1 | /* |
---|
2 | * malloc.h - User space memory allocator implementation. |
---|
3 | * |
---|
4 | * Author Alain Greiner (2016,2017) |
---|
5 | * |
---|
6 | * Copyright (c) UPMC Sorbonne Universites |
---|
7 | * |
---|
8 | * This file is part of ALMOS-MKH. |
---|
9 | * |
---|
10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
---|
11 | * under the terms of the GNU General Public License as published by |
---|
12 | * the Free Software Foundation; version 2.0 of the License. |
---|
13 | * |
---|
14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
---|
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
---|
17 | * General Public License for more details. |
---|
18 | * |
---|
19 | * You should have received a copy of the GNU General Public License |
---|
20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
---|
21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
---|
22 | */ |
---|
23 | |
---|
24 | #include <stdlib.h> |
---|
25 | #include <stdio.h> |
---|
26 | #include <malloc.h> |
---|
27 | #include <pthread.h> |
---|
28 | |
---|
29 | #define MALLOC_DEBUG 0 |
---|
30 | |
---|
31 | ///////////////////////////////////////////////////////////////////////////////////////// |
---|
32 | // Global variable defining the allocator array (one per cluster) |
---|
33 | // This array (about 16 Kbytes ) will be stored in the data segment |
---|
34 | // of any application linked with this malloc libray. |
---|
35 | ///////////////////////////////////////////////////////////////////////////////////////// |
---|
36 | |
---|
37 | malloc_store_t store[MALLOC_MAX_CLUSTERS]; |
---|
38 | |
---|
39 | // Macro returning the smallest power of 2 larger or equal to size value |
---|
40 | |
---|
41 | #define GET_SIZE_INDEX(size) (size <= 0x00000001) ? 0 :\ |
---|
42 | (size <= 0x00000002) ? 1 :\ |
---|
43 | (size <= 0x00000004) ? 2 :\ |
---|
44 | (size <= 0x00000008) ? 3 :\ |
---|
45 | (size <= 0x00000010) ? 4 :\ |
---|
46 | (size <= 0x00000020) ? 5 :\ |
---|
47 | (size <= 0x00000040) ? 6 :\ |
---|
48 | (size <= 0x00000080) ? 7 :\ |
---|
49 | (size <= 0x00000100) ? 8 :\ |
---|
50 | (size <= 0x00000200) ? 9 :\ |
---|
51 | (size <= 0x00000400) ? 10 :\ |
---|
52 | (size <= 0x00000800) ? 11 :\ |
---|
53 | (size <= 0x00001000) ? 12 :\ |
---|
54 | (size <= 0x00002000) ? 13 :\ |
---|
55 | (size <= 0x00004000) ? 14 :\ |
---|
56 | (size <= 0x00008000) ? 15 :\ |
---|
57 | (size <= 0x00010000) ? 16 :\ |
---|
58 | (size <= 0x00020000) ? 17 :\ |
---|
59 | (size <= 0x00040000) ? 18 :\ |
---|
60 | (size <= 0x00080000) ? 19 :\ |
---|
61 | (size <= 0x00100000) ? 20 :\ |
---|
62 | (size <= 0x00200000) ? 21 :\ |
---|
63 | (size <= 0x00400000) ? 22 :\ |
---|
64 | (size <= 0x00800000) ? 23 :\ |
---|
65 | (size <= 0x01000000) ? 24 :\ |
---|
66 | (size <= 0x02000000) ? 25 :\ |
---|
67 | (size <= 0x04000000) ? 26 :\ |
---|
68 | (size <= 0x08000000) ? 27 :\ |
---|
69 | (size <= 0x10000000) ? 28 :\ |
---|
70 | (size <= 0x20000000) ? 29 :\ |
---|
71 | (size <= 0x40000000) ? 30 :\ |
---|
72 | (size <= 0x80000000) ? 31 :\ |
---|
73 | 32 |
---|
74 | |
---|
75 | //////////////////////////////////////////////////////////////////////////////////////////// |
---|
76 | // This static function display the current state of the allocator in cluster <cxy>. |
---|
77 | //////////////////////////////////////////////////////////////////////////////////////////// |
---|
78 | |
---|
79 | #if 0 |
---|
80 | static void display_free_array( unsigned int cxy ) |
---|
81 | { |
---|
