Alc/helpers.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 2011 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  *  Boston, MA  02111-1307, USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #if defined(HAVE_GUIDDEF_H) || defined(HAVE_INITGUID_H)
  24 #define INITGUID
  25 #include <windows.h>
  26 #ifdef HAVE_GUIDDEF_H
  27 #include <guiddef.h>
  28 #else
  29 #include <initguid.h>
  30 #endif
  31
  32 DEFINE_GUID(KSDATAFORMAT_SUBTYPE_PCM,        0x00000001, 0x0000, 0x0010, 0x80,0x00, 0x00,0xaa,0x00,0x38,0x9b,0x71);
  33 DEFINE_GUID(KSDATAFORMAT_SUBTYPE_IEEE_FLOAT, 0x00000003, 0x0000, 0x0010, 0x80,0x00, 0x00,0xaa,0x00,0x38,0x9b,0x71);
  34
  35 DEFINE_GUID(IID_IDirectSoundNotify,   0xb0210783, 0x89cd, 0x11d0, 0xaf,0x08, 0x00,0xa0,0xc9,0x25,0xcd,0x16);
  36
  37 DEFINE_GUID(CLSID_MMDeviceEnumerator, 0xbcde0395, 0xe52f, 0x467c, 0x8e,0x3d, 0xc4,0x57,0x92,0x91,0x69,0x2e);
  38 DEFINE_GUID(IID_IMMDeviceEnumerator,  0xa95664d2, 0x9614, 0x4f35, 0xa7,0x46, 0xde,0x8d,0xb6,0x36,0x17,0xe6);
  39 DEFINE_GUID(IID_IAudioClient,         0x1cb9ad4c, 0xdbfa, 0x4c32, 0xb1,0x78, 0xc2,0xf5,0x68,0xa7,0x03,0xb2);
  40 DEFINE_GUID(IID_IAudioRenderClient,   0xf294acfc, 0x3146, 0x4483, 0xa7,0xbf, 0xad,0xdc,0xa7,0xc2,0x60,0xe2);
  41
  42 #ifdef HAVE_MMDEVAPI
  43 #include <devpropdef.h>
  44
  45 DEFINE_DEVPROPKEY(DEVPKEY_Device_FriendlyName, 0xa45c254e, 0xdf1c, 0x4efd, 0x80,0x20, 0x67,0xd1,0x46,0xa8,0x50,0xe0, 14);
  46 #endif
  47
  48 #endif
  49
  50 #include <stdlib.h>
  51 #include <time.h>
  52 #include <errno.h>
  53 #include <stdarg.h>
  54 #ifdef HAVE_DLFCN_H
  55 #include <dlfcn.h>
  56 #endif
  57 #ifdef HAVE_CPUID_H
  58 #include <cpuid.h>
  59 #endif
  60 #ifdef HAVE_FLOAT_H
  61 #include <float.h>
  62 #endif
  63 #ifdef HAVE_IEEEFP_H
  64 #include <ieeefp.h>
  65 #endif
  66
  67 #include "alMain.h"
  68
  69 ALuint CPUCapFlags = 0;
  70
  71
  72 void FillCPUCaps(ALuint capfilter)
  73 {
  74     ALuint caps = 0;
  75
  76 #if defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64)
  77 /* FIXME: We really should get this for all available CPUs in case different
  78  * CPUs have different caps (is that possible on one machine?). */
  79 #ifdef HAVE_CPUID_H
  80     union {
  81         unsigned int regs[4];
  82         char str[sizeof(unsigned int[4])];
  83     } cpuinf[3];
  84
  85     if(!__get_cpuid(0, &cpuinf[0].regs[0], &cpuinf[0].regs[1], &cpuinf[0].regs[2], &cpuinf[0].regs[3]))
  86         ERR("Failed to get CPUID\n");
  87     else
  88     {
  89         unsigned int maxfunc = cpuinf[0].regs[0];
  90         unsigned int maxextfunc = 0;
  91
  92         if(__get_cpuid(0x80000000, &cpuinf[0].regs[0], &cpuinf[0].regs[1], &cpuinf[0].regs[2], &cpuinf[0].regs[3]))
  93             maxextfunc = cpuinf[0].regs[0];
  94         TRACE("Detected max CPUID function: 0x%x (ext. 0x%x)\n", maxfunc, maxextfunc);
  95
