*/
#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 10
-#define DEFAULT_TICKETS 5
-#define MAX_TICKETS 10
-const enum eConfigTypes cCONFIG_TYPES[] = {
- CFGT_HEAPSTR, // e.g. CFG_VFS_CWD
- CFGT_INT, // e.g. CFG_VFS_MAXFILES
- CFGT_NULL
-};
+#define DEFAULT_QUANTUM 5
+#define DEFAULT_PRIORITY 5
+#define MIN_PRIORITY 10
// === IMPORTS ===
-extern void ArchThreads_Init(void);
-extern void Proc_Start(void);
-extern tThread *Proc_GetCurThread(void);
-extern int Proc_Clone(Uint *Err, Uint Flags);
-extern void Proc_CallFaultHandler(tThread *Thread);
+
+// === TYPE ===
+typedef struct
+{
+ tThread *Head;
+ tThread *Tail;
+} tThreadList;
// === PROTOTYPES ===
void Threads_Init(void);
- int Threads_SetName(char *NewName);
-char *Threads_GetName(int ID);
-void Threads_SetTickets(tThread *Thread, int Num);
+#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);
-void Threads_AddToDelete(tThread *Thread);
-tThread *Threads_int_GetPrev(tThread **List, tThread *Thread);
+#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);
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);
- int Threads_SetUID(Uint *Errno, tUID ID);
tGID Threads_GetGID(void);
+ int Threads_SetUID(Uint *Errno, tUID ID);
int Threads_SetGID(Uint *Errno, tUID ID);
+#endif
void Threads_Dump(void);
-void Mutex_Acquire(tMutex *Mutex);
-void Mutex_Release(tMutex *Mutex);
- int Mutex_IsLocked(tMutex *Mutex);
+void Threads_DumpActive(void);
// === GLOBALS ===
// -- Core Thread --
+struct sProcess gProcessZero = {
+ };
// Only used for the core kernel
tThread gThreadZero = {
- Status: THREAD_STAT_ACTIVE, // Status
- ThreadName: "ThreadZero", // Name
- Quantum: DEFAULT_QUANTUM, // Default Quantum
- Remaining: DEFAULT_QUANTUM, // Current Quantum
- NumTickets: DEFAULT_TICKETS // Number of tickets
+ .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;
-volatile int giFreeTickets = 0;
-volatile Uint giNextTID = 1;
+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
-tThread *gActiveThreads = NULL; // Currently Running Threads
-tThread *gSleepingThreads = NULL; // Sleeping Threads
-tThread *gDeleteThreads = NULL; // Threads to delete
- int giNumCPUs = 1;
+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 ===
/**
{
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
- gActiveThreads = &gThreadZero;
- //giFreeTickets = gThreadZero.NumTickets;
+// #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(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;
- cur->ThreadName = NULL;
+ // NOTE: There is a possibility of non-thread safety here
+ // A thread could read the current name pointer before it is zeroed
- if( IsHeap(oldname) ) free( oldname );
+ 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(int ID)
+char *Threads_GetName(tTID ID)
{
if(ID == -1) {
return Proc_GetCurThread()->ThreadName;
}
- // TODO: Find a thread and get its name
- return NULL;
+ return Threads_GetThread(ID)->ThreadName;
}
/**
- * \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 Pri New priority
*/
-void Threads_SetTickets(tThread *Thread, int Num)
+void Threads_SetPriority(tThread *Thread, int Pri)
{
- if(Thread == NULL)
- Thread = Proc_GetCurThread();
- if(Num < 0) return;
- if(Num > MAX_TICKETS) Num = MAX_TICKETS;
-
- if( Thread != Proc_GetCurThread() ) {
+ // 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 );
- giFreeTickets -= Thread->NumTickets - Num;
- Thread->NumTickets = Num;
+
+ #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->NumTickets = Num;
+ Thread->Priority = Pri;
+ #endif
+
+ #if DEBUG_TRACE_STATE
+ Log("Threads_SetPriority: %p(%i %s) pri set %i",
+ Thread, Thread->TID, Thread->ThreadName,
+ Pri);
+ #endif
}
/**
- * \fn tThread *Threads_CloneTCB(Uint *Err, Uint Flags)
+ * \brief Clone the TCB of the current thread
+ * \param Flags Flags for something... (What is this for?)
