dlls/msvcrt/lock.c

   1 /*
   2  * Copyright (c) 2002, TransGaming Technologies Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 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  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include "config.h"
  20 #include "wine/port.h"
  21
  22 #include <stdarg.h>
  23
  24 #include "wine/debug.h"
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "winternl.h"
  28 #include "msvcrt.h"
  29 #include "cppexcept.h"
  30 #include "mtdll.h"
  31 #include "cxx.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
  34
  35 typedef struct
  36 {
  37   BOOL             bInit;
  38   CRITICAL_SECTION crit;
  39 } LOCKTABLEENTRY;
  40
  41 static LOCKTABLEENTRY lock_table[ _TOTAL_LOCKS ];
  42
  43 static inline void msvcrt_mlock_set_entry_initialized( int locknum, BOOL initialized )
  44 {
  45   lock_table[ locknum ].bInit = initialized;
  46 }
  47
  48 static inline void msvcrt_initialize_mlock( int locknum )
  49 {
  50   InitializeCriticalSection( &(lock_table[ locknum ].crit) );
  51   lock_table[ locknum ].crit.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": LOCKTABLEENTRY.crit");
  52   msvcrt_mlock_set_entry_initialized( locknum, TRUE );
  53 }
  54
  55 static inline void msvcrt_uninitialize_mlock( int locknum )
  56 {
  57   lock_table[ locknum ].crit.DebugInfo->Spare[0] = 0;
  58   DeleteCriticalSection( &(lock_table[ locknum ].crit) );
  59   msvcrt_mlock_set_entry_initialized( locknum, FALSE );
  60 }
  61
  62 /**********************************************************************
  63  *     msvcrt_init_mt_locks (internal)
  64  *
  65  * Initialize the table lock. All other locks will be initialized
  66  * upon first use.
  67  *
  68  */
  69 void msvcrt_init_mt_locks(void)
  70 {
  71   int i;
  72
  73   TRACE( "initializing mtlocks\n" );
  74
  75   /* Initialize the table */
  76   for( i=0; i < _TOTAL_LOCKS; i++ )
  77   {
  78     msvcrt_mlock_set_entry_initialized( i, FALSE );
  79   }
  80
  81   /* Initialize our lock table lock */
  82   msvcrt_initialize_mlock( _LOCKTAB_LOCK );
  83 }
  84
  85 /**********************************************************************
  86  *              _lock (MSVCRT.@)
  87  */
  88 void CDECL _lock( int locknum )
  89 {
  90   TRACE( "(%d)\n", locknum );
  91
  92   /* If the lock doesn't exist yet, create it */
  93   if( lock_table[ locknum ].bInit == FALSE )
  94   {
  95     /* Lock while we're changing the lock table */
  96     _lock( _LOCKTAB_LOCK );
  97
  98     /* Check again if we've got a bit of a race on lock creation */
  99     if( lock_table[ locknum ].bInit == FALSE )
 100     {
 101       TRACE( ": creating lock #%d\n", locknum );
 102       msvcrt_initialize_mlock( locknum );
 103     }
 104
 105     /* Unlock ourselves */
 106     _unlock( _LOCKTAB_LOCK );
 107   }
 108
 109   EnterCriticalSection( &(lock_table[ locknum ].crit) );
 110 }
 111
 112 /**********************************************************************
 113  *              _unlock (MSVCRT.@)
 114  *
 115  * NOTE: There is no error detection to make sure the lock exists and is acquired.
