+++ /dev/null
-/*
- * Acess2
- * threads.c
- * - Common Thread Control
- */
-#include <acess.h>
-#include <threads.h>
-#include <threads_int.h>
-#include <errno.h>
-#include <hal_proc.h>
-#include <semaphore.h>
-#include <vfs_threads.h> // VFS Handle maintainence
-
-// 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_RR_PRI
-
-// === CONSTANTS ===
-#define DEFAULT_QUANTUM 5
-#define DEFAULT_PRIORITY 5
-#define MIN_PRIORITY 10
-
-// === IMPORTS ===
-
-// === TYPE ===
-typedef struct
-{
- tThread *Head;
- tThread *Tail;
-} tThreadList;
-
-// === PROTOTYPES ===
-void Threads_Init(void);
-#if 0
-void Threads_Delete(tThread *Thread);
- int Threads_SetName(const char *NewName);
-#endif
-char *Threads_GetName(tTID ID);
-#if 0
-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);
-#endif
-tThread *Threads_int_DelFromQueue(tThreadList *List, tThread *Thread);
-void Threads_int_AddToList(tThreadList *List, tThread *Thread);
-#if 0
-void Threads_Exit(int TID, int Status);
-void Threads_Kill(tThread *Thread, int Status);
-void Threads_Yield(void);
-void Threads_Sleep(void);
- int Threads_Wake(tThread *Thread);
-void Threads_AddActive(tThread *Thread);
-tThread *Threads_RemActive(void);
-#endif
-void Threads_ToggleTrace(int TID);
-void Threads_Fault(int Num);
-void Threads_SegFault(tVAddr Addr);
-#if 0
- int Threads_GetPID(void);
- int Threads_GetTID(void);
-tUID Threads_GetUID(void);
-tGID Threads_GetGID(void);
- int Threads_SetUID(Uint *Errno, tUID ID);
- int Threads_SetGID(Uint *Errno, tUID ID);
-#endif
-void Threads_Dump(void);
-void Threads_DumpActive(void);
-
-// === GLOBALS ===
-// -- Core Thread --
-struct sProcess gProcessZero = {
- };
-// Only used for the core kernel
-tThread gThreadZero = {
- .Status = THREAD_STAT_ACTIVE, // Status
- .ThreadName = (char*)"ThreadZero", // Name
- .Quantum = DEFAULT_QUANTUM, // Default Quantum
- .Remaining = DEFAULT_QUANTUM, // Current Quantum
- .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 Uint giNextTID = 1; // Next TID to allocate
-// --- Thread Lists ---
-tThread *gAllThreads = NULL; // All allocated threads
-tThreadList gSleepingThreads; // Sleeping Threads
- 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
-tThreadList gActiveThreads; // Currently Running Threads
-#elif SCHEDULER_TYPE == SCHED_RR_SIM
-tThreadList gActiveThreads; // Currently Running Threads
-#elif SCHEDULER_TYPE == SCHED_RR_PRI
-tThreadList gaActiveThreads[MIN_PRIORITY+1]; // Active threads for each priority level
-#else
-# error "Unkown scheduler type"
-#endif
-
-// === CODE ===
-/**
- * \fn void Threads_Init(void)
- * \brief Initialse the thread list
- */
-void Threads_Init(void)
-{
- ArchThreads_Init();
-
- Log_Debug("Threads", "Offsets of tThread");
- Log_Debug("Threads", ".Priority = %i", offsetof(tThread, Priority));
- Log_Debug("Threads", ".KernelStack = %i", offsetof(tThread, KernelStack));
-
- // Create Initial Task
-// #if SCHEDULER_TYPE == SCHED_RR_PRI
-// gaActiveThreads[gThreadZero.Priority].Head = &gThreadZero;
-// gaActiveThreads[gThreadZero.Priority].Tail = &gThreadZero;
-// #else
-// gActiveThreads.Head = &gThreadZero;
-// gActiveThreads.Tail = &gThreadZero;
-// #endif
-
- gAllThreads = &gThreadZero;
- giNumActiveThreads = 1;
- gThreadZero.Process = &gProcessZero;