*/
-tThread *Threads_CloneTCB(Uint *Err, Uint Flags)
+tThread *Threads_CloneTCB(Uint Flags)
{
tThread *cur, *new;
- int i;
cur = Proc_GetCurThread();
+ // Allocate and duplicate
new = malloc(sizeof(tThread));
- if(new == NULL) {
- *Err = -ENOMEM;
- return NULL;
- }
+ 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_ACTIVE;
+ 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)
- new->TGID = new->TID;
- else
- new->TGID = cur->TGID;
+ 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;
// Set State
new->Remaining = new->Quantum = cur->Quantum;
- new->NumTickets = cur->NumTickets;
+ new->Priority = cur->Priority;
+ new->_errno = 0;
// Set Signal Handlers
new->CurFaultNum = 0;
new->FaultHandler = cur->FaultHandler;
- for( i = 0; i < NUM_CFG_ENTRIES; i ++ )
- {
- switch(cCONFIG_TYPES[i])
- {
- default:
- new->Config[i] = cur->Config[i];
- break;
- case CFGT_HEAPSTR:
- if(cur->Config[i])
- new->Config[i] = (Uint) strdup( (void*)cur->Config[i] );
- else
- new->Config[i] = 0;
- break;
- }
- }
-
// Maintain a global list of threads
SHORTLOCK( &glThreadListLock );
new->GlobalPrev = NULL; // Protect against bugs
new->GlobalNext = gAllThreads;
+ gAllThreads->GlobalPrev = new;
gAllThreads = new;
SHORTREL( &glThreadListLock );
}
/**
- * \fn Uint *Threads_GetCfgPtr(int Id)
+ * \brief Clone the TCB of the kernel thread
*/
-Uint *Threads_GetCfgPtr(int Id)
+tThread *Threads_CloneThreadZero(void)
{
- if(Id < 0 || Id >= NUM_CFG_ENTRIES) {
- Warning("Threads_GetCfgPtr: Index %i is out of bounds", Id);
+ 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;
- return &Proc_GetCurThread()->Config[Id];
+ // 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;
}
/**
- * \fn tTID Threads_WaitTID(int TID, int *status)
* \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
*/
-int Threads_WaitTID(int TID, int *status)
+tTID Threads_WaitTID(int TID, int *Status)
{
// Any Child
if(TID == -1) {
// Specific Thread
if(TID > 0) {
tThread *t = Threads_GetThread(TID);
- int initStatus = t->Status;
- int ret;
+ tTID ret;
- if(initStatus != THREAD_STAT_ZOMBIE) {
- // 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);
- }
+ // 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);
}
- Log_Debug("Threads", "%i waiting for %i, t->Status = %i",
- Threads_GetTID(), t->TID, t->Status);
- ret = t->RetStatus;
+ // 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 = 0;
+ if(Status) *Status = t->RetStatus;
// add to delete queue
- Threads_AddToDelete( t );
+ Threads_Delete( t );
break;
default:
- if(status) *status = -1;
+ if(Status) *Status = -1;
break;
}
return ret;
}
/**
- * \fn tThread *Threads_GetThread(Uint TID)
* \brief Gets a thread given its TID
* \param TID Thread ID
+ * \return Thread pointer
*/
tThread *Threads_GetThread(Uint TID)
{
if(thread->TID == TID)
return thread;
}
+
+ Log("Unable to find TID %i on main list\n", TID);
return NULL;
}
/**
- * \fn void Threads_AddToDelete(tThread *Thread)
- * \brief Adds a thread to the delete queue
+ * \brief Deletes an entry from a list
+ * \param List Pointer to the list head
+ * \param Thread Thread to find
+ * \return \a Thread
*/
-void Threads_AddToDelete(tThread *Thread)
+tThread *Threads_int_DelFromQueue(tThreadList *List, tThread *Thread)
{
- // Add to delete queue
- if(gDeleteThreads) {
- Thread->Next = gDeleteThreads;
- gDeleteThreads = Thread;
- } else {
- Thread->Next = NULL;
- gDeleteThreads = 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;
}
-/**
- * \fn tThread *Threads_int_GetPrev(tThread **List, tThread *Thread)
- * \brief Gets the previous entry in a thead linked list
- */
-tThread *Threads_int_GetPrev(tThread **List, tThread *Thread)
-{
- tThread *ret;
- // First Entry
- if(*List == Thread) {
- return (tThread*)List;
- } 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;
- }
- }
- return ret;
+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;
}
/**
- * \fn void Threads_Exit(int TID, int Status)
- * \brief Exit the current process
+ * \brief Exit the current process (or another?)
