ngx_int_t
ngx_shmtx_create(ngx_shmtx_t *mtx, ngx_shmtx_sh_t *addr, u_char *name)
{
if (mtx->name) {
if (ngx_strcmp(name, mtx->name) == 0) {
mtx->name = name;
return NGX_OK;
}
ngx_shmtx_destroy(mtx);
}
mtx->fd = ngx_open_file(name, NGX_FILE_RDWR, NGX_FILE_CREATE_OR_OPEN,
NGX_FILE_DEFAULT_ACCESS);
if (mtx->fd == NGX_INVALID_FILE) {
ngx_log_error(NGX_LOG_EMERG, ngx_cycle->log, ngx_errno,
ngx_open_file_n " \"%s\" failed", name);
return NGX_ERROR;
}
if (ngx_delete_file(name) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno,
ngx_delete_file_n " \"%s\" failed", name);
}
mtx->name = name;
return NGX_OK;
}
static ngx_int_t
__ngx_http_session_delete(ngx_http_session_t *session)
{
ngx_int_t ret;
ngx_http_session_list_t *session_list;
session_list = ngx_http_session_shm_zone->data;
if (!session->ref) {
if (!session->next && !session->prev) {
/* the only node in the chain */
*(session->slot) = NULL;
} else if (!session->prev && session->next) {
/* first node in the chain */
*(session->slot) = session->next;
((ngx_http_session_t *)(session->next))->prev = NULL;
((ngx_http_session_t *)(session->next))->slot = session->slot;
} else if (session->next && session->prev) {
/* node in the middle */
((ngx_http_session_t *)(session->prev))->next = session->next;
((ngx_http_session_t *)(session->next))->prev = session->prev;
} else if (session->prev && !session->next) {
/* last node in the chain */
((ngx_http_session_t *)(session->prev))->next = NULL;
}
session->next = session->prev = NULL;
if (session->ev.timer_set) {
ngx_del_timer(&session->ev);
}
if (!ngx_queue_empty(&session->redirect_queue_node)) {
ngx_queue_remove(&session->redirect_queue_node);
session_list->redirect_num--;
}
__ngx_http_session_ctx_delete(session);
ngx_shmtx_destroy(&session->mutex);
ngx_slab_free_locked(session_list->shpool, session);
ret = NGX_OK;
} else {
ret = NGX_ERROR;
}
return ret;
}