82 | unsigned int next; |
---|
83 | unsigned int id; |
---|
84 | unsigned int iter; |
---|
85 | |
---|
86 | printf("\n***** store[%x] base = %x / size = %x\n", |
---|
87 | cxy , store[cxy].store_base, store[cxy].store_size ); |
---|
88 | for ( id = 0 ; id < 32 ; id++ ) |
---|
89 | { |
---|
90 | next = store[cxy].free[id]; |
---|
91 | printf(" - free[%d] = " , id ); |
---|
92 | iter = 0; |
---|
93 | while ( next != 0 ) |
---|
94 | { |
---|
95 | printf("%x | ", next ); |
---|
96 | next = (*(unsigned int*)next); |
---|
97 | iter++; |
---|
98 | } |
---|
99 | printf("0\n"); |
---|
100 | } |
---|
101 | } // end display_free_array() |
---|
102 | #endif |
---|
103 | |
---|
104 | |
---|
105 | ////////////////////////////////////////////////////////////////////i////////////////////// |
---|
106 | // This static function initialises the store in the cluster identified by the <cxy> |
---|
107 | // arguments. It is called by the malloc() or remote_malloc when a specific store(x,y) |
---|
108 | // is accessed for the first time by a remote() or remote_malloc() request. |
---|
109 | // It uses the mmap( MAP_REMOTE ) syscall to allocate a new vseg mapped in cluster (cxy). |
---|
110 | ////////////////////////////////////////////////////////////////////i////////////////////// |
---|
111 | // @ cxy : target cluster identifier (fixed format). |
---|
112 | // @ store_size : store size (bytes). |
---|
113 | // # return without setting the initialized field in store(cxy) if failure. |
---|
114 | ////////////////////////////////////////////////////////////////////i////////////////////// |
---|
115 | static void store_init( unsigned int cxy, |
---|
116 | unsigned int store_size ) |
---|
117 | { |
---|
118 | unsigned int store_base; // store base address |
---|
119 | unsigned int free_index; // index in free[array] |
---|
120 | |
---|
121 | unsigned int alloc_base; // alloc[] array base |
---|
122 | unsigned int alloc_size; // alloc[] array size |
---|
123 | unsigned int alloc_index; // index in alloc[array] |
---|
124 | |
---|
125 | unsigned int iter; // iterator |
---|
126 | |
---|
127 | #if MALLOC_DEBUG |
---|
128 | printf("\n[MALLOC] %s : enter for store[%x] / size = %x\n", |
---|
129 | __FUNCTION__, cxy, store_size ); |
---|
130 | #endif |
---|
131 | |
---|
132 | // get index in free[] array from size |
---|
133 | free_index = GET_SIZE_INDEX( store_size ); |
---|
134 | |
---|
135 | // check store size power of 2 |
---|
136 | if( store_size != (1<<free_index) ) |
---|
137 | { |
---|
138 | printf("\n[ERROR] in %s : store[%x] size not power of 2 / size = %x\n", |
---|
139 | __FUNCTION__, cxy , store_size ); |
---|
140 | return; |
---|
141 | } |
---|
142 | |
---|
143 | // allocate store in virtual space |
---|
144 | void * vadr = mmap( NULL, // MAP_FIXED not supported |
---|
145 | store_size, |
---|
146 | PROT_READ | PROT_WRITE, |
---|
147 | MAP_REMOTE| MAP_SHARED, |
---|
148 | cxy, // fd is cluster identifier |
---|
149 | 0 ); // offset unused |
---|
150 | |
---|
151 | if( vadr == NULL ) |
---|
152 | { |
---|
153 | printf("\n[ERROR] in %s : cannot mmap store[%x]\n", |
---|
154 | __FUNCTION__, cxy ); |
---|
155 | return; |
---|
156 | } |
---|
157 | |
---|
158 | store_base = (unsigned int)vadr; |
---|
159 | |
---|
160 | // check allocated store alignment |
---|
161 | if( store_base % store_size ) |
---|
162 | { |
---|
163 | printf("\n[ERROR] in %s : store[%x] not aligned / base = %x / size = %x\n", |
---|
164 | __FUNCTION__, cxy , store_base , store_size ); |
---|
