2 * Copyright (c) 1995-1998, Index Data.
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.9 1998-07-07 15:49:01 adam
10 * Revision 1.8 1998/07/03 14:21:27 adam
11 * Added critical sections for pthreads-library. Thanks to Ian Ibbotson,
12 * Fretwell Downing Informatics.
14 * Revision 1.7 1998/02/11 11:53:36 adam
15 * Changed code so that it compiles as C++.
17 * Revision 1.6 1997/10/31 12:20:09 adam
18 * Improved memory debugging for xmalloc/nmem.c. References to NMEM
19 * instead of ODR in n ESPEC-1 handling in source d1_espec.c.
20 * Bug fix: missing fclose in data1_read_espec1.
22 * Revision 1.5 1997/10/06 09:09:52 adam
23 * Function mmem_exit releases memory used by the freelists.
25 * Revision 1.4 1997/09/29 07:12:50 adam
26 * NMEM thread safe. NMEM must be initialized before use (sigh) -
27 * routine nmem_init/nmem_exit implemented.
29 * Revision 1.3 1997/07/21 12:47:38 adam
30 * Moved definition of nmem_control and nmem_block.
32 * Revision 1.2 1995/12/13 13:44:37 quinn
33 * Modified Data1-system to use nmem
35 * Revision 1.1 1995/11/13 09:27:52 quinn
36 * Fiddling with the variant stuff.
42 * This is a simple and fairly wasteful little module for nibble memory
43 * allocation. Evemtually we'll put in something better.
55 #define NMEM_CHUNK (4*1024)
58 static CRITICAL_SECTION critical_section;
59 #define NMEM_ENTER EnterCriticalSection(&critical_section)
60 #define NMEM_LEAVE LeaveCriticalSection(&critical_section)
62 static pthread_mutex_t nmem_mutex;
63 #define NMEM_ENTER pthread_mutex_lock(&nmem_mutex);
64 #define NMEM_LEAVE pthread_mutex_unlock(&nmem_mutex);
70 static nmem_block *freelist = NULL; /* "global" freelists */
71 static nmem_control *cfreelist = NULL;
72 static int nmem_active_no = 0;
74 static void free_block(nmem_block *p)
81 * acquire a block with a minimum of size free bytes.
83 static nmem_block *get_block(int size)
87 for (r = freelist, l = 0; r; l = r, r = r->next)
103 r = (nmem_block *)xmalloc(sizeof(*r));
104 r->buf = (char *)xmalloc(r->size = get);
110 void nmem_reset(NMEM n)
120 n->blocks = n->blocks->next;
127 void *nmem_malloc(NMEM n, int size)
129 struct nmem_block *p;
133 return xmalloc(size);
136 if (!p || p->size - p->top < size)
144 p->top += (size + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
150 int nmem_total(NMEM n)
156 NMEM nmem_create_f(const char *file, int line)
158 NMEM nmem_create(void)
167 cfreelist = cfreelist->next;
169 r = (nmem_control *)xmalloc(sizeof(*r));
173 logf (LOG_DEBUG, "%s:%d: nmem_create %d p=%p", file, line,
174 nmem_active_no-1, r);
183 void nmem_destroy_f(const char *file, int line, NMEM n)
185 void nmem_destroy(NMEM n)
197 logf (LOG_DEBUG, "%s:%d: nmem_destroy %d p=%p", file, line,
202 void nmem_init (void)
205 InitializeCriticalSection(&critical_section);
212 void nmem_exit (void)
216 struct nmem_block *fl = freelist;
217 freelist = freelist->next;
223 struct nmem_control *cfl = cfreelist;
224 cfreelist = cfreelist->next;
228 DeleteCriticalSection(&critical_section);