  96         TRACE("Vendor ID: \"%.4s%.4s%.4s\"\n", cpuinf[0].str+4, cpuinf[0].str+12, cpuinf[0].str+8);
  97         if(maxextfunc >= 0x80000004 &&
  98            __get_cpuid(0x80000002, &cpuinf[0].regs[0], &cpuinf[0].regs[1], &cpuinf[0].regs[2], &cpuinf[0].regs[3]) &&
  99            __get_cpuid(0x80000003, &cpuinf[1].regs[0], &cpuinf[1].regs[1], &cpuinf[1].regs[2], &cpuinf[1].regs[3]) &&
 100            __get_cpuid(0x80000004, &cpuinf[2].regs[0], &cpuinf[2].regs[1], &cpuinf[2].regs[2], &cpuinf[2].regs[3]))
 101             TRACE("Name: \"%.16s%.16s%.16s\"\n", cpuinf[0].str, cpuinf[1].str, cpuinf[2].str);
 102
 103         if(maxfunc >= 1 &&
 104            __get_cpuid(1, &cpuinf[0].regs[0], &cpuinf[0].regs[1], &cpuinf[0].regs[2], &cpuinf[0].regs[3]))
 105         {
 106 #ifdef bit_SSE
 107             if((cpuinf[0].regs[3]&bit_SSE))
 108                 caps |= CPU_CAP_SSE;
 109 #endif
 110         }
 111     }
 112 #elif defined(HAVE_WINDOWS_H)
 113     HMODULE k32 = GetModuleHandleA("kernel32.dll");
 114     BOOL (WINAPI*IsProcessorFeaturePresent)(DWORD ProcessorFeature);
 115     IsProcessorFeaturePresent = (BOOL(WINAPI*)(DWORD))GetProcAddress(k32, "IsProcessorFeaturePresent");
 116     if(!IsProcessorFeaturePresent)
 117         ERR("IsProcessorFeaturePresent not available; CPU caps not detected\n");
 118     else
 119     {
 120         if(IsProcessorFeaturePresent(PF_XMMI_INSTRUCTIONS_AVAILABLE))
 121             caps |= CPU_CAP_SSE;
 122     }
 123 #endif
 124 #endif
 125 #ifdef HAVE_NEON
 126     /* Assume Neon support if compiled with it */
 127     caps |= CPU_CAP_NEON;
 128 #endif
 129
 130     TRACE("Got caps:%s%s%s\n", ((caps&CPU_CAP_SSE)?((capfilter&CPU_CAP_SSE)?" SSE":" (SSE)"):""),
 131                                ((caps&CPU_CAP_NEON)?((capfilter&CPU_CAP_NEON)?" Neon":" (Neon)"):""),
 132                                ((!caps)?" -none-":""));
 133     CPUCapFlags = caps & capfilter;
 134 }
 135
 136
 137 void *al_malloc(size_t alignment, size_t size)
 138 {
 139 #if defined(HAVE_ALIGNED_ALLOC)
 140     size = (size+(alignment-1))&~(alignment-1);
 141     return aligned_alloc(alignment, size);
 142 #elif defined(HAVE_POSIX_MEMALIGN)
 143     void *ret;
 144     if(posix_memalign(&ret, alignment, size) == 0)
 145         return ret;
 146     return NULL;
 147 #elif defined(HAVE__ALIGNED_MALLOC)
 148     return _aligned_malloc(size, alignment);
 149 #else
 150     char *ret = malloc(size+alignment);
 151     if(ret != NULL)
 152     {
 153         *(ret++) = 0x00;
 154         while(((ALintptrEXT)ret&(alignment-1)) != 0)
 155             *(ret++) = 0x55;
 156     }
 157     return ret;
 158 #endif
 159 }
 160
 161 void *al_calloc(size_t alignment, size_t size)
 162 {
 163     void *ret = al_malloc(alignment, size);
 164     if(ret) memset(ret, 0, size);
 165     return ret;
 166 }
 167
 168 void al_free(void *ptr)
 169 {
 170 #if defined(HAVE_ALIGNED_ALLOC) || defined(HAVE_POSIX_MEMALIGN)