-
- Proc_Start();
-}
-
-void Threads_Delete(tThread *Thread)
-{
- // Set to dead
- Thread->Status = THREAD_STAT_BURIED;
-
- // Clear out process state
- Proc_ClearThread(Thread);
-
- Thread->Process->nThreads --;
- if( Thread->Process->nThreads == 0 )
- {
- tProcess *proc = Thread->Process;
- // VFS Cleanup
- VFS_CloseAllUserHandles();
- // Architecture cleanup
- Proc_ClearProcess( proc );
- // VFS Configuration strings
- if( proc->CurrentWorkingDir)
- free( proc->CurrentWorkingDir );
- if( proc->RootDir )
- free( proc->RootDir );
- // Process descriptor
- free( proc );
- }
-
- // Free name
- if( IsHeap(Thread->ThreadName) )
- free(Thread->ThreadName);
-
- // Remove from global list
- // TODO: Lock this too
- if( Thread == gAllThreads )
- gAllThreads = Thread->GlobalNext;
- else
- Thread->GlobalPrev->GlobalNext = Thread->GlobalNext;
-
- free(Thread);
-}
-
-/**
- * \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(const char *NewName)
-{
- tThread *cur = Proc_GetCurThread();
- char *oldname = cur->ThreadName;
-
- // NOTE: There is a possibility of non-thread safety here
- // A thread could read the current name pointer before it is zeroed
-
- cur->ThreadName = NULL;
-
- if( IsHeap(oldname) ) free( oldname );
- cur->ThreadName = strdup(NewName);
-
- Log_Debug("Threads", "Thread renamed to '%s'", NewName);
-
- return 0;
-}
-
-/**
- * \fn char *Threads_GetName(int ID)
- * \brief Gets a thread's name
- * \param ID Thread ID (-1 indicates current thread)
- * \return Pointer to name
- * \retval NULL Failure
- */
-char *Threads_GetName(tTID ID)
-{
- if(ID == -1) {
- return Proc_GetCurThread()->ThreadName;
- }
- return Threads_GetThread(ID)->ThreadName;
-}
-
-/**
- * \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 Pri New priority
- */
-void Threads_SetPriority(tThread *Thread, int Pri)
-{
- // Get current thread
- if(Thread == NULL) Thread = Proc_GetCurThread();
- // Bounds checking
- // - If < 0, set to lowest priority
- // - Minumum priority is actualy a high number, 0 is highest
- 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
- if( Thread != Proc_GetCurThread() )
- {
- SHORTLOCK( &glThreadListLock );
- // Remove from old priority
- Threads_int_DelFromQueue( &gaActiveThreads[Thread->Priority], Thread );
- // And add to new
- Threads_int_AddToList( &gaActiveThreads[Pri], Thread );
- Thread->Priority = Pri;
- SHORTREL( &glThreadListLock );
- }
- else
- Thread->Priority = Pri;
- #else
- // If this isn't the current thread, we need to lock
- if( Thread != Proc_GetCurThread() )
- {
- SHORTLOCK( &glThreadListLock );
-
- #if SCHEDULER_TYPE == SCHED_LOTTERY
- giFreeTickets -= caiTICKET_COUNTS[Thread->Priority] - caiTICKET_COUNTS[Pri];
- # if DEBUG_TRACE_TICKETS
- Log("Threads_SetTickets: new giFreeTickets = %i [-%i+%i]",
- giFreeTickets,
- caiTICKET_COUNTS[Thread->Priority], caiTICKET_COUNTS[Pri]);
- # endif
- #endif
- Thread->Priority = Pri;
- SHORTREL( &glThreadListLock );
- }
- else
- Thread->Priority = Pri;
- #endif
-
- #if DEBUG_TRACE_STATE
- Log("Threads_SetPriority: %p(%i %s) pri set %i",
- Thread, Thread->TID, Thread->ThreadName,
- Pri);
- #endif
-}
-
-/**
- * \brief Clone the TCB of the current thread
- * \param Flags Flags for something... (What is this for?)