165 | return; |
---|
166 | } |
---|
167 | |
---|
168 | #if MALLOC_DEBUG |
---|
169 | printf("\n[MALLOC] %s : mmap done for store[%x] / base = %x\n", |
---|
170 | __FUNCTION__, cxy, store_base ); |
---|
171 | #endif |
---|
172 | |
---|
173 | // compute size of block containing alloc[] array |
---|
174 | alloc_size = store_size / MALLOC_MIN_BLOCK_SIZE; |
---|
175 | if ( alloc_size < MALLOC_MIN_BLOCK_SIZE) alloc_size = MALLOC_MIN_BLOCK_SIZE; |
---|
176 | |
---|
177 | // get index for the corresponding block |
---|
178 | alloc_index = GET_SIZE_INDEX( alloc_size ); |
---|
179 | |
---|
180 | // compute alloc[] array base address |
---|
181 | alloc_base = store_base + store_size - alloc_size; |
---|
182 | |
---|
183 | // reset the free[] array |
---|
184 | for ( iter = 0 ; iter < 32 ; iter++ ) |
---|
185 | { |
---|
186 | store[cxy].free[iter] = 0; |
---|
187 | } |
---|
188 | |
---|
189 | // DEPRECATED: we don't reset the alloc_size array |
---|
190 | // because we don't want to allocate the physical memory |
---|
191 | // when the heap is created [AG] |
---|
192 | // memset( (void *)alloc_base , 0 , alloc_size ); |
---|
193 | |
---|
194 | // split the store into various sizes blocks, |
---|
195 | // initializes the free[] array and NEXT pointers |
---|
196 | // base is the block base address |
---|
197 | unsigned int base = store_base; |
---|
198 | unsigned int * ptr; |
---|
199 | for ( iter = free_index-1 ; iter >= alloc_index ; iter-- ) |
---|
200 | { |
---|
201 | store[cxy].free[iter] = base; |
---|
202 | ptr = (unsigned int*)base; |
---|
203 | *ptr = 0; |
---|
204 | base = base + (1<<iter); |
---|
205 | } |
---|
206 | |
---|
207 | // initialize store mutex |
---|
208 | if( pthread_mutex_init( &store[cxy].mutex , NULL ) ) |
---|
209 | { |
---|
210 | printf("\n[ERROR] in %s : cannot initialize mutex for store[%x]\n", |
---|
211 | __FUNCTION__, cxy ); |
---|
212 | return; |
---|
213 | } |
---|
214 | |
---|
215 | store[cxy].cxy = cxy; |
---|
216 | store[cxy].store_base = store_base; |
---|
217 | store[cxy].store_size = store_size; |
---|
218 | store[cxy].alloc_size = alloc_size; |
---|
219 | store[cxy].alloc_base = alloc_base; |
---|
220 | store[cxy].initialized = MALLOC_INITIALIZED; |
---|
221 | |
---|
222 | |
---|
223 | #if MALLOC_DEBUG |
---|
224 | printf("\n[MALLOC] %s : completes store[%x] initialisation\n", |
---|
225 | __FUNCTION__, cxy ); |
---|
226 | |
---|
227 | display_free_array( cxy ); |
---|
228 | #endif |
---|
229 | |
---|
230 | } // end store_init() |
---|
231 | |
---|
232 | //////////////////////////////////////////////////////// |
---|
233 | static unsigned int split_block( malloc_store_t * store, |
---|
234 | unsigned int vaddr, |
---|
235 | unsigned int searched_index, |
---|
236 | unsigned int requested_index ) |
---|
237 | { |
---|
238 | // push the upper half block into free[searched_index-1] |
---|
239 | unsigned int* new = (unsigned int*)(vaddr + (1<<(searched_index-1))); |
---|
240 | *new = store->free[searched_index-1]; |
---|
241 | store->free[searched_index-1] = (unsigned int)new; |
---|
242 | |
---|
243 | if ( searched_index == requested_index + 1 ) // terminal case: return lower half block |
---|
244 | { |
---|
245 | return vaddr; |
---|
246 | } |
---|
247 | else // non terminal case : lower half block must be split again |
---|
248 | { |
---|
249 | return split_block( store, vaddr, searched_index-1, requested_index ); |
---|
250 | } |
---|
251 | } // end split_block() |
---|
252 | |
---|
