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/*
(c) Copyright 2001-2011 The world wide DirectFB Open Source Community (directfb.org)
(c) Copyright 2000-2004 Convergence (integrated media) GmbH
All rights reserved.
Written by Denis Oliver Kropp <dok@directfb.org>,
Andreas Hundt <andi@fischlustig.de>,
Sven Neumann <neo@directfb.org>,
Ville Syrjälä <syrjala@sci.fi> and
Claudio Ciccani <klan@users.sf.net>.
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 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
//#define DIRECT_ENABLE_DEBUG
#include <config.h>
extern "C" {
#include <direct/debug.h>
#include <direct/list.h>
#include <direct/mem.h>
#include <direct/messages.h>
#include <direct/thread.h>
#include <direct/util.h>
#include <voodoo/link.h>
#include <voodoo/message.h>
}
#include <voodoo/dispatcher.h>
#include <voodoo/manager.h>
#include <voodoo/packet.h>
D_DEBUG_DOMAIN( Voodoo_Dispatcher, "Voodoo/Dispatcher", "Voodoo Dispatcher" );
/**********************************************************************************************************************/
VoodooDispatcher::VoodooDispatcher( VoodooManager *manager )
:
magic(0),
manager(manager),
packets(NULL)
{
D_DEBUG_AT( Voodoo_Dispatcher, "VoodooDispatcher::%s( %p )\n", __func__, this );
/* Initialize lock. */
direct_mutex_init( &lock );
/* Initialize wait queue. */
direct_waitqueue_init( &queue );
D_MAGIC_SET( this, VoodooDispatcher );
dispatch_loop = direct_thread_create( DTT_MESSAGING, DispatchLoopMain, this, "Voodoo Dispatch" );
}
VoodooDispatcher::~VoodooDispatcher()
{
D_DEBUG_AT( Voodoo_Dispatcher, "VoodooDispatcher::%s( %p )\n", __func__, this );
D_MAGIC_ASSERT( this, VoodooDispatcher );
/* Acquire lock and wake up waiters. */
direct_mutex_lock( &lock );
direct_waitqueue_broadcast( &queue );
direct_mutex_unlock( &lock );
/* Wait for dispatcher loop exiting. */
direct_thread_join( dispatch_loop );
direct_thread_destroy( dispatch_loop );
/* Destroy queue. */
direct_waitqueue_deinit( &queue );
/* Destroy lock. */
direct_mutex_deinit( &lock );
D_MAGIC_CLEAR( this );
}
bool
VoodooDispatcher::Ready()
{
D_DEBUG_AT( Voodoo_Dispatcher, "VoodooDispatcher::%s( %p )\n", __func__, this );
D_MAGIC_ASSERT( this, VoodooDispatcher );
direct_mutex_lock( &lock );
bool ready = direct_list_count_elements_EXPENSIVE( packets ) < 3;
direct_mutex_unlock( &lock );
return ready;
}
void
VoodooDispatcher::PutPacket( VoodooPacket *packet )
{
D_DEBUG_AT( Voodoo_Dispatcher, "VoodooDispatcher::%s( %p, packet %p )\n", __func__, this, packet );
D_MAGIC_ASSERT( this, VoodooDispatcher );
direct_mutex_lock( &lock );
direct_list_append( &packets, &packet->link );
direct_waitqueue_broadcast( &queue );
direct_mutex_unlock( &lock );
}
void
VoodooDispatcher::ProcessMessages( VoodooMessageHeader *first,
size_t total_length )
{
D_DEBUG_AT( Voodoo_Dispatcher, "VoodooDispatcher::%s( %p, first %p, total_length "_ZU" )\n",
__func__, this, first, total_length );
D_MAGIC_ASSERT( this, VoodooDispatcher );
VoodooMessageHeader *header = first;
size_t offset = 0;
size_t aligned;
while (offset < total_length) {
/* Get the message header. */
header = (VoodooMessageHeader *)((char*) first + offset);
aligned = VOODOO_MSG_ALIGN( header->size );
D_DEBUG_AT( Voodoo_Dispatcher, " -> Next message has %d ("_ZU") bytes and is of type %d... (offset "_ZU"/"_ZU")\n",
header->size, aligned, header->type, offset, total_length );
D_ASSERT( header->size >= (int) sizeof(VoodooMessageHeader) );
D_ASSERT( header->size <= MAX_MSG_SIZE );
D_ASSERT( offset + aligned <= total_length );
switch (header->type) {
case VMSG_SUPER:
manager->handle_super( (VoodooSuperMessage*) header );
break;
case VMSG_REQUEST:
manager->handle_request( (VoodooRequestMessage*) header );
break;
case VMSG_RESPONSE:
manager->handle_response( (VoodooResponseMessage*) header );
break;
default:
D_BUG( "invalid message type %d", header->type );
break;
}
offset += aligned;
}
D_ASSERT( offset == total_length );
}
/**********************************************************************************************************************/
void *
VoodooDispatcher::DispatchLoop()
{
D_DEBUG_AT( Voodoo_Dispatcher, "VoodooDispatcher::%s( %p )\n", __func__, this );
direct_mutex_lock( &lock );
while (!manager->is_quit) {
VoodooPacket *packet;
D_MAGIC_ASSERT( this, VoodooDispatcher );
if (packets) {
packet = (VoodooPacket*) packets;
direct_list_remove( &packets, &packet->link );
manager->link->WakeUp( manager->link );
}
else {
direct_waitqueue_wait( &queue, &lock );
continue;
}
direct_mutex_unlock( &lock );
ProcessMessages( (VoodooMessageHeader*) packet->data_start(), packet->size() );
D_FREE( packet );
direct_mutex_lock( &lock );
}
direct_mutex_unlock( &lock );
return NULL;
}
void *
VoodooDispatcher::DispatchLoopMain( DirectThread *thread, void *arg )
{
D_DEBUG_AT( Voodoo_Dispatcher, "VoodooDispatcher::%s( %p, thread %p )\n", __func__, arg, thread );
VoodooDispatcher *dispatcher = (VoodooDispatcher*) arg;
return dispatcher->DispatchLoop();
}
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