common/threads.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2007 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.,
  17  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include "threads.h"
  24
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <errno.h>
  28
  29 #include "uintmap.h"
  30
  31
  32 extern inline althrd_t althrd_current(void);
  33 extern inline int althrd_equal(althrd_t thr0, althrd_t thr1);
  34 extern inline void althrd_exit(int res);
  35 extern inline void althrd_yield(void);
  36
  37 extern inline int almtx_lock(almtx_t *mtx);
  38 extern inline int almtx_unlock(almtx_t *mtx);
  39 extern inline int almtx_trylock(almtx_t *mtx);
  40
  41 extern inline void *altss_get(altss_t tss_id);
  42 extern inline int altss_set(altss_t tss_id, void *val);
  43
  44
  45 #ifndef UNUSED
  46 #if defined(__cplusplus)
  47 #define UNUSED(x)
  48 #elif defined(__GNUC__)
  49 #define UNUSED(x) UNUSED_##x __attribute__((unused))
  50 #elif defined(__LCLINT__)
  51 #define UNUSED(x) /*@unused@*/ x
  52 #else
  53 #define UNUSED(x) x
  54 #endif
  55 #endif
  56
  57
  58 #define THREAD_STACK_SIZE (1*1024*1024) /* 1MB */
  59
  60 #ifdef _WIN32
  61
  62 #define WIN32_LEAN_AND_MEAN
  63 #include <windows.h>
  64 #include <mmsystem.h>
  65
  66
  67 void althrd_setname(althrd_t thr, const char *name)
  68 {
  69 #if defined(_MSC_VER)
  70 #define MS_VC_EXCEPTION 0x406D1388
  71 #pragma pack(push,8)
  72     struct {
  73         DWORD dwType;     // Must be 0x1000.
  74         LPCSTR szName;    // Pointer to name (in user addr space).
  75         DWORD dwThreadID; // Thread ID (-1=caller thread).
  76         DWORD dwFlags;    // Reserved for future use, must be zero.
  77     } info;
  78 #pragma pack(pop)
  79     info.dwType = 0x1000;
  80     info.szName = name;
  81     info.dwThreadID = thr;
  82     info.dwFlags = 0;
  83
  84     __try {
  85         RaiseException(MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(ULONG_PTR), (ULONG_PTR*)&info);
  86     }
  87     __except(EXCEPTION_CONTINUE_EXECUTION) {
  88     }
  89 #undef MS_VC_EXCEPTION
  90 #else
  91     (void)thr;
  92     (void)name;
  93 #endif
  94 }
  95
  96
  97 static UIntMap ThrdIdHandle = UINTMAP_STATIC_INITIALIZE;
  98
  99 static void NTAPI althrd_callback(void* UNUSED(handle), DWORD reason, void* UNUSED(reserved))
 100 {
 101     if(reason == DLL_PROCESS_DETACH)
 102         ResetUIntMap(&ThrdIdHandle);
 103 }
 104 #ifdef _MSC_VER
 105 #pragma section(".CRT$XLC",read)
 106 __declspec(allocate(".CRT$XLC")) PIMAGE_TLS_CALLBACK althrd_callback_ = althrd_callback;
 107 #elif defined(__GNUC__)
 108 PIMAGE_TLS_CALLBACK althrd_callback_ __attribute__((section(".CRT$XLC"))) = althrd_callback;
 109 #else
 110 PIMAGE_TLS_CALLBACK althrd_callback_ = althrd_callback;
 111 #endif
 112
 113
 114 typedef struct thread_cntr {
 115     althrd_start_t func;
 116     void *arg;
 117 } thread_cntr;
 118
 119 static DWORD WINAPI althrd_starter(void *arg)
 120 {
 121     thread_cntr cntr;
 122     memcpy(&cntr, arg, sizeof(cntr));
 123     free(arg);
 124
 125     return (DWORD)((*cntr.func)(cntr.arg));
 126 }
 127
 128
 129 int althrd_create(althrd_t *thr, althrd_start_t func, void *arg)
 130 {
 131     thread_cntr *cntr;
 132     DWORD thrid;
 133     HANDLE hdl;
 134
 135     cntr = malloc(sizeof(*cntr));
 136     if(!cntr) return althrd_nomem;
 137
 138     cntr->func = func;
 139     cntr->arg = arg;
 140
 141     hdl = CreateThread(NULL, THREAD_STACK_SIZE, althrd_starter, cntr, 0, &thrid);
 142     if(!hdl)
 143     {
 144         free(cntr);
 145         return althrd_error;
 146     }
 147     InsertUIntMapEntry(&ThrdIdHandle, thrid, hdl);
 148
 149     *thr = thrid;
 150     return althrd_success;
 151 }
 152
 153 int althrd_detach(althrd_t thr)
 154 {
 155     HANDLE hdl = RemoveUIntMapKey(&ThrdIdHandle, thr);
 156     if(!hdl) return althrd_error;
 157
 158     CloseHandle(hdl);
 159     return althrd_success;
 160 }
 161
 162 int althrd_join(althrd_t thr, int *res)
 163 {
 164     DWORD code;
 165
 166     HANDLE hdl = RemoveUIntMapKey(&ThrdIdHandle, thr);