- */
-tThread *Threads_CloneTCB(Uint Flags)
-{
- tThread *cur, *new;
- cur = Proc_GetCurThread();
-
- // Allocate and duplicate
- new = malloc(sizeof(tThread));
- if(new == NULL) { errno = -ENOMEM; return NULL; }
- memcpy(new, cur, sizeof(tThread));
-
- new->CurCPU = -1;
- new->Next = NULL;
- memset( &new->IsLocked, 0, sizeof(new->IsLocked));
- new->Status = THREAD_STAT_PREINIT;
- new->RetStatus = 0;
-
- // Get Thread ID
- new->TID = giNextTID++;
- new->Parent = cur;
- new->bInstrTrace = 0;
-
- // Clone Name
- new->ThreadName = strdup(cur->ThreadName);
-
- // Set Thread Group ID (PID)
- if(Flags & CLONE_VM) {
- tProcess *newproc, *oldproc;
- oldproc = cur->Process;
- new->Process = malloc( sizeof(struct sProcess) );
- newproc = new->Process;
- newproc->PID = new->TID;
- newproc->UID = oldproc->UID;
- newproc->GID = oldproc->GID;
- newproc->MaxFD = oldproc->MaxFD;
- if( oldproc->CurrentWorkingDir )
- newproc->CurrentWorkingDir = strdup( oldproc->CurrentWorkingDir );
- else
- newproc->CurrentWorkingDir = NULL;
- if( oldproc->RootDir )
- newproc->RootDir = strdup( oldproc->RootDir );
- else
- newproc->RootDir = NULL;
- newproc->nThreads = 1;
- // Reference all handles in the VFS
- VFS_ReferenceUserHandles();
- }
- else {
- new->Process->nThreads ++;
- }
-
- // Messages are not inherited
- new->Messages = NULL;
- new->LastMessage = NULL;
-
- // Set State
- new->Remaining = new->Quantum = cur->Quantum;
- new->Priority = cur->Priority;
- new->_errno = 0;
-
- // Set Signal Handlers
- new->CurFaultNum = 0;
- new->FaultHandler = cur->FaultHandler;
-
- // Maintain a global list of threads
- SHORTLOCK( &glThreadListLock );
- new->GlobalPrev = NULL; // Protect against bugs
- new->GlobalNext = gAllThreads;
- gAllThreads->GlobalPrev = new;
- gAllThreads = new;
- SHORTREL( &glThreadListLock );
-
- return new;
-}
-
-/**
- * \brief Clone the TCB of the kernel thread
- */
-tThread *Threads_CloneThreadZero(void)
-{
- tThread *new;
-
- // Allocate and duplicate
- new = malloc(sizeof(tThread));
- if(new == NULL) {
- return NULL;
- }
- memcpy(new, &gThreadZero, sizeof(tThread));
-
- new->Process->nThreads ++;
-
- new->CurCPU = -1;
- new->Next = NULL;
- memset( &new->IsLocked, 0, sizeof(new->IsLocked));
- new->Status = THREAD_STAT_PREINIT;
- new->RetStatus = 0;
-
- // Get Thread ID
- new->TID = giNextTID++;
- new->Parent = 0;
-
- // Clone Name
- new->ThreadName = NULL;
-
- // Messages are not inherited
- new->Messages = NULL;
- new->LastMessage = NULL;
-
- // Set State
- new->Remaining = new->Quantum = DEFAULT_QUANTUM;
- new->Priority = DEFAULT_PRIORITY;
- new->bInstrTrace = 0;
-
- // Set Signal Handlers
- new->CurFaultNum = 0;
- new->FaultHandler = 0;
-
- // Maintain a global list of threads
- SHORTLOCK( &glThreadListLock );
- new->GlobalPrev = NULL; // Protect against bugs
- new->GlobalNext = gAllThreads;
- gAllThreads->GlobalPrev = new;
- gAllThreads = new;
- SHORTREL( &glThreadListLock );
-
- return new;
-}
-
-/**
- * \brief Wait for a task to change state
- * \param TID Thread ID to wait on (-1: Any child thread, 0: Any Child/Sibling, <-1: -PID)
- * \param Status Thread return status
- * \return TID of child that changed state
- */
-tTID Threads_WaitTID(int TID, int *Status)
-{
- // Any Child
- if(TID == -1) {
- Log_Error("Threads", "TODO: Threads_WaitTID(TID=-1) - Any Child");
- return -1;
- }
-
- // Any peer/child thread
- if(TID == 0) {
- Log_Error("Threads", "TODO: Threads_WaitTID(TID=0) - Any Child/Sibling");
- return -1;
- }
-
- // TGID = abs(TID)
- if(TID < -1) {
- Log_Error("Threads", "TODO: Threads_WaitTID(TID<0) - TGID");
- return -1;
- }
-
- // Specific Thread
- if(TID > 0) {
- tThread *t = Threads_GetThread(TID);
- tTID ret;
-
- // Wait for the thread to die!
- // TODO: Handle child also being suspended if wanted
- while(t->Status != THREAD_STAT_ZOMBIE) {
- Threads_Sleep();
- Log_Debug("Threads", "%i waiting for %i, t->Status = %i",
- Threads_GetTID(), t->TID, t->Status);
- }
-
- // Set return status
- ret = t->TID;
- switch(t->Status)
- {
- case THREAD_STAT_ZOMBIE:
- // Kill the thread
- t->Status = THREAD_STAT_DEAD;
- // TODO: Child return value?
