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/*
(c) Copyright 2001-2009 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.
*/
#ifndef __FUSION__LOCK_H__
#define __FUSION__LOCK_H__
#include <pthread.h>
#include <fusion/types.h>
#include <direct/messages.h>
#include <direct/util.h>
typedef union {
/* multi app */
struct {
int id;
const FusionWorldShared *shared;
/* builtin impl */
struct {
unsigned int locked;
pid_t owner;
DirectLink *waiting;
bool requested;
bool destroyed;
} builtin;
} multi;
/* single app */
struct {
pthread_mutex_t lock;
pthread_cond_t cond;
int count;
} single;
} FusionSkirmish;
/*
* Initialize.
*/
DirectResult fusion_skirmish_init ( FusionSkirmish *skirmish,
const char *name,
const FusionWorld *world );
/*
* Lock.
*/
DirectResult fusion_skirmish_prevail( FusionSkirmish *skirmish );
/*
* Try lock.
*/
DirectResult fusion_skirmish_swoop ( FusionSkirmish *skirmish );
/*
* Find out how many times current thread has acquired lock.
*/
DirectResult fusion_skirmish_lock_count( FusionSkirmish *skirmish, int *lock_count );
/*
* Unlock.
*/
DirectResult fusion_skirmish_dismiss( FusionSkirmish *skirmish );
/*
* Deinitialize.
*/
DirectResult fusion_skirmish_destroy( FusionSkirmish *skirmish );
/*
* Wait & Notify.
*
* Must be locked!
*/
DirectResult fusion_skirmish_wait ( FusionSkirmish *skirmish,
unsigned int timeout );
DirectResult fusion_skirmish_notify ( FusionSkirmish *skirmish );
#if D_DEBUG_ENABLED
#define FUSION_SKIRMISH_ASSERT(skirmish) \
do { \
int lock_count; \
\
D_ASSERT( skirmish != NULL ); \
\
D_ASSERT( fusion_skirmish_lock_count( skirmish, &lock_count ) == DR_OK ); \
D_ASSERT( lock_count > 0 ); \
} while (0)
#else
#define FUSION_SKIRMISH_ASSERT(skirmish) \
do { \
} while (0)
#endif
#endif
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