 167     if(!hdl) return althrd_error;
 168
 169     WaitForSingleObject(hdl, INFINITE);
 170     GetExitCodeThread(hdl, &code);
 171     CloseHandle(hdl);
 172
 173     if(res != NULL)
 174         *res = (int)code;
 175     return althrd_success;
 176 }
 177
 178 int althrd_sleep(const struct timespec *ts, struct timespec* UNUSED(rem))
 179 {
 180     DWORD msec;
 181
 182     if(ts->tv_sec < 0 || ts->tv_sec >= (0x7fffffff / 1000) ||
 183        ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000)
 184         return -2;
 185
 186     msec  = (DWORD)(ts->tv_sec * 1000);
 187     msec += (DWORD)((ts->tv_nsec+999999) / 1000000);
 188     Sleep(msec);
 189
 190     return 0;
 191 }
 192
 193
 194 int almtx_init(almtx_t *mtx, int type)
 195 {
 196     if(!mtx) return althrd_error;
 197     type &= ~(almtx_recursive|almtx_timed);
 198     if(type != almtx_plain)
 199         return althrd_error;
 200
 201     InitializeCriticalSection(mtx);
 202     return althrd_success;
 203 }
 204
 205 void almtx_destroy(almtx_t *mtx)
 206 {
 207     DeleteCriticalSection(mtx);
 208 }
 209
 210 int almtx_timedlock(almtx_t *mtx, const struct timespec *ts)
 211 {
 212     int ret;
 213
 214     if(!mtx || !ts)
 215         return althrd_error;
 216
 217     while((ret=almtx_trylock(mtx)) == althrd_busy)
 218     {
 219         struct timespec now;
 220
 221         if(ts->tv_sec < 0 || ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000 ||
 222            altimespec_get(&now, AL_TIME_UTC) != AL_TIME_UTC)
 223             return althrd_error;
 224         if(now.tv_sec > ts->tv_sec || (now.tv_sec == ts->tv_sec && now.tv_nsec >= ts->tv_nsec))
 225             return althrd_timedout;
 226
 227         althrd_yield();
 228     }
 229
 230     return ret;
 231 }
 232
 233 #if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0600
 234 int alcnd_init(alcnd_t *cond)
 235 {
 236     InitializeConditionVariable(cond);
 237     return althrd_success;
 238 }
 239
 240 int alcnd_signal(alcnd_t *cond)
 241 {
 242     WakeConditionVariable(cond);
 243     return althrd_success;
 244 }
 245
 246 int alcnd_broadcast(alcnd_t *cond)
 247 {
 248     WakeAllConditionVariable(cond);
 249     return althrd_success;
 250 }
 251
 252 int alcnd_wait(alcnd_t *cond, almtx_t *mtx)
 253 {
 254     if(SleepConditionVariableCS(cond, mtx, INFINITE) != 0)
 255         return althrd_success;
 256     return althrd_error;
 257 }
 258
 259 int alcnd_timedwait(alcnd_t *cond, almtx_t *mtx, const struct timespec *time_point)
 260 {
 261     struct timespec curtime;
 262     DWORD sleeptime;
 263
 264     if(altimespec_get(&curtime, AL_TIME_UTC) != AL_TIME_UTC)
 265         return althrd_error;
 266
 267     if(curtime.tv_sec > time_point->tv_sec || (curtime.tv_sec == time_point->tv_sec &&
 268                                                curtime.tv_nsec >= time_point->tv_nsec))
 269     {
 270         if(SleepConditionVariableCS(cond, mtx, 0) != 0)
 271             return althrd_success;
 272     }
 273     else
 274     {
 275         sleeptime  = (time_point->tv_nsec - curtime.tv_nsec + 999999)/1000000;
 276         sleeptime += (time_point->tv_sec - curtime.tv_sec)*1000;
 277         if(SleepConditionVariableCS(cond, mtx, sleeptime) != 0)
 278             return althrd_success;
 279     }
 280     return (GetLastError()==ERROR_TIMEOUT) ? althrd_timedout : althrd_error;
 281 }
 282
 283 void alcnd_destroy(alcnd_t* UNUSED(cond))
 284 {
 285     /* Nothing to delete? */
 286 }
 287
 288 #else
 289
 290 /* WARNING: This is a rather poor implementation of condition variables, with
 291  * known problems. However, it's simple, efficient, and good enough for now to
 292  * not require Vista. Based on "Strategies for Implementing POSIX Condition
 293  * Variables" by Douglas C. Schmidt and Irfan Pyarali:
 294  * http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
 295  */
 296 /* A better solution may be using Wine's implementation. It requires internals
 297  * (NtCreateKeyedEvent, NtReleaseKeyedEvent, and NtWaitForKeyedEvent) from
 298  * ntdll, and implemention of exchange and compare-exchange for RefCounts.