- if(Status) *Status = t->RetStatus;
- // add to delete queue
- Threads_Delete( t );
- break;
- default:
- if(Status) *Status = -1;
- break;
- }
- return ret;
- }
-
- return -1;
-}
-
-/**
- * \brief Gets a thread given its TID
- * \param TID Thread ID
- * \return Thread pointer
- */
-tThread *Threads_GetThread(Uint TID)
-{
- tThread *thread;
-
- // Search global list
- for(thread = gAllThreads;
- thread;
- thread = thread->GlobalNext)
- {
- if(thread->TID == TID)
- return thread;
- }
-
- Log("Unable to find TID %i on main list\n", TID);
-
- return NULL;
-}
-
-/**
- * \brief Deletes an entry from a list
- * \param List Pointer to the list head
- * \param Thread Thread to find
- * \return \a Thread
- */
-tThread *Threads_int_DelFromQueue(tThreadList *List, tThread *Thread)
-{
- tThread *ret, *prev = NULL;
-
- for(ret = List->Head;
- 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->Head = Thread->Next;
- //LogF("%p(%s) removed from head of %p\n", Thread, Thread->ThreadName, List);
- }
- else {
- prev->Next = Thread->Next;
- //LogF("%p(%s) removed from %p (prev=%p)\n", Thread, Thread->ThreadName, List, prev);
- }
- if( Thread->Next == NULL )
- List->Tail = prev;
-
- return Thread;
-}
-
-void Threads_int_AddToList(tThreadList *List, tThread *Thread)
-{
- if( List->Head )
- List->Tail->Next = Thread;
- else
- List->Head = Thread;
- List->Tail = Thread;
- Thread->Next = NULL;
-}
-
-/**
- * \brief Exit the current process (or another?)
- * \param TID Thread ID to kill
- * \param Status Exit status
- */
-void Threads_Exit(int TID, int Status)
-{
- if( TID == 0 )
- Threads_Kill( Proc_GetCurThread(), (Uint)Status & 0xFF );
- else
- Threads_Kill( Threads_GetThread(TID), (Uint)Status & 0xFF );
-
- // Halt forever, just in case
- for(;;) HALT();
-}
-
-/**
- * \fn void Threads_Kill(tThread *Thread, int Status)
- * \brief Kill a thread
- * \param Thread Thread to kill
- * \param Status Status code to return to the parent
- */
-void Threads_Kill(tThread *Thread, int Status)
-{
- tMsg *msg;
- int isCurThread = Thread == Proc_GetCurThread();
-
- // TODO: Disown all children?
- #if 1
- {
- tThread *child;
- // TODO: I should keep a .Children list
- for(child = gAllThreads;
- child;
- child = child->GlobalNext)
- {
- if(child->Parent == Thread)
- child->Parent = &gThreadZero;
- }
- }
- #endif
-
- ///\note Double lock is needed due to overlap of lock areas
-
- // 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 );
-
- switch(Thread->Status)
- {
- case THREAD_STAT_PREINIT: // Only on main list
- break;
-
- // Currently active thread
- case THREAD_STAT_ACTIVE:
- if( Thread != Proc_GetCurThread() )
- {
- #if SCHEDULER_TYPE == SCHED_RR_PRI
- tThreadList *list = &gaActiveThreads[Thread->Priority];
- #else
- tThreadList *list = &gActiveThreads;
- #endif
- if( Threads_int_DelFromQueue( list, Thread ) )
- {
- }
- else
- {
- Log_Warning("Threads",
- "Threads_Kill - Thread %p(%i,%s) marked as active, but not on list",
- Thread, Thread->TID, Thread->ThreadName
- );
- }
- #if SCHEDULER_TYPE == SCHED_LOTTERY
- giFreeTickets -= caiTICKET_COUNTS[ Thread->Priority ];
- #endif
- }
- // Ensure that we are not rescheduled
- Thread->Remaining = 0; // Clear Remaining Quantum
- Thread->Quantum = 0; // Clear Quantum to indicate dead thread
-
- // Update bookkeeping
- giNumActiveThreads --;
- break;
- // Kill it while it sleeps!
