char *)&hash, sizeof(hash)) % ngx_pool_context_hash_size;
node = ngx_pool_context_hash[key];
while (node) {
if (node->pool == pool
&& node->index == index) {
node->data = data;
return NGX_OK;
}
node = node->next;
}
cln = ngx_pool_cleanup_add(pool, sizeof(ngx_pool_context_node_t));
if (cln == NULL) {
return NGX_ERROR;
}
cln->handler = ngx_pool_context_cleanup;
node = cln->data;
node->prev = NULL;
node->next = NULL;
node->pool = pool;
node->index = index;
node->data = data;
ngx_pool_context_link(&ngx_pool_context_hash[key], node);
return NGX_OK;
}
static void
ngx_pool_context_cleanup(void *data)
{
ngx_pool_context_node_t *node = data;
ngx_pool_context_unlink(node);
}
static void *
ngx_pool_context_create_conf(ngx_cycle_t *cycle)
{
ngx_pool_context_conf_t *pcf;
/* create config */
pcf = ngx_pcalloc(cycle->pool, sizeof(ngx_pool_context_conf_t));
if (pcf == NULL) {
return NULL;
}
pcf->size = NGX_CONF_UNSET_UINT;
return pcf;
}
static char *
ngx_pool_context_init_conf(ngx_cycle_t *cycle, void *conf)
{
ngx_pool_context_conf_t *pcf = conf;
ngx_conf_init_uint_value(pcf->size, cycle->connection_n);
ngx_pool_context_hash_size = pcf->size;
ngx_pool_context_hash = ngx_pcalloc(cycle->pool, sizeof(ngx_pool_context_node_t *) * ngx_pool_context_hash_size);
if (ngx_pool_context_hash == NULL) {
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}
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