Kernel/threads.c

   1 /*
   2  * Acess2
   3  * threads.c
   4  * - Common Thread Control
   5  */
   6 #include <acess.h>
   7 #include <threads.h>
   8 #include <errno.h>
   9 #include <semaphore.h>
  10
  11 // Configuration
  12 #define DEBUG_TRACE_TICKETS     0       // Trace ticket counts
  13 #define DEBUG_TRACE_STATE       0       // Trace state changes (sleep/wake)
  14
  15 // --- Schedulers ---
  16 #define SCHED_UNDEF     0
  17 #define SCHED_LOTTERY   1       // Lottery scheduler
  18 #define SCHED_RR_SIM    2       // Single Queue Round Robin
  19 #define SCHED_RR_PRI    3       // Multi Queue Round Robin
  20 // Set scheduler type
  21 #define SCHEDULER_TYPE  SCHED_LOTTERY
  22
  23 // === CONSTANTS ===
  24 #define DEFAULT_QUANTUM 10
  25 #define DEFAULT_PRIORITY        5
  26 #define MIN_PRIORITY            10
  27 const enum eConfigTypes cCONFIG_TYPES[] = {
  28         CFGT_HEAPSTR,   // e.g. CFG_VFS_CWD
  29         CFGT_INT,       // e.g. CFG_VFS_MAXFILES
  30         CFGT_NULL
  31 };
  32
  33 // === IMPORTS ===
  34 extern void     ArchThreads_Init(void);
  35 extern void     Proc_CallFaultHandler(tThread *Thread);
  36 extern void     Proc_DumpThreadCPUState(tThread *Thread);
  37 extern int      GetCPUNum(void);
  38
  39 // === PROTOTYPES ===
  40 void    Threads_Init(void);
  41 #if 0
  42  int    Threads_SetName(const char *NewName);
  43 #endif
  44 char    *Threads_GetName(int ID);
  45 #if 0
  46 void    Threads_SetPriority(tThread *Thread, int Pri);
  47 tThread *Threads_CloneTCB(Uint *Err, Uint Flags);
  48  int    Threads_WaitTID(int TID, int *status);
  49 tThread *Threads_GetThread(Uint TID);
  50 #endif
  51 void    Threads_AddToDelete(tThread *Thread);
  52 tThread *Threads_int_DelFromQueue(tThread **List, tThread *Thread);
  53 #if 0
  54 void    Threads_Exit(int TID, int Status);
  55 void    Threads_Kill(tThread *Thread, int Status);
  56 void    Threads_Yield(void);
  57 void    Threads_Sleep(void);
  58  int    Threads_Wake(tThread *Thread);
  59 void    Threads_AddActive(tThread *Thread);
  60 tThread *Threads_RemActive(void);
  61 #endif
  62 void    Threads_ToggleTrace(int TID);
  63 void    Threads_Fault(int Num);
  64 void    Threads_SegFault(tVAddr Addr);
  65 #if 0
  66  int    Threads_GetPID(void);
  67  int    Threads_GetTID(void);
  68 tUID    Threads_GetUID(void);
  69 tGID    Threads_GetGID(void);
  70  int    Threads_SetUID(Uint *Errno, tUID ID);
  71  int    Threads_SetGID(Uint *Errno, tUID ID);
  72 #endif
  73 void    Threads_Dump(void);
  74 void    Threads_DumpActive(void);
  75 #if 0
  76  int    Mutex_Acquire(tMutex *Mutex);
  77 void    Mutex_Release(tMutex *Mutex);
  78  int    Mutex_IsLocked(tMutex *Mutex);
  79 #endif
  80
  81 // === GLOBALS ===
  82 // -- Core Thread --
  83 // Only used for the core kernel
  84 tThread gThreadZero = {
  85         .Status         = THREAD_STAT_ACTIVE,   // Status
  86         .ThreadName     = (char*)"ThreadZero",  // Name
  87         .Quantum        = DEFAULT_QUANTUM,      // Default Quantum
  88         .Remaining      = DEFAULT_QUANTUM,      // Current Quantum
  89         .Priority       = DEFAULT_PRIORITY      // Number of tickets
  90         };
  91 // -- Processes --
  92 // --- Locks ---
  93 tShortSpinlock  glThreadListLock;       ///\note NEVER use a heap function while locked
  94 // --- Current State ---
  95 volatile int    giNumActiveThreads = 0; // Number of threads on the active queue
  96 volatile Uint   giNextTID = 1;  // Next TID to allocate
  97 // --- Thread Lists ---
  98 tThread *gAllThreads = NULL;            // All allocated threads
  99 tThread *gSleepingThreads = NULL;       // Sleeping Threads
 100 tThread *gDeleteThreads = NULL;         // Threads to delete
 101  int    giNumCPUs = 1;  // Number of CPUs
 102 BOOL     gaThreads_NoTaskSwitch[MAX_CPUS];      // Disables task switches for each core (Pseudo-IF)
 103 // --- Scheduler Types ---
 104 #if SCHEDULER_TYPE == SCHED_LOTTERY
 105 const int       caiTICKET_COUNTS[MIN_PRIORITY+1] = {100,81,64,49,36,25,16,9,4,1,0};
 106 volatile int    giFreeTickets = 0;      // Number of tickets held by non-scheduled threads
 107 tThread *gActiveThreads = NULL;         // Currently Running Threads
 108 #elif SCHEDULER_TYPE == SCHED_RR_SIM
 109 tThread *gActiveThreads = NULL;         // Currently Running Threads
 110 #elif SCHEDULER_TYPE == SCHED_RR_PRI
 111 tThread *gaActiveThreads[MIN_PRIORITY+1];       // Active threads for each priority level
 112 #else
 113 # error "Unkown scheduler type"
 114 #endif
 115
 116 // === CODE ===
 117 /**
 118  * \fn void Threads_Init(void)
 119  * \brief Initialse the thread list
 120  */
 121 void Threads_Init(void)
 122 {
 123         ArchThreads_Init();
 124
 125         Log_Debug("Threads", "Offsets of tThread");
 126         Log_Debug("Threads", ".Priority = %i", offsetof(tThread, Priority));
 127
 128         // Create Initial Task
 129         #if SCHEDULER_TYPE == SCHED_RR_PRI
 130         gaActiveThreads[gThreadZero.Priority] = &gThreadZero;
 131         #else
 132         gActiveThreads = &gThreadZero;
 133         #endif
 134
 135         gAllThreads = &gThreadZero;
 136         giNumActiveThreads = 1;
 137
 138         Proc_Start();
 139 }
 140
 141 /**
 142  * \fn void Threads_SetName(const char *NewName)
 143  * \brief Sets the current thread's name
 144  * \param NewName       New name for the thread
 145  * \return Boolean Failure
 146  */
 147 int Threads_SetName(const char *NewName)
 148 {
 149         tThread *cur = Proc_GetCurThread();
 150         char    *oldname = cur->ThreadName;
 151
 152         // NOTE: There is a possibility of non-thread safety here
 153         // A thread could read the current name pointer before it is zeroed
 154
 155         cur->ThreadName = NULL;
 156
 157         if( IsHeap(oldname) )   free( oldname );
 158
 159         cur->ThreadName = strdup(NewName);
 160         return 0;
 161 }
 162
 163 /**
 164  * \fn char *Threads_GetName(int ID)
 165  * \brief Gets a thread's name
 166  * \param ID    Thread ID (-1 indicates current thread)
 167  * \return Pointer to name
 168  * \retval NULL Failure
 169  */
 170 char *Threads_GetName(tTID ID)
 171 {
 172         if(ID == -1) {
 173                 return Proc_GetCurThread()->ThreadName;
 174         }
 175         return Threads_GetThread(ID)->ThreadName;
 176 }
 177
 178 /**
 179  * \fn void Threads_SetPriority(tThread *Thread, int Pri)
 180  * \brief Sets the priority of a task
 181  * \param Thread        Thread to update ticket count (NULL means current thread)
 182  * \param Pri   New priority
 183  */
 184 void Threads_SetPriority(tThread *Thread, int Pri)
 185 {
 186         // Get current thread
 187         if(Thread == NULL)      Thread = Proc_GetCurThread();
 188         // Bounds checking
 189         // - If < 0, set to lowest priority
 190         // - Minumum priority is actualy a high number, 0 is highest
 191         if(Pri < 0)     Pri = MIN_PRIORITY;
 192         if(Pri > MIN_PRIORITY)  Pri = MIN_PRIORITY;
 193
 194         // Do we actually have to do anything?