 171     free(ptr);
 172 #elif defined(HAVE__ALIGNED_MALLOC)
 173     _aligned_free(ptr);
 174 #else
 175     if(ptr != NULL)
 176     {
 177         char *finder = ptr;
 178         do {
 179             --finder;
 180         } while(*finder == 0x55);
 181         free(finder);
 182     }
 183 #endif
 184 }
 185
 186
 187 #if (defined(HAVE___CONTROL87_2) || defined(HAVE__CONTROLFP)) && (defined(__x86_64__) || defined(_M_X64))
 188 /* Win64 doesn't allow us to set the precision control. */
 189 #undef _MCW_PC
 190 #define _MCW_PC 0
 191 #endif
 192
 193 void SetMixerFPUMode(FPUCtl *ctl)
 194 {
 195 #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
 196     unsigned short fpuState;
 197     __asm__ __volatile__("fnstcw %0" : "=m" (*&fpuState));
 198     ctl->state = fpuState;
 199     fpuState &= ~0x300; /* clear precision to single */
 200     fpuState |=  0xC00; /* set round-to-zero */
 201     __asm__ __volatile__("fldcw %0" : : "m" (*&fpuState));
 202 #ifdef HAVE_SSE
 203     if((CPUCapFlags&CPU_CAP_SSE))
 204     {
 205         int sseState;
 206         __asm__ __volatile__("stmxcsr %0" : "=m" (*&sseState));
 207         ctl->sse_state = sseState;
 208         sseState |= 0x0C00; /* set round-to-zero */
 209         sseState |= 0x8000; /* set flush-to-zero */
 210         __asm__ __volatile__("ldmxcsr %0" : : "m" (*&sseState));
 211     }
 212 #endif
 213 #elif defined(HAVE___CONTROL87_2)
 214     int mode;
 215     __control87_2(0, 0, &ctl->state, &ctl->sse_state);
 216     __control87_2(_RC_CHOP|_PC_24, _MCW_RC|_MCW_PC, &mode, NULL);
 217 #ifdef HAVE_SSE
 218     if((CPUCapFlags&CPU_CAP_SSE))
 219         __control87_2(_RC_CHOP|_DN_FLUSH, _MCW_RC|_MCW_DN, NULL, &mode);
 220 #endif
 221 #elif defined(HAVE__CONTROLFP)
 222     ctl->state = _controlfp(0, 0);
 223     (void)_controlfp(_RC_CHOP|_PC_24, _MCW_RC|_MCW_PC);
 224 #elif defined(HAVE_FESETROUND)
 225     ctl->state = fegetround();
 226 #ifdef FE_TOWARDZERO
 227     fesetround(FE_TOWARDZERO);
 228 #endif
 229 #endif
 230 }
 231
 232 void RestoreFPUMode(const FPUCtl *ctl)
 233 {
 234 #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
 235     unsigned short fpuState = ctl->state;
 236     __asm__ __volatile__("fldcw %0" : : "m" (*&fpuState));
 237 #ifdef HAVE_SSE
 238     if((CPUCapFlags&CPU_CAP_SSE))
 239         __asm__ __volatile__("ldmxcsr %0" : : "m" (*&ctl->sse_state));
 240 #endif
 241 #elif defined(HAVE___CONTROL87_2)
 242     int mode;
 243     __control87_2(ctl->state, _MCW_RC|_MCW_PC, &mode, NULL);
 244 #ifdef HAVE_SSE
 245     if((CPUCapFlags&CPU_CAP_SSE))
 246         __control87_2(ctl->sse_state, _MCW_RC|_MCW_DN, NULL, &mode);
 247 #endif
 248 #elif defined(HAVE__CONTROLFP)
 249     _controlfp(ctl->state, _MCW_RC|_MCW_PC);
 250 #elif defined(HAVE_FESETROUND)
 251     fesetround(ctl->state);
 252 #endif
 253 }
 254
 255
 256 #ifdef _WIN32
 257 void pthread_once(pthread_once_t *once, void (*callback)(void))
