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/*
* Copyright (C) 2003-2011 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 "io_thread.h"
#include <assert.h>
static struct {
GMutex *mutex;
GCond *cond;
GMainContext *context;
GMainLoop *loop;
GThread *thread;
} io;
void
io_thread_run(void)
{
assert(io_thread_inside());
assert(io.context != NULL);
assert(io.loop != NULL);
g_main_loop_run(io.loop);
}
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 */
g_mutex_lock(io.mutex);
g_mutex_unlock(io.mutex);
io_thread_run();
return NULL;
}
void
io_thread_init(void)
{
assert(io.context == NULL);
assert(io.loop == NULL);
assert(io.thread == NULL);
io.mutex = g_mutex_new();
io.cond = g_cond_new();
io.context = g_main_context_new();
io.loop = g_main_loop_new(io.context, false);
}
bool
io_thread_start(GError **error_r)
{
assert(io.context != NULL);
assert(io.loop != NULL);
assert(io.thread == NULL);
g_mutex_lock(io.mutex);
io.thread = g_thread_create(io_thread_func, NULL, true, error_r);
g_mutex_unlock(io.mutex);
if (io.thread == NULL)
return false;
return true;
}
void
io_thread_quit(void)
{
assert(io.loop != NULL);
g_main_loop_quit(io.loop);
}
void
io_thread_deinit(void)
{
if (io.thread != NULL) {
io_thread_quit();
g_thread_join(io.thread);
}
if (io.loop != NULL)
g_main_loop_unref(io.loop);
if (io.context != NULL)
g_main_context_unref(io.context);
g_cond_free(io.cond);
g_mutex_free(io.mutex);
}
GMainContext *
io_thread_context(void)
{
return io.context;
}
bool
io_thread_inside(void)
{
return io.thread != NULL && g_thread_self() == io.thread;
}
guint
io_thread_idle_add(GSourceFunc function, gpointer data)
{
GSource *source = g_idle_source_new();
g_source_set_callback(source, function, data, NULL);
guint id = g_source_attach(source, io.context);
g_source_unref(source);
return id;
}
GSource *
io_thread_timeout_add(guint interval_ms, GSourceFunc function, gpointer data)
{
GSource *source = g_timeout_source_new(interval_ms);
g_source_set_callback(source, function, data, NULL);
g_source_attach(source, io.context);
return source;
}
GSource *
io_thread_timeout_add_seconds(guint interval,
GSourceFunc function, gpointer data)
{
GSource *source = g_timeout_source_new_seconds(interval);
g_source_set_callback(source, function, data, NULL);
g_source_attach(source, io.context);
return source;
}
struct call_data {
GThreadFunc function;
gpointer data;
bool done;
gpointer result;
};
static gboolean
io_thread_call_func(gpointer _data)
{
struct call_data *data = _data;
gpointer result = data->function(data->data);
g_mutex_lock(io.mutex);
data->done = true;
data->result = result;
g_cond_broadcast(io.cond);
g_mutex_unlock(io.mutex);
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 = function,
.data = _data,
.done = false,
};
io_thread_idle_add(io_thread_call_func, &data);
g_mutex_lock(io.mutex);
while (!data.done)
g_cond_wait(io.cond, io.mutex);
g_mutex_unlock(io.mutex);
return data.result;
}
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