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     sleeptime  = (time_point->tv_nsec - curtime.tv_nsec + 999999)/1000000;
 268     sleeptime += (time_point->tv_sec - curtime.tv_sec)*1000;
 269     if(SleepConditionVariableCS(cond, mtx, sleeptime) != 0)
 270         return althrd_success;
 271     return (GetLastError()==ERROR_TIMEOUT) ? althrd_timedout : althrd_error;
 272 }
 273
 274 void alcnd_destroy(alcnd_t* UNUSED(cond))
 275 {
 276     /* Nothing to delete? */
 277 }
 278
 279 #else
 280
 281 /* WARNING: This is a rather poor implementation of condition variables, with
 282  * known problems. However, it's simple, efficient, and good enough for now to
 283  * not require Vista. Based on "Strategies for Implementing POSIX Condition
 284  * Variables" by Douglas C. Schmidt and Irfan Pyarali:
 285  * http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
 286  */
 287 /* A better solution may be using Wine's implementation. It requires internals
 288  * (NtCreateKeyedEvent, NtReleaseKeyedEvent, and NtWaitForKeyedEvent) from
 289  * ntdll, and implemention of exchange and compare-exchange for RefCounts.
 290  */
 291
 292 typedef struct {
 293     RefCount wait_count;
 294
 295     HANDLE events[2];
 296 } _int_alcnd_t;
 297 enum {
 298     SIGNAL = 0,
 299     BROADCAST = 1
 300 };
 301
 302 int alcnd_init(alcnd_t *cond)
 303 {
 304     _int_alcnd_t *icond = calloc(1, sizeof(*icond));
 305     if(!icond) return althrd_nomem;
 306
 307     InitRef(&icond->wait_count, 0);
 308
 309     icond->events[SIGNAL] = CreateEvent(NULL, FALSE, FALSE, NULL);
 310     icond->events[BROADCAST] = CreateEvent(NULL, TRUE, FALSE, NULL);
 311     if(!icond->events[SIGNAL] || !icond->events[BROADCAST])
 312     {
 313         if(icond->events[SIGNAL])
 314             CloseHandle(icond->events[SIGNAL]);
 315         if(icond->events[BROADCAST])
 316             CloseHandle(icond->events[BROADCAST]);
 317         free(icond);
 318         return althrd_error;
 319     }
 320
 321     cond->Ptr = icond;
 322     return althrd_success;
 323 }
 324
 325 int alcnd_signal(alcnd_t *cond)
 326 {
 327     _int_alcnd_t *icond = cond->Ptr;
 328     if(ReadRef(&icond->wait_count) > 0)
 329         SetEvent(icond->events[SIGNAL]);
 330     return althrd_success;
 331 }
 332
 333 int alcnd_broadcast(alcnd_t *cond)
 334 {
 335     _int_alcnd_t *icond = cond->Ptr;
 336     if(ReadRef(&icond->wait_count) > 0)
 337         SetEvent(icond->events[BROADCAST]);
 338     return althrd_success;
 339 }
 340
 341 int alcnd_wait(alcnd_t *cond, almtx_t *mtx)
 342 {
 343     _int_alcnd_t *icond = cond->Ptr;
 344     int res;
 345
 346     IncrementRef(&icond->wait_count);
 347     LeaveCriticalSection(mtx);
 348
 349     res = WaitForMultipleObjects(2, icond->events, FALSE, INFINITE);
 350
 351     if(DecrementRef(&icond->wait_count) == 0 && res == WAIT_OBJECT_0+BROADCAST)
 352         ResetEvent(icond->events[BROADCAST]);
 353     EnterCriticalSection(mtx);
 354
 355     return althrd_success;
 356 }
 357
 358 int alcnd_timedwait(alcnd_t *cond, almtx_t *mtx, const struct timespec *time_point)
 359 {
 360     _int_alcnd_t *icond = cond->Ptr;
 361     struct timespec curtime;
 362     DWORD sleeptime;
 363     int res;
 364
 365     if(altimespec_get(&curtime, AL_TIME_UTC) != AL_TIME_UTC)
 366         return althrd_error;
 367     sleeptime  = (time_point->tv_nsec - curtime.tv_nsec + 999999)/1000000;
 368     sleeptime += (time_point->tv_sec - curtime.tv_sec)*1000;
 369
 370     IncrementRef(&icond->wait_count);
 371     LeaveCriticalSection(mtx);
