ReactOS 0.4.15-dev-5666-gc548b97
bufpool.h
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1/*
2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
3 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
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10 * Software is furnished to do so, subject to the following conditions:
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15 * shall be included in all copies or substantial portions of the Software.
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29 */
30
31/*
32 * bufpool.h
33 *
34 */
35
36#ifndef __glubufpool_h_
37#define __glubufpool_h_
38
39#include "gluos.h"
40#include "myassert.h"
41//#include "mystdlib.h"
42
43#define NBLOCKS 32
44
45class Buffer {
46 friend class Pool;
47 Buffer * next; /* next buffer on free list */
48};
49
50class Pool {
51public:
52 Pool( int, int, const char * );
53 ~Pool( void );
54 inline void* new_buffer( void );
55 inline void free_buffer( void * );
56 void clear( void );
57
58private:
59 void grow( void );
60
61protected:
62 Buffer *freelist; /* linked list of free buffers */
63 char *blocklist[NBLOCKS]; /* blocks of malloced memory */
64 int nextblock; /* next free block index */
65 char *curblock; /* last malloced block */
66 int buffersize; /* bytes per buffer */
67 int nextsize; /* size of next block of memory */
68 int nextfree; /* byte offset past next free buffer */
70 enum Magic { is_allocated = 0xf3a1, is_free = 0xf1a2 };
71 const char *name; /* name of the pool */
72 Magic magic; /* marker for valid pool */
73};
74
75/*-----------------------------------------------------------------------------
76 * Pool::free_buffer - return a buffer to a pool
77 *-----------------------------------------------------------------------------
78 */
79
80inline void
82{
83 assert( (this != 0) && (magic == is_allocated) );
84
85 /* add buffer to singly connected free list */
86
87 ((Buffer *) b)->next = freelist;
88 freelist = (Buffer *) b;
89}
90
91
92/*-----------------------------------------------------------------------------
93 * Pool::new_buffer - allocate a buffer from a pool
94 *-----------------------------------------------------------------------------
95 */
96
97inline void *
99{
100 void *buffer;
101
102 assert( (this != 0) && (magic == is_allocated) );
103
104 /* find free buffer */
105
106 if( freelist ) {
107 buffer = (void *) freelist;
109 } else {
110 if( ! nextfree )
111 grow( );
113 buffer = (void *) (curblock + nextfree);
114 }
115 return buffer;
116}
117
119public:
120 inline void * operator new( size_t, Pool & );
121 inline void * operator new( size_t, void *);
122 inline void * operator new( size_t s)
123 { return ::new char[s]; }
124 inline void operator delete( void * ) { assert( 0 ); }
125 inline void operator delete( void *, Pool & ) { assert( 0 ); }
126 inline void deleteMe( Pool & );
127};
128
129inline void *
130PooledObj::operator new( size_t, Pool& pool )
131{
132 return pool.new_buffer();
133}
134
135inline void
137{
138 pool.free_buffer( (void *) this );
139}
140
141#endif /* __glubufpool_h_ */
#define NBLOCKS
Definition: bufpool.h:43
Definition: bufpool.h:45
Buffer * next
Definition: bufpool.h:47
Definition: bufpool.h:50
void clear(void)
Definition: bufpool.cc:100
const char * name
Definition: bufpool.h:71
int nextfree
Definition: bufpool.h:68
void free_buffer(void *)
Definition: bufpool.h:81
Magic
Definition: bufpool.h:70
@ is_allocated
Definition: bufpool.h:70
@ is_free
Definition: bufpool.h:70
void grow(void)
Definition: bufpool.cc:85
void * new_buffer(void)
Definition: bufpool.h:98
char * blocklist[NBLOCKS]
Definition: bufpool.h:63
int initsize
Definition: bufpool.h:69
Buffer * freelist
Definition: bufpool.h:62
~Pool(void)
Definition: bufpool.cc:73
int buffersize
Definition: bufpool.h:66
Magic magic
Definition: bufpool.h:72
int nextsize
Definition: bufpool.h:67
char * curblock
Definition: bufpool.h:65
int nextblock
Definition: bufpool.h:64
void deleteMe(Pool &)
Definition: bufpool.h:136
#define assert(x)
Definition: debug.h:53
__kernel_size_t size_t
Definition: linux.h:237
GLdouble s
Definition: gl.h:2039
GLuint buffer
Definition: glext.h:5915
GLboolean GLboolean GLboolean b
Definition: glext.h:6204