X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=Kernel%2Fthreads.c;h=73c3f3c08b649d10d62c504a17ce2de0f8ea7dcc;hb=9143c184873d0b55444dc1c1084f3e9f3f2614bf;hp=aa550ab74389a1e6bb44b0e7178109e3d0c97485;hpb=126cef9a37b4859e3d6555760a5bbaa308a715d6;p=tpg%2Facess2.git diff --git a/Kernel/threads.c b/Kernel/threads.c index aa550ab7..73c3f3c0 100644 --- a/Kernel/threads.c +++ b/Kernel/threads.c @@ -7,13 +7,22 @@ #include #include +// Configuration #define DEBUG_TRACE_TICKETS 0 // Trace ticket counts #define DEBUG_TRACE_STATE 0 // Trace state changes (sleep/wake) +// --- Schedulers --- +#define SCHED_UNDEF 0 +#define SCHED_LOTTERY 1 // Lottery scheduler +#define SCHED_RR_SIM 2 // Single Queue Round Robin +#define SCHED_RR_PRI 3 // Multi Queue Round Robin +// Set scheduler type +#define SCHEDULER_TYPE SCHED_LOTTERY + // === CONSTANTS === #define DEFAULT_QUANTUM 10 -#define DEFAULT_TICKETS 5 -#define MAX_TICKETS 10 +#define DEFAULT_PRIORITY 5 +#define MIN_PRIORITY 10 const enum eConfigTypes cCONFIG_TYPES[] = { CFGT_HEAPSTR, // e.g. CFG_VFS_CWD CFGT_INT, // e.g. CFG_VFS_MAXFILES @@ -26,17 +35,18 @@ extern void Proc_Start(void); extern tThread *Proc_GetCurThread(void); extern int Proc_Clone(Uint *Err, Uint Flags); extern void Proc_CallFaultHandler(tThread *Thread); +extern int GetCPUNum(void); // === PROTOTYPES === void Threads_Init(void); - int Threads_SetName(char *NewName); + int Threads_SetName(const char *NewName); char *Threads_GetName(int ID); -void Threads_SetTickets(tThread *Thread, int Num); +void Threads_SetPriority(tThread *Thread, int Pri); tThread *Threads_CloneTCB(Uint *Err, Uint Flags); int Threads_WaitTID(int TID, int *status); tThread *Threads_GetThread(Uint TID); void Threads_AddToDelete(tThread *Thread); -tThread *Threads_int_GetPrev(tThread **List, tThread *Thread); +tThread *Threads_int_DelFromQueue(tThread **List, tThread *Thread); void Threads_Exit(int TID, int Status); void Threads_Kill(tThread *Thread, int Status); void Threads_Yield(void); @@ -51,6 +61,7 @@ tUID Threads_GetUID(void); tGID Threads_GetGID(void); int Threads_SetGID(Uint *Errno, tUID ID); void Threads_Dump(void); +void Threads_DumpActive(void); void Mutex_Acquire(tMutex *Mutex); void Mutex_Release(tMutex *Mutex); int Mutex_IsLocked(tMutex *Mutex); @@ -63,21 +74,32 @@ tThread gThreadZero = { ThreadName: "ThreadZero", // Name Quantum: DEFAULT_QUANTUM, // Default Quantum Remaining: DEFAULT_QUANTUM, // Current Quantum - NumTickets: DEFAULT_TICKETS // Number of tickets + Priority: DEFAULT_PRIORITY // Number of tickets }; // -- Processes -- // --- Locks --- tShortSpinlock glThreadListLock; ///\note NEVER use a heap function while locked // --- Current State --- volatile int giNumActiveThreads = 0; // Number of threads on the active queue -volatile int giFreeTickets = 0; // Number of tickets held by non-scheduled threads volatile Uint giNextTID = 1; // Next TID to allocate // --- Thread Lists --- tThread *gAllThreads = NULL; // All allocated threads -tThread *gActiveThreads = NULL; // Currently Running Threads tThread *gSleepingThreads = NULL; // Sleeping Threads tThread *gDeleteThreads = NULL; // Threads to delete int giNumCPUs = 1; // Number of CPUs +BOOL gaThreads_NoTaskSwitch[MAX_CPUS]; // Disables task switches for each core (Pseudo-IF) +// --- Scheduler Types --- +#if SCHEDULER_TYPE == SCHED_LOTTERY +const int caiTICKET_COUNTS[MIN_PRIORITY+1] = {100,81,64,49,36,25,16,9,4,1,0}; +volatile int giFreeTickets = 0; // Number of tickets held by non-scheduled threads +tThread *gActiveThreads = NULL; // Currently Running Threads +#elif SCHEDULER_TYPE == SCHED_RR_SIM +tThread *gActiveThreads = NULL; // Currently Running Threads +#elif SCHEDULER_TYPE == SCHED_RR_PRI +tThread *gaActiveThreads[MIN_PRIORITY+1]; // Active threads for each priority level +#else +# error "Unkown scheduler type" +#endif // === CODE === /** @@ -89,21 +111,25 @@ void Threads_Init(void) ArchThreads_Init(); // Create Initial Task + #if SCHEDULER_TYPE == SCHED_RR_PRI + gaActiveThreads[gThreadZero.Priority] = &gThreadZero; + #else gActiveThreads = &gThreadZero; + #endif + gAllThreads = &gThreadZero; - //giFreeTickets = gThreadZero.NumTickets; // Not needed, as ThreadZero is scheduled giNumActiveThreads = 1; Proc_Start(); } /** - * \fn void Threads_SetName(char *NewName) + * \fn void Threads_SetName(const char *NewName) * \brief Sets the current thread's name * \param NewName New name for the thread * \return Boolean Failure */ -int Threads_SetName(char *NewName) +int Threads_SetName(const char *NewName) { tThread *cur = Proc_GetCurThread(); char *oldname = cur->ThreadName; @@ -135,31 +161,50 @@ char *Threads_GetName(tTID ID) } /** - * \fn void Threads_SetTickets(tThread *Thread, int Num) - * \brief Sets the 'priority' of a task + * \fn void Threads_SetPriority(tThread *Thread, int Pri) + * \brief Sets the priority of a task * \param Thread Thread to update ticket count (NULL means current thread) - * \param Num New ticket count (must be >= 0, clipped to \a MAX_TICKETS) + * \param Pri New priority */ -void Threads_SetTickets(tThread *Thread, int Num) +void Threads_SetPriority(tThread *Thread, int Pri) { // Get current thread if(Thread == NULL) Thread = Proc_GetCurThread(); // Bounds checking - if(Num < 0) return; - if(Num > MAX_TICKETS) Num = MAX_TICKETS; + // - If < 0, set to lowest priority + if(Pri < 0) Pri = MIN_PRIORITY; + if(Pri > MIN_PRIORITY) Pri = MIN_PRIORITY; + // Do we actually have to do anything? + if( Pri == Thread->Priority ) return; + + #if SCHEDULER_TYPE == SCHED_RR_PRI + SHORTLOCK( &glThreadListLock ); + // Remove from old priority + Threads_int_DelFromQueue( &gaActiveThreads[Thread->Priority], Thread ); + // And add to new + Thread->Next = gaActiveThreads[Pri]; + gaActiveThreads[Pri] = Thread; + Thread->Priority = Pri; + SHORTREL( &glThreadListLock ); + #else // If this isn't the current thread, we need to lock - if( Thread != Proc_GetCurThread() ) { + if( Thread != Proc_GetCurThread() ) + { SHORTLOCK( &glThreadListLock ); - giFreeTickets -= Thread->NumTickets - Num; - Thread->NumTickets = Num; - #if DEBUG_TRACE_TICKETS + + #if SCHEDULER_TYPE == SCHED_LOTTERY + giFreeTickets -= caiTICKET_COUNTS[Thread->Priority] - caiTICKET_COUNTS[Pri]; + # if DEBUG_TRACE_TICKETS