 372
 373     res = WaitForMultipleObjects(2, icond->events, FALSE, sleeptime);
 374
 375     if(DecrementRef(&icond->wait_count) == 0 && res == WAIT_OBJECT_0+BROADCAST)
 376         ResetEvent(icond->events[BROADCAST]);
 377     EnterCriticalSection(mtx);
 378
 379     return (res == WAIT_TIMEOUT) ? althrd_timedout : althrd_success;
 380 }
 381
 382 void alcnd_destroy(alcnd_t *cond)
 383 {
 384     _int_alcnd_t *icond = cond->Ptr;
 385     CloseHandle(icond->events[SIGNAL]);
 386     CloseHandle(icond->events[BROADCAST]);
 387     free(icond);
 388 }
 389 #endif /* defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0600 */
 390
 391
 392 /* An associative map of uint:void* pairs. The key is the TLS index (given by
 393  * TlsAlloc), and the value is the altss_dtor_t callback. When a thread exits,
 394  * we iterate over the TLS indices for their thread-local value and call the
 395  * destructor function with it if they're both not NULL. To avoid using
 396  * DllMain, a PIMAGE_TLS_CALLBACK function pointer is placed in a ".CRT$XLx"
 397  * section (where x is a character A to Z) which will be called by the CRT.
 398  */
 399 static UIntMap TlsDestructors = UINTMAP_STATIC_INITIALIZE;
 400
 401 static void NTAPI altss_callback(void* UNUSED(handle), DWORD reason, void* UNUSED(reserved))
 402 {
 403     ALsizei i;
 404
 405     if(reason == DLL_PROCESS_DETACH)
 406     {
 407         ResetUIntMap(&TlsDestructors);
 408         return;
 409     }
 410     if(reason != DLL_THREAD_DETACH)
 411         return;
 412
 413     LockUIntMapRead(&TlsDestructors);
 414     for(i = 0;i < TlsDestructors.size;i++)
 415     {
 416         void *ptr = altss_get(TlsDestructors.array[i].key);
 417         altss_dtor_t callback = (altss_dtor_t)TlsDestructors.array[i].value;
 418         if(ptr && callback)
 419             callback(ptr);
 420     }
 421     UnlockUIntMapRead(&TlsDestructors);
 422 }
 423 #ifdef _MSC_VER
 424 #pragma section(".CRT$XLB",read)
 425 __declspec(allocate(".CRT$XLB")) PIMAGE_TLS_CALLBACK altss_callback_ = altss_callback;
 426 #elif defined(__GNUC__)
 427 PIMAGE_TLS_CALLBACK altss_callback_ __attribute__((section(".CRT$XLB"))) = altss_callback;
 428 #else
 429 #warning "No TLS callback support, thread-local contexts may leak references on poorly written applications."
 430 PIMAGE_TLS_CALLBACK altss_callback_ = altss_callback;
 431 #endif
 432
 433 int altss_create(altss_t *tss_id, altss_dtor_t callback)
 434 {
 435     DWORD key = TlsAlloc();
 436     if(key == TLS_OUT_OF_INDEXES)
 437         return althrd_error;
 438
 439     *tss_id = key;
 440     if(callback != NULL)
 441         InsertUIntMapEntry(&TlsDestructors, key, callback);
 442     return althrd_success;
 443 }
 444
 445 void altss_delete(altss_t tss_id)
 446 {
 447     RemoveUIntMapKey(&TlsDestructors, tss_id);
 448     TlsFree(tss_id);
 449 }
 450
 451
 452 int altimespec_get(struct timespec *ts, int base)
 453 {
 454     static_assert(sizeof(FILETIME) == sizeof(ULARGE_INTEGER),
 455                   "Size of FILETIME does not match ULARGE_INTEGER");
 456     if(base == AL_TIME_UTC)
 457     {
 458         union {
 459             FILETIME ftime;
 460             ULARGE_INTEGER ulint;
 461         } systime;
 462         GetSystemTimeAsFileTime(&systime.ftime);
 463         /* FILETIME is in 100-nanosecond units, or 1/10th of a microsecond. */
 464         ts->tv_sec = systime.ulint.QuadPart/10000000;
 465         ts->tv_nsec = (systime.ulint.QuadPart%10000000) * 100;
 466         return base;
 467     }
 468