- case THREAD_STAT_SLEEPING:
- if( !Threads_int_DelFromQueue( &gSleepingThreads, Thread ) )
- {
- Log_Warning("Threads",
- "Threads_Kill - Thread %p(%i,%s) marked as sleeping, but not on list",
- Thread, Thread->TID, Thread->ThreadName
- );
- }
- break;
-
- // Brains!... You cannot kill something that is already dead
- case THREAD_STAT_ZOMBIE:
- Log_Warning("Threads", "Threads_Kill - Thread %p(%i,%s) is undead, you cannot kill it",
- Thread, Thread->TID, Thread->ThreadName);
- SHORTREL( &glThreadListLock );
- SHORTREL( &Thread->IsLocked );
- return ;
-
- default:
- Log_Warning("Threads", "Threads_Kill - BUG Un-checked status (%i)",
- Thread->Status);
- break;
- }
-
- // Save exit status
- Thread->RetStatus = Status;
-
- SHORTREL( &Thread->IsLocked );
-
- Thread->Status = THREAD_STAT_ZOMBIE;
- SHORTREL( &glThreadListLock );
- // TODO: Send something like SIGCHLD
- Threads_Wake( Thread->Parent );
-
- Log("Thread %i went *hurk* (%i)", Thread->TID, Status);
-
- // And, reschedule
- if(isCurThread)
- {
- for( ;; )
- Proc_Reschedule();
- }
-}
-
-/**
- * \brief Yield remainder of the current thread's timeslice
- */
-void Threads_Yield(void)
-{
-// Log("Threads_Yield: by %p", __builtin_return_address(0));
- Proc_Reschedule();
-}
-
-/**
- * \fn void Threads_Sleep(void)
- * \brief Take the current process off the run queue
- */
-void Threads_Sleep(void)
-{
- tThread *cur = Proc_GetCurThread();
-
- // Acquire Spinlock
- SHORTLOCK( &glThreadListLock );
-
- // Don't sleep if there is a message waiting
- if( cur->Messages ) {
- SHORTREL( &glThreadListLock );
- return;
- }
-
- // Remove us from running queue
- Threads_RemActive();
- // Mark thread as sleeping
- cur->Status = THREAD_STAT_SLEEPING;
-
- // Add to Sleeping List (at the top)
- Threads_int_AddToList( &gSleepingThreads, cur );
-
- #if DEBUG_TRACE_STATE
- Log("Threads_Sleep: %p (%i %s) sleeping", cur, cur->TID, cur->ThreadName);
- #endif
-
- // Release Spinlock
- SHORTREL( &glThreadListLock );
-
- while(cur->Status != THREAD_STAT_ACTIVE) {
- Proc_Reschedule();
- if( cur->Status != THREAD_STAT_ACTIVE )
- Log("%i - Huh? why am I up? zzzz...", cur->TID);
- }
-}
-
-
-/**
- * \brief Wakes a sleeping/waiting thread up
- * \param Thread Thread to wake
- * \return Boolean Failure (Returns ERRNO)
- * \warning This should ONLY be called with task switches disabled
- */
-int Threads_Wake(tThread *Thread)
-{
- if(!Thread)
- return -EINVAL;
-
- switch(Thread->Status)
- {
- case THREAD_STAT_ACTIVE:
- Log("Threads_Wake - Waking awake thread (%i)", Thread->TID);
- return -EALREADY;
-
- case THREAD_STAT_SLEEPING:
- SHORTLOCK( &glThreadListLock );
- // Remove from sleeping queue
- Threads_int_DelFromQueue(&gSleepingThreads, Thread);
-
- SHORTREL( &glThreadListLock );
- Threads_AddActive( Thread );
-
- #if DEBUG_TRACE_STATE
- Log("Threads_Sleep: %p (%i %s) woken", Thread, Thread->TID, Thread->ThreadName);
- #endif
- return -EOK;
-
- case THREAD_STAT_SEMAPHORESLEEP: {
- tSemaphore *sem;
- tThread *th, *prev=NULL;
-
- sem = Thread->WaitPointer;
-
- SHORTLOCK( &sem->Protector );
-
- // Remove from sleeping queue
- for( th = sem->Waiting; th; prev = th, th = th->Next )
- if( th == Thread ) break;
- if( th )
- {
- if(prev)
- prev->Next = Thread->Next;
- else
- sem->Waiting = Thread->Next;
- if(sem->LastWaiting == Thread)
- sem->LastWaiting = prev;
- }
- else
- {
- prev = NULL;
- for( th = sem->Signaling; th; prev = th, th = th->Next )
- if( th == Thread ) break;
- if( !th ) {
- Log_Warning("Threads", "Thread %p(%i %s) is not on semaphore %p(%s:%s)",
- Thread, Thread->TID, Thread->ThreadName,
- sem, sem->ModName, sem->Name);
- return -EINTERNAL;
- }
-
- if(prev)
- prev->Next = Thread->Next;
- else
- sem->Signaling = Thread->Next;
- if(sem->LastSignaling == Thread)
- sem->LastSignaling = prev;
- }
-
- Thread->RetStatus = 0; // It didn't get anything
- Threads_AddActive( Thread );
-
- #if DEBUG_TRACE_STATE
- Log("Threads_Sleep: %p(%i %s) woken from semaphore", Thread, Thread->TID, Thread->ThreadName);
