ReactOS  0.4.12-dev-919-gfc3b8d5
bufpool.h
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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 
45 class Buffer {
46  friend class Pool;
47  Buffer * next; /* next buffer on free list */
48 };
49 
50 class Pool {
51 public:
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 
58 private:
59  void grow( void );
60 
61 protected:
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 */
69  int initsize;
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 
80 inline 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 
97 inline 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( );
112  nextfree -= buffersize;;
113  buffer = (void *) (curblock + nextfree);
114  }
115  return buffer;
116 }
117 
118 class PooledObj {
119 public:
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 
129 inline void *
131 {
132  return pool.new_buffer();
133 }
134 
135 inline void
137 {
138  pool.free_buffer( (void *) this );
139 }
140 
141 #endif /* __glubufpool_h_ */
void grow(void)
Definition: bufpool.cc:85
Buffer * next
Definition: bufpool.h:47
#define new(TYPE, numElems)
Definition: treelist.c:54
void * new_buffer(void)
Definition: bufpool.h:98
int initsize
Definition: bufpool.h:69
int buffersize
Definition: bufpool.h:66
operator
#define assert(x)
Definition: debug.h:53
GLuint buffer
Definition: glext.h:5915
#define NBLOCKS
Definition: bufpool.h:43
char * blocklist[NBLOCKS]
Definition: bufpool.h:63
char * curblock
Definition: bufpool.h:65
Buffer * freelist
Definition: bufpool.h:62
void deleteMe(Pool &)
Definition: bufpool.h:136
Definition: bufpool.h:45
Pool(int, int, const char *)
Definition: bufpool.cc:49
Magic
Definition: bufpool.h:70
__kernel_size_t size_t
Definition: linux.h:237
GLboolean GLboolean GLboolean b
Definition: glext.h:6204
const char * name
Definition: bufpool.h:71
Definition: bufpool.h:50
Magic magic
Definition: bufpool.h:72
void clear(void)
Definition: bufpool.cc:100
GLdouble s
Definition: gl.h:2039
~Pool(void)
Definition: bufpool.cc:73
int nextsize
Definition: bufpool.h:67
int nextblock
Definition: bufpool.h:64
void free_buffer(void *)
Definition: bufpool.h:81
int nextfree
Definition: bufpool.h:68