+++ /dev/null
-/*
- * Acess2
- * threads.c
- * - Common Thread Control
- */
-#include <acess.h>
-#include <threads.h>
-#include <threads_int.h>
-#include <errno.h>
-#include <semaphore.h>
-
-// Configuration
-#define DEBUG_TRACE_TICKETS 0 // Trace ticket counts
-#define DEBUG_TRACE_STATE 0 // Trace state changes (sleep/wake)
-#define SEMAPHORE_DEBUG 0
-
-// --- 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_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
- CFGT_NULL
-};
-
-// === IMPORTS ===
-extern void ArchThreads_Init(void);
-extern void Proc_CallFaultHandler(tThread *Thread);
-extern void Proc_DumpThreadCPUState(tThread *Thread);
-extern int GetCPUNum(void);
-
-// === PROTOTYPES ===
-void Threads_Init(void);
-#if 0
- int Threads_SetName(const char *NewName);
-#endif
-char *Threads_GetName(int 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
-void Threads_AddToDelete(tThread *Thread);
-tThread *Threads_int_DelFromQueue(tThread **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);
-#if 0
- int Mutex_Acquire(tMutex *Mutex);
-void Mutex_Release(tMutex *Mutex);
- int Mutex_IsLocked(tMutex *Mutex);
-#endif
-
-// === GLOBALS ===
-// -- Core Thread --
-// 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
-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 ===
-/**
- * \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));
-
- // Create Initial Task
- #if SCHEDULER_TYPE == SCHED_RR_PRI
- gaActiveThreads[gThreadZero.Priority] = &gThreadZero;
- #else
- gActiveThreads = &gThreadZero;
- #endif
-
- gAllThreads = &gThreadZero;
- giNumActiveThreads = 1;
-
- Proc_Start();
-}
-
-/**
- * \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);
- 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
- 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() )
- {
- 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
-}
-
-/**
- * \fn tThread *Threads_CloneTCB(Uint *Err, Uint Flags)
- * \brief Clone the TCB of the current thread
- * \param Err Error pointer
- * \param Flags Flags for something... (What is this for?)
- */
-tThread *Threads_CloneTCB(Uint *Err, Uint Flags)
-{
- tThread *cur, *new;
- int i;
- cur = Proc_GetCurThread();
-
- // Allocate and duplicate
- new = malloc(sizeof(tThread));
- if(new == NULL) { *Err = -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)
- new->TGID = new->TID;
- else
- new->TGID = cur->TGID;
-
- // Messages are not inherited
- new->Messages = NULL;
- new->LastMessage = NULL;
-
- // Set State
- new->Remaining = new->Quantum = cur->Quantum;
- new->Priority = cur->Priority;
-
- // 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 );
-
- return new;
-}
-
-/**
- * \fn tThread *Threads_CloneTCB(Uint *Err, Uint Flags)
- * \brief Clone the TCB of the current thread
- */
-tThread *Threads_CloneThreadZero(void)
-{
- tThread *cur, *new;
- int i;
- cur = Proc_GetCurThread();
-
- // Allocate and duplicate
- new = malloc(sizeof(tThread));
- if(new == NULL) {
- return NULL;
- }
- memcpy(new, &gThreadZero, 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 = 0;
-
- // Clone Name
- new->ThreadName = NULL;
-
- // Messages are not inherited
- new->Messages = NULL;
- new->LastMessage = NULL;
-
- // Set State
- new->Remaining = new->Quantum = cur->Quantum;
- new->Priority = cur->Priority;
- new->bInstrTrace = 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 );
-
- return new;
-}
-
-/**
- * \brief Get a configuration pointer from the Per-Thread data area
- * \param ID Config slot ID
- * \return Pointer at ID
- */
-Uint *Threads_GetCfgPtr(int ID)
-{
- if(ID < 0 || ID >= NUM_CFG_ENTRIES) {
- Warning("Threads_GetCfgPtr: Index %i is out of bounds", ID);
- return NULL;
- }
-
- return &Proc_GetCurThread()->Config[ID];
-}
-
-/**
- * \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);
- int initStatus = t->Status;
- tTID ret;
-
- // Wait for the thread to die!