 299  */
 300
 301 typedef struct {
 302     RefCount wait_count;
 303
 304     HANDLE events[2];
 305 } _int_alcnd_t;
 306 enum {
 307     SIGNAL = 0,
 308     BROADCAST = 1
 309 };
 310
 311 int alcnd_init(alcnd_t *cond)
 312 {
 313     _int_alcnd_t *icond = calloc(1, sizeof(*icond));
 314     if(!icond) return althrd_nomem;
 315
 316     InitRef(&icond->wait_count, 0);
 317
 318     icond->events[SIGNAL] = CreateEventW(NULL, FALSE, FALSE, NULL);
 319     icond->events[BROADCAST] = CreateEventW(NULL, TRUE, FALSE, NULL);
 320     if(!icond->events[SIGNAL] || !icond->events[BROADCAST])
 321     {
 322         if(icond->events[SIGNAL])
 323             CloseHandle(icond->events[SIGNAL]);
 324         if(icond->events[BROADCAST])
 325             CloseHandle(icond->events[BROADCAST]);
 326         free(icond);
 327         return althrd_error;
 328     }
 329
 330     cond->Ptr = icond;
 331     return althrd_success;
 332 }
 333
 334 int alcnd_signal(alcnd_t *cond)
 335 {
 336     _int_alcnd_t *icond = cond->Ptr;
 337     if(ReadRef(&icond->wait_count) > 0)
 338         SetEvent(icond->events[SIGNAL]);
 339     return althrd_success;
 340 }
 341
 342 int alcnd_broadcast(alcnd_t *cond)
 343 {
 344     _int_alcnd_t *icond = cond->Ptr;
 345     if(ReadRef(&icond->wait_count) > 0)
 346         SetEvent(icond->events[BROADCAST]);
 347     return althrd_success;
 348 }
 349
 350 int alcnd_wait(alcnd_t *cond, almtx_t *mtx)
 351 {
 352     _int_alcnd_t *icond = cond->Ptr;
 353     int res;
 354
 355     IncrementRef(&icond->wait_count);
 356     LeaveCriticalSection(mtx);
 357
 358     res = WaitForMultipleObjects(2, icond->events, FALSE, INFINITE);
 359
 360     if(DecrementRef(&icond->wait_count) == 0 && res == WAIT_OBJECT_0+BROADCAST)
 361         ResetEvent(icond->events[BROADCAST]);
 362     EnterCriticalSection(mtx);
 363
 364     return althrd_success;
 365 }
 366
 367 int alcnd_timedwait(alcnd_t *cond, almtx_t *mtx, const struct timespec *time_point)
 368 {
 369     _int_alcnd_t *icond = cond->Ptr;
 370     struct timespec curtime;
 371     DWORD sleeptime;
 372     int res;
 373
 374     if(altimespec_get(&curtime, AL_TIME_UTC) != AL_TIME_UTC)
 375         return althrd_error;
 376
 377     if(curtime.tv_sec > time_point->tv_sec || (curtime.tv_sec == time_point->tv_sec &&
 378                                                curtime.tv_nsec >= time_point->tv_nsec))
 379         sleeptime = 0;
 380     else
 381     {
 382         sleeptime  = (time_point->tv_nsec - curtime.tv_nsec + 999999)/1000000;
 383         sleeptime += (time_point->tv_sec - curtime.tv_sec)*1000;
 384     }
 385
 386     IncrementRef(&icond->wait_count);
 387     LeaveCriticalSection(mtx);
 388
 389     res = WaitForMultipleObjects(2, icond->events, FALSE, sleeptime);
 390
 391     if(DecrementRef(&icond->wait_count) == 0 && res == WAIT_OBJECT_0+BROADCAST)
 392         ResetEvent(icond->events[BROADCAST]);
 393     EnterCriticalSection(mtx);
 394
 395     return (res == WAIT_TIMEOUT) ? althrd_timedout : althrd_success;
 396 }
 397
 398 void alcnd_destroy(alcnd_t *cond)
 399 {
 400     _int_alcnd_t *icond = cond->Ptr;
 401     CloseHandle(icond->events[SIGNAL]);
 402     CloseHandle(icond->events[BROADCAST]);
 403     free(icond);
 404 }
 405 #endif /* defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0600 */
 406
