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_ */