2 * Copyright (c) 1995-2000, Index Data.
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.25 2001-06-26 14:11:27 adam
8 * Added MUTEX functions for NMEM module (used by OID utility).
10 * Revision 1.24 2000/05/11 14:37:55 adam
13 * Revision 1.23 2000/05/09 10:55:05 adam
14 * Public nmem_print_list (for debugging).
16 * Revision 1.22 2000/05/03 22:00:00 adam
17 * Reference counter (if multiple modules are init/freeing nmem).
19 * Revision 1.21 2000/02/29 13:44:55 adam
20 * Check for config.h (currently not generated).
22 * Revision 1.20 2000/01/06 14:59:13 adam
23 * Added oid_init/oid_exit. Changed oid_exit.
25 * Revision 1.19 1999/11/30 13:47:12 adam
26 * Improved installation. Moved header files to include/yaz.
28 * Revision 1.18 1999/08/27 09:40:32 adam
29 * Renamed logf function to yaz_log. Removed VC++ project files.
31 * Revision 1.17 1999/07/13 13:28:25 adam
32 * Better debugging for NMEM routines.
34 * Revision 1.16 1999/03/31 11:18:25 adam
35 * Implemented odr_strdup. Added Reference ID to backend server API.
37 * Revision 1.15 1999/02/11 09:10:26 adam
38 * Function nmem_init only mandatory on Windows.
40 * Revision 1.14 1999/02/02 13:57:40 adam
41 * Uses preprocessor define WIN32 instead of WINDOWS to build code
42 * for Microsoft WIN32.
44 * Revision 1.13 1998/10/19 15:24:21 adam
45 * New nmem utility, nmem_transfer, that transfer blocks from one
48 * Revision 1.12 1998/10/13 16:00:18 adam
49 * Implemented nmem_critical_{enter,leave}.
51 * Revision 1.11 1998/08/21 14:13:36 adam
52 * Added GNU Configure script to build Makefiles.
54 * Revision 1.10 1998/07/20 12:35:57 adam
55 * Added more memory diagnostics (when NMEM_DEBUG is 1).
57 * Revision 1.9 1998/07/07 15:49:01 adam
60 * Revision 1.8 1998/07/03 14:21:27 adam
61 * Added critical sections for pthreads-library. Thanks to Ian Ibbotson,
62 * Fretwell Downing Informatics.
64 * Revision 1.7 1998/02/11 11:53:36 adam
65 * Changed code so that it compiles as C++.
67 * Revision 1.6 1997/10/31 12:20:09 adam
68 * Improved memory debugging for xmalloc/nmem.c. References to NMEM
69 * instead of ODR in n ESPEC-1 handling in source d1_espec.c.
70 * Bug fix: missing fclose in data1_read_espec1.
72 * Revision 1.5 1997/10/06 09:09:52 adam
73 * Function mmem_exit releases memory used by the freelists.
75 * Revision 1.4 1997/09/29 07:12:50 adam
76 * NMEM thread safe. NMEM must be initialized before use (sigh) -
77 * routine nmem_init/nmem_exit implemented.
79 * Revision 1.3 1997/07/21 12:47:38 adam
80 * Moved definition of nmem_control and nmem_block.
82 * Revision 1.2 1995/12/13 13:44:37 quinn
83 * Modified Data1-system to use nmem
85 * Revision 1.1 1995/11/13 09:27:52 quinn
86 * Fiddling with the variant stuff.
92 * This is a simple and fairly wasteful little module for nibble memory
93 * allocation. Evemtually we'll put in something better.