 116  */
 117 void CDECL _unlock( int locknum )
 118 {
 119   TRACE( "(%d)\n", locknum );
 120
 121   LeaveCriticalSection( &(lock_table[ locknum ].crit) );
 122 }
 123
 124 #if _MSVCR_VER >= 100
 125 typedef enum
 126 {
 127     SPINWAIT_INIT,
 128     SPINWAIT_SPIN,
 129     SPINWAIT_YIELD,
 130     SPINWAIT_DONE
 131 } SpinWait_state;
 132
 133 typedef void (__cdecl *yield_func)(void);
 134
 135 typedef struct
 136 {
 137     ULONG spin;
 138     ULONG unknown;
 139     SpinWait_state state;
 140     yield_func yield_func;
 141 } SpinWait;
 142
 143 /* ?_Value@_SpinCount@details@Concurrency@@SAIXZ */
 144 unsigned int __cdecl SpinCount__Value(void)
 145 {
 146     static unsigned int val = -1;
 147
 148     TRACE("()\n");
 149
 150     if(val == -1) {
 151         SYSTEM_INFO si;
 152
 153         GetSystemInfo(&si);
 154         val = si.dwNumberOfProcessors>1 ? 4000 : 0;
 155     }
 156
 157     return val;
 158 }
 159
 160 /* ??0?$_SpinWait@$00@details@Concurrency@@QAE@P6AXXZ@Z */
 161 /* ??0?$_SpinWait@$00@details@Concurrency@@QEAA@P6AXXZ@Z */
 162 DEFINE_THISCALL_WRAPPER(SpinWait_ctor_yield, 8)
 163 SpinWait*  __thiscall SpinWait_ctor_yield(SpinWait *this, yield_func yf)
 164 {
 165     TRACE("(%p %p)\n", this, yf);
 166
 167     this->state = SPINWAIT_INIT;
 168     this->unknown = 1;
 169     this->yield_func = yf;
 170     return this;
 171 }
 172
 173 /* ??0?$_SpinWait@$0A@@details@Concurrency@@QAE@P6AXXZ@Z */
 174 /* ??0?$_SpinWait@$0A@@details@Concurrency@@QEAA@P6AXXZ@Z */
 175 DEFINE_THISCALL_WRAPPER(SpinWait_ctor, 8)
 176 SpinWait* __thiscall SpinWait_ctor(SpinWait *this, yield_func yf)
 177 {
 178     TRACE("(%p %p)\n", this, yf);
 179
 180     this->state = SPINWAIT_INIT;
 181     this->unknown = 0;
 182     this->yield_func = yf;
 183     return this;
 184 }
 185
 186 /* ??_F?$_SpinWait@$00@details@Concurrency@@QAEXXZ */
 187 /* ??_F?$_SpinWait@$00@details@Concurrency@@QEAAXXZ */
 188 /* ??_F?$_SpinWait@$0A@@details@Concurrency@@QAEXXZ */
 189 /* ??_F?$_SpinWait@$0A@@details@Concurrency@@QEAAXXZ */
 190 DEFINE_THISCALL_WRAPPER(SpinWait_dtor, 4)
 191 void __thiscall SpinWait_dtor(SpinWait *this)
 192 {
 193     TRACE("(%p)\n", this);
 194 }
 195
 196 /* ?_DoYield@?$_SpinWait@$00@details@Concurrency@@IAEXXZ */
 197 /* ?_DoYield@?$_SpinWait@$00@details@Concurrency@@IEAAXXZ */
 198 /* ?_DoYield@?$_SpinWait@$0A@@details@Concurrency@@IAEXXZ */
 199 /* ?_DoYield@?$_SpinWait@$0A@@details@Concurrency@@IEAAXXZ */
 200 DEFINE_THISCALL_WRAPPER(SpinWait__DoYield, 4)
 201 void __thiscall SpinWait__DoYield(SpinWait *this)
 202 {
 203     TRACE("(%p)\n", this);
 204
 205     if(this->unknown)
 206         this->yield_func();
 207 }
 208
 209 /* ?_NumberOfSpins@?$_SpinWait@$00@details@Concurrency@@IAEKXZ */
 210 /* ?_NumberOfSpins@?$_SpinWait@$00@details@Concurrency@@IEAAKXZ */
 211 /* ?_NumberOfSpins@?$_SpinWait@$0A@@details@Concurrency@@IAEKXZ */
 212 /* ?_NumberOfSpins@?$_SpinWait@$0A@@details@Concurrency@@IEAAKXZ */
 213 DEFINE_THISCALL_WRAPPER(SpinWait__NumberOfSpins, 4)