 407
 408 /* An associative map of uint:void* pairs. The key is the TLS index (given by
 409  * TlsAlloc), and the value is the altss_dtor_t callback. When a thread exits,
 410  * we iterate over the TLS indices for their thread-local value and call the
 411  * destructor function with it if they're both not NULL. To avoid using
 412  * DllMain, a PIMAGE_TLS_CALLBACK function pointer is placed in a ".CRT$XLx"
 413  * section (where x is a character A to Z) which will be called by the CRT.
 414  */
 415 static UIntMap TlsDestructors = UINTMAP_STATIC_INITIALIZE;
 416
 417 static void NTAPI altss_callback(void* UNUSED(handle), DWORD reason, void* UNUSED(reserved))
 418 {
 419     ALsizei i;
 420
 421     if(reason == DLL_PROCESS_DETACH)
 422     {
 423         ResetUIntMap(&TlsDestructors);
 424         return;
 425     }
 426     if(reason != DLL_THREAD_DETACH)
 427         return;
 428
 429     LockUIntMapRead(&TlsDestructors);
 430     for(i = 0;i < TlsDestructors.size;i++)
 431     {
 432         void *ptr = altss_get(TlsDestructors.array[i].key);
 433         altss_dtor_t callback = (altss_dtor_t)TlsDestructors.array[i].value;
 434         if(ptr && callback)
 435             callback(ptr);
 436     }
 437     UnlockUIntMapRead(&TlsDestructors);
 438 }
 439 #ifdef _MSC_VER
 440 #pragma section(".CRT$XLB",read)
 441 __declspec(allocate(".CRT$XLB")) PIMAGE_TLS_CALLBACK altss_callback_ = altss_callback;
 442 #elif defined(__GNUC__)
 443 PIMAGE_TLS_CALLBACK altss_callback_ __attribute__((section(".CRT$XLB"))) = altss_callback;
 444 #else
 445 #warning "No TLS callback support, thread-local contexts may leak references on poorly written applications."
 446 PIMAGE_TLS_CALLBACK altss_callback_ = altss_callback;
 447 #endif
 448
 449 int altss_create(altss_t *tss_id, altss_dtor_t callback)
 450 {
 451     DWORD key = TlsAlloc();
 452     if(key == TLS_OUT_OF_INDEXES)
 453         return althrd_error;
 454
 455     *tss_id = key;
 456     if(callback != NULL)
 457         InsertUIntMapEntry(&TlsDestructors, key, callback);
 458     return althrd_success;
 459 }
 460
 461 void altss_delete(altss_t tss_id)
 462 {
 463     RemoveUIntMapKey(&TlsDestructors, tss_id);
 464     TlsFree(tss_id);
 465 }
 466
 467
 468 int altimespec_get(struct timespec *ts, int base)
 469 {
 470     static_assert(sizeof(FILETIME) == sizeof(ULARGE_INTEGER),
 471                   "Size of FILETIME does not match ULARGE_INTEGER");
 472     if(base == AL_TIME_UTC)
 473     {
 474         union {
 475             FILETIME ftime;
 476             ULARGE_INTEGER ulint;
 477         } systime;
 478         GetSystemTimeAsFileTime(&systime.ftime);
 479         /* FILETIME is in 100-nanosecond units, or 1/10th of a microsecond. */
 480         ts->tv_sec = systime.ulint.QuadPart/10000000;
 481         ts->tv_nsec = (systime.ulint.QuadPart%10000000) * 100;
 482         return base;
 483     }
 484
 485     return 0;
 486 }
 487
 488
 489 void alcall_once(alonce_flag *once, void (*callback)(void))
 490 {
 491     LONG ret;
 492     while((ret=InterlockedExchange(once, 1)) == 1)
 493         althrd_yield();
 494     if(ret == 0)
 495         (*callback)();
 496     InterlockedExchange(once, 2);
 497 }
 498
 499 #else
 500
 501 #include <sys/time.h>
 502 #include <unistd.h>
 503 #include <pthread.h>
 504 #ifdef HAVE_PTHREAD_NP_H
