X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=KernelLand%2FKernel%2Fvfs%2Fselect.c;h=a18b91c58dce0fe1a65d7b376f969ca201426403;hb=9c4eedf4893f851bd1ba60ce541c8d098a9ef7f7;hp=412cb1aeddb70c517a63802bc5eda5f7067a12cb;hpb=8dcc3e209d0d728565a18c8dca2b0ba220b74a6f;p=tpg%2Facess2.git

diff --git a/KernelLand/Kernel/vfs/select.c b/KernelLand/Kernel/vfs/select.c
index 412cb1ae..a18b91c5 100644
--- a/KernelLand/Kernel/vfs/select.c
+++ b/KernelLand/Kernel/vfs/select.c
@@ -5,7 +5,6 @@
  * select.c
  * - Implements the select() system call (and supporting code)
  *
- * TODO: Implment timeouts (via an alarm event?)
  * TODO: Remove malloc for read/write queues
  */
 #define DEBUG	0
@@ -56,13 +55,14 @@ void	VFS_int_Select_SignalAll(tVFS_SelectList *List);
 // === FUNCTIONS ===
 int VFS_SelectNode(tVFS_Node *Node, int TypeFlags, tTime *Timeout, const char *Name)
 {
-	tThread	*thisthread = Proc_GetCurThread();
-	 int	ret, type;
+	tThread	* const thisthread = Proc_GetCurThread();
+	 int	ret;
 	
 	ENTER("pNode iTypeFlags pTimeout sName", Node, TypeFlags, Timeout, Name);
 	
 	// Initialise
-	for( type = 0; type < 3; type ++ )
+	ret = 0;
+	for( int type = 0; type < 3; type ++ )
 	{
 		tVFS_SelectList	**list;
 		 int	*flag, wanted, maxAllowed;
@@ -78,41 +78,43 @@ int VFS_SelectNode(tVFS_Node *Node, int TypeFlags, tTime *Timeout, const char *N
 		VFS_int_Select_AddThread(*list, thisthread, maxAllowed);
 		if( *flag == wanted )
 		{
-			VFS_int_Select_RemThread(*list, thisthread);
-			LEAVE('i', 1);
-			return 1;
+			ret |= (1 << type);
 		}
 	}
 
 	// Wait for things	
-	if( !Timeout )
+	if( ret )
+	{
+		// Skip wait, conditions already met
+		LOG("ret = %i, skipping wait", ret);
+	}
+	else if( !Timeout )
 	{
 		LOG("Semaphore_Wait()");
-		// TODO: Actual timeout
-		Threads_WaitEvents( THREAD_EVENT_VFS );
+		Threads_WaitEvents( THREAD_EVENT_VFS|THREAD_EVENT_SIGNAL );
 	}
 	else if( *Timeout > 0 )
 	{
 		tTimer *t = Time_AllocateTimer(NULL, NULL);
 		// Clear timer event
 		Threads_ClearEvent( THREAD_EVENT_TIMER );
-		// TODO: Convert *Timeout?
 		LOG("Timeout %lli ms", *Timeout);
 		Time_ScheduleTimer( t, *Timeout );
 		// Wait for the timer or a VFS event
-		Threads_WaitEvents( THREAD_EVENT_VFS|THREAD_EVENT_TIMER );
+		Threads_WaitEvents( THREAD_EVENT_VFS|THREAD_EVENT_TIMER|THREAD_EVENT_SIGNAL );
 		Time_FreeTimer(t);
 	}
 	
 	// Get return value
 	ret = 0;
-	for( type = 0; type < 3; type ++ )
+	for( int type = 0; type < 3; type ++ )
 	{
 		tVFS_SelectList	**list;
 		 int	*flag, wanted, maxAllowed;
 		if( !(TypeFlags & (1 << type)) )	continue;
 		VFS_int_Select_GetType(type, Node, &list, &flag, &wanted, &maxAllowed);
-		LOG("VFS_int_Select_RemThread()");
+		LOG("VFS_int_Select_RemThread() for %i", type);
+		ASSERT(*list);
 		VFS_int_Select_RemThread(*list, thisthread);
 		ret = ret || *flag == wanted;
 	}
@@ -129,8 +131,8 @@ int VFS_Select(int MaxHandle, fd_set *ReadHandles, fd_set *WriteHandles, fd_set
 	tThread	*thisthread = Proc_GetCurThread();
 	 int	ret;
 	
-	ENTER("iMaxHandle pReadHandles pWriteHandles pErrHandles pTimeout bIsKernel",
-		MaxHandle, ReadHandles, WriteHandles, ErrHandles, Timeout, IsKernel);
+	ENTER("iMaxHandle pReadHandles pWriteHandles pErrHandles pTimeout xExtraEvents bIsKernel",
+		MaxHandle, ReadHandles, WriteHandles, ErrHandles, Timeout, ExtraEvents, IsKernel);
 	
 	// Notes: The idea is to make sure we only enter wait (Threads_WaitEvents)
 	// if we are going to be woken up (either by an event at a later time,
@@ -140,6 +142,8 @@ int VFS_Select(int MaxHandle, fd_set *ReadHandles, fd_set *WriteHandles, fd_set
 	// or the semaphore is incremeneted (or both, but never none)
 	