- #endif
- SHORTREL( &sem->Protector );
- } return -EOK;
-
- case THREAD_STAT_WAITING:
- Warning("Threads_Wake - Waiting threads are not currently supported");
- return -ENOTIMPL;
-
- case THREAD_STAT_DEAD:
- Warning("Threads_Wake - Attempt to wake dead thread (%i)", Thread->TID);
- return -ENOTIMPL;
-
- default:
- Warning("Threads_Wake - Unknown process status (%i)\n", Thread->Status);
- return -EINTERNAL;
- }
-}
-
-/**
- * \brief Wake a thread given the TID
- * \param TID Thread ID to wake
- * \return Boolean Faulure (errno)
- */
-int Threads_WakeTID(tTID TID)
-{
- tThread *thread = Threads_GetThread(TID);
- int ret;
- if(!thread)
- return -ENOENT;
- ret = Threads_Wake( thread );
- //Log_Debug("Threads", "TID %i woke %i (%p)", Threads_GetTID(), TID, thread);
- return ret;
-}
-
-void Threads_ToggleTrace(int TID)
-{
- tThread *thread = Threads_GetThread(TID);
- if(!thread) return ;
- thread->bInstrTrace = !thread->bInstrTrace;
-}
-
-/**
- * \brief Adds a thread to the active queue
- */
-void Threads_AddActive(tThread *Thread)
-{
- SHORTLOCK( &glThreadListLock );
-
- if( Thread->Status == THREAD_STAT_ACTIVE ) {
- tThread *cur = Proc_GetCurThread();
- Log_Warning("Threads", "WTF, %p CPU%i %p (%i %s) is adding %p (%i %s) when it is active",
- __builtin_return_address(0),
- GetCPUNum(), cur, cur->TID, cur->ThreadName, Thread, Thread->TID, Thread->ThreadName);
- SHORTREL( &glThreadListLock );
- return ;
- }
-
- // Set state
- Thread->Status = THREAD_STAT_ACTIVE;
-// Thread->CurCPU = -1;
- // Add to active list
- {
- #if SCHEDULER_TYPE == SCHED_RR_PRI
- tThreadList *list = &gaActiveThreads[Thread->Priority];
- #else
- tThreadList *list = &gActiveThreads;
- #endif
- Threads_int_AddToList( list, Thread );
- }
-
- // Update bookkeeping
- giNumActiveThreads ++;
-
- #if SCHEDULER_TYPE == SCHED_LOTTERY
- {
- int delta;
- // Only change the ticket count if the thread is un-scheduled
- if(Thread->CurCPU != -1)
- delta = 0;
- else
- delta = caiTICKET_COUNTS[ Thread->Priority ];
-
- giFreeTickets += delta;
- # if DEBUG_TRACE_TICKETS
- Log("CPU%i %p (%i %s) added, new giFreeTickets = %i [+%i]",
- GetCPUNum(), Thread, Thread->TID, Thread->ThreadName,
- giFreeTickets, delta
- );
- # endif
- }
- #endif
-
- SHORTREL( &glThreadListLock );
-}
-
-/**
- * \brief Removes the current thread from the active queue
- * \warning This should ONLY be called with the lock held
- * \return Current thread pointer
- */
-tThread *Threads_RemActive(void)
-{
- #if 0
- tThread *ret = Proc_GetCurThread();
-
- if( !IS_LOCKED(&glThreadListLock) ) {
- Log_KernelPanic("Threads", "Threads_RemActive called without lock held");
- return NULL;
- }
-
- // 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
- {
- Log_Warning("Threads", "Current thread %p(%i %s) is not on active queue",
- ret, ret->TID, ret->ThreadName
- );
- return NULL;
- }
-
- ret->Next = NULL;
- ret->Remaining = 0;
-
- giNumActiveThreads --;
- // no need to decrement tickets, scheduler did it for us
-
- #if SCHEDULER_TYPE == SCHED_LOTTERY && DEBUG_TRACE_TICKETS
- Log("CPU%i %p (%i %s) removed, giFreeTickets = %i [nc]",
- GetCPUNum(), ret, ret->TID, ret->ThreadName, giFreeTickets);
- #endif
-
- return ret;
- #else
- return Proc_GetCurThread();
- #endif
-}
-
-/**
- * \fn void Threads_SetFaultHandler(Uint Handler)
- * \brief Sets the signal handler for a signal
- */
-void Threads_SetFaultHandler(Uint Handler)
-{
- //Log_Debug("Threads", "Threads_SetFaultHandler: Handler = %p", Handler);
- Proc_GetCurThread()->FaultHandler = Handler;
-}
-
-/**
- * \fn void Threads_Fault(int Num)
- * \brief Calls a fault handler
- */
-void Threads_Fault(int Num)
-{
- tThread *thread = Proc_GetCurThread();
-
- if(!thread) return ;
-
- Log_Log("Threads", "Threads_Fault: thread->FaultHandler = %p", thread->FaultHandler);
-
- switch(thread->FaultHandler)
- {
- case 0: // Panic?
- Threads_Kill(thread, -1);
- HALT();
- return ;
- case 1: // Dump Core?
