#include <threads.h>
#include <threads_int.h>
#include <errno.h>
+#include <hal_proc.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_RR_SIM 2 // Single Queue Round Robin
#define SCHED_RR_PRI 3 // Multi Queue Round Robin
// Set scheduler type
-#define SCHEDULER_TYPE SCHED_LOTTERY
+#define SCHEDULER_TYPE SCHED_RR_PRI
// === CONSTANTS ===
-#define DEFAULT_QUANTUM 10
+#define DEFAULT_QUANTUM 5
#define DEFAULT_PRIORITY 5
#define MIN_PRIORITY 10
-const enum eConfigTypes cCONFIG_TYPES[] = {
+const enum eConfigTypes cCONFIG_TYPES[NUM_CFG_ENTRIES] = {
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
+void Threads_Delete(tThread *Thread);
int Threads_SetName(const char *NewName);
#endif
char *Threads_GetName(int ID);
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);
#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 --
// --- 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 ---
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
Proc_Start();
}
+void Threads_Delete(tThread *Thread)
+{
+ // Set to dead
+ Thread->Status = THREAD_STAT_BURIED;
+
+ // Clear out process state
+ Proc_ClearThread(Thread);
+
+ // 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
}
/**
- * \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 *Threads_CloneTCB(Uint Flags)
{
tThread *cur, *new;
int i;
// 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;
}
/**
- * \fn tThread *Threads_CloneTCB(Uint *Err, Uint Flags)
- * \brief Clone the TCB of the current thread
+ * \brief Clone the TCB of the kernel thread
*/
tThread *Threads_CloneThreadZero(void)
{
- tThread *cur, *new;
+ tThread *new;
int i;
- cur = Proc_GetCurThread();
// Allocate and duplicate
new = malloc(sizeof(tThread));
new->LastMessage = NULL;
// Set State
- new->Remaining = new->Quantum = cur->Quantum;
- new->Priority = cur->Priority;
+ new->Remaining = new->Quantum = DEFAULT_QUANTUM;
+ new->Priority = DEFAULT_PRIORITY;
new->bInstrTrace = 0;
// Set Signal Handlers
new->CurFaultNum = 0;
- new->FaultHandler = cur->FaultHandler;
+ new->FaultHandler = 0;
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;
- }
+ new->Config[i] = 0;
}
// Maintain a global list of threads
// 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);
- }
+ // 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)
{
// TODO: Child return value?
if(Status) *Status = t->RetStatus;
// add to delete queue
- Threads_AddToDelete( t );
+ Threads_Delete( t );
break;
default:
if(Status) *Status = -1;
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
tMsg *msg;
int isCurThread = Thread == Proc_GetCurThread();
- // TODO: Kill all children
+ // TODO: Disown all children?
#if 1
{
tThread *child;
- // TODO: I should keep a .Parent pointer, and a .Children list
+ // TODO: I should keep a .Children list
for(child = gAllThreads;
child;
child = child->GlobalNext)
{
if(child->Parent == Thread)
- Threads_Kill(child, -1);
+ child->Parent = &gThreadZero;
}
}
#endif
}
break;
- // Brains!... You cannot kill
+ // 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);
// 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 );
- }
+
+ 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);
- // Release spinlocks
- SHORTREL( &glThreadListLock );
- SHORTREL( &Thread->IsLocked ); // TODO: We may not actually be released...
-
// And, reschedule
- if(isCurThread) {
+ if(isCurThread)
+ {
for( ;; )
- HALT();
+ Proc_Reschedule();
}
}
*/
void Threads_Yield(void)
{
- tThread *thread = Proc_GetCurThread();
- thread->Remaining = 0;
- //while(thread->Remaining == 0)
- HALT();
+// Log("Threads_Yield: by %p", __builtin_return_address(0));
+ Proc_Reschedule();
}
/**
// 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)
// 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
- SHORTREL( &glThreadListLock );
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;
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",
+ 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 ;
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
+ {
+ tThread *tmp, *prev = NULL;
+ #if SCHEDULER_TYPE == SCHED_RR_PRI
+ for( tmp = gaActiveThreads[Thread->Priority]; tmp; prev = tmp, tmp = tmp->Next );
+ if(prev)
+ prev->Next = Thread;
+ else
+ gaActiveThreads[Thread->Priority] = Thread;
+ #else
+ for( tmp = gActiveThreads; tmp; prev = tmp, tmp = tmp->Next );
+ if(prev)
+ prev->Next = Thread;
+ else
+ gActiveThreads = Thread;
+ #endif
+ Thread->Next = NULL;
+ }
// Update bookkeeping
giNumActiveThreads ++;
/**
* \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)
{
tThread *ret = Proc_GetCurThread();
-
- SHORTLOCK( &glThreadListLock );
+
+ 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
#endif
{
SHORTREL( &glThreadListLock );
+ Log_Warning("Threads", "Current thread %p(%i %s) is not on active queue",
+ ret, ret->TID, ret->ThreadName
+ );
return NULL;
}
GetCPUNum(), ret, ret->TID, ret->ThreadName, giFreeTickets);
#endif
- SHORTREL( &glThreadListLock );
-
return ret;
}
{
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();
}
*/
void Threads_SegFault(tVAddr Addr)
{
- Warning("Thread #%i committed a segfault at address %p", Proc_GetCurThread()->TID, 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 );
}
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;
}
// If we fall onto the same queue again, special handling is
// needed
- if( i == Last->Priority ) {
+ if( Last && Last->Status == THREAD_STAT_ACTIVE && i == Last->Priority ) {
tThread *savedThread = thread;
// Find the next unscheduled thread in the list
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
{
// Make the new thread non-schedulable
thread->CurCPU = CPU;
+ thread->Remaining = thread->Quantum;
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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