 258 {
 259     LONG ret;
 260     while((ret=InterlockedExchange(once, 1)) == 1)
 261         sched_yield();
 262     if(ret == 0)
 263         callback();
 264     InterlockedExchange(once, 2);
 265 }
 266
 267
 268 int pthread_key_create(pthread_key_t *key, void (*callback)(void*))
 269 {
 270     *key = TlsAlloc();
 271     if(callback)
 272         InsertUIntMapEntry(&TlsDestructor, *key, callback);
 273     return 0;
 274 }
 275
 276 int pthread_key_delete(pthread_key_t key)
 277 {
 278     InsertUIntMapEntry(&TlsDestructor, key, NULL);
 279     TlsFree(key);
 280     return 0;
 281 }
 282
 283 void *pthread_getspecific(pthread_key_t key)
 284 { return TlsGetValue(key); }
 285
 286 int pthread_setspecific(pthread_key_t key, void *val)
 287 {
 288     TlsSetValue(key, val);
 289     return 0;
 290 }
 291
 292
 293 void *LoadLib(const char *name)
 294 { return LoadLibraryA(name); }
 295 void CloseLib(void *handle)
 296 { FreeLibrary((HANDLE)handle); }
 297 void *GetSymbol(void *handle, const char *name)
 298 {
 299     void *ret;
 300
 301     ret = (void*)GetProcAddress((HANDLE)handle, name);
 302     if(ret == NULL)
 303         ERR("Failed to load %s\n", name);
 304     return ret;
 305 }
 306
 307 WCHAR *strdupW(const WCHAR *str)
 308 {
 309     const WCHAR *n;
 310     WCHAR *ret;
 311     size_t len;
 312
 313     n = str;
 314     while(*n) n++;
 315     len = n - str;
 316
 317     ret = calloc(sizeof(WCHAR), len+1);
 318     if(ret != NULL)
 319         memcpy(ret, str, sizeof(WCHAR)*len);
 320     return ret;
 321 }
 322
 323 #else
 324
 325 #include <pthread.h>
 326 #ifdef HAVE_PTHREAD_NP_H
 327 #include <pthread_np.h>
 328 #endif
 329 #include <sched.h>
 330
 331 void InitializeCriticalSection(CRITICAL_SECTION *cs)
 332 {
 333     pthread_mutexattr_t attrib;
 334     int ret;
 335
 336     ret = pthread_mutexattr_init(&attrib);
 337     assert(ret == 0);
 338
 339     ret = pthread_mutexattr_settype(&attrib, PTHREAD_MUTEX_RECURSIVE);
 340 #ifdef HAVE_PTHREAD_NP_H
 341     if(ret != 0)
 342         ret = pthread_mutexattr_setkind_np(&attrib, PTHREAD_MUTEX_RECURSIVE);
 343 #endif
 344     assert(ret == 0);
 345     ret = pthread_mutex_init(cs, &attrib);
 346     assert(ret == 0);
 347
 348     pthread_mutexattr_destroy(&attrib);
 349 }
 350 void DeleteCriticalSection(CRITICAL_SECTION *cs)
 351 {
 352     int ret;
 353     ret = pthread_mutex_destroy(cs);
 354     assert(ret == 0);
 355 }
 356 void EnterCriticalSection(CRITICAL_SECTION *cs)
 357 {
 358     int ret;
 359     ret = pthread_mutex_lock(cs);
 360     assert(ret == 0);
 361 }
 362 void LeaveCriticalSection(CRITICAL_SECTION *cs)
 363 {
 364     int ret;
 365     ret = pthread_mutex_unlock(cs);
 366     assert(ret == 0);
 367 }
 368
 369 /* NOTE: This wrapper isn't quite accurate as it returns an ALuint, as opposed
 370  * to the expected DWORD. Both are defined as unsigned 32-bit types, however.