 	// Register with nodes
+	if( ReadHandles )
+		LOG(" - ReadHandles[0] = %x", ReadHandles->flags[0]);
 	ret  = VFS_int_Select_Register(thisthread, MaxHandle, ReadHandles, 0, IsKernel);
 	ret += VFS_int_Select_Register(thisthread, MaxHandle, WriteHandles, 1, IsKernel);
 	ret += VFS_int_Select_Register(thisthread, MaxHandle, ErrHandles, 2, IsKernel);
@@ -149,9 +153,11 @@ int VFS_Select(int MaxHandle, fd_set *ReadHandles, fd_set *WriteHandles, fd_set
 	// If there were events waiting, de-register and return
 	if( ret > 0 )
 	{
+		LOG(" - ReadHandles[0] = %x", ReadHandles->flags[0]);
 		ret  = VFS_int_Select_Deregister(thisthread, MaxHandle, ReadHandles, 0, IsKernel);
 		ret += VFS_int_Select_Deregister(thisthread, MaxHandle, WriteHandles, 1, IsKernel);
 		ret += VFS_int_Select_Deregister(thisthread, MaxHandle, ErrHandles, 2, IsKernel);
+		LOG(" - ReadHandles[0] = %x", ReadHandles->flags[0]);
 		LEAVE('i', ret);
 		return ret;
 	}
@@ -159,9 +165,9 @@ int VFS_Select(int MaxHandle, fd_set *ReadHandles, fd_set *WriteHandles, fd_set
 	// Wait for things	
 	if( !Timeout )
 	{
-		LOG("Semaphore_Wait()");
+		LOG("Waiting for VFS/SIGNAL events (Plus 0x%x)", ExtraEvents);
 		// TODO: Actual timeout
-		Threads_WaitEvents( THREAD_EVENT_VFS|ExtraEvents );
+		Threads_WaitEvents( THREAD_EVENT_VFS|THREAD_EVENT_SIGNAL|ExtraEvents );
 	}
 	else if( *Timeout > 0 )
 	{
@@ -176,6 +182,7 @@ int VFS_Select(int MaxHandle, fd_set *ReadHandles, fd_set *WriteHandles, fd_set
 		Time_FreeTimer(t);
 	}
 	// Fill output (modify *Handles)
+	LOG("De-registering");
 	// - Also, de-register
 	ret  = VFS_int_Select_Deregister(thisthread, MaxHandle, ReadHandles, 0, IsKernel);
 	ret += VFS_int_Select_Deregister(thisthread, MaxHandle, WriteHandles, 1, IsKernel);
@@ -191,6 +198,7 @@ int VFS_Select(int MaxHandle, fd_set *ReadHandles, fd_set *WriteHandles, fd_set
 // Mark a node as having data ready for reading
 int VFS_MarkAvaliable(tVFS_Node *Node, BOOL IsDataAvaliable)
 {
+	ASSERTR(Node, 1);
 	ENTER("pNode bIsDataAvaliable", Node, IsDataAvaliable);
 	Node->DataAvaliable = !!IsDataAvaliable;
 	if( Node->DataAvaliable )
@@ -202,6 +210,7 @@ int VFS_MarkAvaliable(tVFS_Node *Node, BOOL IsDataAvaliable)
 // Mark a node as having a full buffer
 int VFS_MarkFull(tVFS_Node *Node, BOOL IsBufferFull)
 {
+	ASSERTR(Node, 1);
 	ENTER("pNode bIsBufferFull", Node, IsBufferFull);
 	Node->BufferFull = !!IsBufferFull;
 	if( !Node->BufferFull )
@@ -213,6 +222,7 @@ int VFS_MarkFull(tVFS_Node *Node, BOOL IsBufferFull)
 // Mark a node as errored
 int VFS_MarkError(tVFS_Node *Node, BOOL IsErrorState)
 {
+	ASSERTR(Node, 1);
 	ENTER("pNode bIsErrorState", Node, IsErrorState);
 	Node->ErrorOccurred = !!IsErrorState;
 	if( Node->ErrorOccurred )
@@ -306,8 +316,10 @@ int VFS_int_Select_Register(tThread *Thread, int MaxHandle, fd_set *Handles, int
 		}
 		
 		// Check for the flag
-		if( !!*flag == !!wantedFlagValue )
+		if( !!*flag == !!wantedFlagValue ) {
+			LOG(" %i == want %i", !!*flag, !!wantedFlagValue);
 			numFlagged ++;
+		}
 	}
 	
 	LEAVE('i', numFlagged);
@@ -348,8 +360,6 @@ int VFS_int_Select_Deregister(tThread *Thread, int MaxHandle, fd_set *Handles, i
 			continue;
 		}
 	
-		// Get the type of the listen
-	
 		// Get the type of the listen
 		if( VFS_int_Select_GetType(Type, handle->Node, &list, &flag, &wantedFlagValue, NULL) ) {
 			LEAVE('i', 0);
@@ -362,6 +372,8 @@ int VFS_int_Select_Deregister(tThread *Thread, int MaxHandle, fd_set *Handles, i
 		// Check for the flag
 		if( !!*flag == !!wantedFlagValue ) {
 			numFlagged ++;
+			LOG(" %i == want %i", !!*flag, !!wantedFlagValue);
+			FD_SET(i, Handles);
 		}
 		else {
 			FD_CLR(i, Handles);
@@ -440,7 +452,6 @@ int VFS_int_Select_AddThread(tVFS_SelectList *List, tThread *Thread, int MaxAllo
 
 void VFS_int_Select_RemThread(tVFS_SelectList *List, tThread *Thread)
 {
-	 int	i;
 	tVFS_SelectListEnt	*block, *prev = NULL;
 	
 	ENTER("pList pThread", List, Thread);
@@ -453,7 +464,7 @@ void VFS_int_Select_RemThread(tVFS_SelectList *List, tThread *Thread)
 	// Look for the thread
 	do
 	{
-		for( i = 0; i < NUM_THREADS_PER_ALLOC; i ++ )
+		for( int i = 0; i < NUM_THREADS_PER_ALLOC; i ++ )
 		{
 			if( block->Threads[i] == Thread )
 			{