libguile/boehm-gc.h

   1 #ifndef SCM_BOEHM_GC_H
   2 #define SCM_BOEHM_GC_H
   3
   4 /* Copyright (C) 2006, 2008, 2009 Free Software Foundation, Inc.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /* Correct header inclusion.  */
  22
  23 #include "libguile/gen-scmconfig.h"
  24
  25 #ifdef SCM_I_GSC_USE_PTHREAD_THREADS
  26
  27 /* When pthreads are used, let `libgc' know about it and redirect allocation
  28    calls such as `GC_MALLOC ()' to (contention-free, faster) thread-local
  29    allocation.  */
  30
  31 # define GC_THREADS 1
  32 # define GC_REDIRECT_TO_LOCAL 1
  33
  34 #endif
  35
  36 #include <gc/gc.h>
  37
  38 #if (! ((defined GC_VERSION_MAJOR) && (GC_VERSION_MAJOR >= 7)))
  39 /* This was needed with `libgc' 6.x.  */
  40 # include <gc/gc_local_alloc.h>
  41 #endif
  42
  43 #if (defined GC_VERSION_MAJOR) && (GC_VERSION_MAJOR >= 7)
  44 /* This type was provided by `libgc' 6.x.  */
  45 typedef void *GC_PTR;
  46 #endif
  47
  48
  49 #include <gc/gc_mark.h>
  50
  51 /* Return true if PTR points to the heap.  */
  52 #define SCM_I_IS_POINTER_TO_THE_HEAP(ptr)                       \
  53   ((void *) (ptr) >= GC_least_plausible_heap_addr               \
  54    && (void *) (ptr) <= GC_greatest_plausible_heap_addr)
  55
  56 /* Register a disappearing link for the object pointed to by OBJ such that
  57    the pointer pointed to be LINK is cleared when OBJ is reclaimed.  Do so
  58    only if OBJ actually points to the heap.  See
  59    http://thread.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/2563
  60    for details.  */
  61 #define SCM_I_REGISTER_DISAPPEARING_LINK(link, obj)             \
  62   ((SCM_I_IS_POINTER_TO_THE_HEAP (obj))                         \
  63    ? GC_GENERAL_REGISTER_DISAPPEARING_LINK ((link), (obj))      \
  64    : 0)
  65
  66
  67 #endif /* SCM_BOEHM_GC_H */