 505 #include <pthread_np.h>
 506 #endif
 507
 508
 509 extern inline int althrd_sleep(const struct timespec *ts, struct timespec *rem);
 510 extern inline void alcall_once(alonce_flag *once, void (*callback)(void));
 511
 512
 513 void althrd_setname(althrd_t thr, const char *name)
 514 {
 515 #if defined(HAVE_PTHREAD_SETNAME_NP)
 516 #if defined(PTHREAD_SETNAME_NP_ONE_PARAM)
 517     if(althrd_equal(thr, althrd_current()))
 518         pthread_setname_np(name);
 519 #else
 520     pthread_setname_np(thr, name);
 521 #endif
 522 #elif defined(HAVE_PTHREAD_SET_NAME_NP)
 523     pthread_set_name_np(thr, name);
 524 #else
 525     (void)thr;
 526     (void)name;
 527 #endif
 528 }
 529
 530
 531 typedef struct thread_cntr {
 532     althrd_start_t func;
 533     void *arg;
 534 } thread_cntr;
 535
 536 static void *althrd_starter(void *arg)
 537 {
 538     thread_cntr cntr;
 539     memcpy(&cntr, arg, sizeof(cntr));
 540     free(arg);
 541
 542     return (void*)(intptr_t)((*cntr.func)(cntr.arg));
 543 }
 544
 545
 546 int althrd_create(althrd_t *thr, althrd_start_t func, void *arg)
 547 {
 548     thread_cntr *cntr;
 549     pthread_attr_t attr;
 550
 551     cntr = malloc(sizeof(*cntr));
 552     if(!cntr) return althrd_nomem;
 553
 554     if(pthread_attr_init(&attr) != 0)
 555     {
 556         free(cntr);
 557         return althrd_error;
 558     }
 559     if(pthread_attr_setstacksize(&attr, THREAD_STACK_SIZE) != 0)
 560     {
 561         pthread_attr_destroy(&attr);
 562         free(cntr);
 563         return althrd_error;
 564     }
 565
 566     cntr->func = func;
 567     cntr->arg = arg;
 568     if(pthread_create(thr, &attr, althrd_starter, cntr) != 0)
 569     {
 570         pthread_attr_destroy(&attr);
 571         free(cntr);
 572         return althrd_error;
 573     }
 574     pthread_attr_destroy(&attr);
 575
 576     return althrd_success;
 577 }
 578
 579 int althrd_detach(althrd_t thr)
 580 {
 581     if(pthread_detach(thr) != 0)
 582         return althrd_error;
 583     return althrd_success;
 584 }
 585
 586 int althrd_join(althrd_t thr, int *res)
 587 {
 588     void *code;
 589
 590     if(pthread_join(thr, &code) != 0)
 591         return althrd_error;
 592     if(res != NULL)
 593         *res = (int)(intptr_t)code;
 594     return althrd_success;
 595 }
 596
 597
 598 int almtx_init(almtx_t *mtx, int type)
 599 {
 600     int ret;
 601
 602     if(!mtx) return althrd_error;
 603     if((type&~(almtx_recursive|almtx_timed)) != 0)
 604         return althrd_error;
 605
 606     type &= ~almtx_timed;
 607     if(type == almtx_plain)
 608         ret = pthread_mutex_init(mtx, NULL);
 609     else
 610     {
 611         pthread_mutexattr_t attr;
 612
 613         ret = pthread_mutexattr_init(&attr);
 614         if(ret) return althrd_error;
 615
 616         if(type == almtx_recursive)
 617         {
 618             ret = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
 619 #ifdef HAVE_PTHREAD_MUTEXATTR_SETKIND_NP
 620             if(ret != 0)
 621                 ret = pthread_mutexattr_setkind_np(&attr, PTHREAD_MUTEX_RECURSIVE);
 622 #endif
 623         }
 624         else
 625             ret = 1;
 626         if(ret == 0)
 627             ret = pthread_mutex_init(mtx, &attr);
 628         pthread_mutexattr_destroy(&attr);
 629     }