- 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);
- }
- }
-
- // Set return status
- Log_Debug("Threads", "%i waiting for %i, t->Status = %i",
- Threads_GetTID(), t->TID, t->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_AddToDelete( 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 Adds a thread to the delete queue
- * \param Thread Thread to delete
- */
-void Threads_AddToDelete(tThread *Thread)
-{
- // Add to delete queue
- // TODO: Is locking needed?
- if(gDeleteThreads) {
- Thread->Next = gDeleteThreads;
- gDeleteThreads = Thread;
- } else {
- Thread->Next = NULL;
- gDeleteThreads = Thread;
- }
-}
-
-/**
- * \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(tThread **List, tThread *Thread)
-{
- 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);
- }
- else {
- prev->Next = Thread->Next;
- //LogF("%p(%s) removed from %p (prev=%p)\n", Thread, Thread->ThreadName, List, prev);
- }
-
- return Thread;
-}
-
-/**
- * \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: Kill all children
- #if 1
- {
- tThread *child;
- // TODO: I should keep a .Parent pointer, and a .Children list
- for(child = gAllThreads;
- child;
- child = child->GlobalNext)
- {
- if(child->Parent == Thread)
- Threads_Kill(child, -1);
- }
- }
- #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 SCHEDULER_TYPE == SCHED_RR_PRI
- if( Threads_int_DelFromQueue( &gaActiveThreads[Thread->Priority], Thread ) )
- #else
- if( Threads_int_DelFromQueue( &gActiveThreads, Thread ) )
- #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 --;
- #if SCHEDULER_TYPE == SCHED_LOTTERY
- if( Thread != Proc_GetCurThread() )
- giFreeTickets -= caiTICKET_COUNTS[ Thread->Priority ];
- #endif
- }
- else
- {
- Log_Warning("Threads",
- "Threads_Kill - Thread %p(%i,%s) marked as active, but not on list",
- Thread, Thread->TID, Thread->ThreadName
- );
- }
- 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
- 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;
-
- // Don't Zombie if we are being killed because our parent is
- if(Status == -1)
- {
- Thread->Status = THREAD_STAT_DEAD;
- Threads_AddToDelete( Thread );
- } else {
- Thread->Status = THREAD_STAT_ZOMBIE;
- // Wake parent
- Threads_Wake( Thread->Parent );
- }
-
- Log("Thread %i went *hurk* (%i)", Thread->TID, Status);
-
- // Release spinlocks
- SHORTREL( &glThreadListLock );
- SHORTREL( &Thread->IsLocked ); // TODO: We may not actually be released...
-
- // And, reschedule
- if(isCurThread) {
- for( ;; )
- HALT();
- }
-}
-
-/**
- * \brief Yield remainder of the current thread's timeslice
- */
-void Threads_Yield(void)
-{
- tThread *thread = Proc_GetCurThread();
- thread->Remaining = 0;
- //while(thread->Remaining == 0)
- HALT();
-}
-
-/**
- * \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)
- cur->Next = gSleepingThreads;
- 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();
-}
-
-
-/**
- * \fn int Threads_Wake( tThread *Thread )
- * \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);
-
- Threads_AddActive( Thread );
-
- #if DEBUG_TRACE_STATE
- Log("Threads_Sleep: %p (%i %s) woken", Thread, Thread->TID, Thread->ThreadName);
- #endif
- SHORTREL( &glThreadListLock );
- 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();
- 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);
- SHORTREL( &glThreadListLock );
- return ;
- }
-
- // 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 ++;
-
- #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
- * \return Current thread pointer
- */
-tThread *Threads_RemActive(void)
-{
- tThread *ret = Proc_GetCurThread();
-
- SHORTLOCK( &glThreadListLock );
-
- // 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;
-
- 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
-
- SHORTREL( &glThreadListLock );
-
- return ret;
-}
-
-/**
- * \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();
-