Log("Threads_SetTickets: new giFreeTickets = %i", giFreeTickets); + # endif #endif + Thread->Priority = Pri; SHORTREL( &glThreadListLock ); } else - Thread->NumTickets = Num; + Thread->Priority = Pri; + #endif } /** @@ -207,7 +252,7 @@ tThread *Threads_CloneTCB(Uint *Err, Uint Flags) // Set State new->Remaining = new->Quantum = cur->Quantum; - new->NumTickets = cur->NumTickets; + new->Priority = cur->Priority; // Set Signal Handlers new->CurFaultNum = 0; @@ -361,33 +406,36 @@ void Threads_AddToDelete(tThread *Thread) } /** - * \brief Gets the previous entry in a thead linked list + * \brief Deletes an entry from a list * \param List Pointer to the list head * \param Thread Thread to find - * \return Thread before \a Thread on \a List - * \note This uses a massive hack of assuming that the first field in the - * structure is the .Next pointer. By doing this, we can return \a List - * as a (tThread*) and simplify other code. + * \return \a Thread */ -tThread *Threads_int_GetPrev(tThread **List, tThread *Thread) +tThread *Threads_int_DelFromQueue(tThread **List, tThread *Thread) { - tThread *ret; - // First Entry - if(*List == Thread) { - return (tThread*)List; + tThread *ret, *prev = NULL; + + for(ret = *List; + ret && ret != Thread; + prev = ret, ret = ret->Next + ); + + // Is the thread on the list + if(!ret) { + //LogF("%p(%s) is not on list %p\n", Thread, Thread->ThreadName, List); + return NULL; + } + + if( !prev ) { + *List = Thread->Next; + //LogF("%p(%s) removed from head of %p\n", Thread, Thread->ThreadName, List); } - // Or not else { - for(ret = *List; - ret->Next && ret->Next != Thread; - ret = ret->Next - ); - // Error if the thread is not on the list - if(!ret->Next || ret->Next != Thread) { - return NULL; - } + prev->Next = Thread->Next; + //LogF("%p(%s) removed from %p (prev=%p)\n", Thread, Thread->ThreadName, List, prev); } - return ret; + + return Thread; } /** @@ -414,7 +462,6 @@ void Threads_Exit(int TID, int Status) */ void Threads_Kill(tThread *Thread, int Status) { - tThread *prev; tMsg *msg; // TODO: Kill all children @@ -437,35 +484,40 @@ void Threads_Kill(tThread *Thread, int Status) // Lock thread (stop us recieving messages) SHORTLOCK( &Thread->IsLocked ); + // Clear Message Queue + while( Thread->Messages ) + { + msg = Thread->Messages->Next; + free( Thread->Messages ); + Thread->Messages = msg; + } + // Lock thread list SHORTLOCK( &glThreadListLock ); - // Get previous thread on list - prev = Threads_int_GetPrev( &gActiveThreads, Thread ); - if(!prev) { + // Delete from active list + #if SCHEDULER_TYPE == SCHED_RR_PRI + if( !Threads_int_DelFromQueue( &gaActiveThreads[Thread->Priority], Thread ) ) + #else + if( !Threads_int_DelFromQueue( &gActiveThreads, Thread ) ) + #endif + { Warning("Proc_Exit - Current thread is not on the active queue"); SHORTREL( &glThreadListLock ); SHORTREL( &Thread->IsLocked ); return; } - // Clear Message Queue - while( Thread->Messages ) - { - msg = Thread->Messages->Next; - free( Thread->Messages ); // BIG NO-NO - Thread->Messages = msg; - } - // Ensure that we are not rescheduled Thread->Remaining = 0; // Clear Remaining