 214 ULONG __thiscall SpinWait__NumberOfSpins(SpinWait *this)
 215 {
 216     TRACE("(%p)\n", this);
 217     return 1;
 218 }
 219
 220 /* ?_SetSpinCount@?$_SpinWait@$00@details@Concurrency@@QAEXI@Z */
 221 /* ?_SetSpinCount@?$_SpinWait@$00@details@Concurrency@@QEAAXI@Z */
 222 /* ?_SetSpinCount@?$_SpinWait@$0A@@details@Concurrency@@QAEXI@Z */
 223 /* ?_SetSpinCount@?$_SpinWait@$0A@@details@Concurrency@@QEAAXI@Z */
 224 DEFINE_THISCALL_WRAPPER(SpinWait__SetSpinCount, 8)
 225 void __thiscall SpinWait__SetSpinCount(SpinWait *this, unsigned int spin)
 226 {
 227     TRACE("(%p %d)\n", this, spin);
 228
 229     this->spin = spin;
 230     this->state = spin ? SPINWAIT_SPIN : SPINWAIT_YIELD;
 231 }
 232
 233 /* ?_Reset@?$_SpinWait@$00@details@Concurrency@@IAEXXZ */
 234 /* ?_Reset@?$_SpinWait@$00@details@Concurrency@@IEAAXXZ */
 235 /* ?_Reset@?$_SpinWait@$0A@@details@Concurrency@@IAEXXZ */
 236 /* ?_Reset@?$_SpinWait@$0A@@details@Concurrency@@IEAAXXZ */
 237 DEFINE_THISCALL_WRAPPER(SpinWait__Reset, 4)
 238 void __thiscall SpinWait__Reset(SpinWait *this)
 239 {
 240     SpinWait__SetSpinCount(this, SpinCount__Value());
 241 }
 242
 243 /* ?_ShouldSpinAgain@?$_SpinWait@$00@details@Concurrency@@IAE_NXZ */
 244 /* ?_ShouldSpinAgain@?$_SpinWait@$00@details@Concurrency@@IEAA_NXZ */
 245 /* ?_ShouldSpinAgain@?$_SpinWait@$0A@@details@Concurrency@@IAE_NXZ */
 246 /* ?_ShouldSpinAgain@?$_SpinWait@$0A@@details@Concurrency@@IEAA_NXZ */
 247 DEFINE_THISCALL_WRAPPER(SpinWait__ShouldSpinAgain, 4)
 248 MSVCRT_bool __thiscall SpinWait__ShouldSpinAgain(SpinWait *this)
 249 {
 250     TRACE("(%p)\n", this);
 251
 252     this->spin--;
 253     return this->spin > 0;
 254 }
 255
 256 /* ?_SpinOnce@?$_SpinWait@$00@details@Concurrency@@QAE_NXZ */
 257 /* ?_SpinOnce@?$_SpinWait@$00@details@Concurrency@@QEAA_NXZ */
 258 /* ?_SpinOnce@?$_SpinWait@$0A@@details@Concurrency@@QAE_NXZ */
 259 /* ?_SpinOnce@?$_SpinWait@$0A@@details@Concurrency@@QEAA_NXZ */
 260 DEFINE_THISCALL_WRAPPER(SpinWait__SpinOnce, 4)
 261 MSVCRT_bool __thiscall SpinWait__SpinOnce(SpinWait *this)
 262 {
 263     switch(this->state) {
 264     case SPINWAIT_INIT:
 265         SpinWait__Reset(this);
 266         /* fall through */
 267     case SPINWAIT_SPIN:
 268 #ifdef __i386__
 269         __asm__ __volatile__( "rep;nop" : : : "memory" );
 270 #else
 271         __asm__ __volatile__( "" : : : "memory" );
 272 #endif
 273
 274         this->spin--;
 275         if(!this->spin)
 276             this->state = this->unknown ? SPINWAIT_YIELD : SPINWAIT_DONE;
 277         return TRUE;
 278     case SPINWAIT_YIELD:
 279         this->state = SPINWAIT_DONE;
 280         this->yield_func();
 281         return TRUE;
 282     default:
 283         SpinWait__Reset(this);
 284         return FALSE;
 285     }
 286 }
 287
 288 static HANDLE keyed_event;
 289
 290 /* keep in sync with msvcp90/msvcp90.h */
 291 typedef struct cs_queue
 292 {
 293     struct cs_queue *next;
 294 #if _MSVCR_VER >= 110
 295     BOOL free;
 296     int unknown;
 297 #endif
 298 } cs_queue;
