2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
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36 #ifndef __glubufpool_h_
37 #define __glubufpool_h_
47 Buffer
* next
; /* next buffer on free list */
52 Pool( int, int, const char * );
54 inline void* new_buffer( void );
55 inline void free_buffer( void * );
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 */
75 /*-----------------------------------------------------------------------------
76 * Pool::free_buffer - return a buffer to a pool
77 *-----------------------------------------------------------------------------
81 Pool::free_buffer( void *b
)
83 assert( (this != 0) && (magic
== is_allocated
) );
85 /* add buffer to singly connected free list */
87 ((Buffer
*) b
)->next
= freelist
;
88 freelist
= (Buffer
*) b
;
92 /*-----------------------------------------------------------------------------
93 * Pool::new_buffer - allocate a buffer from a pool
94 *-----------------------------------------------------------------------------
98 Pool::new_buffer( void )
102 assert( (this != 0) && (magic
== is_allocated
) );
104 /* find free buffer */
107 buffer
= (void *) freelist
;
108 freelist
= freelist
->next
;
112 nextfree
-= buffersize
;;
113 buffer
= (void *) (curblock
+ nextfree
);
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
& );
130 PooledObj::operator new( size_t, Pool
& pool
)
132 return pool
.new_buffer();
136 PooledObj::deleteMe( Pool
& pool
)
138 pool
.free_buffer( (void *) this );
141 #endif /* __glubufpool_h_ */