 195         if( Pri == Thread->Priority )   return;
 196
 197         #if SCHEDULER_TYPE == SCHED_RR_PRI
 198         SHORTLOCK( &glThreadListLock );
 199         // Remove from old priority
 200         Threads_int_DelFromQueue( &gaActiveThreads[Thread->Priority], Thread );
 201         // And add to new
 202         Thread->Next = gaActiveThreads[Pri];
 203         gaActiveThreads[Pri] = Thread;
 204         Thread->Priority = Pri;
 205         SHORTREL( &glThreadListLock );
 206         #else
 207         // If this isn't the current thread, we need to lock
 208         if( Thread != Proc_GetCurThread() )
 209         {
 210                 SHORTLOCK( &glThreadListLock );
 211
 212                 #if SCHEDULER_TYPE == SCHED_LOTTERY
 213                 giFreeTickets -= caiTICKET_COUNTS[Thread->Priority] - caiTICKET_COUNTS[Pri];
 214                 # if DEBUG_TRACE_TICKETS
 215                 Log("Threads_SetTickets: new giFreeTickets = %i [-%i+%i]",
 216                         giFreeTickets,
 217                         caiTICKET_COUNTS[Thread->Priority], caiTICKET_COUNTS[Pri]);
 218                 # endif
 219                 #endif
 220                 Thread->Priority = Pri;
 221                 SHORTREL( &glThreadListLock );
 222         }
 223         else
 224                 Thread->Priority = Pri;
 225         #endif
 226
 227         #if DEBUG_TRACE_STATE
 228         Log("Threads_SetPriority: %p(%i %s) pri set %i",
 229                 Thread, Thread->TID, Thread->ThreadName,
 230                 Pri);
 231         #endif
 232 }
 233
 234 /**
 235  * \fn tThread *Threads_CloneTCB(Uint *Err, Uint Flags)
 236  * \brief Clone the TCB of the current thread
 237  * \param Err   Error pointer
 238  * \param Flags Flags for something... (What is this for?)
 239  */
 240 tThread *Threads_CloneTCB(Uint *Err, Uint Flags)
 241 {
 242         tThread *cur, *new;
 243          int    i;
 244         cur = Proc_GetCurThread();
 245
 246         // Allocate and duplicate
 247         new = malloc(sizeof(tThread));
 248         if(new == NULL) { *Err = -ENOMEM; return NULL; }
 249         memcpy(new, cur, sizeof(tThread));
 250
 251         new->CurCPU = -1;
 252         new->Next = NULL;
 253         memset( &new->IsLocked, 0, sizeof(new->IsLocked));
 254         new->Status = THREAD_STAT_PREINIT;
 255         new->RetStatus = 0;
 256
 257         // Get Thread ID
 258         new->TID = giNextTID++;
 259         new->Parent = cur;
 260         new->bInstrTrace = 0;
 261
 262         // Clone Name
 263         new->ThreadName = strdup(cur->ThreadName);
 264
 265         // Set Thread Group ID (PID)
 266         if(Flags & CLONE_VM)
 267                 new->TGID = new->TID;
 268         else
 269                 new->TGID = cur->TGID;
 270
 271         // Messages are not inherited
 272         new->Messages = NULL;
 273         new->LastMessage = NULL;
 274
 275         // Set State
 276         new->Remaining = new->Quantum = cur->Quantum;
 277         new->Priority = cur->Priority;
 278
 279         // Set Signal Handlers
 280         new->CurFaultNum = 0;
 281         new->FaultHandler = cur->FaultHandler;
 282
 283         for( i = 0; i < NUM_CFG_ENTRIES; i ++ )
 284         {
 285                 switch(cCONFIG_TYPES[i])
 286                 {
 287                 default:
 288                         new->Config[i] = cur->Config[i];
 289                         break;
 290                 case CFGT_HEAPSTR:
 291                         if(cur->Config[i])
 292                                 new->Config[i] = (Uint) strdup( (void*)cur->Config[i] );
 293                         else
 294                                 new->Config[i] = 0;
 295                         break;
 296                 }
 297         }
 298
 299         // Maintain a global list of threads
 300         SHORTLOCK( &glThreadListLock );
 301         new->GlobalPrev = NULL; // Protect against bugs
 302         new->GlobalNext = gAllThreads;
 303         gAllThreads->GlobalPrev = new;
 304         gAllThreads = new;
 305         SHORTREL( &glThreadListLock );
 306
 307         return new;
 308 }
 309
 310 /**
 311  * \fn tThread *Threads_CloneTCB(Uint *Err, Uint Flags)
 312  * \brief Clone the TCB of the current thread
 313  */
 314 tThread *Threads_CloneThreadZero(void)
 315 {
 316         tThread *cur, *new;
 317          int    i;
 318         cur = Proc_GetCurThread();
 319
 320         // Allocate and duplicate
 321         new = malloc(sizeof(tThread));
 322         if(new == NULL) {
 323                 return NULL;
 324         }
 325         memcpy(new, &gThreadZero, sizeof(tThread));
 326
 327         new->CurCPU = -1;
 328         new->Next = NULL;
 329         memset( &new->IsLocked, 0, sizeof(new->IsLocked));
 330         new->Status = THREAD_STAT_PREINIT;
 331         new->RetStatus = 0;
 332
 333         // Get Thread ID
 334         new->TID = giNextTID++;
 335         new->Parent = 0;
 336
 337         // Clone Name
 338         new->ThreadName = NULL;
 339
 340         // Messages are not inherited
 341         new->Messages = NULL;
 342         new->LastMessage = NULL;
 343
 344         // Set State
 345         new->Remaining = new->Quantum = cur->Quantum;
 346         new->Priority = cur->Priority;
 347         new->bInstrTrace = 0;
 348
 349         // Set Signal Handlers
 350         new->CurFaultNum = 0;
 351         new->FaultHandler = cur->FaultHandler;
 352
 353         for( i = 0; i < NUM_CFG_ENTRIES; i ++ )
 354         {
 355                 switch(cCONFIG_TYPES[i])
 356                 {
 357                 default:
 358                         new->Config[i] = cur->Config[i];
 359                         break;
 360                 case CFGT_HEAPSTR:
 361                         if(cur->Config[i])
 362                                 new->Config[i] = (Uint) strdup( (void*)cur->Config[i] );
 363                         else
 364                                 new->Config[i] = 0;
 365                         break;
 366                 }
 367         }
 368
 369         // Maintain a global list of threads
 370         SHORTLOCK( &glThreadListLock );
 371         new->GlobalPrev = NULL; // Protect against bugs
 372         new->GlobalNext = gAllThreads;
 373         gAllThreads->GlobalPrev = new;
 374         gAllThreads = new;
 375         SHORTREL( &glThreadListLock );
 376
 377         return new;
 378 }
 379
 380 /**
 381  * \brief Get a configuration pointer from the Per-Thread data area
 382  * \param ID    Config slot ID
 383  * \return Pointer at ID
 384  */
 385 Uint *Threads_GetCfgPtr(int ID)
 386 {
 387         if(ID < 0 || ID >= NUM_CFG_ENTRIES) {
 388                 Warning("Threads_GetCfgPtr: Index %i is out of bounds", ID);
 389                 return NULL;
 390         }
 391
 392         return &Proc_GetCurThread()->Config[ID];
 393 }
 394
 395 /**
 396  * \brief Wait for a task to change state
 397  * \param TID   Thread ID to wait on (-1: Any child thread, 0: Any Child/Sibling, <-1: -PID)
 398  * \param Status        Thread return status
 399  * \return TID of child that changed state
 400  */
 401 tTID Threads_WaitTID(int TID, int *Status)
 402 {
 403         // Any Child
 404         if(TID == -1) {
 405                 Log_Error("Threads", "TODO: Threads_WaitTID(TID=-1) - Any Child");
 406                 return -1;
 407         }
 408
 409         // Any peer/child thread
 410         if(TID == 0) {
 411                 Log_Error("Threads", "TODO: Threads_WaitTID(TID=0) - Any Child/Sibling");
 412                 return -1;
 413         }
 414
 415         // TGID = abs(TID)
 416         if(TID < -1) {
 417                 Log_Error("Threads", "TODO: Threads_WaitTID(TID<0) - TGID");
 418                 return -1;
 419         }
 420
 421         // Specific Thread
 422         if(TID > 0) {
 423                 tThread *t = Threads_GetThread(TID);
 424                  int    initStatus = t->Status;
 425                 tTID    ret;
 426
 427                 // Wait for the thread to die!