- Log_Log("Threads", "Threads_Fault: thread = %p", thread);
-
- 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) {
- 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)
-{
- Warning("Thread #%i committed a segfault at address %p", Proc_GetCurThread()->TID, Addr);
- Threads_Fault( 1 );
- //Threads_Exit( 0, -1 );
-}
-
-// --- Process Structure Access Functions ---
-tPID Threads_GetPID(void)
-{
- return Proc_GetCurThread()->TGID;
-}
-tTID Threads_GetTID(void)
-{
- return Proc_GetCurThread()->TID;
-}
-tUID Threads_GetUID(void)
-{
- return Proc_GetCurThread()->UID;
-}
-tGID Threads_GetGID(void)
-{
- return Proc_GetCurThread()->GID;
-}
-
-int Threads_SetUID(Uint *Errno, tUID ID)
-{
- tThread *t = Proc_GetCurThread();
- if( t->UID != 0 ) {
- *Errno = -EACCES;
- return -1;
- }
- Log_Debug("Threads", "TID %i's UID set to %i", t->TID, ID);
- t->UID = ID;
- return 0;
-}
-
-int Threads_SetGID(Uint *Errno, tGID ID)
-{
- tThread *t = Proc_GetCurThread();
- if( t->UID != 0 ) {
- *Errno = -EACCES;
- return -1;
- }
- Log_Debug("Threads", "TID %i's GID set to %i", t->TID, ID);
- t->GID = ID;
- return 0;
-}
-
-/**
- * \fn void Threads_Dump(void)
- */
-void Threads_DumpActive(void)
-{
- tThread *thread;
- #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++ )
- {
- 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( 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->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_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 );
-
- // Clear Delete Queue
- // - I should probably put this in a worker thread to avoid calling free() in the scheduler
- // DEFINITELY - free() can deadlock in this case
- // I'll do it when it becomes an issue
- while(gDeleteThreads)
- {
- thread = gDeleteThreads->Next;
- // Only free if structure is unused
- if( !IS_LOCKED(&gDeleteThreads->IsLocked) )
- {
- // Set to dead
- gDeleteThreads->Status = THREAD_STAT_BURIED;
- // 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 );
- #if DEBUG_TRACE_TICKETS
- Log("No active threads");
- #endif
- return NULL;
- }
-
- #if SCHEDULER_TYPE != SCHED_RR_PRI
- // Special case: 1 thread
- if(giNumActiveThreads == 1) {
- if( gActiveThreads->CurCPU == -1 )
- gActiveThreads->CurCPU = CPU;
-
- SHORTREL( &glThreadListLock );
-
- if( gActiveThreads->CurCPU == CPU )
- return gActiveThreads;
-
- return NULL; // CPU has nothing to do
- }
- #endif
-
- // Allow the old thread to be scheduled again
- if( Last ) {
- if( Last->Status == THREAD_STAT_ACTIVE ) {
- #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_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; 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 ];
- }
- 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);
- }
-
- 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;
- 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;
- }
- }
- #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;
- }
- }
- #else
- # error "Unimplemented scheduling algorithm"
- #endif
-
- // Make the new thread non-schedulable
- thread->CurCPU = CPU;
-
- SHORTREL( &glThreadListLock );
-
- return thread;
-}
-
-// Acquire mutex (see mutex.h for documentation)
-int 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
- us = Threads_RemActive();
- us->Next = NULL;
- // - Mark as sleeping
- us->Status = THREAD_STAT_MUTEXSLEEP;
- us->WaitPointer = Mutex;
-
- // - Add to waiting
- if(Mutex->LastWaiting) {
- Mutex->LastWaiting->Next = us;
- Mutex->LastWaiting = us;
- }
- else {
- Mutex->Waiting = us;
- Mutex->LastWaiting = us;
- }
-
- #if DEBUG_TRACE_STATE
- Log("%p (%i %s) waiting on mutex %p",
- us, us->TID, us->ThreadName, Mutex);
- #endif
-
- #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_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
-
- return 0;
-}
-
-// Release a mutex
-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!