+ * \param TID Thread ID to kill
+ * \param Status Exit status
*/
void Threads_Exit(int TID, int Status)
{
Threads_Kill( Proc_GetCurThread(), (Uint)Status & 0xFF );
else
Threads_Kill( Threads_GetThread(TID), (Uint)Status & 0xFF );
+
// Halt forever, just in case
- for(;;)
- HALT();
+ for(;;) HALT();
}
/**
*/
void Threads_Kill(tThread *Thread, int Status)
{
- tThread *prev;
tMsg *msg;
+ int isCurThread = Thread == Proc_GetCurThread();
- // Kill all children
- #if 0
+ // TODO: Disown all children?
+ #if 1
{
tThread *child;
- for(child = gActiveThreads;
+ // TODO: I should keep a .Children list
+ for(child = gAllThreads;
child;
- child = child->Next)
+ child = child->GlobalNext)
{
- if(child->PTID == Thread->TID)
- Threads_Kill(child, -1);
+ if(child->Parent == Thread)
+ child->Parent = &gThreadZero;
}
}
#endif
// Lock thread (stop us recieving messages)
SHORTLOCK( &Thread->IsLocked );
- // Lock thread list
- SHORTLOCK( &glThreadListLock );
-
- // Get previous thread on list
- prev = Threads_int_GetPrev( &gActiveThreads, Thread );
- if(!prev) {
- Warning("Proc_Exit - Current thread is not on the active queue");
- SHORTREL( &Thread->IsLocked );
- SHORTREL( &glThreadListLock );
- return;
- }
-
// Clear Message Queue
while( Thread->Messages )
{
Thread->Messages = msg;
}
- Thread->Remaining = 0; // Clear Remaining Quantum
- Thread->Quantum = 0; // Clear Quantum to indicate dead thread
- prev->Next = Thread->Next; // Remove from active
+ // Lock thread list
+ SHORTLOCK( &glThreadListLock );
- giNumActiveThreads --;
- if( Thread != Proc_GetCurThread() )
- giFreeTickets -= Thread->NumTickets;
+ switch(Thread->Status)
+ {
+ case THREAD_STAT_PREINIT: // Only on main list
+ break;
- // Save exit status
- Thread->RetStatus = Status;
+ // 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;
- // Don't Zombie if we are being killed as part of a tree
- if(Status == -1)
- {
- Thread->Status = THREAD_STAT_DEAD;
- Threads_AddToDelete( Thread );
- } else {
- Thread->Status = THREAD_STAT_ZOMBIE;
- // Wake parent
- Threads_Wake( Thread->Parent );
- }
+ // 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 ;
- Log("Thread %i went *hurk* (%i)", Thread->TID, Thread->Status);
+ default:
+ Log_Warning("Threads", "Threads_Kill - BUG Un-checked status (%i)",
+ Thread->Status);
+ break;
+ }
- // Release spinlocks
+ // 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);
- if(Status != -1) HALT();
+ // And, reschedule
+ if(isCurThread)
+ {
+ for( ;; )
+ Proc_Reschedule();
+ }
}
/**
- * \fn void Threads_Yield(void)
- * \brief Yield remainder of timeslice
+ * \brief Yield remainder of the current thread's timeslice
*/
void Threads_Yield(void)
{
- Proc_GetCurThread()->Remaining = 0;
- HALT();
+// Log("Threads_Yield: by %p", __builtin_return_address(0));
+ Proc_Reschedule();
}
/**
{
tThread *cur = Proc_GetCurThread();
- //Log_Log("Threads", "%i going to sleep", cur->TID);
-
// Acquire Spinlock
SHORTLOCK( &glThreadListLock );
// Remove us from running queue
Threads_RemActive();
-
- // Add to Sleeping List (at the top)
- cur->Next = gSleepingThreads;
- gSleepingThreads = cur;
-
// 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) HALT();
+
+ while(cur->Status != THREAD_STAT_ACTIVE) {
+ Proc_Reschedule();
