compat/nedmalloc/nedmalloc.c

   1 /* Alternative malloc implementation for multiple threads without
   2 lock contention based on dlmalloc. (C) 2005-2006 Niall Douglas
   3
   4 Boost Software License - Version 1.0 - August 17th, 2003
   5
   6 Permission is hereby granted, free of charge, to any person or organization
   7 obtaining a copy of the software and accompanying documentation covered by
   8 this license (the "Software") to use, reproduce, display, distribute,
   9 execute, and transmit the Software, and to prepare derivative works of the
  10 Software, and to permit third-parties to whom the Software is furnished to
  11 do so, all subject to the following:
  12
  13 The copyright notices in the Software and this entire statement, including
  14 the above license grant, this restriction and the following disclaimer,
  15 must be included in all copies of the Software, in whole or in part, and
  16 all derivative works of the Software, unless such copies or derivative
  17 works are solely in the form of machine-executable object code generated by
  18 a source language processor.
  19
  20 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
  23 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
  24 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
  25 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  26 DEALINGS IN THE SOFTWARE.
  27 */
  28
  29 #ifdef _MSC_VER
  30 /* Enable full aliasing on MSVC */
  31 /*#pragma optimize("a", on)*/
  32 #endif
  33
  34 /*#define FULLSANITYCHECKS*/
  35
  36 #include "nedmalloc.h"
  37 #if defined(WIN32)
  38  #include <malloc.h>
  39 #endif
  40 #define MSPACES 1
  41 #define ONLY_MSPACES 1
  42 #ifndef USE_LOCKS
  43  #define USE_LOCKS 1
  44 #endif
  45 #define FOOTERS 1           /* Need to enable footers so frees lock the right mspace */
  46 #undef DEBUG                            /* dlmalloc wants DEBUG either 0 or 1 */
  47 #ifdef _DEBUG
  48  #define DEBUG 1
  49 #else
  50  #define DEBUG 0
  51 #endif
  52 #ifdef NDEBUG               /* Disable assert checking on release builds */
  53  #undef DEBUG
  54 #endif
  55 /* The default of 64Kb means we spend too much time kernel-side */
  56 #ifndef DEFAULT_GRANULARITY
  57 #define DEFAULT_GRANULARITY (1*1024*1024)
  58 #endif
  59 /*#define USE_SPIN_LOCKS 0*/
  60
  61
  62 /*#define FORCEINLINE*/
  63 #include "malloc.c.h"
  64 #ifdef NDEBUG               /* Disable assert checking on release builds */
  65  #undef DEBUG
  66 #endif
  67
  68 /* The maximum concurrent threads in a pool possible */
  69 #ifndef MAXTHREADSINPOOL
  70 #define MAXTHREADSINPOOL 16
  71 #endif
  72 /* The maximum number of threadcaches which can be allocated */
  73 #ifndef THREADCACHEMAXCACHES
  74 #define THREADCACHEMAXCACHES 256
  75 #endif
  76 /* The maximum size to be allocated from the thread cache */
  77 #ifndef THREADCACHEMAX
  78 #define THREADCACHEMAX 8192
  79 #endif
  80 #if 0
  81 /* The number of cache entries for finer grained bins. This is (topbitpos(THREADCACHEMAX)-4)*2 */
  82 #define THREADCACHEMAXBINS ((13-4)*2)
  83 #else
  84 /* The number of cache entries. This is (topbitpos(THREADCACHEMAX)-4) */
  85 #define THREADCACHEMAXBINS (13-4)
  86 #endif
  87 /* Point at which the free space in a thread cache is garbage collected */
  88 #ifndef THREADCACHEMAXFREESPACE
  89 #define THREADCACHEMAXFREESPACE (512*1024)
  90 #endif
  91
  92
  93 #ifdef WIN32
  94  #define TLSVAR                 DWORD
  95  #define TLSALLOC(k)    (*(k)=TlsAlloc(), TLS_OUT_OF_INDEXES==*(k))
  96  #define TLSFREE(k)             (!TlsFree(k))
  97  #define TLSGET(k)              TlsGetValue(k)
  98  #define TLSSET(k, a)   (!TlsSetValue(k, a))
  99  #ifdef DEBUG
 100 static LPVOID ChkedTlsGetValue(DWORD idx)
 101 {
 102         LPVOID ret=TlsGetValue(idx);
 103         assert(S_OK==GetLastError());
 104         return ret;
 105 }
 106   #undef TLSGET
 107   #define TLSGET(k) ChkedTlsGetValue(k)
 108  #endif
 109 #else
 110  #define TLSVAR                 pthread_key_t
 111  #define TLSALLOC(k)    pthread_key_create(k, 0)
 112  #define TLSFREE(k)             pthread_key_delete(k)
 113  #define TLSGET(k)              pthread_getspecific(k)
 114  #define TLSSET(k, a)   pthread_setspecific(k, a)
 115 #endif
 116
 117 #if 0
 118 /* Only enable if testing with valgrind. Causes misoperation */
 119 #define mspace_malloc(p, s) malloc(s)
 120 #define mspace_realloc(p, m, s) realloc(m, s)
 121 #define mspace_calloc(p, n, s) calloc(n, s)
 122 #define mspace_free(p, m) free(m)
 123 #endif
 124
 125
 126 #if defined(__cplusplus)
 127 #if !defined(NO_NED_NAMESPACE)
 128 namespace nedalloc {