- // 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 );
- if( Mutex->Owner->Status != THREAD_STAT_ACTIVE )
- Threads_AddActive(Mutex->Owner);
- SHORTREL( &glThreadListLock );
- }
- else {
- 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
-}
-
-// Check if a mutex is locked
-int Mutex_IsLocked(tMutex *Mutex)
-{
- return Mutex->Owner != NULL;
-}
-
-//
-// Initialise a semaphore
-//
-void Semaphore_Init(tSemaphore *Sem, int Value, int MaxValue, const char *Module, const char *Name)
-{
- memset(Sem, 0, sizeof(tSemaphore));
- Sem->Value = Value;
- Sem->ModName = Module;
- Sem->Name = Name;
- Sem->MaxValue = MaxValue;
-}
-//
-// Wait for items to be avaliable
-//
-int Semaphore_Wait(tSemaphore *Sem, int MaxToTake)
-{
- tThread *us;
- int taken;
- if( MaxToTake < 0 ) {
- Log_Warning("Threads", "Semaphore_Wait: User bug - MaxToTake(%i) < 0, Sem=%p(%s)",
- MaxToTake, Sem, Sem->Name);
- }
-
- SHORTLOCK( &Sem->Protector );
-
- // Check if there's already items avaliable
- if( Sem->Value > 0 ) {
- // Take what we need
- if( MaxToTake && Sem->Value > MaxToTake )
- taken = MaxToTake;
- else
- taken = Sem->Value;
- Sem->Value -= taken;
- SHORTREL( &Sem->Protector );
- }
- else
- {
- SHORTLOCK( &glThreadListLock );
-
- // - Remove from active list
- us = Threads_RemActive();
- us->Next = NULL;
- // - Mark as sleeping
- us->Status = THREAD_STAT_SEMAPHORESLEEP;
- us->WaitPointer = Sem;
- us->RetStatus = MaxToTake; // Use RetStatus as a temp variable
-
- // - Add to waiting
- if(Sem->LastWaiting) {
- Sem->LastWaiting->Next = us;
- Sem->LastWaiting = us;
- }
- else {
- Sem->Waiting = us;
- Sem->LastWaiting = us;
- }
-
- #if DEBUG_TRACE_STATE || SEMAPHORE_DEBUG
- Log("%p (%i %s) waiting on semaphore %p %s:%s",
- us, us->TID, us->ThreadName,
- Sem, Sem->ModName, Sem->Name);
- #endif
-
- SHORTREL( &Sem->Protector ); // Release first to make sure it is released
- SHORTREL( &glThreadListLock );
- while(us->Status == THREAD_STAT_SEMAPHORESLEEP) Threads_Yield();
- // We're only woken when there's something avaliable
- us->WaitPointer = NULL;
-
- taken = us->RetStatus;
-
- // Get the lock again
- SHORTLOCK( &Sem->Protector );
- }
-
- // While there is space, and there are thread waiting
- // wake the first thread and give it what it wants (or what's left)
- while( (Sem->MaxValue == 0 || Sem->Value < Sem->MaxValue) && Sem->Signaling )
- {
- int given;
- tThread *toWake = Sem->Signaling;
-
- Sem->Signaling = Sem->Signaling->Next;
- // Reset ->LastWaiting to NULL if we have just removed the last waiting thread
- if( Sem->Signaling == NULL )
- Sem->LastSignaling = NULL;
-
- // Figure out how much to give
- if( toWake->RetStatus && Sem->Value + toWake->RetStatus < Sem->MaxValue )
- given = toWake->RetStatus;
- else
- given = Sem->MaxValue - Sem->Value;
- Sem->Value -= given;
-
-
- #if DEBUG_TRACE_STATE || SEMAPHORE_DEBUG
- Log("%p (%i %s) woken by wait on %p %s:%s",
- toWake, toWake->TID, toWake->ThreadName,
- Sem, Sem->ModName, Sem->Name);
- #endif
-
- // Save the number we gave to the thread's status
- toWake->RetStatus = given;
-
- // Wake the sleeper
- SHORTLOCK( &glThreadListLock );
- if( toWake->Status != THREAD_STAT_ACTIVE )
- Threads_AddActive(toWake);
- SHORTREL( &glThreadListLock );
- }
- SHORTREL( &Sem->Protector );
-
- return taken;
-}
-
-//
-// Add items to a semaphore
-//
-int Semaphore_Signal(tSemaphore *Sem, int AmmountToAdd)
-{
- int given;
- int added;