- Threads_Kill(thread, -1);
- HALT();
- return ;
- }
-
- // Double Fault? Oh, F**k
- if(thread->CurFaultNum != 0) {
- Log_Warning("Threads", "Threads_Fault: Double fault on %i", thread->TID);
- Threads_Kill(thread, -1); // For now, just kill
- HALT();
- }
-
- thread->CurFaultNum = Num;
-
- Proc_CallFaultHandler(thread);
-}
-
-/**
- * \fn void Threads_SegFault(tVAddr Addr)
- * \brief Called when a Segment Fault occurs
- */
-void Threads_SegFault(tVAddr Addr)
-{
- tThread *cur = Proc_GetCurThread();
- cur->bInstrTrace = 0;
- Log_Warning("Threads", "Thread #%i committed a segfault at address %p", cur->TID, Addr);
- MM_DumpTables(0, USER_MAX);
- Threads_Fault( 1 );
- //Threads_Exit( 0, -1 );
-}
-
-// --- Process Structure Access Functions ---
-tPID Threads_GetPID(void)
-{
- return Proc_GetCurThread()->Process->PID;
-}
-tTID Threads_GetTID(void)
-{
- return Proc_GetCurThread()->TID;
-}
-tUID Threads_GetUID(void)
-{
- return Proc_GetCurThread()->Process->UID;
-}
-tGID Threads_GetGID(void)
-{
- return Proc_GetCurThread()->Process->GID;
-}
-
-int Threads_SetUID(tUID ID)
-{
- tThread *t = Proc_GetCurThread();
- if( t->Process->UID != 0 ) {
- errno = -EACCES;
- return -1;
- }
- Log_Debug("Threads", "PID %i's UID set to %i", t->Process->PID, ID);
- t->Process->UID = ID;
- return 0;
-}
-
-int Threads_SetGID(tGID ID)
-{
- tThread *t = Proc_GetCurThread();
- if( t->Process->UID != 0 ) {
- errno = -EACCES;
- return -1;
- }
- Log_Debug("Threads", "PID %i's GID set to %i", t->Process->PID, ID);
- t->Process->GID = ID;
- return 0;
-}
-
-// --- Per-thread storage ---
-int *Threads_GetErrno(void)
-{
- return &Proc_GetCurThread()->_errno;
-}
-
-// --- Configuration ---
-int *Threads_GetMaxFD(void)
-{
- return &Proc_GetCurThread()->Process->MaxFD;
-}
-char **Threads_GetChroot(void)
-{
- return &Proc_GetCurThread()->Process->RootDir;
-}
-char **Threads_GetCWD(void)
-{
- return &Proc_GetCurThread()->Process->CurrentWorkingDir;
-}
-// ---
-
-/**
- * \fn void Threads_Dump(void)
- */
-void Threads_DumpActive(void)
-{
- tThread *thread;
- tThreadList *list;
- #if SCHEDULER_TYPE == SCHED_RR_PRI
- int i;
- #endif
-
- Log("Active Threads: (%i reported)", giNumActiveThreads);
-
- #if SCHEDULER_TYPE == SCHED_RR_PRI
- for( i = 0; i < MIN_PRIORITY+1; i++ )
- {
- list = &gaActiveThreads[i];
- #else
- list = &gActiveThreads;
- #endif
- for(thread=list->Head;thread;thread=thread->Next)
- {
- Log(" %p %i (%i) - %s (CPU %i)",
- thread, thread->TID, thread->Process->PID, 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( thread->bInstrTrace )
- Log(" Tracing Enabled");
- Proc_DumpThreadCPUState(thread);
- }
-
- #if SCHEDULER_TYPE == SCHED_RR_PRI
- }
- #endif
-}
-
-/**
- * \fn void Threads_Dump(void)
- * \brief Dumps a list of currently running threads
- */
-void Threads_Dump(void)
-{
- tThread *thread;
-
- Log("--- Thread Dump ---");
- Threads_DumpActive();
-
- Log("All Threads:");
- for(thread=gAllThreads;thread;thread=thread->GlobalNext)
- {
- Log(" %p %i (%i) - %s (CPU %i)",
- thread, thread->TID, thread->Process->PID, 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_SEMAPHORESLEEP:
- Log(" Semaphore Pointer: %p", thread->WaitPointer);
- Log(" Semaphore Name: %s:%s",
- ((tSemaphore*)thread->WaitPointer)->ModName,
- ((tSemaphore*)thread->WaitPointer)->Name
- );
- 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);
- if( thread->bInstrTrace )
- Log(" Tracing Enabled");
- Proc_DumpThreadCPUState(thread);
- }
-}
-
-/**
- * \brief Gets the next thread to run
- * \param CPU Current CPU
- * \param Last The thread the CPU was running
- */
-tThread *Threads_GetNextToRun(int CPU, tThread *Last)
-{
- tThread *thread;
-
- // 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 );
-