 129 #else
 130 extern "C" {
 131 #endif
 132 #endif
 133
 134 size_t nedblksize(void *mem) THROWSPEC
 135 {
 136 #if 0
 137         /* Only enable if testing with valgrind. Causes misoperation */
 138         return THREADCACHEMAX;
 139 #else
 140         if(mem)
 141         {
 142                 mchunkptr p=mem2chunk(mem);
 143                 assert(cinuse(p));      /* If this fails, someone tried to free a block twice */
 144                 if(cinuse(p))
 145                         return chunksize(p)-overhead_for(p);
 146         }
 147         return 0;
 148 #endif
 149 }
 150
 151 void nedsetvalue(void *v) THROWSPEC                                     { nedpsetvalue(0, v); }
 152 void * nedmalloc(size_t size) THROWSPEC                         { return nedpmalloc(0, size); }
 153 void * nedcalloc(size_t no, size_t size) THROWSPEC      { return nedpcalloc(0, no, size); }
 154 void * nedrealloc(void *mem, size_t size) THROWSPEC     { return nedprealloc(0, mem, size); }
 155 void   nedfree(void *mem) THROWSPEC                                     { nedpfree(0, mem); }
 156 void * nedmemalign(size_t alignment, size_t bytes) THROWSPEC { return nedpmemalign(0, alignment, bytes); }
 157 #if !NO_MALLINFO
 158 struct mallinfo nedmallinfo(void) THROWSPEC                     { return nedpmallinfo(0); }
 159 #endif
 160 int    nedmallopt(int parno, int value) THROWSPEC       { return nedpmallopt(0, parno, value); }
 161 int    nedmalloc_trim(size_t pad) THROWSPEC                     { return nedpmalloc_trim(0, pad); }
 162 void   nedmalloc_stats(void) THROWSPEC                                  { nedpmalloc_stats(0); }
 163 size_t nedmalloc_footprint(void) THROWSPEC                              { return nedpmalloc_footprint(0); }
 164 void **nedindependent_calloc(size_t elemsno, size_t elemsize, void **chunks) THROWSPEC  { return nedpindependent_calloc(0, elemsno, elemsize, chunks); }
 165 void **nedindependent_comalloc(size_t elems, size_t *sizes, void **chunks) THROWSPEC    { return nedpindependent_comalloc(0, elems, sizes, chunks); }
 166
 167 struct threadcacheblk_t;
 168 typedef struct threadcacheblk_t threadcacheblk;
 169 struct threadcacheblk_t
 170 {       /* Keep less than 16 bytes on 32 bit systems and 32 bytes on 64 bit systems */
 171 #ifdef FULLSANITYCHECKS
 172         unsigned int magic;
 173 #endif
 174         unsigned int lastUsed, size;
 175         threadcacheblk *next, *prev;
 176 };
 177 typedef struct threadcache_t
 178 {
 179 #ifdef FULLSANITYCHECKS
 180         unsigned int magic1;
 181 #endif
 182         int mymspace;                                           /* Last mspace entry this thread used */
 183         long threadid;
 184         unsigned int mallocs, frees, successes;
 185         size_t freeInCache;                                     /* How much free space is stored in this cache */
 186         threadcacheblk *bins[(THREADCACHEMAXBINS+1)*2];
 187 #ifdef FULLSANITYCHECKS
 188         unsigned int magic2;
 189 #endif
 190 } threadcache;
 191 struct nedpool_t
 192 {
 193         MLOCK_T mutex;
 194         void *uservalue;
 195         int threads;                                            /* Max entries in m to use */
 196         threadcache *caches[THREADCACHEMAXCACHES];
 197         TLSVAR mycache;                                         /* Thread cache for this thread. 0 for unset, negative for use mspace-1 directly, otherwise is cache-1 */
 198         mstate m[MAXTHREADSINPOOL+1];           /* mspace entries for this pool */
 199 };
 200 static nedpool syspool;
 201
 202 static FORCEINLINE unsigned int size2binidx(size_t _size) THROWSPEC
 203 {       /* 8=1000       16=10000        20=10100        24=11000        32=100000       48=110000       4096=1000000000000 */
 204         unsigned int topbit, size=(unsigned int)(_size>>4);
 205         /* 16=1         20=1    24=1    32=10   48=11   64=100  96=110  128=1000        4096=100000000 */
 206
 207 #if defined(__GNUC__)
 208         topbit = sizeof(size)*__CHAR_BIT__ - 1 - __builtin_clz(size);
 209 #elif defined(_MSC_VER) && _MSC_VER>=1300
 210         {
 211             unsigned long bsrTopBit;
 212
 213             _BitScanReverse(&bsrTopBit, size);
 214
 215             topbit = bsrTopBit;
 216         }
 217 #else
 218 #if 0
 219         union {
 220                 unsigned asInt[2];
 221                 double asDouble;
 222         };
 223         int n;
 224
 225         asDouble = (double)size + 0.5;
 226         topbit = (asInt[!FOX_BIGENDIAN] >> 20) - 1023;
 227 #else
 228         {
 229                 unsigned int x=size;
 230                 x = x | (x >> 1);