253 | ////////////////////////////////////////////////////// |
---|
254 | static unsigned int get_block( malloc_store_t * store, |
---|
255 | unsigned int searched_index, |
---|
256 | unsigned int requested_index ) |
---|
257 | { |
---|
258 | // test terminal case |
---|
259 | if ( (1<<searched_index) > store->store_size ) // failure : return a NULL value |
---|
260 | { |
---|
261 | return 0; |
---|
262 | } |
---|
263 | else // search a block in free[searched_index] |
---|
264 | { |
---|
265 | unsigned int vaddr = store->free[searched_index]; |
---|
266 | if ( vaddr == 0 ) // block not found : search in free[searched_index+1] |
---|
267 | { |
---|
268 | return get_block( store, searched_index+1, requested_index ); |
---|
269 | } |
---|
270 | else // block found : pop it from free[searched_index] |
---|
271 | { |
---|
272 | // pop the block from free[searched_index] |
---|
273 | unsigned int next = *((unsigned int*)vaddr); |
---|
274 | store->free[searched_index] = next; |
---|
275 | |
---|
276 | // test if the block must be split |
---|
277 | if ( searched_index == requested_index ) // no split required |
---|
278 | { |
---|
279 | return vaddr; |
---|
280 | } |
---|
281 | else // split is required |
---|
282 | { |
---|
283 | return split_block( store, vaddr, searched_index, requested_index ); |
---|
284 | } |
---|
285 | } |
---|
286 | } |
---|
287 | } // end get_block() |
---|
288 | |
---|
289 | //////////////////////////////////////// |
---|
290 | void * remote_malloc( unsigned int size, |
---|
291 | unsigned int cxy ) |
---|
292 | { |
---|
293 | |
---|
294 | #if MALLOC_DEBUG |
---|
295 | printf("\n[MALLOC] %s : enter for size = %x / cxy = %x\n", |
---|
296 | __FUNCTION__ , size , cxy ); |
---|
297 | #endif |
---|
298 | |
---|
299 | // check arguments |
---|
300 | if( size == 0 ) |
---|
301 | { |
---|
302 | printf("\n[ERROR] in %s : requested size = 0 \n", |
---|
303 | __FUNCTION__ ); |
---|
304 | return NULL; |
---|
305 | } |
---|
306 | if( cxy >= MALLOC_MAX_CLUSTERS ) |
---|
307 | { |
---|
308 | printf("\n[ERROR] in %s : illegal cluster %x\n", |
---|
309 | __FUNCTION__ , cxy ); |
---|
310 | return NULL; |
---|
311 | } |
---|
312 | |
---|
313 | // initializes target store if required |
---|
314 | if( store[cxy].initialized != MALLOC_INITIALIZED ) |
---|
315 | { |
---|
316 | store_init( cxy , MALLOC_LOCAL_STORE_SIZE ); |
---|
317 | |
---|
318 | if( store[cxy].initialized != MALLOC_INITIALIZED ) |
---|
319 | { |
---|
320 | printf("\n[ERROR] in %s : cannot allocate store in cluster %x\n", |
---|
321 | __FUNCTION__ , cxy ); |
---|
322 | return NULL; |
---|
323 | } |
---|
324 | } |
---|
325 | |
---|
326 | // normalize size |
---|
327 | if ( size < MALLOC_MIN_BLOCK_SIZE ) size = MALLOC_MIN_BLOCK_SIZE; |
---|
328 | |
---|
329 | // compute requested_index for the free[] array |
---|
330 | unsigned int requested_index = GET_SIZE_INDEX( size ); |
---|
331 | |
---|
332 | // take the lock protecting access to store[cxy] |
---|
333 | pthread_mutex_lock( &store[cxy].mutex ); |
---|
334 | |
---|
335 | // call the recursive function get_block |
---|
336 | unsigned int base = get_block( &store[cxy], |
---|
337 | requested_index, |
---|
338 | requested_index ); |
---|
339 | |
---|
340 | // check block found |
---|
341 | if (base == 0) |
---|
342 | { |
---|
343 | pthread_mutex_unlock( &store[cxy].mutex ); |
---|
344 | printf("\n[ERROR] in %s : no more space in cluster %x\n", |
---|
345 | __FUNCTION__ , cxy ); |
---|
346 | return NULL; |
---|
347 | } |
---|
348 | |
---|
