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/*
* Copyright (c) 2009-2012, Vsevolod Stakhov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR ''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 AUTHOR 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.
*/
#include "config.h"
#include "main.h"
#include "events.h"
#undef RSPAMD_EVENTS_DEBUG
static gboolean
rspamd_event_equal (gconstpointer a, gconstpointer b)
{
const struct rspamd_async_event *ev1 = a, *ev2 = b;
if (ev1->fin == ev2->fin) {
return ev1->user_data == ev2->user_data;
}
return FALSE;
}
static guint
rspamd_event_hash (gconstpointer a)
{
const struct rspamd_async_event *ev = a;
return GPOINTER_TO_UINT (ev->user_data);
}
#if ((GLIB_MAJOR_VERSION == 2) && (GLIB_MINOR_VERSION <= 30))
static void
event_mutex_free (gpointer data)
{
GMutex *mtx = data;
g_mutex_free (mtx);
}
static void
event_cond_free (gpointer data)
{
GCond *cond = data;
g_cond_free (cond);
}
#endif
struct rspamd_async_session *
new_async_session (memory_pool_t * pool, session_finalizer_t fin,
event_finalizer_t restore, event_finalizer_t cleanup, void *user_data)
{
struct rspamd_async_session *new;
new = memory_pool_alloc (pool, sizeof (struct rspamd_async_session));
new->pool = pool;
new->fin = fin;
new->restore = restore;
new->cleanup = cleanup;
new->user_data = user_data;
new->wanna_die = FALSE;
new->events = g_hash_table_new (rspamd_event_hash, rspamd_event_equal);
#if ((GLIB_MAJOR_VERSION == 2) && (GLIB_MINOR_VERSION <= 30))
new->mtx = g_mutex_new ();
new->cond = g_cond_new ();
memory_pool_add_destructor (pool, (pool_destruct_func) event_mutex_free, new->mtx);
memory_pool_add_destructor (pool, (pool_destruct_func) event_cond_free, new->cond);
#else
new->mtx = memory_pool_alloc (pool, sizeof (GMutex));
g_mutex_init (new->mtx);
new->cond = memory_pool_alloc (pool, sizeof (GCond));
g_cond_init (new->cond);
memory_pool_add_destructor (pool, (pool_destruct_func) g_mutex_clear, new->mtx);
memory_pool_add_destructor (pool, (pool_destruct_func) g_cond_clear, new->cond);
#endif
new->threads = 0;
memory_pool_add_destructor (pool, (pool_destruct_func) g_hash_table_destroy, new->events);
return new;
}
void
register_async_event (struct rspamd_async_session *session, event_finalizer_t fin, void *user_data, GQuark subsystem)
{
struct rspamd_async_event *new;
if (session == NULL) {
msg_info ("session is NULL");
return;
}
g_mutex_lock (session->mtx);
new = memory_pool_alloc (session->pool, sizeof (struct rspamd_async_event));
new->fin = fin;
new->user_data = user_data;
new->subsystem = subsystem;
g_hash_table_insert (session->events, new, new);
#ifdef RSPAMD_EVENTS_DEBUG
msg_info ("added event: %p, pending %d events, subsystem: %s", user_data, g_hash_table_size (session->events),
g_quark_to_string (subsystem));
#endif
g_mutex_unlock (session->mtx);
}
void
remove_normal_event (struct rspamd_async_session *session, event_finalizer_t fin, void *ud)
{
struct rspamd_async_event search_ev, *found_ev;
if (session == NULL) {
msg_info ("session is NULL");
return;
}
g_mutex_lock (session->mtx);
/* Search for event */
search_ev.fin = fin;
search_ev.user_data = ud;
if ((found_ev = g_hash_table_lookup (session->events, &search_ev)) != NULL) {
g_hash_table_remove (session->events, found_ev);
#ifdef RSPAMD_EVENTS_DEBUG
msg_info ("removed event: %p, subsystem: %s, pending %d events", ud,
g_quark_to_string (found_ev->subsystem), g_hash_table_size (session->events));
#endif
/* Remove event */
fin (ud);
}
g_mutex_unlock (session->mtx);
check_session_pending (session);
}
static gboolean
rspamd_session_destroy (gpointer k, gpointer v, gpointer unused)
{
struct rspamd_async_event *ev = v;
/* Call event's finalizer */
if (ev->fin != NULL) {
ev->fin (ev->user_data);
}
return TRUE;
}
gboolean
destroy_session (struct rspamd_async_session *session)
{
if (session == NULL) {
msg_info ("session is NULL");
return FALSE;
}
g_mutex_lock (session->mtx);
if (session->threads > 0) {
/* Wait for conditional variable to finish processing */
g_mutex_unlock (session->mtx);
g_cond_wait (session->cond, session->mtx);
}
session->wanna_die = TRUE;
g_hash_table_foreach_remove (session->events, rspamd_session_destroy, session);
/* Mutex can be destroyed here */
g_mutex_unlock (session->mtx);
if (session->cleanup != NULL) {
session->cleanup (session->user_data);
}
return TRUE;
}
gboolean
check_session_pending (struct rspamd_async_session *session)
{
g_mutex_lock (session->mtx);
if (session->wanna_die && g_hash_table_size (session->events) == 0) {
session->wanna_die = FALSE;
if (session->threads > 0) {
/* Wait for conditional variable to finish processing */
g_cond_wait (session->cond, session->mtx);
}
if (session->fin != NULL) {
if (! session->fin (session->user_data)) {
g_mutex_unlock (session->mtx);
/* Session finished incompletely, perform restoration */
if (session->restore != NULL) {
session->restore (session->user_data);
/* Call pending once more */
return check_session_pending (session);
}
return TRUE;
}
}
g_mutex_unlock (session->mtx);
return FALSE;
}
g_mutex_unlock (session->mtx);
return TRUE;
}
/**
* Add new async thread to session
* @param session session object
*/
void
register_async_thread (struct rspamd_async_session *session)
{
g_atomic_int_inc (&session->threads);
#ifdef RSPAMD_EVENTS_DEBUG
msg_info ("added thread: pending %d thread", session->threads);
#endif
}
/**
* Remove async thread from session and check whether session can be terminated
* @param session session object
*/
void
remove_async_thread (struct rspamd_async_session *session)
{
if (g_atomic_int_dec_and_test (&session->threads)) {
/* Signal if there are any sessions waiting */
g_mutex_lock (session->mtx);
g_cond_signal (session->cond);
g_mutex_unlock (session->mtx);
}
#ifdef RSPAMD_EVENTS_DEBUG
msg_info ("removed thread: pending %d thread", session->threads);
#endif
}
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