2475
|
1 /* |
|
2 |
2847
|
3 Copyright (C) 1996, 1997 John W. Eaton |
2475
|
4 |
|
5 This file is part of Octave. |
|
6 |
|
7 Octave is free software; you can redistribute it and/or modify it |
|
8 under the terms of the GNU General Public License as published by the |
7016
|
9 Free Software Foundation; either version 3 of the License, or (at your |
|
10 option) any later version. |
2475
|
11 |
|
12 Octave is distributed in the hope that it will be useful, but WITHOUT |
|
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
15 for more details. |
|
16 |
|
17 You should have received a copy of the GNU General Public License |
7016
|
18 along with Octave; see the file COPYING. If not, see |
|
19 <http://www.gnu.org/licenses/>. |
2475
|
20 |
|
21 */ |
|
22 |
|
23 #if !defined (octave_oct_alloc_h) |
|
24 #define octave_oct_alloc_h 1 |
|
25 |
|
26 class |
6108
|
27 OCTAVE_API |
2475
|
28 octave_allocator |
|
29 { |
|
30 public: |
|
31 |
|
32 octave_allocator (size_t item_sz, int grow_sz = 256) |
|
33 : head (0), grow_size (grow_sz), |
|
34 item_size (item_sz > sizeof (link *) ? item_sz : sizeof (link *)) |
|
35 { } |
|
36 |
|
37 // Get an object from the free list, possibly increasing the size of |
|
38 // the free list. |
|
39 void *alloc (size_t size); |
|
40 |
|
41 // Put objects back on the free list. |
|
42 void free (void *p, size_t size); |
|
43 |
|
44 private: |
|
45 |
|
46 // Structure for internal free list management. |
|
47 struct link { link *next; }; |
|
48 |
|
49 // Front of the free list. |
|
50 link *head; |
|
51 |
|
52 // How many objects to get each time we call the global operator new. |
|
53 int grow_size; |
|
54 |
|
55 // The size of each item on the list (or, if that is smaller than |
|
56 // the size of list*, the size of list*. |
|
57 size_t item_size; |
|
58 |
|
59 // How to grow the free list. |
|
60 bool grow (void); |
|
61 }; |
|
62 |
4352
|
63 #if defined (HAVE_PLACEMENT_DELETE) |
|
64 #define DECLARE_OCTAVE_ALLOCATOR_PLACEMENT_DELETE \ |
|
65 void operator delete (void *p, void *) \ |
|
66 { ::operator delete (p, static_cast<void*> (0)); } |
|
67 #else |
|
68 #define DECLARE_OCTAVE_ALLOCATOR_PLACEMENT_DELETE \ |
|
69 void operator delete (void *p, void *) \ |
|
70 { ::operator delete (p); } |
|
71 #endif |
|
72 |
3219
|
73 #define DECLARE_OCTAVE_ALLOCATOR \ |
|
74 public: \ |
4219
|
75 void *operator new (size_t size, void *p) \ |
|
76 { return ::operator new (size, p); } \ |
4352
|
77 DECLARE_OCTAVE_ALLOCATOR_PLACEMENT_DELETE \ |
3219
|
78 void *operator new (size_t size) { return allocator.alloc (size); } \ |
|
79 void operator delete (void *p, size_t size) { allocator.free (p, size); } \ |
|
80 private: \ |
|
81 static octave_allocator allocator; |
|
82 |
|
83 #define DEFINE_OCTAVE_ALLOCATOR(t) \ |
|
84 octave_allocator t::allocator (sizeof (t)) |
|
85 |
|
86 #define DEFINE_OCTAVE_ALLOCATOR2(t, s) \ |
|
87 octave_allocator t::allocator (sizeof (t), s) |
|
88 |
2475
|
89 #endif |
|
90 |
|
91 /* |
|
92 ;;; Local Variables: *** |
|
93 ;;; mode: C++ *** |
|
94 ;;; End: *** |
|
95 */ |