 231                 x = x | (x >> 2);
 232                 x = x | (x >> 4);
 233                 x = x | (x >> 8);
 234                 x = x | (x >>16);
 235                 x = ~x;
 236                 x = x - ((x >> 1) & 0x55555555);
 237                 x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
 238                 x = (x + (x >> 4)) & 0x0F0F0F0F;
 239                 x = x + (x << 8);
 240                 x = x + (x << 16);
 241                 topbit=31 - (x >> 24);
 242         }
 243 #endif
 244 #endif
 245         return topbit;
 246 }
 247
 248
 249 #ifdef FULLSANITYCHECKS
 250 static void tcsanitycheck(threadcacheblk **ptr) THROWSPEC
 251 {
 252         assert((ptr[0] && ptr[1]) || (!ptr[0] && !ptr[1]));
 253         if(ptr[0] && ptr[1])
 254         {
 255                 assert(nedblksize(ptr[0])>=sizeof(threadcacheblk));
 256                 assert(nedblksize(ptr[1])>=sizeof(threadcacheblk));
 257                 assert(*(unsigned int *) "NEDN"==ptr[0]->magic);
 258                 assert(*(unsigned int *) "NEDN"==ptr[1]->magic);
 259                 assert(!ptr[0]->prev);
 260                 assert(!ptr[1]->next);
 261                 if(ptr[0]==ptr[1])
 262                 {
 263                         assert(!ptr[0]->next);
 264                         assert(!ptr[1]->prev);
 265                 }
 266         }
 267 }
 268 static void tcfullsanitycheck(threadcache *tc) THROWSPEC
 269 {
 270         threadcacheblk **tcbptr=tc->bins;
 271         int n;
 272         for(n=0; n<=THREADCACHEMAXBINS; n++, tcbptr+=2)
 273         {
 274                 threadcacheblk *b, *ob=0;
 275                 tcsanitycheck(tcbptr);
 276                 for(b=tcbptr[0]; b; ob=b, b=b->next)
 277                 {
 278                         assert(*(unsigned int *) "NEDN"==b->magic);
 279                         assert(!ob || ob->next==b);
 280                         assert(!ob || b->prev==ob);
 281                 }
 282         }
 283 }
 284 #endif
 285
 286 static NOINLINE void RemoveCacheEntries(nedpool *p, threadcache *tc, unsigned int age) THROWSPEC
 287 {
 288 #ifdef FULLSANITYCHECKS
 289         tcfullsanitycheck(tc);
 290 #endif
 291         if(tc->freeInCache)
 292         {
 293                 threadcacheblk **tcbptr=tc->bins;
 294                 int n;
 295                 for(n=0; n<=THREADCACHEMAXBINS; n++, tcbptr+=2)
 296                 {
 297                         threadcacheblk **tcb=tcbptr+1;          /* come from oldest end of list */
 298                         /*tcsanitycheck(tcbptr);*/
 299                         for(; *tcb && tc->frees-(*tcb)->lastUsed>=age; )
 300                         {
 301                                 threadcacheblk *f=*tcb;
 302                                 size_t blksize=f->size; /*nedblksize(f);*/
 303                                 assert(blksize<=nedblksize(f));
 304                                 assert(blksize);
 305 #ifdef FULLSANITYCHECKS
 306                                 assert(*(unsigned int *) "NEDN"==(*tcb)->magic);
 307 #endif
 308                                 *tcb=(*tcb)->prev;
 309                                 if(*tcb)
 310                                         (*tcb)->next=0;
 311                                 else
 312                                         *tcbptr=0;
 313                                 tc->freeInCache-=blksize;
 314                                 assert((long) tc->freeInCache>=0);
 315                                 mspace_free(0, f);
 316                                 /*tcsanitycheck(tcbptr);*/
 317                         }
 318                 }
 319         }
 320 #ifdef FULLSANITYCHECKS
 321         tcfullsanitycheck(tc);
 322 #endif
 323 }
 324 static void DestroyCaches(nedpool *p) THROWSPEC
 325 {
 326         if(p->caches)
 327         {
 328                 threadcache *tc;
 329                 int n;
 330                 for(n=0; n<THREADCACHEMAXCACHES; n++)
 331                 {
 332                         if((tc=p->caches[n]))
 333                         {
 334                                 tc->frees++;
 335                                 RemoveCacheEntries(p, tc, 0);
 336                                 assert(!tc->freeInCache);
 337                                 tc->mymspace=-1;
 338                                 tc->threadid=0;
 339                                 mspace_free(0, tc);
 340                                 p->caches[n]=0;
 341                         }
 342                 }
 343         }
 344 }
 345
 346 static NOINLINE threadcache *AllocCache(nedpool *p) THROWSPEC
 347 {