349 | // compute pointer in alloc[] array |
---|
350 | unsigned offset = (base - store[cxy].store_base) / MALLOC_MIN_BLOCK_SIZE; |
---|
351 | unsigned char * ptr = (unsigned char*)(store[cxy].alloc_base + offset); |
---|
352 | |
---|
353 | // DEPRECATED : we don't check the alloc[] array, |
---|
354 | // because it has not been initialised, to avoid |
---|
355 | // physical memory allocation at heap creation [AG] |
---|
356 | // if ( *ptr != 0 ) |
---|
357 | // { |
---|
358 | // pthread_mutex_unlock( &store[cxy].mutex ); |
---|
359 | // printf("\n[PANIC] in %s : allocate an already allocated block...\n", |
---|
360 | // __FUNCTION__ ); |
---|
361 | // return NULL; |
---|
362 | // } |
---|
363 | |
---|
364 | // update alloc_array |
---|
365 | *ptr = requested_index; |
---|
366 | |
---|
367 | // release the lock |
---|
368 | pthread_mutex_unlock( &store[cxy].mutex ); |
---|
369 | |
---|
370 | #if MALLOC_DEBUG |
---|
371 | printf("\n[MALLOC] %s : exit / base = %x / size = %x / from store[%x]\n", |
---|
372 | __FUNCTION__, base , size , cxy ); |
---|
373 | #endif |
---|
374 | |
---|
375 | return (void*) base; |
---|
376 | |
---|
377 | } // end remote_malloc() |
---|
378 | |
---|
379 | |
---|
380 | ////////////////////////////////// |
---|
381 | void * malloc( unsigned int size ) |
---|
382 | { |
---|
383 | // get cluster identifier |
---|
384 | unsigned int cxy; |
---|
385 | unsigned int lid; |
---|
386 | get_core( &cxy , &lid ); |
---|
387 | |
---|
388 | return remote_malloc( size, cxy ); |
---|
389 | } |
---|
390 | |
---|
391 | |
---|
392 | ////////////////////////////////////////// |
---|
393 | void * remote_calloc ( unsigned int count, |
---|
394 | unsigned int size, |
---|
395 | unsigned int cxy ) |
---|
396 | { |
---|
397 | void * ptr = remote_malloc( count * size , cxy ); |
---|
398 | memset( ptr , 0 , count * size ); |
---|
399 | return ptr; |
---|
400 | } |
---|
401 | |
---|
402 | /////////////////////////////////// |
---|
403 | void * calloc ( unsigned int count, |
---|
404 | unsigned int size ) |
---|
405 | { |
---|
406 | // get calling core cluster identifier |
---|
407 | unsigned int cxy; |
---|
408 | unsigned int lid; |
---|
409 | get_core( &cxy , &lid ); |
---|
410 | |
---|
411 | return remote_calloc( count , size , cxy ); |
---|
412 | } |
---|
413 | |
---|
414 | ////////////////////////////////// |
---|
415 | void * remote_realloc( void * ptr, |
---|
416 | unsigned int size, |
---|
417 | unsigned int cxy ) |
---|
418 | { |
---|
419 | // simple allocation when (ptr == NULL) |
---|
420 | if( ptr == NULL ) |
---|
421 | { |
---|
422 | return remote_malloc( size , cxy ); |
---|
423 | } |
---|
424 | |
---|
425 | // simple free when (size == 0) |
---|
426 | if( size == 0 ) |
---|
427 | { |
---|
428 | remote_free( ptr , cxy ); |
---|
429 | return NULL; |
---|
430 | } |
---|
431 | |
---|
432 | // check cxy and ptr in general case |
---|
433 | if( cxy >= MALLOC_MAX_CLUSTERS ) |
---|
434 | { |
---|
435 | printf("\n[ERROR] in %s : illegal cluster index %x\n", |
---|
436 | __FUNCTION__ , cxy ); |
---|
437 | return NULL; |
---|
438 | } |
---|
439 | |
---|
440 | unsigned int base = (unsigned int)ptr; |
---|
441 | |
---|
442 | if( (base < store[cxy].store_base) || |
---|
443 | (base >= (store[cxy].store_base + store[cxy].store_size)) ) |
---|
444 | { |
---|
445 | printf("\n[ERROR] in %s : illegal pointer = %x\n", |
---|
446 | __FUNCTION__, ptr ); |
---|
447 | return NULL; |
---|
448 | } |
---|
449 | |
---|
450 | // compute index in free[] array |
