2 * Copyright (c) 1995-1998, Index Data.
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.13 1998-10-19 15:24:21 adam
8 * New nmem utility, nmem_transfer, that transfer blocks from one
11 * Revision 1.12 1998/10/13 16:00:18 adam
12 * Implemented nmem_critical_{enter,leave}.
14 * Revision 1.11 1998/08/21 14:13:36 adam
15 * Added GNU Configure script to build Makefiles.
17 * Revision 1.10 1998/07/20 12:35:57 adam
18 * Added more memory diagnostics (when NMEM_DEBUG is 1).
20 * Revision 1.9 1998/07/07 15:49:01 adam
23 * Revision 1.8 1998/07/03 14:21:27 adam
24 * Added critical sections for pthreads-library. Thanks to Ian Ibbotson,
25 * Fretwell Downing Informatics.
27 * Revision 1.7 1998/02/11 11:53:36 adam
28 * Changed code so that it compiles as C++.
30 * Revision 1.6 1997/10/31 12:20:09 adam
31 * Improved memory debugging for xmalloc/nmem.c. References to NMEM
32 * instead of ODR in n ESPEC-1 handling in source d1_espec.c.
33 * Bug fix: missing fclose in data1_read_espec1.
35 * Revision 1.5 1997/10/06 09:09:52 adam
36 * Function mmem_exit releases memory used by the freelists.
38 * Revision 1.4 1997/09/29 07:12:50 adam
39 * NMEM thread safe. NMEM must be initialized before use (sigh) -
40 * routine nmem_init/nmem_exit implemented.
42 * Revision 1.3 1997/07/21 12:47:38 adam
43 * Moved definition of nmem_control and nmem_block.
45 * Revision 1.2 1995/12/13 13:44:37 quinn
46 * Modified Data1-system to use nmem
48 * Revision 1.1 1995/11/13 09:27:52 quinn
49 * Fiddling with the variant stuff.
55 * This is a simple and fairly wasteful little module for nibble memory
56 * allocation. Evemtually we'll put in something better.
74 #define NMEM_CHUNK (4*1024)
77 static CRITICAL_SECTION critical_section;
78 #define NMEM_ENTER EnterCriticalSection(&critical_section)
79 #define NMEM_LEAVE LeaveCriticalSection(&critical_section)
81 static pthread_mutex_t nmem_mutex = PTHREAD_MUTEX_INITIALIZER;
82 #define NMEM_ENTER pthread_mutex_lock(&nmem_mutex);
83 #define NMEM_LEAVE pthread_mutex_unlock(&nmem_mutex);
89 static nmem_block *freelist = NULL; /* "global" freelists */
90 static nmem_control *cfreelist = NULL;
91 static int nmem_active_no = 0;
93 static void free_block(nmem_block *p)
98 logf (LOG_DEBUG, "nmem free_block p=%p", p);
103 * acquire a block with a minimum of size free bytes.
105 static nmem_block *get_block(int size)
110 logf (LOG_DEBUG, "nmem get_block size=%d", size);
112 for (r = freelist, l = 0; r; l = r, r = r->next)
118 logf (LOG_DEBUG, "nmem get_block found free block p=%p", r);
127 int get = NMEM_CHUNK;
132 logf (LOG_DEBUG, "nmem get_block alloc new block size=%d", get);
134 r = (nmem_block *)xmalloc(sizeof(*r));
135 r->buf = (char *)xmalloc(r->size = get);
141 void nmem_reset(NMEM n)
146 logf (LOG_DEBUG, "nmem_reset p=%p", n);
154 n->blocks = n->blocks->next;
162 void *nmem_malloc_f (const char *file, int line, NMEM n, int size)
164 void *nmem_malloc(NMEM n, int size)
167 struct nmem_block *p;
171 logf (LOG_DEBUG, "%s:%d: nmem_malloc p=%p size=%d", file, line,
175 return xmalloc(size);
178 if (!p || p->size - p->top < size)
186 p->top += (size + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
192 int nmem_total(NMEM n)
198 NMEM nmem_create_f(const char *file, int line)
200 NMEM nmem_create(void)
209 cfreelist = cfreelist->next;
211 r = (nmem_control *)xmalloc(sizeof(*r));
215 logf (LOG_DEBUG, "%s:%d: nmem_create %d p=%p", file, line,
216 nmem_active_no-1, r);
225 void nmem_destroy_f(const char *file, int line, NMEM n)
227 void nmem_destroy(NMEM n)
239 logf (LOG_DEBUG, "%s:%d: nmem_destroy %d p=%p", file, line,
244 void nmem_transfer (NMEM dst, NMEM src)
247 while ((t=src->blocks))
249 src->blocks = t->next;
250 t->next = dst->blocks;
253 dst->total += src->total;
257 void nmem_critical_enter (void)
262 void nmem_critical_leave (void)
267 void nmem_init (void)
270 InitializeCriticalSection(&critical_section);
277 void nmem_exit (void)
281 struct nmem_block *fl = freelist;
282 freelist = freelist->next;
288 struct nmem_control *cfl = cfreelist;
289 cfreelist = cfreelist->next;
293 DeleteCriticalSection(&critical_section);