 348         threadcache *tc=0;
 349         int n, end;
 350         ACQUIRE_LOCK(&p->mutex);
 351         for(n=0; n<THREADCACHEMAXCACHES && p->caches[n]; n++);
 352         if(THREADCACHEMAXCACHES==n)
 353         {       /* List exhausted, so disable for this thread */
 354                 RELEASE_LOCK(&p->mutex);
 355                 return 0;
 356         }
 357         tc=p->caches[n]=(threadcache *) mspace_calloc(p->m[0], 1, sizeof(threadcache));
 358         if(!tc)
 359         {
 360                 RELEASE_LOCK(&p->mutex);
 361                 return 0;
 362         }
 363 #ifdef FULLSANITYCHECKS
 364         tc->magic1=*(unsigned int *)"NEDMALC1";
 365         tc->magic2=*(unsigned int *)"NEDMALC2";
 366 #endif
 367         tc->threadid=(long)(size_t)CURRENT_THREAD;
 368         for(end=0; p->m[end]; end++);
 369         tc->mymspace=tc->threadid % end;
 370         RELEASE_LOCK(&p->mutex);
 371         if(TLSSET(p->mycache, (void *)(size_t)(n+1))) abort();
 372         return tc;
 373 }
 374
 375 static void *threadcache_malloc(nedpool *p, threadcache *tc, size_t *size) THROWSPEC
 376 {
 377         void *ret=0;
 378         unsigned int bestsize;
 379         unsigned int idx=size2binidx(*size);
 380         size_t blksize=0;
 381         threadcacheblk *blk, **binsptr;
 382 #ifdef FULLSANITYCHECKS
 383         tcfullsanitycheck(tc);
 384 #endif
 385         /* Calculate best fit bin size */
 386         bestsize=1<<(idx+4);
 387 #if 0
 388         /* Finer grained bin fit */
 389         idx<<=1;
 390         if(*size>bestsize)
 391         {
 392                 idx++;
 393                 bestsize+=bestsize>>1;
 394         }
 395         if(*size>bestsize)
 396         {
 397                 idx++;
 398                 bestsize=1<<(4+(idx>>1));
 399         }
 400 #else
 401         if(*size>bestsize)
 402         {
 403                 idx++;
 404                 bestsize<<=1;
 405         }
 406 #endif
 407         assert(bestsize>=*size);
 408         if(*size<bestsize) *size=bestsize;
 409         assert(*size<=THREADCACHEMAX);
 410         assert(idx<=THREADCACHEMAXBINS);
 411         binsptr=&tc->bins[idx*2];
 412         /* Try to match close, but move up a bin if necessary */
 413         blk=*binsptr;
 414         if(!blk || blk->size<*size)
 415         {       /* Bump it up a bin */
 416                 if(idx<THREADCACHEMAXBINS)
 417                 {
 418                         idx++;
 419                         binsptr+=2;
 420                         blk=*binsptr;
 421                 }
 422         }
 423         if(blk)
 424         {
 425                 blksize=blk->size; /*nedblksize(blk);*/
 426                 assert(nedblksize(blk)>=blksize);
 427                 assert(blksize>=*size);
 428                 if(blk->next)
 429                         blk->next->prev=0;
 430                 *binsptr=blk->next;
 431                 if(!*binsptr)
 432                         binsptr[1]=0;
 433 #ifdef FULLSANITYCHECKS
 434                 blk->magic=0;
 435 #endif
 436                 assert(binsptr[0]!=blk && binsptr[1]!=blk);
 437                 assert(nedblksize(blk)>=sizeof(threadcacheblk) && nedblksize(blk)<=THREADCACHEMAX+CHUNK_OVERHEAD);
 438                 /*printf("malloc: %p, %p, %p, %lu\n", p, tc, blk, (long) size);*/
 439                 ret=(void *) blk;
 440         }
 441         ++tc->mallocs;
 442         if(ret)
 443         {
 444                 assert(blksize>=*size);
 445                 ++tc->successes;
 446                 tc->freeInCache-=blksize;
 447                 assert((long) tc->freeInCache>=0);
 448         }
 449 #if defined(DEBUG) && 0
 450         if(!(tc->mallocs & 0xfff))
 451         {
 452                 printf("*** threadcache=%u, mallocs=%u (%f), free=%u (%f), freeInCache=%u\n", (unsigned int) tc->threadid, tc->mallocs,
 453                         (float) tc->successes/tc->mallocs, tc->frees, (float) tc->successes/tc->frees, (unsigned int) tc->freeInCache);
 454         }
 455 #endif
 456 #ifdef FULLSANITYCHECKS
 457         tcfullsanitycheck(tc);
 458 #endif
 459         return ret;
 460 }
 461 static NOINLINE void ReleaseFreeInCache(nedpool *p, threadcache *tc, int mymspace) THROWSPEC
 462 {
 463         unsigned int age=THREADCACHEMAXFREESPACE/8192;
 464         /*ACQUIRE_LOCK(&p->m[mymspace]->mutex);*/
 465         while(age && tc->freeInCache>=THREADCACHEMAXFREESPACE)
 466         {
 467                 RemoveCacheEntries(p, tc, age);
 468                 /*printf("*** Removing cache entries older than %u (%u)\n", age, (unsigned int) tc->freeInCache);*/
 469                 age>>=1;