 469     return 0;
 470 }
 471
 472
 473 void alcall_once(alonce_flag *once, void (*callback)(void))
 474 {
 475     LONG ret;
 476     while((ret=InterlockedExchange(once, 1)) == 1)
 477         althrd_yield();
 478     if(ret == 0)
 479         (*callback)();
 480     InterlockedExchange(once, 2);
 481 }
 482
 483 #else
 484
 485 #include <sys/time.h>
 486 #include <unistd.h>
 487 #include <pthread.h>
 488 #ifdef HAVE_PTHREAD_NP_H
 489 #include <pthread_np.h>
 490 #endif
 491
 492
 493 extern inline int althrd_sleep(const struct timespec *ts, struct timespec *rem);
 494 extern inline void alcall_once(alonce_flag *once, void (*callback)(void));
 495
 496
 497 void althrd_setname(althrd_t thr, const char *name)
 498 {
 499 #if defined(HAVE_PTHREAD_SETNAME_NP)
 500 #if defined(__GNUC__)
 501     pthread_setname_np(thr, name);
 502 #elif defined(__APPLE__)
 503     if(althrd_equal(thr, althrd_current())
 504         pthread_setname_np(name);
 505 #endif
 506 #elif defined(HAVE_PTHREAD_SET_NAME_NP)
 507     pthread_set_name_np(thr, name);
 508 #else
 509     (void)thr;
 510     (void)name;
 511 #endif
 512 }
 513
 514
 515 typedef struct thread_cntr {
 516     althrd_start_t func;
 517     void *arg;
 518 } thread_cntr;
 519
 520 static void *althrd_starter(void *arg)
 521 {
 522     thread_cntr cntr;
 523     memcpy(&cntr, arg, sizeof(cntr));
 524     free(arg);
 525
 526     return (void*)(intptr_t)((*cntr.func)(cntr.arg));
 527 }
 528
 529
 530 int althrd_create(althrd_t *thr, althrd_start_t func, void *arg)
 531 {
 532     thread_cntr *cntr;
 533     pthread_attr_t attr;
 534
 535     cntr = malloc(sizeof(*cntr));
 536     if(!cntr) return althrd_nomem;
 537
 538     if(pthread_attr_init(&attr) != 0)
 539     {
 540         free(cntr);
 541         return althrd_error;
 542     }
 543     if(pthread_attr_setstacksize(&attr, THREAD_STACK_SIZE) != 0)
 544     {
 545         pthread_attr_destroy(&attr);
 546         free(cntr);
 547         return althrd_error;
 548     }
 549
 550     cntr->func = func;
 551     cntr->arg = arg;
 552     if(pthread_create(thr, &attr, althrd_starter, cntr) != 0)
 553     {
 554         pthread_attr_destroy(&attr);
 555         free(cntr);
 556         return althrd_error;
 557     }
 558     pthread_attr_destroy(&attr);
 559
 560     return althrd_success;
 561 }
 562
 563 int althrd_detach(althrd_t thr)
 564 {
 565     if(pthread_detach(thr) != 0)
 566         return althrd_error;
 567     return althrd_success;
 568 }
 569
 570 int althrd_join(althrd_t thr, int *res)
 571 {
 572     void *code;
 573
 574     if(pthread_join(thr, &code) != 0)
 575         return althrd_error;
 576     if(res != NULL)
 577         *res = (int)(intptr_t)code;
 578     return althrd_success;
 579 }
 580
 581
 582 int almtx_init(almtx_t *mtx, int type)
 583 {
 584     int ret;
 585
 586     if(!mtx) return althrd_error;
 587     if((type&~(almtx_recursive|almtx_timed)) != 0)
 588         return althrd_error;
 589
 590     type &= ~almtx_timed;
 591     if(type == almtx_plain)
 592         ret = pthread_mutex_init(mtx, NULL);
 593     else
 594     {
 595         pthread_mutexattr_t attr;
 596
 597         ret = pthread_mutexattr_init(&attr);
 598         if(ret) return althrd_error;
 599
 600         if(type == almtx_recursive)
 601         {
 602             ret = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
 603 #ifdef HAVE_PTHREAD_MUTEXATTR_SETKIND_NP
 604             if(ret != 0)
 605                 ret = pthread_mutexattr_setkind_np(&attr, PTHREAD_MUTEX_RECURSIVE);
 606 #endif