- // Make sure the current (well, old) thread is marked as de-scheduled
- if(Last) Last->CurCPU = -1;
-
- // No active threads, just take a nap
- if(giNumActiveThreads == 0) {
- SHORTREL( &glThreadListLock );
- #if DEBUG_TRACE_TICKETS
- Log("No active threads");
- #endif
- return NULL;
- }
-
- #if 0
- #if SCHEDULER_TYPE != SCHED_RR_PRI
- // Special case: 1 thread
- if(giNumActiveThreads == 1) {
- if( gActiveThreads.Head->CurCPU == -1 )
- gActiveThreads.Head->CurCPU = CPU;
-
- SHORTREL( &glThreadListLock );
-
- if( gActiveThreads.Head->CurCPU == CPU )
- return gActiveThreads.Head;
-
- return NULL; // CPU has nothing to do
- }
- #endif
- #endif
-
- // Allow the old thread to be scheduled again
- if( Last ) {
- if( Last->Status == THREAD_STAT_ACTIVE ) {
- tThreadList *list;
- #if SCHEDULER_TYPE == SCHED_LOTTERY
- giFreeTickets += caiTICKET_COUNTS[ Last->Priority ];
- # if DEBUG_TRACE_TICKETS
- LogF("Log: CPU%i released %p (%i %s) into the pool (%i [+%i] tickets in pool)\n",
- CPU, Last, Last->TID, Last->ThreadName, giFreeTickets,
- caiTICKET_COUNTS[ Last->Priority ]);
- # endif
- #endif
-
- #if SCHEDULER_TYPE == SCHED_RR_PRI
- list = &gaActiveThreads[ Last->Priority ];
- #else
- list = &gActiveThreads;
- #endif
- // Add to end of list
- Threads_int_AddToList( list, Last );
- }
- #if SCHEDULER_TYPE == SCHED_LOTTERY && DEBUG_TRACE_TICKETS
- else
- LogF("Log: CPU%i released %p (%i %s)->Status = %i (Released,not in pool)\n",
- CPU, Last, Last->TID, Last->ThreadName, Last->Status);
- #endif
- Last->CurCPU = -1;
- }
-
- // ---
- // Lottery Scheduler
- // ---
- #if SCHEDULER_TYPE == SCHED_LOTTERY
- {
- int ticket, number;
- # if 1
- number = 0;
- for(thread = gActiveThreads.Head; thread; thread = thread->Next)
- {
- 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 ];
- }
- 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.Head; thread; prev = thread, thread = thread->Next )
- {
- 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);
- }
-
- // Remove
- if(prev)
- prev->Next = thread->Next;
- else
- gActiveThreads.Head = thread->Next;
- if(!thread->Next)
- gActiveThreads.Tail = prev;
-
- giFreeTickets -= caiTICKET_COUNTS[ thread->Priority ];
- # if DEBUG_TRACE_TICKETS
- LogF("Log: CPU%i allocated %p (%i %s), (%i [-%i] tickets in pool), \n",
- CPU, thread, thread->TID, thread->ThreadName,
- giFreeTickets, caiTICKET_COUNTS[ thread->Priority ]);
- # endif
- }
-
- // ---
- // Priority based round robin scheduler
- // ---
- #elif SCHEDULER_TYPE == SCHED_RR_PRI
- {
- int i;
- thread = NULL;
- for( i = 0; i < MIN_PRIORITY + 1; i ++ )
- {
- if( !gaActiveThreads[i].Head )
- continue ;
-
- thread = gaActiveThreads[i].Head;
-
- // Remove from head
- gaActiveThreads[i].Head = thread->Next;
- if(!thread->Next)
- gaActiveThreads[i].Tail = NULL;
- thread->Next = NULL;
- break;
- }
-
- // Anything to do?
- if( !thread ) {
- SHORTREL(&glThreadListLock);
- return NULL;
- }
- if( thread->Status != THREAD_STAT_ACTIVE ) {
- LogF("Oops, Thread %i (%s) is not active\n", thread->TID, thread->ThreadName);
- }
- }
- #elif SCHEDULER_TYPE == SCHED_RR_SIM
- {
- // Get the next thread off the list
- thread = gActiveThreads.Head;
- gActiveThreads.Head = thread->Next;
- if(!thread->Next)
- gaActiveThreads.Tail = NULL;
- thread->Next = NULL;
-
- // Anything to do?
- if( !thread ) {
- SHORTREL(&glThreadListLock);
- return NULL;
- }
- }
- #else
- # error "Unimplemented scheduling algorithm"
- #endif
-
- // Make the new thread non-schedulable
- thread->CurCPU = CPU;
- thread->Remaining = thread->Quantum;
-
- SHORTREL( &glThreadListLock );
-
- return thread;
-}
-
-// === EXPORTS ===
-EXPORT(Threads_GetUID);
-EXPORT(Threads_GetGID);
git.ucc.asn.au / tpg / acess2.git / blobdiff
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