libguile/bdw-gc.h

   1 #ifndef SCM_BDW_GC_H
   2 #define SCM_BDW_GC_H
   3
   4 /* Copyright (C) 2006, 2008, 2009, 2011, 2012, 2013 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 License
   8  * as published by the Free Software Foundation; either version 3 of
   9  * the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful, but
  12  * 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
  19  * 02110-1301 USA
  20  */
  21
  22 /* Correct header inclusion.  */
  23
  24 #include "libguile/scmconfig.h"
  25
  26 #if SCM_USE_PTHREAD_THREADS
  27
  28 /* When pthreads are used, let `libgc' know about it and redirect allocation
  29    calls such as `GC_MALLOC ()' to (contention-free, faster) thread-local
  30    allocation.  */
  31
  32 # define GC_THREADS 1
  33 # define GC_REDIRECT_TO_LOCAL 1
  34
  35 /* Don't #define pthread routines to their GC_pthread counterparts.
  36    Instead we will be careful inside Guile to use the GC_pthread
  37    routines.  */
  38 # define GC_NO_THREAD_REDIRECTS 1
  39
  40 #ifdef __MINGW32__
  41 /* Rely on pthreads-w32.  */
  42 #define GC_WIN32_PTHREADS
  43 #endif
  44
  45 #endif
  46
  47 #include <gc/gc.h>
  48
  49 #if (! ((defined GC_VERSION_MAJOR) && (GC_VERSION_MAJOR >= 7)))
  50 /* This was needed with `libgc' 6.x.  */
  51 # include <gc/gc_local_alloc.h>
  52 #endif
  53
  54 /* Return true if PTR points to the heap.  */
  55 #define SCM_I_IS_POINTER_TO_THE_HEAP(ptr)       \
  56   (GC_base (ptr) != NULL)
  57
  58 /* Register a disappearing link for the object pointed to by OBJ such that
  59    the pointer pointed to be LINK is cleared when OBJ is reclaimed.  Do so
  60    only if OBJ actually points to the heap.  See
  61    http://thread.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/2563
  62    for details.  */
  63 #define SCM_I_REGISTER_DISAPPEARING_LINK(link, obj)             \
  64   ((SCM_I_IS_POINTER_TO_THE_HEAP (obj))                         \
  65    ? GC_GENERAL_REGISTER_DISAPPEARING_LINK ((link), (obj))      \
  66    : 0)
  67
  68
  69 #endif /* SCM_BDW_GC_H */