 607         }
 608         else
 609             ret = 1;
 610         if(ret == 0)
 611             ret = pthread_mutex_init(mtx, &attr);
 612         pthread_mutexattr_destroy(&attr);
 613     }
 614     return ret ? althrd_error : althrd_success;
 615 }
 616
 617 void almtx_destroy(almtx_t *mtx)
 618 {
 619     pthread_mutex_destroy(mtx);
 620 }
 621
 622 int almtx_timedlock(almtx_t *mtx, const struct timespec *ts)
 623 {
 624     int ret;
 625
 626 #ifdef HAVE_PTHREAD_MUTEX_TIMEDLOCK
 627     ret = pthread_mutex_timedlock(mtx, ts);
 628     switch(ret)
 629     {
 630         case 0: return althrd_success;
 631         case ETIMEDOUT: return althrd_timedout;
 632         case EBUSY: return althrd_busy;
 633     }
 634     return althrd_error;
 635 #else
 636     if(!mtx || !ts)
 637         return althrd_error;
 638
 639     while((ret=almtx_trylock(mtx)) == althrd_busy)
 640     {
 641         struct timespec now;
 642
 643         if(ts->tv_sec < 0 || ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000 ||
 644            altimespec_get(&now, AL_TIME_UTC) != AL_TIME_UTC)
 645             return althrd_error;
 646         if(now.tv_sec > ts->tv_sec || (now.tv_sec == ts->tv_sec && now.tv_nsec >= ts->tv_nsec))
 647             return althrd_timedout;
 648
 649         althrd_yield();
 650     }
 651
 652     return ret;
 653 #endif
 654 }
 655
 656 int alcnd_init(alcnd_t *cond)
 657 {
 658     if(pthread_cond_init(cond, NULL) == 0)
 659         return althrd_success;
 660     return althrd_error;
 661 }
 662
 663 int alcnd_signal(alcnd_t *cond)
 664 {
 665     if(pthread_cond_signal(cond) == 0)
 666         return althrd_success;
 667     return althrd_error;
 668 }
 669
 670 int alcnd_broadcast(alcnd_t *cond)
 671 {
 672     if(pthread_cond_broadcast(cond) == 0)
 673         return althrd_success;
 674     return althrd_error;
 675 }
 676
 677 int alcnd_wait(alcnd_t *cond, almtx_t *mtx)
 678 {
 679     if(pthread_cond_wait(cond, mtx) == 0)
 680         return althrd_success;
 681     return althrd_error;
 682 }
 683
 684 int alcnd_timedwait(alcnd_t *cond, almtx_t *mtx, const struct timespec *time_point)
 685 {
 686     if(pthread_cond_timedwait(cond, mtx, time_point) == 0)
 687         return althrd_success;
 688     return althrd_error;
 689 }
 690
 691 void alcnd_destroy(alcnd_t *cond)
 692 {
 693     pthread_cond_destroy(cond);
 694 }
 695
 696
 697 int altss_create(altss_t *tss_id, altss_dtor_t callback)
 698 {
 699     if(pthread_key_create(tss_id, callback) != 0)
 700         return althrd_error;
 701     return althrd_success;
 702 }
 703
 704 void altss_delete(altss_t tss_id)
 705 {
 706     pthread_key_delete(tss_id);
 707 }
 708
 709
 710 int altimespec_get(struct timespec *ts, int base)
 711 {
 712     if(base == AL_TIME_UTC)
 713     {
 714         int ret;
 715 #if _POSIX_TIMERS > 0
 716         ret = clock_gettime(CLOCK_REALTIME, ts);
 717         if(ret == 0) return base;
 718 #else /* _POSIX_TIMERS > 0 */
 719         struct timeval tv;
 720         ret = gettimeofday(&tv, NULL);
 721         if(ret == 0)
 722         {
 723             ts->tv_sec = tv.tv_sec;
 724             ts->tv_nsec = tv.tv_usec * 1000;
 725             return base;
 726         }
 727 #endif
 728     }
 729
 730     return 0;
 731 }
 732
 733 #endif
 734
 735
 736 void al_nssleep(unsigned long nsec)
 737 {
 738     struct timespec ts, rem;
 739     ts.tv_sec = nsec / 1000000000ul;
 740     ts.tv_nsec = nsec % 1000000000ul;
 741
 742     while(althrd_sleep(&ts, &rem) == -1)
 743         ts = rem;
 744 }