 428                 if(initStatus != THREAD_STAT_ZOMBIE) {
 429                         // TODO: Handle child also being suspended if wanted
 430                         while(t->Status != THREAD_STAT_ZOMBIE) {
 431                                 Threads_Sleep();
 432                                 Log_Debug("Threads", "%i waiting for %i, t->Status = %i",
 433                                         Threads_GetTID(), t->TID, t->Status);
 434                         }
 435                 }
 436
 437                 // Set return status
 438                 Log_Debug("Threads", "%i waiting for %i, t->Status = %i",
 439                         Threads_GetTID(), t->TID, t->Status);
 440                 ret = t->TID;
 441                 switch(t->Status)
 442                 {
 443                 case THREAD_STAT_ZOMBIE:
 444                         // Kill the thread
 445                         t->Status = THREAD_STAT_DEAD;
 446                         // TODO: Child return value?
 447                         if(Status)      *Status = t->RetStatus;
 448                         // add to delete queue
 449                         Threads_AddToDelete( t );
 450                         break;
 451                 default:
 452                         if(Status)      *Status = -1;
 453                         break;
 454                 }
 455                 return ret;
 456         }
 457
 458         return -1;
 459 }
 460
 461 /**
 462  * \brief Gets a thread given its TID
 463  * \param TID   Thread ID
 464  * \return Thread pointer
 465  */
 466 tThread *Threads_GetThread(Uint TID)
 467 {
 468         tThread *thread;
 469
 470         // Search global list
 471         for(thread = gAllThreads;
 472                 thread;
 473                 thread = thread->GlobalNext)
 474         {
 475                 if(thread->TID == TID)
 476                         return thread;
 477         }
 478
 479         Log("Unable to find TID %i on main list\n", TID);
 480
 481         return NULL;
 482 }
 483
 484 /**
 485  * \brief Adds a thread to the delete queue
 486  * \param Thread        Thread to delete
 487  */
 488 void Threads_AddToDelete(tThread *Thread)
 489 {
 490         // Add to delete queue
 491         // TODO: Is locking needed?
 492         if(gDeleteThreads) {
 493                 Thread->Next = gDeleteThreads;
 494                 gDeleteThreads = Thread;
 495         } else {
 496                 Thread->Next = NULL;
 497                 gDeleteThreads = Thread;
 498         }
 499 }
 500
 501 /**
 502  * \brief Deletes an entry from a list
 503  * \param List  Pointer to the list head
 504  * \param Thread        Thread to find
 505  * \return \a Thread
 506  */
 507 tThread *Threads_int_DelFromQueue(tThread **List, tThread *Thread)
 508 {
 509         tThread *ret, *prev = NULL;
 510
 511         for(ret = *List;
 512                 ret && ret != Thread;
 513                 prev = ret, ret = ret->Next
 514                 );
 515
 516         // Is the thread on the list
 517         if(!ret) {
 518                 //LogF("%p(%s) is not on list %p\n", Thread, Thread->ThreadName, List);
 519                 return NULL;
 520         }
 521
 522         if( !prev ) {
 523                 *List = Thread->Next;
 524                 //LogF("%p(%s) removed from head of %p\n", Thread, Thread->ThreadName, List);
 525         }
 526         else {
 527                 prev->Next = Thread->Next;
 528                 //LogF("%p(%s) removed from %p (prev=%p)\n", Thread, Thread->ThreadName, List, prev);
 529         }
 530
 531         return Thread;
 532 }
 533
 534 /**
 535  * \brief Exit the current process (or another?)
 536  * \param TID   Thread ID to kill
 537  * \param Status        Exit status
 538  */
 539 void Threads_Exit(int TID, int Status)
 540 {
 541         if( TID == 0 )
 542                 Threads_Kill( Proc_GetCurThread(), (Uint)Status & 0xFF );
 543         else
 544                 Threads_Kill( Threads_GetThread(TID), (Uint)Status & 0xFF );
 545
 546         // Halt forever, just in case
 547         for(;;) HALT();
 548 }
 549
 550 /**
 551  * \fn void Threads_Kill(tThread *Thread, int Status)
 552  * \brief Kill a thread
 553  * \param Thread        Thread to kill
 554  * \param Status        Status code to return to the parent
 555  */
 556 void Threads_Kill(tThread *Thread, int Status)
 557 {
 558         tMsg    *msg;
 559          int    isCurThread = Thread == Proc_GetCurThread();
 560
 561         // TODO: Kill all children
 562         #if 1
 563         {
 564                 tThread *child;
 565                 // TODO: I should keep a .Parent pointer, and a .Children list
 566                 for(child = gAllThreads;
 567                         child;
 568                         child = child->GlobalNext)
 569                 {
 570                         if(child->Parent == Thread)
 571                                 Threads_Kill(child, -1);
 572                 }
 573         }
 574         #endif
 575
 576         ///\note Double lock is needed due to overlap of lock areas
 577
 578         // Lock thread (stop us recieving messages)
 579         SHORTLOCK( &Thread->IsLocked );
 580
 581         // Clear Message Queue
 582         while( Thread->Messages )
 583         {
 584                 msg = Thread->Messages->Next;
 585                 free( Thread->Messages );
 586                 Thread->Messages = msg;
 587         }
 588
 589         // Lock thread list
 590         SHORTLOCK( &glThreadListLock );
 591
 592         switch(Thread->Status)
 593         {
 594         case THREAD_STAT_PREINIT:       // Only on main list
 595                 break;
 596
 597         // Currently active thread
 598         case THREAD_STAT_ACTIVE:
 599                 #if SCHEDULER_TYPE == SCHED_RR_PRI
 600                 if( Threads_int_DelFromQueue( &gaActiveThreads[Thread->Priority], Thread ) )
 601                 #else
 602                 if( Threads_int_DelFromQueue( &gActiveThreads, Thread ) )
 603                 #endif
 604                 {
 605                         // Ensure that we are not rescheduled
 606                         Thread->Remaining = 0;  // Clear Remaining Quantum
 607                         Thread->Quantum = 0;    // Clear Quantum to indicate dead thread
 608
 609                         // Update bookkeeping
 610                         giNumActiveThreads --;
 611                         #if SCHEDULER_TYPE == SCHED_LOTTERY
 612                         if( Thread != Proc_GetCurThread() )
 613                                 giFreeTickets -= caiTICKET_COUNTS[ Thread->Priority ];
 614                         #endif
 615                 }
 616                 else
 617                 {
 618                         Log_Warning("Threads",
 619                                 "Threads_Kill - Thread %p(%i,%s) marked as active, but not on list",
 620                                 Thread, Thread->TID, Thread->ThreadName
 621                                 );
 622                 }
 623                 break;
 624         // Kill it while it sleeps!
