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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "IOThread.hxx"
#include "thread/Mutex.hxx"
#include "thread/Cond.hxx"
#include "event/Loop.hxx"
#include <assert.h>
static struct {
Mutex mutex;
Cond cond;
EventLoop *loop;
GThread *thread;
} io;
void
io_thread_run(void)
{
assert(io_thread_inside());
assert(io.loop != NULL);
io.loop->Run();
}
static gpointer
io_thread_func(G_GNUC_UNUSED gpointer arg)
{
/* lock+unlock to synchronize with io_thread_start(), to be
sure that io.thread is set */
io.mutex.lock();
io.mutex.unlock();
io_thread_run();
return NULL;
}
void
io_thread_init(void)
{
assert(io.loop == NULL);
assert(io.thread == NULL);
io.loop = new EventLoop();
}
bool
io_thread_start(GError **error_r)
{
assert(io.loop != NULL);
assert(io.thread == NULL);
io.mutex.lock();
io.thread = g_thread_create(io_thread_func, NULL, true, error_r);
io.mutex.unlock();
if (io.thread == NULL)
return false;
return true;
}
void
io_thread_quit(void)
{
assert(io.loop != NULL);
io.loop->Break();
}
void
io_thread_deinit(void)
{
if (io.thread != NULL) {
io_thread_quit();
g_thread_join(io.thread);
}
delete io.loop;
}
EventLoop &
io_thread_get()
{
assert(io.loop != nullptr);
return *io.loop;
}
bool
io_thread_inside(void)
{
return io.thread != NULL && g_thread_self() == io.thread;
}
struct call_data {
GThreadFunc function;
gpointer data;
bool done;
gpointer result;
};
static gboolean
io_thread_call_func(gpointer _data)
{
struct call_data *data = (struct call_data *)_data;
gpointer result = data->function(data->data);
io.mutex.lock();
data->done = true;
data->result = result;
io.cond.broadcast();
io.mutex.unlock();
return false;
}
gpointer
io_thread_call(GThreadFunc function, gpointer _data)
{
assert(io.thread != NULL);
if (io_thread_inside())
/* we're already in the I/O thread - no
synchronization needed */
return function(_data);
struct call_data data = {
function,
_data,
false,
nullptr,
};
io.loop->AddIdle(io_thread_call_func, &data);
io.mutex.lock();
while (!data.done)
io.cond.wait(io.mutex);
io.mutex.unlock();
return data.result;
}
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