-
- if( AmmountToAdd < 0 ) {
- Log_Warning("Threads", "Semaphore_Signal: User bug - AmmountToAdd(%i) < 0, Sem=%p(%s)",
- AmmountToAdd, Sem, Sem->Name);
- }
- SHORTLOCK( &Sem->Protector );
-
- // Check if we have to block
- if( Sem->MaxValue && Sem->Value == Sem->MaxValue )
- {
- tThread *us;
- #if 0
- Log_Debug("Threads", "Semaphore_Signal: IDLE Sem = %s:%s", Sem->ModName, Sem->Name);
- Log_Debug("Threads", "Semaphore_Signal: Sem->Value(%i) == Sem->MaxValue(%i)", Sem->Value, Sem->MaxValue);
- #endif
-
- SHORTLOCK( &glThreadListLock );
- // - Remove from active list
- us = Threads_RemActive();
- us->Next = NULL;
- // - Mark as sleeping
- us->Status = THREAD_STAT_SEMAPHORESLEEP;
- us->WaitPointer = Sem;
- us->RetStatus = AmmountToAdd; // Use RetStatus as a temp variable
-
- // - Add to waiting
- if(Sem->LastSignaling) {
- Sem->LastSignaling->Next = us;
- Sem->LastSignaling = us;
- }
- else {
- Sem->Signaling = us;
- Sem->LastSignaling = us;
- }
-
- #if DEBUG_TRACE_STATE || SEMAPHORE_DEBUG
- Log("%p (%i %s) signaling semaphore %p %s:%s",
- us, us->TID, us->ThreadName,
- Sem, Sem->ModName, Sem->Name);
- #endif
-
- SHORTREL( &glThreadListLock );
- SHORTREL( &Sem->Protector );
- while(us->Status == THREAD_STAT_SEMAPHORESLEEP) Threads_Yield();
- // We're only woken when there's something avaliable
- us->WaitPointer = NULL;
-
- added = us->RetStatus;
-
- // Get the lock again
- SHORTLOCK( &Sem->Protector );
- }
- // Non blocking
- else
- {
- // Figure out how much we need to take off
- if( Sem->MaxValue && Sem->Value + AmmountToAdd > Sem->MaxValue)
- added = Sem->MaxValue - Sem->Value;
- else
- added = AmmountToAdd;
- Sem->Value += added;
- }
-
- // While there are items avaliable, and there are thread waiting
- // wake the first thread and give it what it wants (or what's left)
- while( Sem->Value && Sem->Waiting )
- {
- tThread *toWake = Sem->Waiting;
-
- // Remove thread from list (double ended, so clear LastWaiting if needed)
- Sem->Waiting = Sem->Waiting->Next;
- if( Sem->Waiting == NULL )
- Sem->LastWaiting = NULL;
-
- // Figure out how much to give to woken thread
- // - Requested count is stored in ->RetStatus
- if( toWake->RetStatus && Sem->Value > toWake->RetStatus )
- given = toWake->RetStatus;
- else
- given = Sem->Value;
- Sem->Value -= given;
-
- // Save the number we gave to the thread's status
- toWake->RetStatus = given;
-
- if(toWake->bInstrTrace)
- Log("%s(%i) given %i from %p", toWake->ThreadName, toWake->TID, given, Sem);
- #if DEBUG_TRACE_STATE || SEMAPHORE_DEBUG
- Log("%p (%i %s) woken by signal on %p %s:%s",
- toWake, toWake->TID, toWake->ThreadName,
- Sem, Sem->ModName, Sem->Name);
- #endif
-
- // Wake the sleeper
- SHORTLOCK( &glThreadListLock );
- if( toWake->Status != THREAD_STAT_ACTIVE )
- Threads_AddActive(toWake);
- else
- Warning("Thread %p (%i %s) is already awake", toWake, toWake->TID, toWake->ThreadName);
- SHORTREL( &glThreadListLock );
- }
- SHORTREL( &Sem->Protector );
-
- return added;
-}
-
-//
-// Get the current value of a semaphore
-//
-int Semaphore_GetValue(tSemaphore *Sem)
-{
- return Sem->Value;
-}
-
-// === EXPORTS ===
-EXPORT(Threads_GetUID);
-EXPORT(Threads_GetGID);
-EXPORT(Mutex_Acquire);
-EXPORT(Mutex_Release);
-EXPORT(Mutex_IsLocked);
-EXPORT(Semaphore_Init);
-EXPORT(Semaphore_Wait);
-EXPORT(Semaphore_Signal);
git.ucc.asn.au / tpg / acess2.git / blobdiff
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