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