 470         }
 471         /*RELEASE_LOCK(&p->m[mymspace]->mutex);*/
 472 }
 473 static void threadcache_free(nedpool *p, threadcache *tc, int mymspace, void *mem, size_t size) THROWSPEC
 474 {
 475         unsigned int bestsize;
 476         unsigned int idx=size2binidx(size);
 477         threadcacheblk **binsptr, *tck=(threadcacheblk *) mem;
 478         assert(size>=sizeof(threadcacheblk) && size<=THREADCACHEMAX+CHUNK_OVERHEAD);
 479 #ifdef DEBUG
 480         {       /* Make sure this is a valid memory block */
 481             mchunkptr p  = mem2chunk(mem);
 482             mstate fm = get_mstate_for(p);
 483             if (!ok_magic(fm)) {
 484               USAGE_ERROR_ACTION(fm, p);
 485               return;
 486             }
 487         }
 488 #endif
 489 #ifdef FULLSANITYCHECKS
 490         tcfullsanitycheck(tc);
 491 #endif
 492         /* Calculate best fit bin size */
 493         bestsize=1<<(idx+4);
 494 #if 0
 495         /* Finer grained bin fit */
 496         idx<<=1;
 497         if(size>bestsize)
 498         {
 499                 unsigned int biggerbestsize=bestsize+bestsize<<1;
 500                 if(size>=biggerbestsize)
 501                 {
 502                         idx++;
 503                         bestsize=biggerbestsize;
 504                 }
 505         }
 506 #endif
 507         if(bestsize!=size)      /* dlmalloc can round up, so we round down to preserve indexing */
 508                 size=bestsize;
 509         binsptr=&tc->bins[idx*2];
 510         assert(idx<=THREADCACHEMAXBINS);
 511         if(tck==*binsptr)
 512         {
 513                 fprintf(stderr, "Attempt to free already freed memory block %p - aborting!\n", tck);
 514                 abort();
 515         }
 516 #ifdef FULLSANITYCHECKS
 517         tck->magic=*(unsigned int *) "NEDN";
 518 #endif
 519         tck->lastUsed=++tc->frees;
 520         tck->size=(unsigned int) size;
 521         tck->next=*binsptr;
 522         tck->prev=0;
 523         if(tck->next)
 524                 tck->next->prev=tck;
 525         else
 526                 binsptr[1]=tck;
 527         assert(!*binsptr || (*binsptr)->size==tck->size);
 528         *binsptr=tck;
 529         assert(tck==tc->bins[idx*2]);
 530         assert(tc->bins[idx*2+1]==tck || binsptr[0]->next->prev==tck);
 531         /*printf("free: %p, %p, %p, %lu\n", p, tc, mem, (long) size);*/
 532         tc->freeInCache+=size;
 533 #ifdef FULLSANITYCHECKS
 534         tcfullsanitycheck(tc);
 535 #endif
 536 #if 1
 537         if(tc->freeInCache>=THREADCACHEMAXFREESPACE)
 538                 ReleaseFreeInCache(p, tc, mymspace);
 539 #endif
 540 }
 541
 542
 543
 544
 545 static NOINLINE int InitPool(nedpool *p, size_t capacity, int threads) THROWSPEC
 546 {       /* threads is -1 for system pool */
 547         ensure_initialization();
 548         ACQUIRE_MALLOC_GLOBAL_LOCK();
 549         if(p->threads) goto done;
 550         if(INITIAL_LOCK(&p->mutex)) goto err;
 551         if(TLSALLOC(&p->mycache)) goto err;
 552         if(!(p->m[0]=(mstate) create_mspace(capacity, 1))) goto err;
 553         p->m[0]->extp=p;
 554         p->threads=(threads<1 || threads>MAXTHREADSINPOOL) ? MAXTHREADSINPOOL : threads;
 555 done:
 556         RELEASE_MALLOC_GLOBAL_LOCK();
 557         return 1;
 558 err:
 559         if(threads<0)
 560                 abort();                        /* If you can't allocate for system pool, we're screwed */
 561         DestroyCaches(p);
 562         if(p->m[0])
 563         {
 564                 destroy_mspace(p->m[0]);
 565                 p->m[0]=0;
 566         }
 567         if(p->mycache)
 568         {
 569                 if(TLSFREE(p->mycache)) abort();
 570                 p->mycache=0;
 571         }
 572         RELEASE_MALLOC_GLOBAL_LOCK();
 573         return 0;
 574 }
 575 static NOINLINE mstate FindMSpace(nedpool *p, threadcache *tc, int *lastUsed, size_t size) THROWSPEC
 576 {       /* Gets called when thread's last used mspace is in use. The strategy
 577         is to run through the list of all available mspaces looking for an
 578         unlocked one and if we fail, we create a new one so long as we don't
 579         exceed p->threads */
 580         int n, end;
 581         for(n=end=*lastUsed+1; p->m[n]; end=++n)
 582         {
 583                 if(TRY_LOCK(&p->m[n]->mutex)) goto found;
 584         }
 585         for(n=0; n<*lastUsed && p->m[n]; n++)
 586         {
 587                 if(TRY_LOCK(&p->m[n]->mutex)) goto found;
 588         }
 589         if(end<p->threads)
 590         {
 591                 mstate temp;
