boehm-gc/include/gc_local_alloc.h

   1 /*
   2  * Copyright (c) 2000 by Hewlett-Packard Company.  All rights reserved.
   3  *
   4  * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
   5  * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
   6  *
   7  * Permission is hereby granted to use or copy this program
   8  * for any purpose,  provided the above notices are retained on all copies.
   9  * Permission to modify the code and to distribute modified code is granted,
  10  * provided the above notices are retained, and a notice that the code was
  11  * modified is included with the above copyright notice.
  12  */
  13
  14 /*
  15  * Interface for thread local allocation.  Memory obtained
  16  * this way can be used by all threads, as though it were obtained
  17  * from an allocator like GC_malloc.  The difference is that GC_local_malloc
  18  * counts the number of allocations of a given size from the current thread,
  19  * and uses GC_malloc_many to perform the allocations once a threashold
  20  * is exceeded.  Thus far less synchronization may be needed.
  21  * Allocation of known large objects should not use this interface.
  22  * This interface is designed primarily for fast allocation of small
  23  * objects on multiprocessors, e.g. for a JVM running on an MP server.
  24  *
  25  * If this file is included with GC_GCJ_SUPPORT defined, GCJ-style
  26  * bitmap allocation primitives will also be included.
  27  *
  28  * If this file is included with GC_REDIRECT_TO_LOCAL defined, then
  29  * GC_MALLOC, GC_MALLOC_ATOMIC, and possibly GC_GCJ_MALLOC will
  30  * be redefined to use the thread local allocatoor.
  31  *
  32  * The interface is available only if the collector is built with
  33  * -DTHREAD_LOCAL_ALLOC, which is currently supported only on Linux.
  34  *
  35  * The debugging allocators use standard, not thread-local allocation.
  36  *
  37  * These routines normally require an explicit call to GC_init(), though
  38  * that may be done from a constructor function.
  39  */
  40
  41 #ifndef GC_LOCAL_ALLOC_H
  42 #define GC_LOCAL_ALLOC_H
  43
  44 #ifndef _GC_H
  45 #   include "gc.h"
  46 #endif
  47
  48 #if defined(GC_GCJ_SUPPORT) && !defined(GC_GCJ_H)
  49 #   include "gc_gcj.h"
  50 #endif
  51
  52 /* We assume ANSI C for this interface. */
  53
  54 GC_PTR GC_local_malloc(size_t bytes);
  55
  56 GC_PTR GC_local_malloc_atomic(size_t bytes);
  57
  58 #if defined(GC_GCJ_SUPPORT)
  59   GC_PTR GC_local_gcj_malloc(size_t bytes,
  60                              void * ptr_to_struct_containing_descr);
  61 #endif
  62
  63 # ifdef GC_DEBUG
  64     /* We don't really use local allocation in this case.       */
  65 #   define GC_LOCAL_MALLOC(s) GC_debug_malloc(s,GC_EXTRAS)
  66 #   define GC_LOCAL_MALLOC_ATOMIC(s) GC_debug_malloc_atomic(s,GC_EXTRAS)
  67 #   ifdef GC_GCJ_SUPPORT
  68 #       define GC_LOCAL_GCJ_MALLOC(s,d) GC_debug_gcj_malloc(s,d,GC_EXTRAS)
  69 #   endif
  70 # else
  71 #   define GC_LOCAL_MALLOC(s) GC_local_malloc(s)
  72 #   define GC_LOCAL_MALLOC_ATOMIC(s) GC_local_malloc_atomic(s)
  73 #   ifdef GC_GCJ_SUPPORT
  74 #       define GC_LOCAL_GCJ_MALLOC(s,d) GC_local_gcj_malloc(s,d)
  75 #   endif
  76 # endif
  77
  78 # ifdef GC_REDIRECT_TO_LOCAL
  79 #   undef GC_MALLOC
  80 #   define GC_MALLOC(s) GC_LOCAL_MALLOC(s)
  81 #   undef GC_MALLOC_ATOMIC
  82 #   define GC_MALLOC_ATOMIC(s) GC_LOCAL_MALLOC_ATOMIC(s)
  83 #   ifdef GC_GCJ_SUPPORT
  84 #       undef GC_GCJ_MALLOC
  85 #       define GC_GCJ_MALLOC(s,d) GC_LOCAL_GCJ_MALLOC(s,d)
  86 #   endif
  87 # endif
  88
  89 #endif /* GC_LOCAL_ALLOC_H */