 625         case THREAD_STAT_SLEEPING:
 626                 if( !Threads_int_DelFromQueue( &gSleepingThreads, Thread ) )
 627                 {
 628                         Log_Warning("Threads",
 629                                 "Threads_Kill - Thread %p(%i,%s) marked as sleeping, but not on list",
 630                                 Thread, Thread->TID, Thread->ThreadName
 631                                 );
 632                 }
 633                 break;
 634
 635         // Brains!... You cannot kill
 636         case THREAD_STAT_ZOMBIE:
 637                 Log_Warning("Threads", "Threads_Kill - Thread %p(%i,%s) is undead, you cannot kill it",
 638                         Thread, Thread->TID, Thread->ThreadName);
 639                 SHORTREL( &glThreadListLock );
 640                 SHORTREL( &Thread->IsLocked );
 641                 return ;
 642
 643         default:
 644                 Log_Warning("Threads", "Threads_Kill - BUG Un-checked status (%i)",
 645                         Thread->Status);
 646                 break;
 647         }
 648
 649         // Save exit status
 650         Thread->RetStatus = Status;
 651
 652         // Don't Zombie if we are being killed because our parent is
 653         if(Status == -1)
 654         {
 655                 Thread->Status = THREAD_STAT_DEAD;
 656                 Threads_AddToDelete( Thread );
 657         } else {
 658                 Thread->Status = THREAD_STAT_ZOMBIE;
 659                 // Wake parent
 660                 Threads_Wake( Thread->Parent );
 661         }
 662
 663         Log("Thread %i went *hurk* (%i)", Thread->TID, Status);
 664
 665         // Release spinlocks
 666         SHORTREL( &glThreadListLock );
 667         SHORTREL( &Thread->IsLocked );  // TODO: We may not actually be released...
 668
 669         // And, reschedule
 670         if(isCurThread) {
 671                 for( ;; )
 672                         HALT();
 673         }
 674 }
 675
 676 /**
 677  * \brief Yield remainder of the current thread's timeslice
 678  */
 679 void Threads_Yield(void)
 680 {
 681         tThread *thread = Proc_GetCurThread();
 682         thread->Remaining = 0;
 683         //while(thread->Remaining == 0)
 684                 HALT();
 685 }
 686
 687 /**
 688  * \fn void Threads_Sleep(void)
 689  * \brief Take the current process off the run queue
 690  */
 691 void Threads_Sleep(void)
 692 {
 693         tThread *cur = Proc_GetCurThread();
 694
 695         // Acquire Spinlock
 696         SHORTLOCK( &glThreadListLock );
 697
 698         // Don't sleep if there is a message waiting
 699         if( cur->Messages ) {
 700                 SHORTREL( &glThreadListLock );
 701                 return;
 702         }
 703
 704         // Remove us from running queue
 705         Threads_RemActive();
 706         // Mark thread as sleeping
 707         cur->Status = THREAD_STAT_SLEEPING;
 708
 709         // Add to Sleeping List (at the top)
 710         cur->Next = gSleepingThreads;
 711         gSleepingThreads = cur;
 712
 713
 714         #if DEBUG_TRACE_STATE
 715         Log("Threads_Sleep: %p (%i %s) sleeping", cur, cur->TID, cur->ThreadName);
 716         #endif
 717
 718         // Release Spinlock
 719         SHORTREL( &glThreadListLock );
 720
 721         while(cur->Status != THREAD_STAT_ACTIVE)        HALT();
 722 }
 723
 724
 725 /**
 726  * \fn int Threads_Wake( tThread *Thread )
 727  * \brief Wakes a sleeping/waiting thread up
 728  * \param Thread        Thread to wake
 729  * \return Boolean Failure (Returns ERRNO)
 730  * \warning This should ONLY be called with task switches disabled
 731  */
 732 int Threads_Wake(tThread *Thread)
 733 {
 734         if(!Thread)
 735                 return -EINVAL;
 736
 737         switch(Thread->Status)
 738         {
 739         case THREAD_STAT_ACTIVE:
 740                 Log("Threads_Wake - Waking awake thread (%i)", Thread->TID);
 741                 return -EALREADY;
 742
 743         case THREAD_STAT_SLEEPING:
 744                 SHORTLOCK( &glThreadListLock );
 745                 // Remove from sleeping queue
 746                 Threads_int_DelFromQueue(&gSleepingThreads, Thread);
 747
 748                 Threads_AddActive( Thread );
 749
 750                 #if DEBUG_TRACE_STATE
 751                 Log("Threads_Sleep: %p (%i %s) woken", Thread, Thread->TID, Thread->ThreadName);
 752                 #endif
 753                 SHORTREL( &glThreadListLock );
 754                 return -EOK;
 755
 756         case THREAD_STAT_WAITING:
 757                 Warning("Threads_Wake - Waiting threads are not currently supported");
 758                 return -ENOTIMPL;
 759
 760         case THREAD_STAT_DEAD:
 761                 Warning("Threads_Wake - Attempt to wake dead thread (%i)", Thread->TID);
 762                 return -ENOTIMPL;
 763
 764         default:
 765                 Warning("Threads_Wake - Unknown process status (%i)\n", Thread->Status);
 766                 return -EINTERNAL;
 767         }
 768 }
 769
 770 /**
 771  * \brief Wake a thread given the TID
 772  * \param TID   Thread ID to wake
 773  * \return Boolean Faulure (errno)
 774  */
 775 int Threads_WakeTID(tTID TID)
 776 {
 777         tThread *thread = Threads_GetThread(TID);
 778          int    ret;
 779         if(!thread)
 780                 return -ENOENT;
 781         ret = Threads_Wake( thread );
 782         //Log_Debug("Threads", "TID %i woke %i (%p)", Threads_GetTID(), TID, thread);
 783         return ret;
 784 }
 785
 786 void Threads_ToggleTrace(int TID)
 787 {
 788         tThread *thread = Threads_GetThread(TID);
 789         if(!thread)     return ;
 790         thread->bInstrTrace = !thread->bInstrTrace;
 791 }
 792
 793 /**
 794  * \brief Adds a thread to the active queue
 795  */
 796 void Threads_AddActive(tThread *Thread)
 797 {
 798         SHORTLOCK( &glThreadListLock );
 799
 800         if( Thread->Status == THREAD_STAT_ACTIVE ) {
 801                 tThread *cur = Proc_GetCurThread();
 802                 Warning("WTF, CPU%i %p (%i %s) is adding %p (%i %s) when it is active",
 803                         GetCPUNum(), cur, cur->TID, cur->ThreadName, Thread, Thread->TID, Thread->ThreadName);
 804                 SHORTREL( &glThreadListLock );
 805                 return ;
 806         }
 807
 808         // Set state
 809         Thread->Status = THREAD_STAT_ACTIVE;
 810         // Add to active list
 811         #if SCHEDULER_TYPE == SCHED_RR_PRI
 812         Thread->Next = gaActiveThreads[Thread->Priority];
 813         gaActiveThreads[Thread->Priority] = Thread;
 814         #else
 815         Thread->Next = gActiveThreads;
 816         gActiveThreads = Thread;
 817         #endif
 818
 819         // Update bookkeeping
 820         giNumActiveThreads ++;
 821
 822         #if SCHEDULER_TYPE == SCHED_LOTTERY
 823         {
 824                  int    delta;
 825                 // Only change the ticket count if the thread is un-scheduled
 826                 if(Thread->CurCPU != -1)
 827                         delta = 0;
 828                 else
 829                         delta = caiTICKET_COUNTS[ Thread->Priority ];
 830
 831                 giFreeTickets += delta;
 832                 # if DEBUG_TRACE_TICKETS
 833                 Log("CPU%i %p (%i %s) added, new giFreeTickets = %i [+%i]",
 834                         GetCPUNum(), Thread, Thread->TID, Thread->ThreadName,
 835                         giFreeTickets, delta
 836                         );
 837                 # endif
 838         }
 839         #endif
 840
 841         SHORTREL( &glThreadListLock );
 842 }
 843
 844 /**
 845  * \brief Removes the current thread from the active queue
 846  * \warning This should ONLY be called with task switches disabled