 299
 300 typedef struct
 301 {
 302     ULONG_PTR unk_thread_id;
 303     cs_queue unk_active;
 304 #if _MSVCR_VER >= 110
 305     void *unknown[2];
 306 #else
 307     void *unknown[1];
 308 #endif
 309     cs_queue *head;
 310     void *tail;
 311 } critical_section;
 312
 313 /* ??0critical_section@Concurrency@@QAE@XZ */
 314 /* ??0critical_section@Concurrency@@QEAA@XZ */
 315 DEFINE_THISCALL_WRAPPER(critical_section_ctor, 4)
 316 critical_section* __thiscall critical_section_ctor(critical_section *this)
 317 {
 318     TRACE("(%p)\n", this);
 319
 320     if(!keyed_event) {
 321         HANDLE event;
 322
 323         NtCreateKeyedEvent(&event, GENERIC_READ|GENERIC_WRITE, NULL, 0);
 324         if(InterlockedCompareExchangePointer(&keyed_event, event, NULL) != NULL)
 325             NtClose(event);
 326     }
 327
 328     this->unk_thread_id = 0;
 329     this->head = this->tail = NULL;
 330     return this;
 331 }
 332
 333 /* ??1critical_section@Concurrency@@QAE@XZ */
 334 /* ??1critical_section@Concurrency@@QEAA@XZ */
 335 DEFINE_THISCALL_WRAPPER(critical_section_dtor, 4)
 336 void __thiscall critical_section_dtor(critical_section *this)
 337 {
 338     TRACE("(%p)\n", this);
 339 }
 340
 341 static void __cdecl spin_wait_yield(void)
 342 {
 343     Sleep(0);
 344 }
 345
 346 static inline void spin_wait_for_next_cs(cs_queue *q)
 347 {
 348     SpinWait sw;
 349
 350     if(q->next) return;
 351
 352     SpinWait_ctor(&sw, &spin_wait_yield);
 353     SpinWait__Reset(&sw);
 354     while(!q->next)
 355         SpinWait__SpinOnce(&sw);
 356     SpinWait_dtor(&sw);
 357 }
 358
 359 static inline void cs_set_head(critical_section *cs, cs_queue *q)
 360 {
 361     cs->unk_thread_id = GetCurrentThreadId();
 362     cs->unk_active.next = q->next;
 363     cs->head = &cs->unk_active;
 364 }
 365
 366 /* ?lock@critical_section@Concurrency@@QAEXXZ */
 367 /* ?lock@critical_section@Concurrency@@QEAAXXZ */
 368 DEFINE_THISCALL_WRAPPER(critical_section_lock, 4)
 369 void __thiscall critical_section_lock(critical_section *this)
 370 {
 371     cs_queue q, *last;
 372
 373     TRACE("(%p)\n", this);
 374
 375     if(this->unk_thread_id == GetCurrentThreadId()) {
 376         FIXME("throw exception\n");
 377         return;
 378     }
 379
 380     memset(&q, 0, sizeof(q));
 381     last = InterlockedExchangePointer(&this->tail, &q);
 382     if(last) {
 383         last->next = &q;
 384         NtWaitForKeyedEvent(keyed_event, &q, 0, NULL);
 385     }
 386
 387     cs_set_head(this, &q);
 388     if(InterlockedCompareExchangePointer(&this->tail, &this->unk_active, &q) != &q) {
 389         spin_wait_for_next_cs(&q);
 390         this->unk_active.next = q.next;
 391     }
 392 }
 393
 394 /* ?try_lock@critical_section@Concurrency@@QAE_NXZ */
 395 /* ?try_lock@critical_section@Concurrency@@QEAA_NXZ */
 396 DEFINE_THISCALL_WRAPPER(critical_section_try_lock, 4)
 397 MSVCRT_bool __thiscall critical_section_try_lock(critical_section *this)
 398 {
 399     cs_queue q;
 400
 401     TRACE("(%p)\n", this);