+ if( cur->Status != THREAD_STAT_ACTIVE )
+ Log("%i - Huh? why am I up? zzzz...", cur->TID);
+ }
}
/**
- * \fn int Threads_Wake( tThread *Thread )
* \brief Wakes a sleeping/waiting thread up
* \param Thread Thread to wake
* \return Boolean Failure (Returns ERRNO)
- * \note Should be called with the scheduler lock held
+ * \warning This should ONLY be called with task switches disabled
*/
int Threads_Wake(tThread *Thread)
{
- tThread *prev;
-
if(!Thread)
return -EINVAL;
switch(Thread->Status)
{
case THREAD_STAT_ACTIVE:
- Log("Thread_Wake: Waking awake thread (%i)", Thread->TID);
+ Log("Threads_Wake - Waking awake thread (%i)", Thread->TID);
return -EALREADY;
- case THREAD_STAT_SLEEPING: // TODO: Comment better
+ case THREAD_STAT_SLEEPING:
+ SHORTLOCK( &glThreadListLock );
// Remove from sleeping queue
- prev = Threads_int_GetPrev(&gSleepingThreads, Thread);
- prev->Next = Thread->Next;
- // Add to active queue
- Thread->Next = gActiveThreads;
- gActiveThreads = Thread;
- // Update bookkeeping
- giNumActiveThreads ++;
- giFreeTickets += Thread->NumTickets;
- #if DEBUG_TRACE_TICKETS
- Log("Threads_Wake: new giFreeTickets = %i", giFreeTickets);
- #endif
- Thread->CurCPU = -1;
- Thread->Status = THREAD_STAT_ACTIVE;
+ 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("Thread_Wake - Waiting threads are not currently supported");
+ Warning("Threads_Wake - Waiting threads are not currently supported");
return -ENOTIMPL;
case THREAD_STAT_DEAD:
- Warning("Thread_Wake - Attempt to wake dead thread (%i)", Thread->TID);
+ Warning("Threads_Wake - Attempt to wake dead thread (%i)", Thread->TID);
return -ENOTIMPL;
default:
- Warning("Thread_Wake - Unknown process status (%i)\n", Thread->Status);
+ Warning("Threads_Wake - Unknown process status (%i)\n", Thread->Status);
return -EINTERNAL;
}
}
int ret;
if(!thread)
return -ENOENT;
- SHORTLOCK( &glThreadListLock );
ret = Threads_Wake( thread );
- SHORTREL( &glThreadListLock );
+ //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;
+}
+
/**
- * \fn void Threads_AddActive(tThread *Thread)
* \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
- Thread->Next = gActiveThreads;
- gActiveThreads = Thread;
+ {
+ #if SCHEDULER_TYPE == SCHED_RR_PRI
+ tThreadList *list = &gaActiveThreads[Thread->Priority];
+ #else
+ tThreadList *list = &gActiveThreads;
+ #endif
+ Threads_int_AddToList( list, Thread );
+ }
+
// Update bookkeeping
giNumActiveThreads ++;
- giFreeTickets += Thread->NumTickets;
- #if DEBUG_TRACE_TICKETS
- Log("Threads_AddActive: new giFreeTickets = %i", giFreeTickets);
+
+ #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 task switches disabled
+ * \warning This should ONLY be called with the lock held
* \return Current thread pointer
*/
tThread *Threads_RemActive(void)
{
+ #if 0
tThread *ret = Proc_GetCurThread();
- tThread *prev = Threads_int_GetPrev(&gActiveThreads, ret);
- if(!prev) return NULL;
+
+ 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;
- ret->CurCPU = -1;
- prev->Next = ret->Next;
+
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
}
/**
{
tThread *thread = Proc_GetCurThread();
- Log_Log("Threads", "Threads_Fault: thread = %p", thread);
-
if(!thread) return ;
Log_Log("Threads", "Threads_Fault: thread->FaultHandler = %p", thread->FaultHandler);