 371  * Additionally, Win32 is supposed to measure the time since Windows started,
 372  * as opposed to the actual time. */
 373 ALuint timeGetTime(void)
 374 {
 375 #if _POSIX_TIMERS > 0
 376     struct timespec ts;
 377     int ret = -1;
 378
 379 #if defined(_POSIX_MONOTONIC_CLOCK) && (_POSIX_MONOTONIC_CLOCK >= 0)
 380 #if _POSIX_MONOTONIC_CLOCK == 0
 381     static int hasmono = 0;
 382     if(hasmono > 0 || (hasmono == 0 &&
 383                        (hasmono=sysconf(_SC_MONOTONIC_CLOCK)) > 0))
 384 #endif
 385         ret = clock_gettime(CLOCK_MONOTONIC, &ts);
 386 #endif
 387     if(ret != 0)
 388         ret = clock_gettime(CLOCK_REALTIME, &ts);
 389     assert(ret == 0);
 390
 391     return ts.tv_nsec/1000000 + ts.tv_sec*1000;
 392 #else
 393     struct timeval tv;
 394     int ret;
 395
 396     ret = gettimeofday(&tv, NULL);
 397     assert(ret == 0);
 398
 399     return tv.tv_usec/1000 + tv.tv_sec*1000;
 400 #endif
 401 }
 402
 403 void Sleep(ALuint t)
 404 {
 405     struct timespec tv, rem;
 406     tv.tv_nsec = (t*1000000)%1000000000;
 407     tv.tv_sec = t/1000;
 408
 409     while(nanosleep(&tv, &rem) == -1 && errno == EINTR)
 410         tv = rem;
 411 }
 412
 413 #ifdef HAVE_DLFCN_H
 414
 415 void *LoadLib(const char *name)
 416 {
 417     const char *err;
 418     void *handle;
 419
 420     dlerror();
 421     handle = dlopen(name, RTLD_NOW);
 422     if((err=dlerror()) != NULL)
 423         handle = NULL;
 424     return handle;
 425 }
 426 void CloseLib(void *handle)
 427 { dlclose(handle); }
 428 void *GetSymbol(void *handle, const char *name)
 429 {
 430     const char *err;
 431     void *sym;
 432
 433     dlerror();
 434     sym = dlsym(handle, name);
 435     if((err=dlerror()) != NULL)
 436     {
 437         WARN("Failed to load %s: %s\n", name, err);
 438         sym = NULL;
 439     }
 440     return sym;
 441 }
 442
 443 #endif
 444 #endif
 445
 446
 447 void al_print(const char *type, const char *func, const char *fmt, ...)
 448 {
 449     char str[256];
 450     int i;
 451
 452     i = snprintf(str, sizeof(str), "AL lib: %s %s: ", type, func);
 453     if(i > 0 && (unsigned int)i < sizeof(str))
 454     {
 455         va_list ap;
 456         va_start(ap, fmt);
 457         vsnprintf(str+i, sizeof(str)-i, fmt, ap);
 458         va_end(ap);
 459     }
 460     str[sizeof(str)-1] = 0;
 461
 462     fprintf(LogFile, "%s", str);
 463     fflush(LogFile);
 464 }
 465
 466
 467 void SetRTPriority(void)
 468 {
 469     ALboolean failed = AL_FALSE;
 470
 471 #ifdef _WIN32
 472     if(RTPrioLevel > 0)
 473         failed = !SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL);
 474 #elif defined(HAVE_PTHREAD_SETSCHEDPARAM) && !defined(__OpenBSD__)
 475     if(RTPrioLevel > 0)
 476     {
 477         struct sched_param param;
 478         /* Use the minimum real-time priority possible for now (on Linux this
 479          * should be 1 for SCHED_RR) */
 480         param.sched_priority = sched_get_priority_min(SCHED_RR);
 481         failed = !!pthread_setschedparam(pthread_self(), SCHED_RR, &param);
 482     }
 483 #else
 484     /* Real-time priority not available */
 485     failed = (RTPrioLevel>0);
 486 #endif
 487     if(failed)
 488         ERR("Failed to set priority level for thread\n");
 489 }
 490
 491
 492 static void Lock(volatile ALenum *l)
 493 {
 494     while(ExchangeInt(l, AL_TRUE) == AL_TRUE)
 495         sched_yield();
 496 }
 497
 498 static void Unlock(volatile ALenum *l)
 499 {
 500     ExchangeInt(l, AL_FALSE);
 501 }
 502
 503 void RWLockInit(RWLock *lock)
 504 {
 505     lock->read_count = 0;
 506     lock->write_count = 0;
 507     lock->read_lock = AL_FALSE;
 508     lock->read_entry_lock = AL_FALSE;
 509     lock->write_lock = AL_FALSE;
 510 }
 511
 512 void ReadLock(RWLock *lock)
 513 {
 514     Lock(&lock->read_entry_lock);
 515     Lock(&lock->read_lock);
 516     if(IncrementRef(&lock->read_count) == 1)
 517         Lock(&lock->write_lock);
 518     Unlock(&lock->read_lock);
 519     Unlock(&lock->read_entry_lock);
 520 }
 521
 522 void ReadUnlock(RWLock *lock)
 523 {
 524     if(DecrementRef(&lock->read_count) == 0)