---|
451 | int index = (base - store[cxy].store_base) / MALLOC_MIN_BLOCK_SIZE; |
---|
452 | |
---|
453 | // compute old size |
---|
454 | char * pchar = (char *) (store[cxy].alloc_base + index); |
---|
455 | int old_size = 1 << ((int) *pchar); |
---|
456 | |
---|
457 | // allocate a new block |
---|
458 | void * new_ptr = remote_malloc( size , cxy ); |
---|
459 | |
---|
460 | // save old data to new block |
---|
461 | int min_size = (size < old_size) ? size : old_size; |
---|
462 | memcpy( new_ptr, ptr, min_size ); |
---|
463 | |
---|
464 | // release old block |
---|
465 | remote_free( ptr , cxy ); |
---|
466 | |
---|
467 | return new_ptr; |
---|
468 | } |
---|
469 | |
---|
470 | /////////////////////////////////// |
---|
471 | void * realloc ( void * ptr, |
---|
472 | unsigned int size ) |
---|
473 | { |
---|
474 | // get calling core cluster identifier |
---|
475 | unsigned int cxy; |
---|
476 | unsigned int lid; |
---|
477 | get_core( &cxy , &lid ); |
---|
478 | |
---|
479 | return remote_realloc( ptr , size , cxy ); |
---|
480 | } |
---|
481 | |
---|
482 | |
---|
483 | |
---|
484 | ////////////////////////////////////////////////////// |
---|
485 | static void update_free_array( malloc_store_t * store, |
---|
486 | unsigned int base, |
---|
487 | unsigned int size_index ) |
---|
488 | { |
---|
489 | // This recursive function try to merge the released block |
---|
490 | // with the companion block if this companion block is free. |
---|
491 | // This companion has the same size, and almost the same address |
---|
492 | // (only one address bit is different) |
---|
493 | // - If the companion is not in free[size_index], |
---|
494 | // the released block is pushed in free[size_index]. |
---|
495 | // - If the companion is found, it is evicted from free[size_index] |
---|
496 | // and the merged bloc is pushed in the free[size_index+1]. |
---|
497 | |
---|
498 | |
---|
499 | // compute released block size |
---|
500 | unsigned int size = 1<<size_index; |
---|
501 | |
---|
502 | // compute companion block and merged block base addresses |
---|
503 | unsigned int companion_base; |
---|
504 | unsigned int merged_base; |
---|
505 | |
---|
506 | if ( (base & size) == 0 ) // the released block is aligned on (2*size) |
---|
507 | { |
---|
508 | companion_base = base + size; |
---|
509 | merged_base = base; |
---|
510 | } |
---|
511 | else |
---|
512 | { |
---|
513 | companion_base = base - size; |
---|
514 | merged_base = base - size; |
---|
515 | } |
---|
516 | |
---|
517 | // scan all blocks in free[size_index] |
---|
518 | // the iter & prev variables are actually addresses |
---|
519 | unsigned int found = 0; |
---|
520 | unsigned int iter = store->free[size_index]; |
---|
521 | unsigned int prev = (unsigned int)&store->free[size_index]; |
---|
522 | while ( iter ) |
---|
523 | { |
---|
524 | if ( iter == companion_base ) |
---|
525 | { |
---|
526 | found = 1; |
---|
527 | break; |
---|
528 | } |
---|
529 | prev = iter; |
---|
530 | iter = *(unsigned int*)iter; |
---|
531 | } |
---|
532 | |
---|
533 | if ( found == 0 ) // Companion not found => push in free[size_index] |
---|
534 | { |
---|
535 | *(unsigned int*)base = store->free[size_index]; |
---|
536 | store->free[size_index] = base; |
---|
537 | } |
---|
538 | else // Companion found : merge |
---|
539 | { |
---|
540 | // evict the searched block from free[size_index] |
---|
541 | *(unsigned int*)prev = *(unsigned int*)iter; |
---|
542 | |
---|