 402
 403     if(this->unk_thread_id == GetCurrentThreadId()) {
 404         FIXME("throw exception\n");
 405         return FALSE;
 406     }
 407
 408     memset(&q, 0, sizeof(q));
 409     if(!InterlockedCompareExchangePointer(&this->tail, &q, NULL)) {
 410         cs_set_head(this, &q);
 411         if(InterlockedCompareExchangePointer(&this->tail, &this->unk_active, &q) != &q) {
 412             spin_wait_for_next_cs(&q);
 413             this->unk_active.next = q.next;
 414         }
 415         return TRUE;
 416     }
 417     return FALSE;
 418 }
 419
 420 /* ?unlock@critical_section@Concurrency@@QAEXXZ */
 421 /* ?unlock@critical_section@Concurrency@@QEAAXXZ */
 422 DEFINE_THISCALL_WRAPPER(critical_section_unlock, 4)
 423 void __thiscall critical_section_unlock(critical_section *this)
 424 {
 425     TRACE("(%p)\n", this);
 426
 427     this->unk_thread_id = 0;
 428     this->head = NULL;
 429     if(InterlockedCompareExchangePointer(&this->tail, NULL, &this->unk_active)
 430             == &this->unk_active) return;
 431     spin_wait_for_next_cs(&this->unk_active);
 432
 433 #if _MSVCR_VER >= 110
 434     while(1) {
 435         cs_queue *next;
 436
 437         if(!InterlockedExchange(&this->unk_active.next->free, TRUE))
 438             break;
 439
 440         next = this->unk_active.next;
 441         if(InterlockedCompareExchangePointer(&this->tail, NULL, next) == next) {
 442             HeapFree(GetProcessHeap(), 0, next);
 443             return;
 444         }
 445         spin_wait_for_next_cs(next);
 446
 447         this->unk_active.next = next->next;
 448         HeapFree(GetProcessHeap(), 0, next);
 449     }
 450 #endif
 451
 452     NtReleaseKeyedEvent(keyed_event, this->unk_active.next, 0, NULL);
 453 }
 454
 455 /* ?native_handle@critical_section@Concurrency@@QAEAAV12@XZ */
 456 /* ?native_handle@critical_section@Concurrency@@QEAAAEAV12@XZ */
 457 DEFINE_THISCALL_WRAPPER(critical_section_native_handle, 4)
 458 critical_section* __thiscall critical_section_native_handle(critical_section *this)
 459 {
 460     TRACE("(%p)\n", this);
 461     return this;
 462 }
 463
 464 #if _MSVCR_VER >= 110
 465 /* ?try_lock_for@critical_section@Concurrency@@QAE_NI@Z */
 466 /* ?try_lock_for@critical_section@Concurrency@@QEAA_NI@Z */
 467 DEFINE_THISCALL_WRAPPER(critical_section_try_lock_for, 8)
 468 MSVCRT_bool __thiscall critical_section_try_lock_for(
 469         critical_section *this, unsigned int timeout)
 470 {
 471     cs_queue *q, *last;
 472
 473     TRACE("(%p %d)\n", this, timeout);
 474
 475     if(this->unk_thread_id == GetCurrentThreadId()) {
 476         FIXME("throw exception\n");
 477         return FALSE;
 478     }
 479
 480     if(!(q = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*q))))
 481         return critical_section_try_lock(this);
 482
 483     last = InterlockedExchangePointer(&this->tail, q);
 484     if(last) {
 485         LARGE_INTEGER to;
 486         NTSTATUS status;
 487         FILETIME ft;
 488
 489         last->next = q;
