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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;
GCond *cond;
GStaticMutex lock;
};
TLS_BLOCK_START
{
MainLoopTaskCallSite call_info;
}
TLS_BLOCK_END;
#define call_info __tls_deref(call_info)
static GStaticMutex main_task_lock = G_STATIC_MUTEX_INIT;
static struct iv_list_head main_task_queue = IV_LIST_HEAD_INIT(main_task_queue);
static struct iv_event main_task_posted;
gpointer
main_loop_call(MainLoopTaskFunc func, gpointer user_data, gboolean wait)
{
if (main_loop_is_main_thread())
return func(user_data);
g_static_mutex_lock(&main_task_lock);
/* check if a previous call is being executed */
g_static_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_static_mutex_unlock(&call_info.lock);
while (call_info.pending)
g_cond_wait(call_info.cond, g_static_mutex_get_mutex(&main_task_lock));
}
else
{
g_static_mutex_unlock(&call_info.lock);
}
/* 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;
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, g_static_mutex_get_mutex(&main_task_lock));
}
g_static_mutex_unlock(&main_task_lock);
return call_info.result;
}
static void
main_loop_call_handler(gpointer user_data)
{
g_static_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_static_mutex_unlock(&main_task_lock);
result = site->func(site->user_data);
g_static_mutex_lock(&site->lock);
site->result = result;
site->pending = FALSE;
g_static_mutex_unlock(&site->lock);
g_static_mutex_lock(&main_task_lock);
if (site->wait)
g_cond_signal(site->cond);
}
g_static_mutex_unlock(&main_task_lock);
}
void
main_loop_call_thread_init(void)
{
call_info.cond = g_cond_new();
}
void
main_loop_call_thread_deinit(void)
{
if (call_info.cond)
g_cond_free(call_info.cond);
}
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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