543 | // call the update_free() function for free[size_index+1] |
---|
544 | update_free_array( store, merged_base , size_index+1 ); |
---|
545 | } |
---|
546 | } // end update_free_array() |
---|
547 | |
---|
548 | //////////////////////////////////// |
---|
549 | void remote_free( void * ptr, |
---|
550 | unsigned int cxy ) |
---|
551 | { |
---|
552 | |
---|
553 | #if MALLOC_DEBUG |
---|
554 | printf("\n[MALLOC] %s : enter for block = %x / cxy = %x\n", |
---|
555 | __FUNCTION__, ptr, cxy ); |
---|
556 | #endif |
---|
557 | |
---|
558 | unsigned int base = (unsigned int)ptr; |
---|
559 | |
---|
560 | // check cxy value |
---|
561 | if( cxy >= MALLOC_MAX_CLUSTERS ) |
---|
562 | { |
---|
563 | printf("\n[ERROR] in %s : illegal cluster index %x\n", |
---|
564 | __FUNCTION__ , cxy ); |
---|
565 | return; |
---|
566 | } |
---|
567 | |
---|
568 | // check ptr value |
---|
569 | if( (base < store[cxy].store_base) || |
---|
570 | (base >= (store[cxy].store_base + store[cxy].store_size)) ) |
---|
571 | { |
---|
572 | printf("\n[ERROR] in %s : illegal pointer for released block = %x\n", |
---|
573 | __FUNCTION__, ptr ); |
---|
574 | return; |
---|
575 | } |
---|
576 | |
---|
577 | // get the lock protecting store[cxy] |
---|
578 | pthread_mutex_lock( &store[cxy].mutex ); |
---|
579 | |
---|
580 | // compute released block index in alloc[] array |
---|
581 | unsigned index = (base - store[cxy].store_base ) / MALLOC_MIN_BLOCK_SIZE; |
---|
582 | |
---|
583 | // get the released block size_index |
---|
584 | unsigned char* pchar = (unsigned char*)(store[cxy].alloc_base + index); |
---|
585 | unsigned int size_index = (unsigned int)*pchar; |
---|
586 | |
---|
587 | // check block is allocated |
---|
588 | if ( size_index == 0 ) |
---|
589 | { |
---|
590 | pthread_mutex_unlock( &store[cxy].mutex ); |
---|
591 | printf("\n[ERROR] in %s : released block not allocated / ptr = %x\n", |
---|
592 | __FUNCTION__, ptr ); |
---|
593 | return; |
---|
594 | } |
---|
595 | |
---|
596 | // check released block alignment |
---|
597 | if ( base % (1 << size_index) ) |
---|
598 | { |
---|
599 | pthread_mutex_unlock( &store[cxy].mutex ); |
---|
600 | printf("\n[ERROR] in %s : released block not aligned / ptr = %x\n", |
---|
601 | __FUNCTION__, ptr ); |
---|
602 | return; |
---|
603 | } |
---|
604 | |
---|
605 | // reset the alloc[index] entry |
---|
606 | *pchar = 0; |
---|
607 | |
---|
608 | // call the recursive function update_free_array() |
---|
609 | update_free_array( &store[cxy], base, size_index ); |
---|
610 | |
---|
611 | // release the lock |
---|
612 | pthread_mutex_unlock( &store[cxy].mutex ); |
---|
613 | |
---|
614 | #if MALLOC_DEBUG |
---|
615 | printf("\n[MALLOC] %s : conmpletes for block = %x / cxy = %x\n", |
---|
616 | __FUNCTION__, ptr, cxy ); |
---|
617 | #endif |
---|
618 | |
---|
619 | } // end remote_free() |
---|
620 | |
---|
621 | /////////////////////// |
---|
622 | void free( void * ptr ) |
---|
623 | { |
---|
624 | // get calling core cluster identifier |
---|
625 | unsigned int cxy; |
---|
626 | unsigned int lid; |
---|
627 | get_core( &cxy , &lid ); |
---|
628 | |
---|
629 | remote_free( ptr , cxy ); |
---|
630 | } |
---|
631 | |
---|
632 | |
---|
633 | // Local Variables: |
---|
634 | // tab-width: 4 |
---|
635 | // c-basic-offset: 4 |
---|
636 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
---|
637 | // indent-tabs-mode: nil |
---|
638 | // End: |
---|
639 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
---|
640 | |
---|
641 | |
---|
642 | |
---|