 847  * \return Current thread pointer
 848  */
 849 tThread *Threads_RemActive(void)
 850 {
 851         tThread *ret = Proc_GetCurThread();
 852
 853         SHORTLOCK( &glThreadListLock );
 854
 855         // Delete from active queue
 856         #if SCHEDULER_TYPE == SCHED_RR_PRI
 857         if( !Threads_int_DelFromQueue(&gaActiveThreads[ret->Priority], ret) )
 858         #else
 859         if( !Threads_int_DelFromQueue(&gActiveThreads, ret) )
 860         #endif
 861         {
 862                 SHORTREL( &glThreadListLock );
 863                 return NULL;
 864         }
 865
 866         ret->Next = NULL;
 867         ret->Remaining = 0;
 868
 869         giNumActiveThreads --;
 870         // no need to decrement tickets, scheduler did it for us
 871
 872         #if SCHEDULER_TYPE == SCHED_LOTTERY && DEBUG_TRACE_TICKETS
 873         Log("CPU%i %p (%i %s) removed, giFreeTickets = %i [nc]",
 874                 GetCPUNum(), ret, ret->TID, ret->ThreadName, giFreeTickets);
 875         #endif
 876
 877         SHORTREL( &glThreadListLock );
 878
 879         return ret;
 880 }
 881
 882 /**
 883  * \fn void Threads_SetFaultHandler(Uint Handler)
 884  * \brief Sets the signal handler for a signal
 885  */
 886 void Threads_SetFaultHandler(Uint Handler)
 887 {
 888         //Log_Debug("Threads", "Threads_SetFaultHandler: Handler = %p", Handler);
 889         Proc_GetCurThread()->FaultHandler = Handler;
 890 }
 891
 892 /**
 893  * \fn void Threads_Fault(int Num)
 894  * \brief Calls a fault handler
 895  */
 896 void Threads_Fault(int Num)
 897 {
 898         tThread *thread = Proc_GetCurThread();
 899
 900         Log_Log("Threads", "Threads_Fault: thread = %p", thread);
 901
 902         if(!thread)     return ;
 903
 904         Log_Log("Threads", "Threads_Fault: thread->FaultHandler = %p", thread->FaultHandler);
 905
 906         switch(thread->FaultHandler)
 907         {
 908         case 0: // Panic?
 909                 Threads_Kill(thread, -1);
 910                 HALT();
 911                 return ;
 912         case 1: // Dump Core?
 913                 Threads_Kill(thread, -1);
 914                 HALT();
 915                 return ;
 916         }
 917
 918         // Double Fault? Oh, F**k
 919         if(thread->CurFaultNum != 0) {
 920                 Threads_Kill(thread, -1);       // For now, just kill
 921                 HALT();
 922         }
 923
 924         thread->CurFaultNum = Num;
 925
 926         Proc_CallFaultHandler(thread);
 927 }
 928
 929 /**
 930  * \fn void Threads_SegFault(tVAddr Addr)
 931  * \brief Called when a Segment Fault occurs
 932  */
 933 void Threads_SegFault(tVAddr Addr)
 934 {
 935         Warning("Thread #%i committed a segfault at address %p", Proc_GetCurThread()->TID, Addr);
 936         Threads_Fault( 1 );
 937         //Threads_Exit( 0, -1 );
 938 }
 939
 940 // --- Process Structure Access Functions ---
 941 tPID Threads_GetPID(void)
 942 {
 943         return Proc_GetCurThread()->TGID;
 944 }
 945 tTID Threads_GetTID(void)
 946 {
 947         return Proc_GetCurThread()->TID;
 948 }
 949 tUID Threads_GetUID(void)
 950 {
 951         return Proc_GetCurThread()->UID;
 952 }
 953 tGID Threads_GetGID(void)
 954 {
 955         return Proc_GetCurThread()->GID;
 956 }
 957
 958 int Threads_SetUID(Uint *Errno, tUID ID)
 959 {
 960         tThread *t = Proc_GetCurThread();
 961         if( t->UID != 0 ) {
 962                 *Errno = -EACCES;
 963                 return -1;
 964         }
 965         Log_Debug("Threads", "TID %i's UID set to %i", t->TID, ID);
 966         t->UID = ID;
 967         return 0;
 968 }
 969
 970 int Threads_SetGID(Uint *Errno, tGID ID)
 971 {
 972         tThread *t = Proc_GetCurThread();
 973         if( t->UID != 0 ) {
 974                 *Errno = -EACCES;
 975                 return -1;
 976         }
 977         Log_Debug("Threads", "TID %i's GID set to %i", t->TID, ID);
 978         t->GID = ID;
 979         return 0;
 980 }
 981
 982 /**
 983  * \fn void Threads_Dump(void)
 984  */
 985 void Threads_DumpActive(void)
 986 {
 987         tThread *thread;
 988         #if SCHEDULER_TYPE == SCHED_RR_PRI
 989          int    i;
 990         #endif
 991
 992         Log("Active Threads: (%i reported)", giNumActiveThreads);
 993
 994         #if SCHEDULER_TYPE == SCHED_RR_PRI
 995         for( i = 0; i < MIN_PRIORITY+1; i++ )
 996         {
 997                 for(thread=gaActiveThreads[i];thread;thread=thread->Next)
 998         #else
 999                 for(thread=gActiveThreads;thread;thread=thread->Next)
1000         #endif
1001                 {
1002                         Log(" %p %i (%i) - %s (CPU %i)",
1003                                 thread, thread->TID, thread->TGID, thread->ThreadName, thread->CurCPU);
1004                         if(thread->Status != THREAD_STAT_ACTIVE)
1005                                 Log("  ERROR State (%i) != THREAD_STAT_ACTIVE (%i)", thread->Status, THREAD_STAT_ACTIVE);
1006                         Log("  Priority %i, Quantum %i", thread->Priority, thread->Quantum);
1007                         Log("  KStack 0x%x", thread->KernelStack);
1008                         if( thread->bInstrTrace )
1009                                 Log("  Tracing Enabled");
1010                         Proc_DumpThreadCPUState(thread);
1011                 }
1012
1013         #if SCHEDULER_TYPE == SCHED_RR_PRI
1014         }
1015         #endif
1016 }
1017
1018 /**
1019  * \fn void Threads_Dump(void)
1020  * \brief Dumps a list of currently running threads
1021  */
1022 void Threads_Dump(void)
1023 {
1024         tThread *thread;
1025
1026         Log("--- Thread Dump ---");
1027         Threads_DumpActive();
1028
1029         Log("All Threads:");
1030         for(thread=gAllThreads;thread;thread=thread->GlobalNext)
1031         {
1032                 Log(" %p %i (%i) - %s (CPU %i)",
1033                         thread, thread->TID, thread->TGID, thread->ThreadName, thread->CurCPU);
1034                 Log("  State %i (%s)", thread->Status, casTHREAD_STAT[thread->Status]);
1035                 switch(thread->Status)
1036                 {
1037                 case THREAD_STAT_MUTEXSLEEP:
1038                         Log("  Mutex Pointer: %p", thread->WaitPointer);
1039                         break;
1040                 case THREAD_STAT_SEMAPHORESLEEP:
1041                         Log("  Semaphore Pointer: %p", thread->WaitPointer);
1042                         Log("  Semaphore Name: %s:%s",
1043                                 ((tSemaphore*)thread->WaitPointer)->ModName,
1044                                 ((tSemaphore*)thread->WaitPointer)->Name
1045                                 );
1046                         break;
1047                 case THREAD_STAT_ZOMBIE:
1048                         Log("  Return Status: %i", thread->RetStatus);
1049                         break;
1050                 default:        break;
1051                 }
1052                 Log("  Priority %i, Quantum %i", thread->Priority, thread->Quantum);
1053                 Log("  KStack 0x%x", thread->KernelStack);
1054                 if( thread->bInstrTrace )
1055                         Log("  Tracing Enabled");
1056                 Proc_DumpThreadCPUState(thread);
1057         }
1058 }
1059
1060 /**
1061  * \brief Gets the next thread to run
1062  * \param CPU   Current CPU
1063  * \param Last  The thread the CPU was running
1064  */
1065 tThread *Threads_GetNextToRun(int CPU, tThread *Last)
1066 {
1067         tThread *thread;
1068
1069         // If this CPU has the lock, we must let it complete
1070         if( CPU_HAS_LOCK( &glThreadListLock ) )
1071                 return Last;
1072
1073         // Don't change threads if the current CPU has switches disabled
