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Annotation of OpenXM_contrib2/asir2000/gc/include/gc_local_alloc.h, Revision 1.3

1.1       noro        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.
1.3     ! noro       36:  *
        !            37:  * These routines normally require an explicit call to GC_init(), though
        !            38:  * that may be done from a constructor function.
1.1       noro       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: #   define GC_LOCAL_MALLOC(s) GC_debug_malloc(s,GC_EXTRAS)
                     65: #   define GC_LOCAL_MALLOC_ATOMIC(s) GC_debug_malloc_atomic(s,GC_EXTRAS)
                     66: #   ifdef GC_GCJ_SUPPORT
                     67: #      define GC_LOCAL_GCJ_MALLOC(s,d) GC_debug_gcj_malloc(s,d,GC_EXTRAS)
                     68: #   endif
                     69: # else
                     70: #   define GC_LOCAL_MALLOC(s) GC_local_malloc(s)
                     71: #   define GC_LOCAL_MALLOC_ATOMIC(s) GC_local_malloc_atomic(s)
                     72: #   ifdef GC_GCJ_SUPPORT
                     73: #      define GC_LOCAL_GCJ_MALLOC(s,d) GC_local_gcj_malloc(s,d)
                     74: #   endif
                     75: # endif
                     76:
                     77: # ifdef GC_REDIRECT_TO_LOCAL
                     78: #   undef GC_MALLOC
                     79: #   define GC_MALLOC(s) GC_LOCAL_MALLOC(s)
                     80: #   undef GC_MALLOC_ATOMIC
                     81: #   define GC_MALLOC_ATOMIC(s) GC_LOCAL_MALLOC_ATOMIC(s)
                     82: #   ifdef GC_GCJ_SUPPORT
                     83: #      undef GC_GCJ_MALLOC
                     84: #      define GC_GCJ_MALLOC(s,d) GC_LOCAL_GCJ_MALLOC(s,d)
                     85: #   endif
                     86: # endif
                     87:
                     88: #endif /* GC_LOCAL_ALLOC_H */