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/*
* Copyright (c) 2002-2013 Balabit
* Copyright (c) 1998-2013 Balázs Scheidler
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "mainloop-call.h"
#include "tls-support.h"
#include <iv.h>
#include <iv_list.h>
#include <iv_event.h>
/************************************************************************************
* Cross-thread function calls into the main loop
************************************************************************************/
typedef struct _MainLoopTaskCallSite MainLoopTaskCallSite;
struct _MainLoopTaskCallSite
{
struct iv_list_head list;
MainLoopTaskFunc func;
gpointer user_data;
gpointer result;
gboolean pending;
gboolean wait;
gboolean mainfree;
GCond cond;
GMutex lock;
};
TLS_BLOCK_START
{
MainLoopTaskCallSite *call_info;
}
TLS_BLOCK_END;
#define call_info __tls_deref(call_info)
static GMutex main_task_lock;
static struct iv_list_head main_task_queue = IV_LIST_HEAD_INIT(main_task_queue);
static struct iv_event main_task_posted;
static void
main_loop_call_free(MainLoopTaskCallSite *site)
{
g_cond_clear(&site->cond);
g_mutex_clear(&site->lock);
g_free(site);
}
static void
main_loop_wait_for_pending_call_to_finish(void)
{
g_mutex_lock(&main_task_lock);
/* check if a previous call is being executed */
g_mutex_lock(&call_info->lock);
if (call_info->pending)
{
/* yes, it is still running, indicate that we need to be woken up */
call_info->wait = TRUE;
g_mutex_unlock(&call_info->lock);
while (call_info->pending)
g_cond_wait(&call_info->cond, &main_task_lock);
}
else
{
g_mutex_unlock(&call_info->lock);
}
g_mutex_unlock(&main_task_lock);
}
gpointer
main_loop_call(MainLoopTaskFunc func, gpointer user_data, gboolean wait)
{
if (main_loop_is_main_thread())
return func(user_data);
main_loop_wait_for_pending_call_to_finish();
/* call_info->lock is no longer needed, since we're the only ones using call_info now */
INIT_IV_LIST_HEAD(&call_info->list);
call_info->pending = TRUE;
call_info->func = func;
call_info->user_data = user_data;
call_info->wait = wait;
g_mutex_lock(&main_task_lock);
iv_list_add(&call_info->list, &main_task_queue);
iv_event_post(&main_task_posted);
if (wait)
{
while (call_info->pending)
g_cond_wait(&call_info->cond, &main_task_lock);
}
g_mutex_unlock(&main_task_lock);
return call_info->result;
}
static void
main_loop_call_handler(gpointer user_data)
{
gboolean dofree, dowakeup;
g_mutex_lock(&main_task_lock);
while (!iv_list_empty(&main_task_queue))
{
MainLoopTaskCallSite *site;
gpointer result;
site = iv_list_entry(main_task_queue.next, MainLoopTaskCallSite, list);
iv_list_del_init(&site->list);
g_mutex_unlock(&main_task_lock);
result = site->func(site->user_data);
g_mutex_lock(&site->lock);
site->result = result;
site->pending = FALSE;
dowakeup = site->wait;
dofree = site->mainfree;
g_mutex_unlock(&site->lock);
g_mutex_lock(&main_task_lock);
if (dofree)
main_loop_call_free(site);
else if (dowakeup)
g_cond_signal(&site->cond);
}
g_mutex_unlock(&main_task_lock);
}
void
main_loop_call_thread_init(void)
{
call_info = g_new0(MainLoopTaskCallSite, 1);
g_cond_init(&call_info->cond);
g_mutex_init(&call_info->lock);
}
void
main_loop_call_thread_deinit(void)
{
MainLoopTaskCallSite *site = call_info;
g_mutex_lock(&site->lock);
if (site->pending)
{
site->mainfree = TRUE;
call_info = NULL;
}
g_mutex_unlock(&site->lock);
if (call_info)
main_loop_call_free(call_info);
}
void
main_loop_call_init(void)
{
IV_EVENT_INIT(&main_task_posted);
main_task_posted.cookie = NULL;
main_task_posted.handler = main_loop_call_handler;
iv_event_register(&main_task_posted);
}
void
main_loop_call_deinit(void)
{
iv_event_unregister(&main_task_posted);
}
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