 490         GetSystemTimeAsFileTime(&ft);
 491         to.QuadPart = ((LONGLONG)ft.dwHighDateTime<<32) +
 492             ft.dwLowDateTime + (LONGLONG)timeout*10000;
 493         status = NtWaitForKeyedEvent(keyed_event, q, 0, &to);
 494         if(status == STATUS_TIMEOUT) {
 495             if(!InterlockedExchange(&q->free, TRUE))
 496                 return FALSE;
 497             /* A thread has signaled the event and is block waiting. */
 498             /* We need to catch the event to wake the thread.        */
 499             NtWaitForKeyedEvent(keyed_event, q, 0, NULL);
 500         }
 501     }
 502
 503     cs_set_head(this, q);
 504     if(InterlockedCompareExchangePointer(&this->tail, &this->unk_active, q) != q) {
 505         spin_wait_for_next_cs(q);
 506         this->unk_active.next = q->next;
 507     }
 508
 509     HeapFree(GetProcessHeap(), 0, q);
 510     return TRUE;
 511 }
 512 #endif
 513
 514 typedef struct
 515 {
 516     critical_section *cs;
 517     void *unknown[3];
 518 } critical_section_scoped_lock;
 519
 520 /* ??0scoped_lock@critical_section@Concurrency@@QAE@AAV12@@Z */
 521 /* ??0scoped_lock@critical_section@Concurrency@@QEAA@AEAV12@@Z */
 522 DEFINE_THISCALL_WRAPPER(critical_section_scoped_lock_ctor, 8)
 523 critical_section_scoped_lock* __thiscall critical_section_scoped_lock_ctor(
 524         critical_section_scoped_lock *this, critical_section *cs)
 525 {
 526     TRACE("(%p %p)\n", this, cs);
 527     this->cs = cs;
 528     critical_section_lock(this->cs);
 529     return this;
 530 }
 531
 532 /* ??1scoped_lock@critical_section@Concurrency@@QAE@XZ */
 533 /* ??1scoped_lock@critical_section@Concurrency@@QEAA@XZ */
 534 DEFINE_THISCALL_WRAPPER(critical_section_scoped_lock_dtor, 4)
 535 void __thiscall critical_section_scoped_lock_dtor(critical_section_scoped_lock *this)
 536 {
 537     TRACE("(%p)\n", this);
 538     critical_section_unlock(this->cs);
 539 }
 540
 541 /* ?_GetConcurrency@details@Concurrency@@YAIXZ */
 542 unsigned int __cdecl _GetConcurrency(void)
 543 {
 544     static unsigned int val = -1;
 545
 546     TRACE("()\n");
 547
 548     if(val == -1) {
 549         SYSTEM_INFO si;
 550
 551         GetSystemInfo(&si);
 552         val = si.dwNumberOfProcessors;
 553     }
 554
 555     return val;
 556 }
 557
 558 #endif
 559
 560 /**********************************************************************
 561  *     msvcrt_free_locks (internal)
 562  *
 563  * Uninitialize all mt locks. Assume that neither _lock or _unlock will
 564  * be called once we're calling this routine (ie _LOCKTAB_LOCK can be deleted)
 565  *
 566  */
 567 void msvcrt_free_locks(void)
 568 {
 569   int i;
 570
 571   TRACE( ": uninitializing all mtlocks\n" );
 572
 573   /* Uninitialize the table */
 574   for( i=0; i < _TOTAL_LOCKS; i++ )
 575   {
 576     if( lock_table[ i ].bInit )
 577     {
 578       msvcrt_uninitialize_mlock( i );
 579     }
 580   }
 581
 582 #if _MSVCR_VER >= 100
 583   if(keyed_event)
 584       NtClose(keyed_event);
 585 #endif
 586 }