Quantum Thread->Quantum = 0; // Clear Quantum to indicate dead thread - prev->Next = Thread->Next; // Remove from active // Update bookkeeping giNumActiveThreads --; + #if SCHEDULER_TYPE == SCHED_LOTTERY if( Thread != Proc_GetCurThread() ) - giFreeTickets -= Thread->NumTickets; + giFreeTickets -= caiTICKET_COUNTS[ Thread->Priority ]; + #endif // Save exit status Thread->RetStatus = Status; @@ -552,8 +604,6 @@ void Threads_Sleep(void) */ int Threads_Wake(tThread *Thread) { - tThread *prev; - if(!Thread) return -EINVAL; @@ -566,8 +616,7 @@ int Threads_Wake(tThread *Thread) case THREAD_STAT_SLEEPING: SHORTLOCK( &glThreadListLock ); // Remove from sleeping queue - prev = Threads_int_GetPrev(&gSleepingThreads, Thread); - prev->Next = Thread->Next; + Threads_int_DelFromQueue(&gSleepingThreads, Thread); Threads_AddActive( Thread ); @@ -614,39 +663,35 @@ void Threads_AddActive(tThread *Thread) { SHORTLOCK( &glThreadListLock ); - #if 1 - { - tThread *t; - for( t = gActiveThreads; t; t = t->Next ) - { - if( t == Thread ) { - Panic("Threads_AddActive: Attempting a double add of TID %i (0x%x)", - Thread->TID, __builtin_return_address(0)); - } - - if(t->Status != THREAD_STAT_ACTIVE) { - Panic("Threads_AddActive: TID %i status != THREAD_STAT_ACTIVE", - Thread->TID); - } - } + if( Thread->Status == THREAD_STAT_ACTIVE ) { + tThread *cur = Proc_GetCurThread(); + Warning("WTF, CPU%i %p (%i %s) is adding %p (%i %s) when it is active", + GetCPUNum(), cur, cur->TID, cur->ThreadName, Thread, Thread->TID, Thread->ThreadName); } - #endif - // Add to active list - Thread->Next = gActiveThreads; - gActiveThreads = Thread; // Set state Thread->Status = THREAD_STAT_ACTIVE; Thread->CurCPU = -1; + // Add to active list + #if SCHEDULER_TYPE == SCHED_RR_PRI + Thread->Next = gaActiveThreads[Thread->Priority]; + gaActiveThreads[Thread->Priority] = Thread; + #else + Thread->Next = gActiveThreads; + gActiveThreads = Thread; + #endif // Update bookkeeping giNumActiveThreads ++; - giFreeTickets += Thread->NumTickets; - #if DEBUG_TRACE_TICKETS - Log("Threads_AddActive: %p %i (%s) added, new giFreeTickets = %i", - Thread, Thread->TID, Thread->ThreadName, giFreeTickets); + #if SCHEDULER_TYPE == SCHED_LOTTERY + giFreeTickets += caiTICKET_COUNTS[ Thread->Priority ]; + # if DEBUG_TRACE_TICKETS + Log("Threads_AddActive: CPU%i %p %i (%s) added, new giFreeTickets = %i", + GetCPUNum(), Thread, Thread->TID, Thread->ThreadName, giFreeTickets); + # endif #endif + SHORTREL( &glThreadListLock ); } @@ -658,26 +703,30 @@ void Threads_AddActive(tThread *Thread) tThread *Threads_RemActive(void) { tThread *ret = Proc_GetCurThread(); - tThread *prev; SHORTLOCK( &glThreadListLock ); - prev = Threads_int_GetPrev(&gActiveThreads, ret); - if(!prev) { + // Delete from active queue + #if SCHEDULER_TYPE == SCHED_RR_PRI + if( !Threads_int_DelFromQueue(&gaActiveThreads[ret->Priority], ret) ) + #else + if( !Threads_int_DelFromQueue(&gActiveThreads, ret) ) + #endif + { SHORTREL( &glThreadListLock ); return NULL; } + ret->Next = NULL; ret->Remaining = 0; ret->CurCPU = -1; - prev->Next = ret->Next; giNumActiveThreads --; // no need to