// 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();
}
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()->TGID;
+ return Proc_GetCurThread()->Process->PID;
}
tTID Threads_GetTID(void)
{
}
tUID Threads_GetUID(void)
{
- return Proc_GetCurThread()->UID;
+ return Proc_GetCurThread()->Process->UID;
}
tGID Threads_GetGID(void)
{
- return Proc_GetCurThread()->GID;
+ return Proc_GetCurThread()->Process->GID;
}
-int Threads_SetUID(Uint *Errno, tUID ID)
+int Threads_SetUID(tUID ID)
{
tThread *t = Proc_GetCurThread();
- if( t->UID != 0 ) {
- *Errno = -EACCES;
+ if( t->Process->UID != 0 ) {
+ errno = -EACCES;
return -1;
}
- Log_Debug("Threads", "TID %i's UID set to %i", t->TID, ID);
- t->UID = ID;
+ Log_Debug("Threads", "PID %i's UID set to %i", t->Process->PID, ID);
+ t->Process->UID = ID;
return 0;
}
-int Threads_SetGID(Uint *Errno, tGID ID)
+int Threads_SetGID(tGID ID)
{
tThread *t = Proc_GetCurThread();
- if( t->UID != 0 ) {
- *Errno = -EACCES;
+ if( t->Process->UID != 0 ) {
+ errno = -EACCES;
return -1;
}
- Log_Debug("Threads", "TID %i's GID set to %i", t->TID, ID);
- t->GID = ID;
+ 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)
- * \brief Dums a list of currently running threads
*/
-void Threads_Dump(void)
+void Threads_DumpActive(void)
{
tThread *thread;
+ tThreadList *list;
+ #if SCHEDULER_TYPE == SCHED_RR_PRI
+ int i;
+ #endif
- Log("Active Threads:");
- for(thread=gActiveThreads;thread;thread=thread->Next)
+ Log("Active Threads: (%i reported)", giNumActiveThreads);
+
+ #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);
+ 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(" %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(" %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);
}
}
/**
- * \fn tThread *Threads_GetNextToRun(int CPU, tThread *Last)
* \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;
- 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 );
- // Clear Delete Queue
- while(gDeleteThreads)
- {
- thread = gDeleteThreads->Next;
- if( IS_LOCKED(&gDeleteThreads->IsLocked) ) { // Only free if structure is unused
- // Set to dead
- gDeleteThreads->Status = THREAD_STAT_DEAD;
- // Free name
- if( IsHeap(gDeleteThreads->ThreadName) )
- free(gDeleteThreads->ThreadName);
- // Remove from global list
- if( gDeleteThreads == gAllThreads )
- gAllThreads = gDeleteThreads->GlobalNext;
- else
- gDeleteThreads->GlobalPrev->GlobalNext = gDeleteThreads->GlobalNext;
- free( gDeleteThreads );
- }
- gDeleteThreads = thread;
- }
-
+ // 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 );
#endif
return NULL;
}
-
+
+ #if 0
+ #if SCHEDULER_TYPE != SCHED_RR_PRI
// Special case: 1 thread
if(giNumActiveThreads == 1) {
- if( gActiveThreads->CurCPU == -1 )
- gActiveThreads->CurCPU = CPU;
+ if( gActiveThreads.Head->CurCPU == -1 )
+ gActiveThreads.Head->CurCPU = CPU;
+
SHORTREL( &glThreadListLock );
- if( gActiveThreads->CurCPU == CPU )
- return gActiveThreads;
+
+ 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 ) {
- giFreeTickets += Last->NumTickets;
- #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);
+ 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 DEBUG_TRACE_TICKETS
+ #if SCHEDULER_TYPE == SCHED_LOTTERY && DEBUG_TRACE_TICKETS
else