 592                 if(!(temp=(mstate) create_mspace(size, 1)))
 593                         goto badexit;
 594                 /* Now we're ready to modify the lists, we lock */
 595                 ACQUIRE_LOCK(&p->mutex);
 596                 while(p->m[end] && end<p->threads)
 597                         end++;
 598                 if(end>=p->threads)
 599                 {       /* Drat, must destroy it now */
 600                         RELEASE_LOCK(&p->mutex);
 601                         destroy_mspace((mspace) temp);
 602                         goto badexit;
 603                 }
 604                 /* We really want to make sure this goes into memory now but we
 605                 have to be careful of breaking aliasing rules, so write it twice */
 606                 {
 607                         volatile struct malloc_state **_m=(volatile struct malloc_state **) &p->m[end];
 608                         *_m=(p->m[end]=temp);
 609                 }
 610                 ACQUIRE_LOCK(&p->m[end]->mutex);
 611                 /*printf("Created mspace idx %d\n", end);*/
 612                 RELEASE_LOCK(&p->mutex);
 613                 n=end;
 614                 goto found;
 615         }
 616         /* Let it lock on the last one it used */
 617 badexit:
 618         ACQUIRE_LOCK(&p->m[*lastUsed]->mutex);
 619         return p->m[*lastUsed];
 620 found:
 621         *lastUsed=n;
 622         if(tc)
 623                 tc->mymspace=n;
 624         else
 625         {
 626                 if(TLSSET(p->mycache, (void *)(size_t)(-(n+1)))) abort();
 627         }
 628         return p->m[n];
 629 }
 630
 631 nedpool *nedcreatepool(size_t capacity, int threads) THROWSPEC
 632 {
 633         nedpool *ret;
 634         if(!(ret=(nedpool *) nedpcalloc(0, 1, sizeof(nedpool)))) return 0;
 635         if(!InitPool(ret, capacity, threads))
 636         {
 637                 nedpfree(0, ret);
 638                 return 0;
 639         }
 640         return ret;
 641 }
 642 void neddestroypool(nedpool *p) THROWSPEC
 643 {
 644         int n;
 645         ACQUIRE_LOCK(&p->mutex);
 646         DestroyCaches(p);
 647         for(n=0; p->m[n]; n++)
 648         {
 649                 destroy_mspace(p->m[n]);
 650                 p->m[n]=0;
 651         }
 652         RELEASE_LOCK(&p->mutex);
 653         if(TLSFREE(p->mycache)) abort();
 654         nedpfree(0, p);
 655 }
 656
 657 void nedpsetvalue(nedpool *p, void *v) THROWSPEC
 658 {
 659         if(!p) { p=&syspool; if(!syspool.threads) InitPool(&syspool, 0, -1); }
 660         p->uservalue=v;
 661 }
 662 void *nedgetvalue(nedpool **p, void *mem) THROWSPEC
 663 {
 664         nedpool *np=0;
 665         mchunkptr mcp=mem2chunk(mem);
 666         mstate fm;
 667         if(!(is_aligned(chunk2mem(mcp))) && mcp->head != FENCEPOST_HEAD) return 0;
 668         if(!cinuse(mcp)) return 0;
 669         if(!next_pinuse(mcp)) return 0;
 670         if(!is_mmapped(mcp) && !pinuse(mcp))
 671         {
 672                 if(next_chunk(prev_chunk(mcp))!=mcp) return 0;
 673         }
 674         fm=get_mstate_for(mcp);
 675         if(!ok_magic(fm)) return 0;
 676         if(!ok_address(fm, mcp)) return 0;
 677         if(!fm->extp) return 0;
 678         np=(nedpool *) fm->extp;
 679         if(p) *p=np;
 680         return np->uservalue;
 681 }
 682
 683 void neddisablethreadcache(nedpool *p) THROWSPEC
 684 {
 685         int mycache;
 686         if(!p)
 687         {
 688                 p=&syspool;
 689                 if(!syspool.threads) InitPool(&syspool, 0, -1);
 690         }
 691         mycache=(int)(size_t) TLSGET(p->mycache);
 692         if(!mycache)
 693         {       /* Set to mspace 0 */
 694                 if(TLSSET(p->mycache, (void *)-1)) abort();
 695         }
 696         else if(mycache>0)
 697         {       /* Set to last used mspace */
 698                 threadcache *tc=p->caches[mycache-1];
 699 #if defined(DEBUG)
 700                 printf("Threadcache utilisation: %lf%% in cache with %lf%% lost to other threads\n",
 701                         100.0*tc->successes/tc->mallocs, 100.0*((double) tc->mallocs-tc->frees)/tc->mallocs);
 702 #endif
 703                 if(TLSSET(p->mycache, (void *)(size_t)(-tc->mymspace))) abort();
 704                 tc->frees++;
 705                 RemoveCacheEntries(p, tc, 0);
 706                 assert(!tc->freeInCache);
 707                 tc->mymspace=-1;
 708                 tc->threadid=0;
 709                 mspace_free(0, p->caches[mycache-1]);
 710                 p->caches[mycache-1]=0;
 711         }
 712 }
 713
 714 #define GETMSPACE(m,p,tc,ms,s,action)           \