1074         if( gaThreads_NoTaskSwitch[CPU] )
1075                 return Last;
1076
1077
1078         // Lock thread list
1079         SHORTLOCK( &glThreadListLock );
1080
1081         // Clear Delete Queue
1082         // - I should probably put this in a worker thread to avoid calling free() in the scheduler
1083         //   DEFINITELY - free() can deadlock in this case
1084         while(gDeleteThreads)
1085         {
1086                 thread = gDeleteThreads->Next;
1087                 // Only free if structure is unused
1088                 if( !IS_LOCKED(&gDeleteThreads->IsLocked) )
1089                 {
1090                         // Set to dead
1091                         gDeleteThreads->Status = THREAD_STAT_BURIED;
1092                         // Free name
1093                         if( IsHeap(gDeleteThreads->ThreadName) )
1094                                 free(gDeleteThreads->ThreadName);
1095                         // Remove from global list
1096                         if( gDeleteThreads == gAllThreads )
1097                                 gAllThreads = gDeleteThreads->GlobalNext;
1098                         else
1099                                 gDeleteThreads->GlobalPrev->GlobalNext = gDeleteThreads->GlobalNext;
1100                         free( gDeleteThreads );
1101                 }
1102                 gDeleteThreads = thread;
1103         }
1104
1105         // No active threads, just take a nap
1106         if(giNumActiveThreads == 0) {
1107                 SHORTREL( &glThreadListLock );
1108                 #if DEBUG_TRACE_TICKETS
1109                 Log("No active threads");
1110                 #endif
1111                 return NULL;
1112         }
1113
1114         #if SCHEDULER_TYPE != SCHED_RR_PRI
1115         // Special case: 1 thread
1116         if(giNumActiveThreads == 1) {
1117                 if( gActiveThreads->CurCPU == -1 )
1118                         gActiveThreads->CurCPU = CPU;
1119
1120                 SHORTREL( &glThreadListLock );
1121
1122                 if( gActiveThreads->CurCPU == CPU )
1123                         return gActiveThreads;
1124
1125                 return NULL;    // CPU has nothing to do
1126         }
1127         #endif
1128
1129         // Allow the old thread to be scheduled again
1130         if( Last ) {
1131                 if( Last->Status == THREAD_STAT_ACTIVE ) {
1132                         #if SCHEDULER_TYPE == SCHED_LOTTERY
1133                         giFreeTickets += caiTICKET_COUNTS[ Last->Priority ];
1134                         # if DEBUG_TRACE_TICKETS
1135                         LogF("Log: CPU%i released %p (%i %s) into the pool (%i [+%i] tickets in pool)\n",
1136                                 CPU, Last, Last->TID, Last->ThreadName, giFreeTickets,
1137                                 caiTICKET_COUNTS[ Last->Priority ]);
1138                         # endif
1139                         #endif
1140                 }
1141                 #if SCHEDULER_TYPE == SCHED_LOTTERY && DEBUG_TRACE_TICKETS
1142                 else
1143                         LogF("Log: CPU%i released %p (%i %s)->Status = %i (Released,not in pool)\n",
1144                                 CPU, Last, Last->TID, Last->ThreadName, Last->Status);
1145                 #endif
1146                 Last->CurCPU = -1;
1147         }
1148
1149         // ---
1150         // Lottery Scheduler
1151         // ---
1152         #if SCHEDULER_TYPE == SCHED_LOTTERY
1153         {
1154                  int    ticket, number;
1155                 # if 1
1156                 number = 0;
1157                 for(thread = gActiveThreads; thread; thread = thread->Next) {
1158                         if(thread->CurCPU >= 0) continue;
1159                         if(thread->Status != THREAD_STAT_ACTIVE)
1160                                 Panic("Bookkeeping fail - %p %i(%s) is on the active queue with a status of %i",
1161                                         thread, thread->TID, thread->ThreadName, thread->Status);
1162                         if(thread->Next == thread) {
1163                                 Panic("Bookkeeping fail - %p %i(%s) loops back on itself",
1164                                         thread, thread->TID, thread->ThreadName, thread->Status);
1165                         }
1166                         number += caiTICKET_COUNTS[ thread->Priority ];
1167                 }
1168                 if(number != giFreeTickets) {
1169                         Panic("Bookkeeping fail (giFreeTickets(%i) != number(%i)) - CPU%i",
1170                                 giFreeTickets, number, CPU);
1171                 }
1172                 # endif
1173
1174                 // No free tickets (all tasks delegated to cores)
1175                 if( giFreeTickets == 0 ) {
1176                         SHORTREL(&glThreadListLock);
1177                         return NULL;
1178                 }
1179
1180                 // Get the ticket number
1181                 ticket = number = rand() % giFreeTickets;
1182
1183                 // Find the next thread
1184                 for(thread=gActiveThreads;thread;thread=thread->Next)
1185                 {
1186                         if(thread->CurCPU >= 0) continue;
1187                         if( caiTICKET_COUNTS[ thread->Priority ] > number)      break;
1188                         number -= caiTICKET_COUNTS[ thread->Priority ];
1189                 }
1190
1191                 // If we didn't find a thread, something went wrong
1192                 if(thread == NULL)
1193                 {
1194                         number = 0;
1195                         for(thread=gActiveThreads;thread;thread=thread->Next) {
1196                                 if(thread->CurCPU >= 0) continue;
1197                                 number += caiTICKET_COUNTS[ thread->Priority ];
1198                         }
1199                         Panic("Bookeeping Failed - giFreeTickets(%i) > true count (%i)",
1200                                 giFreeTickets, number);
1201                 }
1202
1203                 giFreeTickets -= caiTICKET_COUNTS[ thread->Priority ];
1204                 # if DEBUG_TRACE_TICKETS
1205                 LogF("Log: CPU%i allocated %p (%i %s), (%i [-%i] tickets in pool), \n",
1206                         CPU, thread, thread->TID, thread->ThreadName,
1207                         giFreeTickets, caiTICKET_COUNTS[ thread->Priority ]);
1208                 # endif
1209         }
1210
1211         // ---
1212         // Priority based round robin scheduler
1213         // ---
1214         #elif SCHEDULER_TYPE == SCHED_RR_PRI
1215         {
1216                  int    i;
1217                 for( i = 0; i < MIN_PRIORITY + 1; i ++ )
1218                 {
1219                         for(thread = gaActiveThreads[i]; thread; thread = thread->Next)
1220                         {
1221                                 if( thread->CurCPU == -1 )      break;
1222                         }
1223                         // If we fall onto the same queue again, special handling is
1224                         // needed
1225                         if( i == Last->Priority ) {
1226                                 tThread *savedThread = thread;
1227
1228                                 // Find the next unscheduled thread in the list
1229                                 for( thread = Last->Next; thread; thread = thread->Next )
1230                                 {
1231                                         if( thread->CurCPU == -1 )      break;
1232                                 }
1233                                 // If we don't find anything after, just use the one
1234                                 // found above.