101 #include <yaz/xmalloc.h>
102 #include <yaz/nmem.h>
116 #define NMEM_CHUNK (4*1024)
119 static CRITICAL_SECTION critical_section;
120 #define NMEM_ENTER EnterCriticalSection(&critical_section)
121 #define NMEM_LEAVE LeaveCriticalSection(&critical_section)
123 static pthread_mutex_t nmem_mutex = PTHREAD_MUTEX_INITIALIZER;
124 #define NMEM_ENTER pthread_mutex_lock(&nmem_mutex);
125 #define NMEM_LEAVE pthread_mutex_unlock(&nmem_mutex);
134 CRITICAL_SECTION m_handle;
136 pthread_mutex_t m_handle;
142 YAZ_EXPORT void nmem_mutex_create(NMEM_MUTEX *p)
147 *p = malloc (sizeof(**p));
149 InitializeCriticalSection(&(*p)->m_handle);
151 pthread_mutex_init (&(*p)->m_handle, 0);
157 YAZ_EXPORT void nmem_mutex_enter(NMEM_MUTEX p)
162 EnterCriticalSection(&p->m_handle);
164 pthread_mutex_lock(&p->m_handle);
169 YAZ_EXPORT void nmem_mutex_leave(NMEM_MUTEX p)
174 LeaveCriticalSection(&p->m_handle);
176 pthread_mutex_unlock(&p->m_handle);
181 YAZ_EXPORT void nmem_mutex_destroy(NMEM_MUTEX *p)
187 DeleteCriticalSection(&(*p)->m_handle);
195 static nmem_block *freelist = NULL; /* "global" freelists */
196 static nmem_control *cfreelist = NULL;
197 static int nmem_active_no = 0;
198 static int nmem_init_flag = 0;
201 struct nmem_debug_info {
205 struct nmem_debug_info *next;
208 struct nmem_debug_info *nmem_debug_list = 0;
211 static void free_block(nmem_block *p)
216 yaz_log (LOG_DEBUG, "nmem free_block p=%p", p);
221 void nmem_print_list (void)
223 struct nmem_debug_info *p;
225 yaz_log (LOG_DEBUG, "nmem print list");
227 for (p = nmem_debug_list; p; p = p->next)
228 yaz_log (LOG_DEBUG, " %s:%d p=%p size=%d", p->file, p->line, p->p,
234 * acquire a block with a minimum of size free bytes.
236 static nmem_block *get_block(int size)
241 yaz_log (LOG_DEBUG, "nmem get_block size=%d", size);
243 for (r = freelist, l = 0; r; l = r, r = r->next)
249 yaz_log (LOG_DEBUG, "nmem get_block found free block p=%p", r);
258 int get = NMEM_CHUNK;
263 yaz_log (LOG_DEBUG, "nmem get_block alloc new block size=%d", get);
265 r = (nmem_block *)xmalloc(sizeof(*r));
266 r->buf = (char *)xmalloc(r->size = get);
272 void nmem_reset(NMEM n)
277 yaz_log (LOG_DEBUG, "nmem_reset p=%p", n);
285 n->blocks = n->blocks->next;
293 void *nmem_malloc_f (const char *file, int line, NMEM n, int size)
295 void *nmem_malloc(NMEM n, int size)
298 struct nmem_block *p;
302 yaz_log (LOG_DEBUG, "%s:%d: nmem_malloc p=%p size=%d", file, line,
308 return xmalloc(size);
311 assert (nmem_init_flag);
315 if (!p || p->size - p->top < size)
323 p->top += (size + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
329 int nmem_total(NMEM n)
335 NMEM nmem_create_f(const char *file, int line)
337 NMEM nmem_create(void)
342 struct nmem_debug_info *debug_p;
349 cfreelist = cfreelist->next;
351 r = (nmem_control *)xmalloc(sizeof(*r));
355 yaz_log (LOG_DEBUG, "%s:%d: nmem_create %d p=%p", file, line,
363 for (debug_p = nmem_debug_list; debug_p; debug_p = debug_p->next)
366 yaz_log (LOG_FATAL, "multi used block in nmem");
369 debug_p = xmalloc (sizeof(*debug_p));
370 strncpy (debug_p->file, file, sizeof(debug_p->file)-1);
371 debug_p->file[sizeof(debug_p->file)-1] = '\0';
372 debug_p->line = line;
374 debug_p->next = nmem_debug_list;
375 nmem_debug_list = debug_p;
383 void nmem_destroy_f(const char *file, int line, NMEM n)
385 void nmem_destroy(NMEM n)
389 struct nmem_debug_info **debug_p;
396 yaz_log (LOG_DEBUG, "%s:%d: nmem_destroy %d p=%p", file, line,
397 nmem_active_no-1, n);
399 for (debug_p = &nmem_debug_list; *debug_p; debug_p = &(*debug_p)->next)
400 if ((*debug_p)->p == n)
402 struct nmem_debug_info *debug_save = *debug_p;
403 *debug_p = (*debug_p)->next;
412 yaz_log (LOG_WARN, "%s:%d destroying unallocated nmem block p=%p",
425 void nmem_transfer (NMEM dst, NMEM src)
428 while ((t=src->blocks))
430 src->blocks = t->next;
431 t->next = dst->blocks;
434 dst->total += src->total;
438 void nmem_critical_enter (void)
443 void nmem_critical_leave (void)
448 void nmem_init (void)
450 if (++nmem_init_flag == 1)
453 InitializeCriticalSection(&critical_section);
461 void nmem_exit (void)
463 if (--nmem_init_flag == 0)
467 struct nmem_block *fl = freelist;
468 freelist = freelist->next;
474 struct nmem_control *cfl = cfreelist;
475 cfreelist = cfreelist->next;
479 DeleteCriticalSection(&critical_section);