2 * Copyright (c) 1995-1997, Index Data.
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.7 1998-02-11 11:53:36 adam
8 * Changed code so that it compiles as C++.
10 * Revision 1.6 1997/10/31 12:20:09 adam
11 * Improved memory debugging for xmalloc/nmem.c. References to NMEM
12 * instead of ODR in n ESPEC-1 handling in source d1_espec.c.
13 * Bug fix: missing fclose in data1_read_espec1.
15 * Revision 1.5 1997/10/06 09:09:52 adam
16 * Function mmem_exit releases memory used by the freelists.
18 * Revision 1.4 1997/09/29 07:12:50 adam
19 * NMEM thread safe. NMEM must be initialized before use (sigh) -
20 * routine nmem_init/nmem_exit implemented.
22 * Revision 1.3 1997/07/21 12:47:38 adam
23 * Moved definition of nmem_control and nmem_block.
25 * Revision 1.2 1995/12/13 13:44:37 quinn
26 * Modified Data1-system to use nmem
28 * Revision 1.1 1995/11/13 09:27:52 quinn
29 * Fiddling with the variant stuff.
35 * This is a simple and fairly wasteful little module for nibble memory
36 * allocation. Evemtually we'll put in something better.
46 #define NMEM_CHUNK (10*1024)
49 static CRITICAL_SECTION critical_section;
50 #define NMEM_ENTER EnterCriticalSection(&critical_section)
51 #define NMEM_LEAVE LeaveCriticalSection(&critical_section)
57 static nmem_block *freelist = NULL; /* "global" freelists */
58 static nmem_control *cfreelist = NULL;
59 static int nmem_active_no = 0;
61 static void free_block(nmem_block *p)
68 * acquire a block with a minimum of size free bytes.
70 static nmem_block *get_block(int size)
74 for (r = freelist, l = 0; r; l = r, r = r->next)
88 r = (nmem_block *)xmalloc(sizeof(*r));
89 r->buf = (char *)xmalloc(r->size = get);
95 void nmem_reset(NMEM n)
105 n->blocks = n->blocks->next;
112 void *nmem_malloc(NMEM n, int size)
114 struct nmem_block *p;
118 return xmalloc(size);
121 if (!p || p->size - p->top < size)
129 p->top += (size + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
135 int nmem_total(NMEM n)
141 NMEM nmem_create_f(const char *file, int line)
143 NMEM nmem_create(void)
152 cfreelist = cfreelist->next;
154 r = (nmem_control *)xmalloc(sizeof(*r));
158 logf (LOG_DEBUG, "%s:%d: nmem_create %d p=%p", file, line,
159 nmem_active_no-1, r);
168 void nmem_destroy_f(const char *file, int line, NMEM n)
170 void nmem_destroy(NMEM n)
182 logf (LOG_DEBUG, "%s:%d: nmem_destroy %d p=%p", file, line,
187 void nmem_init (void)
190 InitializeCriticalSection(&critical_section);
197 void nmem_exit (void)
201 struct nmem_block *fl = freelist;
202 freelist = freelist->next;
208 struct nmem_control *cfl = cfreelist;
209 cfreelist = cfreelist->next;
213 DeleteCriticalSection(&critical_section);