2 * Copyright (c) 1995-1999, Index Data.
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.15 1999-02-11 09:10:26 adam
8 * Function nmem_init only mandatory on Windows.
10 * Revision 1.14 1999/02/02 13:57:40 adam
11 * Uses preprocessor define WIN32 instead of WINDOWS to build code
12 * for Microsoft WIN32.
14 * Revision 1.13 1998/10/19 15:24:21 adam
15 * New nmem utility, nmem_transfer, that transfer blocks from one
18 * Revision 1.12 1998/10/13 16:00:18 adam
19 * Implemented nmem_critical_{enter,leave}.
21 * Revision 1.11 1998/08/21 14:13:36 adam
22 * Added GNU Configure script to build Makefiles.
24 * Revision 1.10 1998/07/20 12:35:57 adam
25 * Added more memory diagnostics (when NMEM_DEBUG is 1).
27 * Revision 1.9 1998/07/07 15:49:01 adam
30 * Revision 1.8 1998/07/03 14:21:27 adam
31 * Added critical sections for pthreads-library. Thanks to Ian Ibbotson,
32 * Fretwell Downing Informatics.
34 * Revision 1.7 1998/02/11 11:53:36 adam
35 * Changed code so that it compiles as C++.
37 * Revision 1.6 1997/10/31 12:20:09 adam
38 * Improved memory debugging for xmalloc/nmem.c. References to NMEM
39 * instead of ODR in n ESPEC-1 handling in source d1_espec.c.
40 * Bug fix: missing fclose in data1_read_espec1.
42 * Revision 1.5 1997/10/06 09:09:52 adam
43 * Function mmem_exit releases memory used by the freelists.
45 * Revision 1.4 1997/09/29 07:12:50 adam
46 * NMEM thread safe. NMEM must be initialized before use (sigh) -
47 * routine nmem_init/nmem_exit implemented.
49 * Revision 1.3 1997/07/21 12:47:38 adam
50 * Moved definition of nmem_control and nmem_block.
52 * Revision 1.2 1995/12/13 13:44:37 quinn
53 * Modified Data1-system to use nmem
55 * Revision 1.1 1995/11/13 09:27:52 quinn
56 * Fiddling with the variant stuff.
62 * This is a simple and fairly wasteful little module for nibble memory
63 * allocation. Evemtually we'll put in something better.
82 #define NMEM_CHUNK (4*1024)
85 static CRITICAL_SECTION critical_section;
86 #define NMEM_ENTER EnterCriticalSection(&critical_section)
87 #define NMEM_LEAVE LeaveCriticalSection(&critical_section)
89 static pthread_mutex_t nmem_mutex = PTHREAD_MUTEX_INITIALIZER;
90 #define NMEM_ENTER pthread_mutex_lock(&nmem_mutex);
91 #define NMEM_LEAVE pthread_mutex_unlock(&nmem_mutex);
97 static nmem_block *freelist = NULL; /* "global" freelists */
98 static nmem_control *cfreelist = NULL;
99 static int nmem_active_no = 0;
100 static int nmem_init_flag = 0;
102 static void free_block(nmem_block *p)
107 logf (LOG_DEBUG, "nmem free_block p=%p", p);
112 * acquire a block with a minimum of size free bytes.
114 static nmem_block *get_block(int size)
119 logf (LOG_DEBUG, "nmem get_block size=%d", size);
121 for (r = freelist, l = 0; r; l = r, r = r->next)
127 logf (LOG_DEBUG, "nmem get_block found free block p=%p", r);
136 int get = NMEM_CHUNK;
141 logf (LOG_DEBUG, "nmem get_block alloc new block size=%d", get);
143 r = (nmem_block *)xmalloc(sizeof(*r));
144 r->buf = (char *)xmalloc(r->size = get);
150 void nmem_reset(NMEM n)
155 logf (LOG_DEBUG, "nmem_reset p=%p", n);
163 n->blocks = n->blocks->next;
171 void *nmem_malloc_f (const char *file, int line, NMEM n, int size)
173 void *nmem_malloc(NMEM n, int size)
176 struct nmem_block *p;
180 logf (LOG_DEBUG, "%s:%d: nmem_malloc p=%p size=%d", file, line,
184 return xmalloc(size);
186 assert (nmem_init_flag);
190 if (!p || p->size - p->top < size)
198 p->top += (size + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
204 int nmem_total(NMEM n)
210 NMEM nmem_create_f(const char *file, int line)
212 NMEM nmem_create(void)
221 cfreelist = cfreelist->next;
223 r = (nmem_control *)xmalloc(sizeof(*r));
227 logf (LOG_DEBUG, "%s:%d: nmem_create %d p=%p", file, line,
228 nmem_active_no-1, r);
237 void nmem_destroy_f(const char *file, int line, NMEM n)
239 void nmem_destroy(NMEM n)
251 logf (LOG_DEBUG, "%s:%d: nmem_destroy %d p=%p", file, line,
256 void nmem_transfer (NMEM dst, NMEM src)
259 while ((t=src->blocks))
261 src->blocks = t->next;
262 t->next = dst->blocks;
265 dst->total += src->total;
269 void nmem_critical_enter (void)
274 void nmem_critical_leave (void)
279 void nmem_init (void)
283 InitializeCriticalSection(&critical_section);
290 void nmem_exit (void)
294 struct nmem_block *fl = freelist;
295 freelist = freelist->next;
301 struct nmem_control *cfl = cfreelist;
302 cfreelist = cfreelist->next;
306 DeleteCriticalSection(&critical_section);