 715   do                                            \
 716   {                                             \
 717     mstate m = GetMSpace((p),(tc),(ms),(s));    \
 718     action;                                     \
 719     RELEASE_LOCK(&m->mutex);                    \
 720   } while (0)
 721
 722 static FORCEINLINE mstate GetMSpace(nedpool *p, threadcache *tc, int mymspace, size_t size) THROWSPEC
 723 {       /* Returns a locked and ready for use mspace */
 724         mstate m=p->m[mymspace];
 725         assert(m);
 726         if(!TRY_LOCK(&p->m[mymspace]->mutex)) m=FindMSpace(p, tc, &mymspace, size);\
 727         /*assert(IS_LOCKED(&p->m[mymspace]->mutex));*/
 728         return m;
 729 }
 730 static FORCEINLINE void GetThreadCache(nedpool **p, threadcache **tc, int *mymspace, size_t *size) THROWSPEC
 731 {
 732         int mycache;
 733         if(size && *size<sizeof(threadcacheblk)) *size=sizeof(threadcacheblk);
 734         if(!*p)
 735         {
 736                 *p=&syspool;
 737                 if(!syspool.threads) InitPool(&syspool, 0, -1);
 738         }
 739         mycache=(int)(size_t) TLSGET((*p)->mycache);
 740         if(mycache>0)
 741         {
 742                 *tc=(*p)->caches[mycache-1];
 743                 *mymspace=(*tc)->mymspace;
 744         }
 745         else if(!mycache)
 746         {
 747                 *tc=AllocCache(*p);
 748                 if(!*tc)
 749                 {       /* Disable */
 750                         if(TLSSET((*p)->mycache, (void *)-1)) abort();
 751                         *mymspace=0;
 752                 }
 753                 else
 754                         *mymspace=(*tc)->mymspace;
 755         }
 756         else
 757         {
 758                 *tc=0;
 759                 *mymspace=-mycache-1;
 760         }
 761         assert(*mymspace>=0);
 762         assert((long)(size_t)CURRENT_THREAD==(*tc)->threadid);
 763 #ifdef FULLSANITYCHECKS
 764         if(*tc)
 765         {
 766                 if(*(unsigned int *)"NEDMALC1"!=(*tc)->magic1 || *(unsigned int *)"NEDMALC2"!=(*tc)->magic2)
 767                 {
 768                         abort();
 769                 }
 770         }
 771 #endif
 772 }
 773
 774 void * nedpmalloc(nedpool *p, size_t size) THROWSPEC
 775 {
 776         void *ret=0;
 777         threadcache *tc;
 778         int mymspace;
 779         GetThreadCache(&p, &tc, &mymspace, &size);
 780 #if THREADCACHEMAX
 781         if(tc && size<=THREADCACHEMAX)
 782         {       /* Use the thread cache */
 783                 ret=threadcache_malloc(p, tc, &size);
 784         }
 785 #endif
 786         if(!ret)
 787         {       /* Use this thread's mspace */
 788         GETMSPACE(m, p, tc, mymspace, size,
 789                   ret=mspace_malloc(m, size));
 790         }
 791         return ret;
 792 }
 793 void * nedpcalloc(nedpool *p, size_t no, size_t size) THROWSPEC
 794 {
 795         size_t rsize=size*no;
 796         void *ret=0;
 797         threadcache *tc;
 798         int mymspace;
 799         GetThreadCache(&p, &tc, &mymspace, &rsize);
 800 #if THREADCACHEMAX
 801         if(tc && rsize<=THREADCACHEMAX)
 802         {       /* Use the thread cache */
 803                 if((ret=threadcache_malloc(p, tc, &rsize)))
 804                         memset(ret, 0, rsize);
 805         }
 806 #endif
 807         if(!ret)
 808         {       /* Use this thread's mspace */
 809         GETMSPACE(m, p, tc, mymspace, rsize,
 810                   ret=mspace_calloc(m, 1, rsize));
 811         }
 812         return ret;
 813 }
 814 void * nedprealloc(nedpool *p, void *mem, size_t size) THROWSPEC
 815 {
 816         void *ret=0;
 817         threadcache *tc;
 818         int mymspace;
 819         if(!mem) return nedpmalloc(p, size);
 820         GetThreadCache(&p, &tc, &mymspace, &size);
 821 #if THREADCACHEMAX
 822         if(tc && size && size<=THREADCACHEMAX)
 823         {       /* Use the thread cache */
 824                 size_t memsize=nedblksize(mem);
 825                 assert(memsize);
 826                 if((ret=threadcache_malloc(p, tc, &size)))
 827                 {
 828                         memcpy(ret, mem, memsize<size ? memsize : size);
 829                         if(memsize<=THREADCACHEMAX)
 830                                 threadcache_free(p, tc, mymspace, mem, memsize);
 831                         else
 832                                 mspace_free(0, mem);
 833                 }
 834         }
 835 #endif
 836         if(!ret)
 837         {       /* Reallocs always happen in the mspace they happened in, so skip