1235                                 if( !thread )   thread = savedThread;
1236                         }
1237                         // Found a thread? Schedule it!
1238                         if( thread )    break;
1239                 }
1240
1241                 // Anything to do?
1242                 if( !thread ) {
1243                         SHORTREL(&glThreadListLock);
1244                         return NULL;
1245                 }
1246         }
1247         #elif SCHEDULER_TYPE == SCHED_RR_SIM
1248         {
1249                 // Find the next unscheduled thread in the list
1250                 for( thread = Last->Next; thread; thread = thread->Next )
1251                 {
1252                         if( thread->CurCPU == -1 )      break;
1253                 }
1254                 // If we don't find anything after, search from the beginning
1255                 if( !thread )
1256                 {
1257                         for(thread = gActiveThreads; thread; thread = thread->Next)
1258                         {
1259                                 if( thread->CurCPU == -1 )      break;
1260                         }
1261                 }
1262
1263                 // Anything to do?
1264                 if( !thread ) {
1265                         SHORTREL(&glThreadListLock);
1266                         return NULL;
1267                 }
1268         }
1269         #else
1270         # error "Unimplemented scheduling algorithm"
1271         #endif
1272
1273         // Make the new thread non-schedulable
1274         thread->CurCPU = CPU;
1275
1276         SHORTREL( &glThreadListLock );
1277
1278         return thread;
1279 }
1280
1281 // Acquire mutex (see mutex.h for documentation)
1282 int Mutex_Acquire(tMutex *Mutex)
1283 {
1284         tThread *us = Proc_GetCurThread();
1285
1286         // Get protector
1287         SHORTLOCK( &Mutex->Protector );
1288
1289         //Log("Mutex_Acquire: (%p)", Mutex);
1290
1291         // Check if the lock is already held
1292         if( Mutex->Owner ) {
1293                 SHORTLOCK( &glThreadListLock );
1294                 // - Remove from active list
1295                 us = Threads_RemActive();
1296                 us->Next = NULL;
1297                 // - Mark as sleeping
1298                 us->Status = THREAD_STAT_MUTEXSLEEP;
1299                 us->WaitPointer = Mutex;
1300
1301                 // - Add to waiting
1302                 if(Mutex->LastWaiting) {
1303                         Mutex->LastWaiting->Next = us;
1304                         Mutex->LastWaiting = us;
1305                 }
1306                 else {
1307                         Mutex->Waiting = us;
1308                         Mutex->LastWaiting = us;
1309                 }
1310
1311                 #if DEBUG_TRACE_STATE
1312                 Log("%p (%i %s) waiting on mutex %p",
1313                         us, us->TID, us->ThreadName, Mutex);
1314                 #endif
1315
1316                 #if 0
1317                 {
1318                          int    i = 0;
1319                         tThread *t;
1320                         for( t = Mutex->Waiting; t; t = t->Next, i++ )
1321                                 Log("[%i] (tMutex)%p->Waiting[%i] = %p (%i %s)", us->TID, Mutex, i,
1322                                         t, t->TID, t->ThreadName);
1323                 }
1324                 #endif
1325
1326                 SHORTREL( &glThreadListLock );
1327                 SHORTREL( &Mutex->Protector );
1328                 while(us->Status == THREAD_STAT_MUTEXSLEEP)     Threads_Yield();
1329                 // We're only woken when we get the lock
1330                 us->WaitPointer = NULL;
1331         }
1332         // Ooh, let's take it!
1333         else {
1334                 Mutex->Owner = us;
1335                 SHORTREL( &Mutex->Protector );
1336         }
1337
1338         #if 0
1339         extern tMutex   glPhysAlloc;
1340         if( Mutex != &glPhysAlloc )
1341                 LogF("Mutex %p taken by %i %p\n", Mutex, us->TID, __builtin_return_address(0));
1342         #endif
1343
1344         return 0;
1345 }
1346
1347 // Release a mutex
1348 void Mutex_Release(tMutex *Mutex)
1349 {
1350         SHORTLOCK( &Mutex->Protector );
1351         //Log("Mutex_Release: (%p)", Mutex);
1352         if( Mutex->Waiting ) {
1353                 Mutex->Owner = Mutex->Waiting;  // Set owner
1354                 Mutex->Waiting = Mutex->Waiting->Next;  // Next!
1355                 // Reset ->LastWaiting to NULL if we have just removed the last waiting thread
1356                 // 2010-10-02 21:50 - Comemerating the death of the longest single
1357                 //                    blocker in the Acess2 history. REMEMBER TO
1358                 //                    FUCKING MAINTAIN YOUR FUCKING LISTS DIPWIT
1359                 if( Mutex->LastWaiting == Mutex->Owner )
1360                         Mutex->LastWaiting = NULL;
1361
1362                 // Wake new owner
1363                 SHORTLOCK( &glThreadListLock );
1364                 if( Mutex->Owner->Status != THREAD_STAT_ACTIVE )
1365                         Threads_AddActive(Mutex->Owner);
1366                 SHORTREL( &glThreadListLock );
1367         }
1368         else {
1369                 Mutex->Owner = NULL;
1370         }
1371         SHORTREL( &Mutex->Protector );
1372
1373         #if 0
1374         extern tMutex   glPhysAlloc;
1375         if( Mutex != &glPhysAlloc )
1376                 LogF("Mutex %p released by %i %p\n", Mutex, Threads_GetTID(), __builtin_return_address(0));
1377         #endif
1378 }
1379
1380 // Check if a mutex is locked
1381 int Mutex_IsLocked(tMutex *Mutex)
1382 {
1383         return Mutex->Owner != NULL;
1384 }
1385
1386 //
1387 // Initialise a semaphore
1388 //
1389 void Semaphore_Init(tSemaphore *Sem, int Value, int MaxValue, const char *Module, const char *Name)
1390 {
1391         memset(Sem, 0, sizeof(tSemaphore));
1392         Sem->Value = Value;
1393         Sem->ModName = Module;
1394         Sem->Name = Name;
1395         Sem->MaxValue = MaxValue;
1396 }
1397 //
1398 // Wait for items to be avaliable
1399 //
1400 int Semaphore_Wait(tSemaphore *Sem, int MaxToTake)
1401 {
1402         tThread *us;
1403          int    taken;
1404         if( MaxToTake < 0 ) {
1405                 Log_Warning("Threads", "Semaphore_Wait: User bug - MaxToTake(%i) < 0, Sem=%p(%s)",
1406                         MaxToTake, Sem, Sem->Name);
1407         }
1408
1409         SHORTLOCK( &Sem->Protector );
1410
1411         // Check if there's already items avaliable
1412         if( Sem->Value > 0 ) {
1413                 // Take what we need
1414                 if( MaxToTake && Sem->Value > MaxToTake )
1415                         taken = MaxToTake;
1416                 else
1417                         taken = Sem->Value;
1418                 Sem->Value -= taken;
1419                 SHORTREL( &Sem->Protector );
1420         }
1421         else
1422         {
1423                 SHORTLOCK( &glThreadListLock );
1424
1425                 // - Remove from active list
1426                 us = Threads_RemActive();
1427                 us->Next = NULL;
1428                 // - Mark as sleeping
1429                 us->Status = THREAD_STAT_SEMAPHORESLEEP;
1430                 us->WaitPointer = Sem;
1431                 us->RetStatus = MaxToTake;      // Use RetStatus as a temp variable
1432
1433                 // - Add to waiting
1434                 if(Sem->LastWaiting) {
1435                         Sem->LastWaiting->Next = us;
1436                         Sem->LastWaiting = us;
1437                 }
1438                 else {