 525         Unlock(&lock->write_lock);
 526 }
 527
 528 void WriteLock(RWLock *lock)
 529 {
 530     if(IncrementRef(&lock->write_count) == 1)
 531         Lock(&lock->read_lock);
 532     Lock(&lock->write_lock);
 533 }
 534
 535 void WriteUnlock(RWLock *lock)
 536 {
 537     Unlock(&lock->write_lock);
 538     if(DecrementRef(&lock->write_count) == 0)
 539         Unlock(&lock->read_lock);
 540 }
 541
 542
 543 void InitUIntMap(UIntMap *map, ALsizei limit)
 544 {
 545     map->array = NULL;
 546     map->size = 0;
 547     map->maxsize = 0;
 548     map->limit = limit;
 549     RWLockInit(&map->lock);
 550 }
 551
 552 void ResetUIntMap(UIntMap *map)
 553 {
 554     WriteLock(&map->lock);
 555     free(map->array);
 556     map->array = NULL;
 557     map->size = 0;
 558     map->maxsize = 0;
 559     WriteUnlock(&map->lock);
 560 }
 561
 562 ALenum InsertUIntMapEntry(UIntMap *map, ALuint key, ALvoid *value)
 563 {
 564     ALsizei pos = 0;
 565
 566     WriteLock(&map->lock);
 567     if(map->size > 0)
 568     {
 569         ALsizei low = 0;
 570         ALsizei high = map->size - 1;
 571         while(low < high)
 572         {
 573             ALsizei mid = low + (high-low)/2;
 574             if(map->array[mid].key < key)
 575                 low = mid + 1;
 576             else
 577                 high = mid;
 578         }
 579         if(map->array[low].key < key)
 580             low++;
 581         pos = low;
 582     }
 583
 584     if(pos == map->size || map->array[pos].key != key)
 585     {
 586         if(map->size == map->limit)
 587         {
 588             WriteUnlock(&map->lock);
 589             return AL_OUT_OF_MEMORY;
 590         }
 591
 592         if(map->size == map->maxsize)
 593         {
 594             ALvoid *temp = NULL;
 595             ALsizei newsize;
 596
 597             newsize = (map->maxsize ? (map->maxsize<<1) : 4);
 598             if(newsize >= map->maxsize)
 599                 temp = realloc(map->array, newsize*sizeof(map->array[0]));
 600             if(!temp)
 601             {
 602                 WriteUnlock(&map->lock);
 603                 return AL_OUT_OF_MEMORY;
 604             }
 605             map->array = temp;
 606             map->maxsize = newsize;
 607         }
 608
 609         if(pos < map->size)
 610             memmove(&map->array[pos+1], &map->array[pos],
 611                     (map->size-pos)*sizeof(map->array[0]));
 612         map->size++;
 613     }
 614     map->array[pos].key = key;
 615     map->array[pos].value = value;
 616     WriteUnlock(&map->lock);
 617
 618     return AL_NO_ERROR;
 619 }
 620
 621 ALvoid *RemoveUIntMapKey(UIntMap *map, ALuint key)
 622 {
 623     ALvoid *ptr = NULL;
 624     WriteLock(&map->lock);
 625     if(map->size > 0)
 626     {
 627         ALsizei low = 0;
 628         ALsizei high = map->size - 1;
 629         while(low < high)
 630         {
 631             ALsizei mid = low + (high-low)/2;
 632             if(map->array[mid].key < key)
 633                 low = mid + 1;
 634             else
 635                 high = mid;
 636         }
 637         if(map->array[low].key == key)
 638         {
 639             ptr = map->array[low].value;
 640             if(low < map->size-1)
 641                 memmove(&map->array[low], &map->array[low+1],
 642                         (map->size-1-low)*sizeof(map->array[0]));
 643             map->size--;
 644         }
 645     }
 646     WriteUnlock(&map->lock);
 647     return ptr;
 648 }
 649
 650 ALvoid *LookupUIntMapKey(UIntMap *map, ALuint key)
 651 {
 652     ALvoid *ptr = NULL;
 653     ReadLock(&map->lock);
 654     if(map->size > 0)
 655     {
 656         ALsizei low = 0;
 657         ALsizei high = map->size - 1;
 658         while(low < high)
 659         {
 660             ALsizei mid = low + (high-low)/2;
 661             if(map->array[mid].key < key)
 662                 low = mid + 1;
 663             else
 664                 high = mid;
 665         }
 666         if(map->array[low].key == key)
 667             ptr = map->array[low].value;
 668     }
 669     ReadUnlock(&map->lock);
 670     return ptr;
 671 }