 838                 locking the preferred mspace for this thread */
 839                 ret=mspace_realloc(0, mem, size);
 840         }
 841         return ret;
 842 }
 843 void   nedpfree(nedpool *p, void *mem) THROWSPEC
 844 {       /* Frees always happen in the mspace they happened in, so skip
 845         locking the preferred mspace for this thread */
 846         threadcache *tc;
 847         int mymspace;
 848         size_t memsize;
 849         assert(mem);
 850         GetThreadCache(&p, &tc, &mymspace, 0);
 851 #if THREADCACHEMAX
 852         memsize=nedblksize(mem);
 853         assert(memsize);
 854         if(mem && tc && memsize<=(THREADCACHEMAX+CHUNK_OVERHEAD))
 855                 threadcache_free(p, tc, mymspace, mem, memsize);
 856         else
 857 #endif
 858                 mspace_free(0, mem);
 859 }
 860 void * nedpmemalign(nedpool *p, size_t alignment, size_t bytes) THROWSPEC
 861 {
 862         void *ret;
 863         threadcache *tc;
 864         int mymspace;
 865         GetThreadCache(&p, &tc, &mymspace, &bytes);
 866         {       /* Use this thread's mspace */
 867         GETMSPACE(m, p, tc, mymspace, bytes,
 868                   ret=mspace_memalign(m, alignment, bytes));
 869         }
 870         return ret;
 871 }
 872 #if !NO_MALLINFO
 873 struct mallinfo nedpmallinfo(nedpool *p) THROWSPEC
 874 {
 875         int n;
 876         struct mallinfo ret={0};
 877         if(!p) { p=&syspool; if(!syspool.threads) InitPool(&syspool, 0, -1); }
 878         for(n=0; p->m[n]; n++)
 879         {
 880                 struct mallinfo t=mspace_mallinfo(p->m[n]);
 881                 ret.arena+=t.arena;
 882                 ret.ordblks+=t.ordblks;
 883                 ret.hblkhd+=t.hblkhd;
 884                 ret.usmblks+=t.usmblks;
 885                 ret.uordblks+=t.uordblks;
 886                 ret.fordblks+=t.fordblks;
 887                 ret.keepcost+=t.keepcost;
 888         }
 889         return ret;
 890 }
 891 #endif
 892 int    nedpmallopt(nedpool *p, int parno, int value) THROWSPEC
 893 {
 894         return mspace_mallopt(parno, value);
 895 }
 896 int    nedpmalloc_trim(nedpool *p, size_t pad) THROWSPEC
 897 {
 898         int n, ret=0;
 899         if(!p) { p=&syspool; if(!syspool.threads) InitPool(&syspool, 0, -1); }
 900         for(n=0; p->m[n]; n++)
 901         {
 902                 ret+=mspace_trim(p->m[n], pad);
 903         }
 904         return ret;
 905 }
 906 void   nedpmalloc_stats(nedpool *p) THROWSPEC
 907 {
 908         int n;
 909         if(!p) { p=&syspool; if(!syspool.threads) InitPool(&syspool, 0, -1); }
 910         for(n=0; p->m[n]; n++)
 911         {
 912                 mspace_malloc_stats(p->m[n]);
 913         }
 914 }
 915 size_t nedpmalloc_footprint(nedpool *p) THROWSPEC
 916 {
 917         size_t ret=0;
 918         int n;
 919         if(!p) { p=&syspool; if(!syspool.threads) InitPool(&syspool, 0, -1); }
 920         for(n=0; p->m[n]; n++)
 921         {
 922                 ret+=mspace_footprint(p->m[n]);
 923         }
 924         return ret;
 925 }
 926 void **nedpindependent_calloc(nedpool *p, size_t elemsno, size_t elemsize, void **chunks) THROWSPEC
 927 {
 928         void **ret;
 929         threadcache *tc;
 930         int mymspace;
 931         GetThreadCache(&p, &tc, &mymspace, &elemsize);
 932     GETMSPACE(m, p, tc, mymspace, elemsno*elemsize,
 933               ret=mspace_independent_calloc(m, elemsno, elemsize, chunks));
 934         return ret;
 935 }
 936 void **nedpindependent_comalloc(nedpool *p, size_t elems, size_t *sizes, void **chunks) THROWSPEC
 937 {
 938         void **ret;
 939         threadcache *tc;
 940         int mymspace;
 941     size_t i, *adjustedsizes=(size_t *) alloca(elems*sizeof(size_t));
 942     if(!adjustedsizes) return 0;
 943     for(i=0; i<elems; i++)
 944         adjustedsizes[i]=sizes[i]<sizeof(threadcacheblk) ? sizeof(threadcacheblk) : sizes[i];
 945         GetThreadCache(&p, &tc, &mymspace, 0);
 946         GETMSPACE(m, p, tc, mymspace, 0,
 947               ret=mspace_independent_comalloc(m, elems, adjustedsizes, chunks));
 948         return ret;
 949 }
 950
 951 #ifdef OVERRIDE_STRDUP
 952 /*
 953  * This implementation is purely there to override the libc version, to
 954  * avoid a crash due to allocation and free on different 'heaps'.
 955  */
 956 char *strdup(const char *s1)
 957 {
 958         char *s2 = 0;
 959         if (s1) {
 960                 s2 = malloc(strlen(s1) + 1);
 961                 strcpy(s2, s1);
 962         }
 963         return s2;
 964 }
 965 #endif
 966
 967 #if defined(__cplusplus)
 968 }
 969 #endif