1439                         Sem->Waiting = us;
1440                         Sem->LastWaiting = us;
1441                 }
1442
1443                 #if DEBUG_TRACE_STATE
1444                 Log("%p (%i %s) waiting on semaphore %p %s:%s",
1445                         us, us->TID, us->ThreadName,
1446                         Sem, Sem->ModName, Sem->Name);
1447                 #endif
1448
1449                 SHORTREL( &glThreadListLock );
1450                 SHORTREL( &Sem->Protector );
1451                 while(us->Status == THREAD_STAT_SEMAPHORESLEEP) Threads_Yield();
1452                 // We're only woken when there's something avaliable
1453                 us->WaitPointer = NULL;
1454
1455                 taken = us->RetStatus;
1456
1457                 // Get the lock again
1458                 SHORTLOCK( &Sem->Protector );
1459         }
1460
1461         // While there is space, and there are thread waiting
1462         // wake the first thread and give it what it wants (or what's left)
1463         while( (Sem->MaxValue == 0 || Sem->Value < Sem->MaxValue) && Sem->Signaling )
1464         {
1465                  int    given;
1466                 tThread *toWake = Sem->Signaling;
1467
1468                 Sem->Signaling = Sem->Signaling->Next;
1469                 // Reset ->LastWaiting to NULL if we have just removed the last waiting thread
1470                 if( Sem->Signaling == NULL )
1471                         Sem->LastSignaling = NULL;
1472
1473                 // Figure out how much to give
1474                 if( toWake->RetStatus && Sem->Value + toWake->RetStatus < Sem->MaxValue )
1475                         given = toWake->RetStatus;
1476                 else
1477                         given = Sem->MaxValue - Sem->Value;
1478                 Sem->Value -= given;
1479
1480
1481                 #if DEBUG_TRACE_STATE
1482                 Log("%p (%i %s) woken by wait on %p %s:%s",
1483                         toWake, toWake->TID, toWake->ThreadName,
1484                         Sem, Sem->ModName, Sem->Name);
1485                 #endif
1486
1487                 // Save the number we gave to the thread's status
1488                 toWake->RetStatus = given;
1489
1490                 // Wake the sleeper
1491                 SHORTLOCK( &glThreadListLock );
1492                 if( toWake->Status != THREAD_STAT_ACTIVE )
1493                         Threads_AddActive(toWake);
1494                 SHORTREL( &glThreadListLock );
1495         }
1496         SHORTREL( &Sem->Protector );
1497
1498         return taken;
1499 }
1500
1501 //
1502 // Add items to a semaphore
1503 //
1504 int Semaphore_Signal(tSemaphore *Sem, int AmmountToAdd)
1505 {
1506          int    given;
1507          int    added;
1508
1509         if( AmmountToAdd < 0 ) {
1510                 Log_Warning("Threads", "Semaphore_Signal: User bug - AmmountToAdd(%i) < 0, Sem=%p(%s)",
1511                         AmmountToAdd, Sem, Sem->Name);
1512         }
1513         SHORTLOCK( &Sem->Protector );
1514
1515         // Check if we have to block
1516         if( Sem->MaxValue && Sem->Value == Sem->MaxValue )
1517         {
1518                 tThread *us;
1519                 #if 0
1520                 Log_Debug("Threads", "Semaphore_Signal: IDLE Sem = %s:%s", Sem->ModName, Sem->Name);
1521                 Log_Debug("Threads", "Semaphore_Signal: Sem->Value(%i) == Sem->MaxValue(%i)", Sem->Value, Sem->MaxValue);
1522                 #endif
1523
1524                 SHORTLOCK( &glThreadListLock );
1525                 // - Remove from active list
1526                 us = Threads_RemActive();
1527                 us->Next = NULL;
1528                 // - Mark as sleeping
1529                 us->Status = THREAD_STAT_SEMAPHORESLEEP;
1530                 us->WaitPointer = Sem;
1531                 us->RetStatus = AmmountToAdd;   // Use RetStatus as a temp variable
1532
1533                 // - Add to waiting
1534                 if(Sem->LastSignaling) {
1535                         Sem->LastSignaling->Next = us;
1536                         Sem->LastSignaling = us;
1537                 }
1538                 else {
1539                         Sem->Signaling = us;
1540                         Sem->LastSignaling = us;
1541                 }
1542
1543                 #if DEBUG_TRACE_STATE
1544                 Log("%p (%i %s) signaling semaphore %p %s:%s",
1545                         us, us->TID, us->ThreadName,
1546                         Sem, Sem->ModName, Sem->Name);
1547                 #endif
1548
1549                 SHORTREL( &glThreadListLock );
1550                 SHORTREL( &Sem->Protector );
1551                 while(us->Status == THREAD_STAT_SEMAPHORESLEEP) Threads_Yield();
1552                 // We're only woken when there's something avaliable
1553                 us->WaitPointer = NULL;
1554
1555                 added = us->RetStatus;
1556
1557                 // Get the lock again
1558                 SHORTLOCK( &Sem->Protector );
1559         }
1560         // Non blocking
1561         else
1562         {
1563                 // Figure out how much we need to take off
1564                 if( Sem->MaxValue && Sem->Value + AmmountToAdd > Sem->MaxValue)
1565                         added = Sem->MaxValue - Sem->Value;
1566                 else
1567                         added = AmmountToAdd;
1568                 Sem->Value += added;
1569         }
1570
1571         // While there are items avaliable, and there are thread waiting
1572         // wake the first thread and give it what it wants (or what's left)
1573         while( Sem->Value && Sem->Waiting )
1574         {
1575                 tThread *toWake = Sem->Waiting;
1576
1577                 // Remove thread from list (double ended, so clear LastWaiting if needed)
1578                 Sem->Waiting = Sem->Waiting->Next;
1579                 if( Sem->Waiting == NULL )
1580                         Sem->LastWaiting = NULL;
1581
1582                 // Figure out how much to give to woken thread
1583                 // - Requested count is stored in ->RetStatus
1584                 if( toWake->RetStatus && Sem->Value > toWake->RetStatus )
1585                         given = toWake->RetStatus;
1586                 else
1587                         given = Sem->Value;
1588                 Sem->Value -= given;
1589
1590                 // Save the number we gave to the thread's status
1591                 toWake->RetStatus = given;
1592
1593                 if(toWake->bInstrTrace)
1594                         Log("%s(%i) given %i from %p", toWake->ThreadName, toWake->TID, given, Sem);
1595                 #if DEBUG_TRACE_STATE
1596                 Log("%p (%i %s) woken by signal on %p %s:%s",
1597                         toWake, toWake->TID, toWake->ThreadName,
1598                         Sem, Sem->ModName, Sem->Name);
1599                 #endif
1600
1601                 // Wake the sleeper
1602                 SHORTLOCK( &glThreadListLock );
1603                 if( toWake->Status != THREAD_STAT_ACTIVE )
1604                         Threads_AddActive(toWake);
1605                 SHORTREL( &glThreadListLock );
1606         }
1607         SHORTREL( &Sem->Protector );
1608
1609         return added;
1610 }
1611
1612 //
1613 // Get the current value of a semaphore
1614 //
1615 int Semaphore_GetValue(tSemaphore *Sem)
1616 {
1617         return Sem->Value;
1618 }
1619
1620 // === EXPORTS ===
1621 EXPORT(Threads_GetUID);
1622 EXPORT(Threads_GetGID);
1623 EXPORT(Mutex_Acquire);
1624 EXPORT(Mutex_Release);
1625 EXPORT(Mutex_IsLocked);
1626 EXPORT(Semaphore_Init);
1627 EXPORT(Semaphore_Wait);
1628 EXPORT(Semaphore_Signal);