decrement tickets, scheduler did it for us - #if DEBUG_TRACE_TICKETS - Log("Threads_RemActive: %p %i (%s) removed, giFreeTickets = %i", - ret, ret->TID, ret->ThreadName, giFreeTickets); + #if SCHEDULER_TYPE == SCHED_LOTTERY && DEBUG_TRACE_TICKETS + Log("Threads_RemActive: CPU%i %p %i (%s) removed, giFreeTickets = %i", + GetCPUNum(), ret, ret->TID, ret->ThreadName, giFreeTickets); #endif SHORTREL( &glThreadListLock ); @@ -776,49 +825,65 @@ int Threads_SetGID(Uint *Errno, tGID ID) /** * \fn void Threads_Dump(void) - * \brief Dumps a list of currently running threads */ -void Threads_Dump(void) +void Threads_DumpActive(void) { tThread *thread; + #if SCHEDULER_TYPE == SCHED_RR_PRI + int i; + #endif - Log("--- Thread Dump ---"); Log("Active Threads: (%i reported)", giNumActiveThreads); - for(thread=gActiveThreads;thread;thread=thread->Next) - { - Log(" %i (%i) - %s (CPU %i)", - thread->TID, thread->TGID, thread->ThreadName, thread->CurCPU); - if(thread->Status != THREAD_STAT_ACTIVE) - Log(" ERROR State (%i) != THREAD_STAT_ACTIVE (%i)", thread->Status, THREAD_STAT_ACTIVE); - Log(" %i Tickets, Quantum %i", thread->NumTickets, thread->Quantum); - Log(" KStack 0x%x", thread->KernelStack); - } - Log("All Threads:"); - for(thread=gAllThreads;thread;thread=thread->GlobalNext) + #if SCHEDULER_TYPE == SCHED_RR_PRI + for( i = 0; i < MIN_PRIORITY+1; i++ ) { - Log(" %i (%i) - %s (CPU %i)", - thread->TID, thread->TGID, thread->ThreadName, thread->CurCPU); - Log(" State %i", thread->Status); - Log(" %i Tickets, Quantum %i", thread->NumTickets, thread->Quantum); - Log(" KStack 0x%x", thread->KernelStack); + for(thread=gaActiveThreads[i];thread;thread=thread->Next) + #else + for(thread=gActiveThreads;thread;thread=thread->Next) + #endif + { + Log(" %p %i (%i) - %s (CPU %i)", + thread, thread->TID, thread->TGID, thread->ThreadName, thread->CurCPU); + if(thread->Status != THREAD_STAT_ACTIVE) + Log(" ERROR State (%i) != THREAD_STAT_ACTIVE (%i)", thread->Status, THREAD_STAT_ACTIVE); + Log(" Priority %i, Quantum %i", thread->Priority, thread->Quantum); + Log(" KStack 0x%x", thread->KernelStack); + } + + #if SCHEDULER_TYPE == SCHED_RR_PRI } + #endif } + /** * \fn void Threads_Dump(void) + * \brief Dumps a list of currently running threads */ -void Threads_DumpActive(void) +void Threads_Dump(void) { tThread *thread; - Log("Active Threads:"); - for(thread=gActiveThreads;thread;thread=thread->Next) + Log("--- Thread Dump ---"); + Threads_DumpActive(); + + Log("All Threads:"); + for(thread=gAllThreads;thread;thread=thread->GlobalNext) { - Log(" %i (%i) - %s (CPU %i)", - thread->TID, thread->TGID, thread->ThreadName, thread->CurCPU); - if(thread->Status != THREAD_STAT_ACTIVE) - Log(" ERROR State (%i) != THREAD_STAT_ACTIVE (%i)", thread->Status, THREAD_STAT_ACTIVE); - Log(" %i Tickets, Quantum %i", thread->NumTickets, thread->Quantum); + Log(" %p %i (%i) - %s (CPU %i)", + thread, thread->TID, thread->TGID, thread->ThreadName, thread->CurCPU); + Log(" State %i (%s)", thread->Status, casTHREAD_STAT[thread->Status]); + switch(thread->Status) + { + case THREAD_STAT_MUTEXSLEEP: + Log(" Mutex Pointer: %p", thread->WaitPointer); + break; + case THREAD_STAT_ZOMBIE: + Log(" Return Status: %i", thread->RetStatus); + break; + default: break; + } + Log(" Priority %i, Quantum %i", thread->Priority, thread->Quantum); Log(" KStack 0x%x", thread->KernelStack); } } @@ -831,13 +896,16 @@ void Threads_DumpActive(void) tThread *Threads_GetNextToRun(int CPU, tThread *Last) { tThread *thread; - int ticket; - int number; // If this CPU has the lock, we must let it complete if( CPU_HAS_LOCK( &glThreadListLock ) ) return Last; + // Don't change threads if the current CPU has switches disabled + if( gaThreads_NoTaskSwitch[CPU] ) + return Last; + + // Lock thread list SHORTLOCK( &glThreadListLock ); @@ -848,7 +916,7 @@ tThread *Threads_GetNextToRun(int CPU, tThread *Last) thread = gDeleteThreads->Next; if( IS_LOCKED(&gDeleteThreads->IsLocked) ) { // Only free if structure is unused // Set to dead - gDeleteThreads->Status = THREAD_STAT_DEAD; + gDeleteThreads->Status = THREAD_STAT_BURIED; // Free name if( IsHeap(gDeleteThreads->ThreadName) ) free(gDeleteThreads->ThreadName); @@ -871,6 +939,7 @@ tThread *Threads_GetNextToRun(int CPU, tThread *Last) return NULL; } + #if SCHEDULER_TYPE != SCHED_RR_PRI // Special case: 1 thread if(giNumActiveThreads == 1) { if( gActiveThreads->CurCPU == -1 ) @@ -883,88 +952,153 @@ tThread *Threads_GetNextToRun(int CPU, tThread *Last) return NULL; // CPU has nothing to do } + #endif // Allow the old thread to be scheduled again if( Last ) { if( Last->Status == THREAD_STAT_ACTIVE ) { - giFreeTickets += Last->NumTickets; - #if DEBUG_TRACE_TICKETS + #if SCHEDULER_TYPE == SCHED_LOTTERY + giFreeTickets += caiTICKET_COUNTS[ Last->Priority ]; + # if DEBUG_TRACE_TICKETS LogF(" CPU %i released %p (%i %s) into the pool (%i tickets in pool)\n", CPU, Last, Last->TID, Last->ThreadName, giFreeTickets); + # endif #endif } - #if DEBUG_TRACE_TICKETS + #if SCHEDULER_TYPE == SCHED_LOTTERY && DEBUG_TRACE_TICKETS else - LogF(" CPU %i released %p (%s)->Status = %i (Released)\n", - CPU, Last, Last->ThreadName, Last->Status); + LogF(" CPU %i released %p (%i %s)->Status = %i (Released)\n", + CPU, Last, Last->TID, Last->ThreadName, Last->Status); #endif Last->CurCPU = -1; } - #if DEBUG_TRACE_TICKETS - //Threads_DumpActive(); - #endif - - #if 1 - number = 0; - for(thread = gActiveThreads; thread; thread = thread->Next) { - if(thread->CurCPU >= 0) continue; - if(thread->Status != THREAD_STAT_ACTIVE) - Panic("Bookkeeping fail - %p %i(%s) is on the active queue with a status of %i", - thread, thread->TID, thread->ThreadName, thread->Status); - if(thread->Next == thread) { - Panic("Bookkeeping fail - %p %i(%s) loops back on itself", - thread, thread->TID, thread->ThreadName, thread->Status); + // --- + // Lottery Scheduler + // --- + #if SCHEDULER_TYPE == SCHED_LOTTERY + { + int ticket, number; + # if 1 + number = 0; + for(thread = gActiveThreads; thread; thread = thread->Next) { + if(thread->CurCPU >= 0) continue; + if(thread->Status != THREAD_STAT_ACTIVE) + Panic("Bookkeeping fail - %p %i(%s) is on the active queue with a status of %i", + thread, thread->TID, thread->ThreadName, thread->Status); + if(thread->Next == thread) { + Panic("Bookkeeping fail - %p %i(%s) loops back on itself", + thread, thread->TID, thread->ThreadName, thread->Status); + } + number += caiTICKET_COUNTS[ thread->Priority ]; } - number += thread->NumTickets; - } - if(number != giFreeTickets) { - Panic("Bookkeeping fail (giFreeTickets(%i) != number(%i)) - CPU%i", - giFreeTickets, number, CPU); - } - #endif - - // No free tickets (all tasks delegated to cores) - if( giFreeTickets == 0 ) { - SHORTREL(&glThreadListLock); - return NULL; + if(number != giFreeTickets) { + Panic("Bookkeeping fail (giFreeTickets(%i) != number(%i)) - CPU%i", + giFreeTickets, number, CPU); + } + # endif + + // No free tickets (all tasks delegated to cores) + if( giFreeTickets == 0 ) { + SHORTREL(&glThreadListLock); + return NULL; + } + + // Get the ticket number + ticket = number = rand() % giFreeTickets; + + // Find the next thread + for(thread=gActiveThreads;thread;thread=thread->Next) + { + if(thread->CurCPU >= 0) continue; + if( caiTICKET_COUNTS[ thread->Priority ] > number) break; + number -= caiTICKET_COUNTS[ thread->Priority ]; + } + + // If we didn't find a thread, something went wrong + if(thread == NULL) + { + number = 0; + for(thread=gActiveThreads;thread;thread=thread->Next) { + if(thread->CurCPU >= 0) continue; + number += caiTICKET_COUNTS[ thread->Priority ]; + } + Panic("Bookeeping Failed - giFreeTickets(%i) > true count (%i)", + giFreeTickets, number); + } + # if DEBUG_TRACE_TICKETS + LogF(" CPU%i giFreeTickets = %i, running %p (%i %s CPU=%i)\n", + CPU, giFreeTickets, thread, thread->TID, thread->ThreadName, thread->CurCPU); + # endif + + giFreeTickets -= caiTICKET_COUNTS[ thread->Priority ]; } - // Get the ticket number - ticket = number = rand() % giFreeTickets; - - // Find the next thread - for(thread=gActiveThreads;thread;thread=thread->Next) + // --- + // Priority based round robin scheduler + // --- + #elif SCHEDULER_TYPE == SCHED_RR_PRI { - if(thread->CurCPU >= 0) continue; - if(thread->NumTickets > number) break; - number -= thread->NumTickets; + int i; + for( i = 0; i < MIN_PRIORITY + 1; i ++ ) + { + for(thread = gaActiveThreads[i]; thread; thread = thread->Next) + { + if( thread->CurCPU == -1 ) break; + } + // If we fall onto the same queue again, special handling is + // needed + if( i == Last->Priority ) { + tThread *savedThread = thread; + + // Find the next unscheduled thread in the list + for( thread = Last->Next; thread; thread = thread->Next ) + { + if( thread->CurCPU == -1 ) break; + } + // If we don't find anything after, just use the one + // found above. + if( !thread ) thread = savedThread; + } + // Found a thread? Schedule it! + if( thread ) break; + } + + // Anything to do? + if( !thread ) { + SHORTREL(&glThreadListLock); + return NULL; + } } - // Error Check - if(thread == NULL) - { - number = 0; - for(thread=gActiveThreads;thread;thread=thread->Next) { - if(thread->CurCPU >= 0) continue; - number += thread->NumTickets; + #elif SCHEDULER_TYPE == SCHED_RR_SIM + { + // Find the next unscheduled thread in the list + for( thread = Last->Next; thread; thread = thread->Next ) + { + if( thread->CurCPU == -1 ) break; + } + // If we don't find anything after, search from the beginning + if( !thread ) + { + for(thread = gActiveThreads; thread; thread = thread->Next) + { + if( thread->CurCPU == -1 ) break; + } + } + + // Anything to do? + if( !thread ) { + SHORTREL(&glThreadListLock); + return NULL; } - Panic("Bookeeping Failed - giFreeTickets(%i) > true count (%i)", - giFreeTickets, number); } - #if DEBUG_TRACE_TICKETS - LogF(" CPU%i giFreeTickets = %i\n", CPU, giFreeTickets); + #else + # error "Unimplemented scheduling algorithm" #endif // Make the new thread non-schedulable - giFreeTickets -= thread->NumTickets; thread->CurCPU = CPU; - //Threads_Dump(); - #if DEBUG_TRACE_TICKETS - LogF(" CPU%i giFreeTickets = %i, giving %p (%i %s CPU=%i)\n", - CPU, giFreeTickets, thread, thread->TID, thread->ThreadName, thread->CurCPU); - #endif - SHORTREL( &glThreadListLock ); return thread; @@ -1004,9 +1138,11 @@ void Mutex_Acquire(tMutex *Mutex) if( Mutex->Owner ) { SHORTLOCK( &glThreadListLock ); // - Remove from active list - Threads_RemActive(); + us = Threads_RemActive(); + us->Next = NULL; // - Mark as sleeping - us->Status = THREAD_STAT_OFFSLEEP; + us->Status = THREAD_STAT_MUTEXSLEEP; + us->WaitPointer = Mutex; // - Add to waiting if(Mutex->LastWaiting) { @@ -1017,16 +1153,33 @@ void Mutex_Acquire(tMutex *Mutex) Mutex->Waiting = us; Mutex->LastWaiting = us; } + #if 0 + { + int i = 0; + tThread *t; + for( t = Mutex->Waiting; t; t = t->Next, i++ ) + Log("[%i] (tMutex)%p->Waiting[%i] = %p (%i %s)", us->TID, Mutex, i, + t, t->TID, t->ThreadName); + } + #endif + SHORTREL( &glThreadListLock ); SHORTREL( &Mutex->Protector ); - while(us->Status == THREAD_STAT_OFFSLEEP) Threads_Yield(); + while(us->Status == THREAD_STAT_MUTEXSLEEP) Threads_Yield(); // We're only woken when we get the lock + us->WaitPointer = NULL; } // Ooh, let's take it! else { Mutex->Owner = us; SHORTREL( &Mutex->Protector ); } + + #if 0 + extern tMutex glPhysAlloc; + if( Mutex != &glPhysAlloc ) + LogF("Mutex %p taken by %i %p\n", Mutex, us->TID, __builtin_return_address(0)); + #endif } /** @@ -1040,6 +1193,12 @@ void Mutex_Release(tMutex *Mutex) if( Mutex->Waiting ) { Mutex->Owner = Mutex->Waiting; // Set owner Mutex->Waiting = Mutex->Waiting->Next; // Next! + // Reset ->LastWaiting to NULL if we have just removed the last waiting thread + // 2010-10-02 21:50 - Comemerating the death of the longest single + // blocker in the Acess2 history. REMEMBER TO + // FUCKING MAINTAIN YOUR FUCKING LISTS DIPWIT + if( Mutex->LastWaiting == Mutex->Owner ) + Mutex->LastWaiting = NULL; // Wake new owner SHORTLOCK( &glThreadListLock ); @@ -1051,6 +1210,12 @@ void Mutex_Release(tMutex *Mutex) Mutex->Owner = NULL; } SHORTREL( &Mutex->Protector ); + + #if 0 + extern tMutex glPhysAlloc; + if( Mutex != &glPhysAlloc ) + LogF("Mutex %p released by %i %p\n", Mutex, Threads_GetTID(), __builtin_return_address(0)); + #endif } /** @@ -1064,6 +1229,7 @@ int Mutex_IsLocked(tMutex *Mutex) // === EXPORTS === EXPORT(Threads_GetUID); +EXPORT(Threads_GetGID); EXPORT(Mutex_Acquire); EXPORT(Mutex_Release); EXPORT(Mutex_IsLocked);