- LogF(" %p (%s)->Status = %i\n", Last, Last->ThreadName, Last->Status);
+ 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;
}
- #if 1
- number = 0;
- for(thread=gActiveThreads;thread;thread=thread->Next) {
- if(thread->CurCPU >= 0) continue;
- 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;
+ // ---
+ // 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
}
- // 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;
+ 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);
+ }
}
- // Error Check
- if(thread == NULL)
+ #elif SCHEDULER_TYPE == SCHED_RR_SIM
{
- number = 0;
- for(thread=gActiveThreads;thread;thread=thread->Next) {
- if(thread->CurCPU >= 0) continue;
- number += thread->NumTickets;
+ // 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;
}
- 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
+ thread->Remaining = thread->Quantum;
SHORTREL( &glThreadListLock );
return thread;
}
-/**
- * \fn void Threads_SegFault(tVAddr Addr)
- * \brief Called when a Segment Fault occurs
- */
-void Threads_SegFault(tVAddr Addr)
-{
- Warning("Thread #%i committed a segfault at address %p", Proc_GetCurThread()->TID, Addr);
- Threads_Fault( 1 );
- //Threads_Exit( 0, -1 );
-}
-
-/**
- * \brief Acquire a heavy mutex
- * \param Mutex Mutex to acquire
- *
- * This type of mutex checks if the mutex is avaliable, and acquires it
- * if it is. Otherwise, the current thread is added to the mutex's wait
- * queue and the thread suspends. When the holder of the mutex completes,
- * the oldest thread (top thread) on the queue is given the lock and
- * restarted.
- */
-void Mutex_Acquire(tMutex *Mutex)
-{
- tThread *us = Proc_GetCurThread();
-
- // Get protector
- SHORTLOCK( &Mutex->Protector );
-
- //Log("Mutex_Acquire: (%p)", Mutex);
-
- // Check if the lock is already held
- if( Mutex->Owner ) {
- SHORTLOCK( &glThreadListLock );
- // - Remove from active list
- Threads_RemActive();
- // - Mark as sleeping
- us->Status = THREAD_STAT_OFFSLEEP;
-
- // - Add to waiting
- if(Mutex->LastWaiting) {
- Mutex->LastWaiting->Next = us;
- Mutex->LastWaiting = us;
- }
- else {
- Mutex->Waiting = us;
- Mutex->LastWaiting = us;
- }
- SHORTREL( &glThreadListLock );
- SHORTREL( &Mutex->Protector );
- while(us->Status == THREAD_STAT_OFFSLEEP) HALT();
- // We're only woken when we get the lock
- }
- // Ooh, let's take it!
- else {
- Mutex->Owner = us;
- SHORTREL( &Mutex->Protector );
- }
-}
-
-/**
- * \brief Release a held mutex
- * \param Mutex Mutex to release
- */
-void Mutex_Release(tMutex *Mutex)
-{
- SHORTLOCK( &Mutex->Protector );
- //Log("Mutex_Release: (%p)", Mutex);
- if( Mutex->Waiting ) {
- Mutex->Owner = Mutex->Waiting; // Set owner
- Mutex->Waiting = Mutex->Waiting->Next; // Next!
- // Wake new owner
- Mutex->Owner->Status = THREAD_STAT_ACTIVE;
- Threads_AddActive(Mutex->Owner);
- Log("Mutex %p Woke %p", Mutex, Mutex->Owner);
- }
- else {
- Mutex->Owner = NULL;
- }
- SHORTREL( &Mutex->Protector );
-}
-
-/**
- * \brief Is this mutex locked?
- * \param Mutex Mutex pointer
- */
-int Mutex_IsLocked(tMutex *Mutex)
-{
- return Mutex->Owner != NULL;
-}
-
// === EXPORTS ===
EXPORT(Threads_GetUID);
+EXPORT(Threads_GetGID);
git.ucc.asn.au / tpg / acess2.git / blobdiff
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