 630     return ret ? althrd_error : althrd_success;
 631 }
 632
 633 void almtx_destroy(almtx_t *mtx)
 634 {
 635     pthread_mutex_destroy(mtx);
 636 }
 637
 638 int almtx_timedlock(almtx_t *mtx, const struct timespec *ts)
 639 {
 640     int ret;
 641
 642 #ifdef HAVE_PTHREAD_MUTEX_TIMEDLOCK
 643     ret = pthread_mutex_timedlock(mtx, ts);
 644     switch(ret)
 645     {
 646         case 0: return althrd_success;
 647         case ETIMEDOUT: return althrd_timedout;
 648         case EBUSY: return althrd_busy;
 649     }
 650     return althrd_error;
 651 #else
 652     if(!mtx || !ts)
 653         return althrd_error;
 654
 655     while((ret=almtx_trylock(mtx)) == althrd_busy)
 656     {
 657         struct timespec now;
 658
 659         if(ts->tv_sec < 0 || ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000 ||
 660            altimespec_get(&now, AL_TIME_UTC) != AL_TIME_UTC)
 661             return althrd_error;
 662         if(now.tv_sec > ts->tv_sec || (now.tv_sec == ts->tv_sec && now.tv_nsec >= ts->tv_nsec))
 663             return althrd_timedout;
 664
 665         althrd_yield();
 666     }
 667
 668     return ret;
 669 #endif
 670 }
 671
 672 int alcnd_init(alcnd_t *cond)
 673 {
 674     if(pthread_cond_init(cond, NULL) == 0)
 675         return althrd_success;
 676     return althrd_error;
 677 }
 678
 679 int alcnd_signal(alcnd_t *cond)
 680 {
 681     if(pthread_cond_signal(cond) == 0)
 682         return althrd_success;
 683     return althrd_error;
 684 }
 685
 686 int alcnd_broadcast(alcnd_t *cond)
 687 {
 688     if(pthread_cond_broadcast(cond) == 0)
 689         return althrd_success;
 690     return althrd_error;
 691 }
 692
 693 int alcnd_wait(alcnd_t *cond, almtx_t *mtx)
 694 {
 695     if(pthread_cond_wait(cond, mtx) == 0)
 696         return althrd_success;
 697     return althrd_error;
 698 }
 699
 700 int alcnd_timedwait(alcnd_t *cond, almtx_t *mtx, const struct timespec *time_point)
 701 {
 702     if(pthread_cond_timedwait(cond, mtx, time_point) == 0)
 703         return althrd_success;
 704     return althrd_error;
 705 }
 706
 707 void alcnd_destroy(alcnd_t *cond)
 708 {
 709     pthread_cond_destroy(cond);
 710 }
 711
 712
 713 int altss_create(altss_t *tss_id, altss_dtor_t callback)
 714 {
 715     if(pthread_key_create(tss_id, callback) != 0)
 716         return althrd_error;
 717     return althrd_success;
 718 }
 719
 720 void altss_delete(altss_t tss_id)
 721 {
 722     pthread_key_delete(tss_id);
 723 }
 724
 725
 726 int altimespec_get(struct timespec *ts, int base)
 727 {
 728     if(base == AL_TIME_UTC)
 729     {
 730         int ret;
 731 #if _POSIX_TIMERS > 0
 732         ret = clock_gettime(CLOCK_REALTIME, ts);
 733         if(ret == 0) return base;
 734 #else /* _POSIX_TIMERS > 0 */
 735         struct timeval tv;
 736         ret = gettimeofday(&tv, NULL);
 737         if(ret == 0)
 738         {
 739             ts->tv_sec = tv.tv_sec;
 740             ts->tv_nsec = tv.tv_usec * 1000;
 741             return base;
 742         }
 743 #endif
 744     }
 745
 746     return 0;
 747 }
 748
 749 #endif
 750
 751
 752 void al_nssleep(unsigned long nsec)
 753 {
 754     struct timespec ts, rem;
 755     ts.tv_sec = nsec / 1000000000ul;
 756     ts.tv_nsec = nsec % 1000000000ul;
 757
 758     while(althrd_sleep(&ts, &rem) == -1)
 759         ts = rem;
 760 }