2 * Copyright (c) 1995-1997, Index Data.
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.4 1997-09-29 07:12:50 adam
8 * NMEM thread safe. NMEM must be initialized before use (sigh) -
9 * routine nmem_init/nmem_exit implemented.
11 * Revision 1.3 1997/07/21 12:47:38 adam
12 * Moved definition of nmem_control and nmem_block.
14 * Revision 1.2 1995/12/13 13:44:37 quinn
15 * Modified Data1-system to use nmem
17 * Revision 1.1 1995/11/13 09:27:52 quinn
18 * Fiddling with the variant stuff.
24 * This is a simple and fairly wasteful little module for nibble memory
25 * allocation. Evemtually we'll put in something better.
34 #define NMEM_CHUNK (10*1024)
37 static CRITICAL_SECTION critical_section;
38 #define NMEM_ENTER EnterCriticalSection(&critical_section)
39 #define NMEM_LEAVE LeaveCriticalSection(&critical_section)
45 static nmem_block *freelist = NULL; /* "global" freelists */
46 static nmem_control *cfreelist = NULL;
48 static void free_block(nmem_block *p)
55 * acquire a block with a minimum of size free bytes.
57 static nmem_block *get_block(int size)
61 for (r = freelist, l = 0; r; l = r, r = r->next)
75 r = xmalloc(sizeof(*r));
76 r->buf = xmalloc(r->size = get);
82 void nmem_reset(NMEM n)
92 n->blocks = n->blocks->next;
99 void *nmem_malloc(NMEM n, int size)
101 struct nmem_block *p;
105 return xmalloc(size);
108 if (!p || p->size - p->top < size)
116 p->top += (size + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
122 int nmem_total(NMEM n)
127 NMEM nmem_create(void)
134 cfreelist = cfreelist->next;
136 r = xmalloc(sizeof(*r));
144 void nmem_destroy(NMEM n)
155 void nmem_init (void)
158 InitializeCriticalSection(&critical_section);
164 void nmem_exit (void)
167 DeleteCriticalSection(&critical_section);