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jeremybenn |
/*
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* Copyright (c) 2000 by Hewlett-Packard Company. All rights reserved.
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*
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* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
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* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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*
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* Permission is hereby granted to use or copy this program
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* for any purpose, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*/
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/*
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* Interface for thread local allocation. Memory obtained
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* this way can be used by all threads, as though it were obtained
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* from an allocator like GC_malloc. The difference is that GC_local_malloc
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* counts the number of allocations of a given size from the current thread,
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* and uses GC_malloc_many to perform the allocations once a threashold
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* is exceeded. Thus far less synchronization may be needed.
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* Allocation of known large objects should not use this interface.
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* This interface is designed primarily for fast allocation of small
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* objects on multiprocessors, e.g. for a JVM running on an MP server.
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*
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* If this file is included with GC_GCJ_SUPPORT defined, GCJ-style
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* bitmap allocation primitives will also be included.
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*
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* If this file is included with GC_REDIRECT_TO_LOCAL defined, then
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* GC_MALLOC, GC_MALLOC_ATOMIC, and possibly GC_GCJ_MALLOC will
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* be redefined to use the thread local allocatoor.
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*
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* The interface is available only if the collector is built with
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* -DTHREAD_LOCAL_ALLOC, which is currently supported only on Linux.
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*
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* The debugging allocators use standard, not thread-local allocation.
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*
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* These routines normally require an explicit call to GC_init(), though
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* that may be done from a constructor function.
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*/
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#ifndef GC_LOCAL_ALLOC_H
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#define GC_LOCAL_ALLOC_H
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#ifndef _GC_H
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# include "gc.h"
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#endif
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#if defined(GC_GCJ_SUPPORT) && !defined(GC_GCJ_H)
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# include "gc_gcj.h"
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#endif
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/* We assume ANSI C for this interface. */
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GC_PTR GC_local_malloc(size_t bytes);
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GC_PTR GC_local_malloc_atomic(size_t bytes);
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#if defined(GC_GCJ_SUPPORT)
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GC_PTR GC_local_gcj_malloc(size_t bytes,
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void * ptr_to_struct_containing_descr);
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#endif
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# ifdef GC_DEBUG
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/* We don't really use local allocation in this case. */
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# define GC_LOCAL_MALLOC(s) GC_debug_malloc(s,GC_EXTRAS)
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# define GC_LOCAL_MALLOC_ATOMIC(s) GC_debug_malloc_atomic(s,GC_EXTRAS)
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# ifdef GC_GCJ_SUPPORT
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# define GC_LOCAL_GCJ_MALLOC(s,d) GC_debug_gcj_malloc(s,d,GC_EXTRAS)
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# endif
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# else
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# define GC_LOCAL_MALLOC(s) GC_local_malloc(s)
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# define GC_LOCAL_MALLOC_ATOMIC(s) GC_local_malloc_atomic(s)
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# ifdef GC_GCJ_SUPPORT
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# define GC_LOCAL_GCJ_MALLOC(s,d) GC_local_gcj_malloc(s,d)
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# endif
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# endif
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# ifdef GC_REDIRECT_TO_LOCAL
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# undef GC_MALLOC
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# define GC_MALLOC(s) GC_LOCAL_MALLOC(s)
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# undef GC_MALLOC_ATOMIC
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# define GC_MALLOC_ATOMIC(s) GC_LOCAL_MALLOC_ATOMIC(s)
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# ifdef GC_GCJ_SUPPORT
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# undef GC_GCJ_MALLOC
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# define GC_GCJ_MALLOC(s,d) GC_LOCAL_GCJ_MALLOC(s,d)
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# endif
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# endif
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#endif /* GC_LOCAL_ALLOC_H */
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