guile/libguile/bdw-gc.h

#ifndef SCM_BDW_GC_H
#define SCM_BDW_GC_H

/* Copyright (C) 2006, 2008, 2009, 2011 Free Software Foundation, Inc.
 *
 * 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 3 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 Street, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

/* Correct header inclusion.  */

#include "libguile/scmconfig.h"

#ifdef SCM_USE_PTHREAD_THREADS

/* When pthreads are used, let `libgc' know about it and redirect allocation
   calls such as `GC_MALLOC ()' to (contention-free, faster) thread-local
   allocation.  */

# define GC_THREADS 1
# define GC_REDIRECT_TO_LOCAL 1

/* Don't #define pthread routines to their GC_pthread counterparts.
   Instead we will be careful inside Guile to use the GC_pthread
   routines.  */
# define GC_NO_THREAD_REDIRECTS 1

#endif

#include <gc/gc.h>

#if (! ((defined GC_VERSION_MAJOR) && (GC_VERSION_MAJOR >= 7)))
/* This was needed with `libgc' 6.x.  */
# include <gc/gc_local_alloc.h>
#endif

#if (defined GC_VERSION_MAJOR) && (GC_VERSION_MAJOR >= 7)
/* This type was provided by `libgc' 6.x.  */
typedef void *GC_PTR;
#endif


/* Return true if PTR points to the heap.  */
#define SCM_I_IS_POINTER_TO_THE_HEAP(ptr)	\
  (GC_base (ptr) != NULL)

/* Register a disappearing link for the object pointed to by OBJ such that
   the pointer pointed to be LINK is cleared when OBJ is reclaimed.  Do so
   only if OBJ actually points to the heap.  See
   http://thread.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/2563
   for details.  */
#define SCM_I_REGISTER_DISAPPEARING_LINK(link, obj)		\
  ((SCM_I_IS_POINTER_TO_THE_HEAP (obj))				\
   ? GC_GENERAL_REGISTER_DISAPPEARING_LINK ((link), (obj))	\
   : 0)


#endif /* SCM_BDW_GC_H */