[cgutman] 45006: - Use a spin lock to protect the port bitmap instead of a fast mutex

Author: cgutman
Date: Fri Jan  8 19:21:52 2010
New Revision: 45006

URL: http://svn.reactos.org/svn/reactos?rev=45006&view=rev
Log:
 - Use a spin lock to protect the port bitmap instead of a fast mutex

Modified:
    branches/aicom-network-branch/drivers/network/tcpip/include/ports.h
    branches/aicom-network-branch/lib/drivers/ip/network/ports.c

Modified: branches/aicom-network-branch/drivers/network/tcpip/include/ports.h
URL:
http://svn.reactos.org/svn/reactos/branches/aicom-network-branch/drivers/ne…
==============================================================================
--- branches/aicom-network-branch/drivers/network/tcpip/include/ports.h [iso-8859-1]
(original)
+++ branches/aicom-network-branch/drivers/network/tcpip/include/ports.h [iso-8859-1] Fri
Jan  8 19:21:52 2010
@@ -16,7 +16,7 @@
     PVOID ProtoBitBuffer;
     UINT StartingPort;
     UINT PortsToOversee;
-    FAST_MUTEX Mutex;
+    KSPIN_LOCK Lock;
 } PORT_SET, *PPORT_SET;
 
 NTSTATUS PortsStartup( PPORT_SET PortSet,

Modified: branches/aicom-network-branch/lib/drivers/ip/network/ports.c
URL:
http://svn.reactos.org/svn/reactos/branches/aicom-network-branch/lib/driver…
==============================================================================
--- branches/aicom-network-branch/lib/drivers/ip/network/ports.c [iso-8859-1] (original)
+++ branches/aicom-network-branch/lib/drivers/ip/network/ports.c [iso-8859-1] Fri Jan  8
19:21:52 2010
@@ -24,7 +24,7 @@
 			 PortSet->ProtoBitBuffer,
 			 PortSet->PortsToOversee );
     RtlClearAllBits( &PortSet->ProtoBitmap );
-    ExInitializeFastMutex( &PortSet->Mutex );
+    KeInitializeSpinLock( &PortSet->Lock );
     return STATUS_SUCCESS;
 }
 
@@ -33,17 +33,20 @@
 }
 
 VOID DeallocatePort( PPORT_SET PortSet, ULONG Port ) {
+    KIRQL OldIrql;
+
     Port = htons(Port);
     ASSERT(Port >= PortSet->StartingPort);
     ASSERT(Port < PortSet->StartingPort + PortSet->PortsToOversee);
 
-    ExAcquireFastMutex( &PortSet->Mutex );
+    KeAcquireSpinLock( &PortSet->Lock, &OldIrql );
     RtlClearBits( &PortSet->ProtoBitmap, Port - PortSet->StartingPort, 1 );
-    ExReleaseFastMutex( &PortSet->Mutex );
+    KeReleaseSpinLock( &PortSet->Lock, OldIrql );
 }
 
 BOOLEAN AllocatePort( PPORT_SET PortSet, ULONG Port ) {
     BOOLEAN Clear;
+    KIRQL OldIrql;
 
     Port = htons(Port);
 
@@ -55,32 +58,34 @@
 
     Port -= PortSet->StartingPort;
 
-    ExAcquireFastMutex( &PortSet->Mutex );
+    KeAcquireSpinLock( &PortSet->Lock, &OldIrql );
     Clear = RtlAreBitsClear( &PortSet->ProtoBitmap, Port, 1 );
     if( Clear ) RtlSetBits( &PortSet->ProtoBitmap, Port, 1 );
-    ExReleaseFastMutex( &PortSet->Mutex );
+    KeReleaseSpinLock( &PortSet->Lock, OldIrql );
 
     return Clear;
 }
 
 ULONG AllocateAnyPort( PPORT_SET PortSet ) {
     ULONG AllocatedPort;
+    KIRQL OldIrql;
 
-    ExAcquireFastMutex( &PortSet->Mutex );
+    KeAcquireSpinLock( &PortSet->Lock, &OldIrql );
     AllocatedPort = RtlFindClearBits( &PortSet->ProtoBitmap, 1, 0 );
     if( AllocatedPort != (ULONG)-1 ) {
 	RtlSetBit( &PortSet->ProtoBitmap, AllocatedPort );
 	AllocatedPort += PortSet->StartingPort;
-	ExReleaseFastMutex( &PortSet->Mutex );
+	KeReleaseSpinLock( &PortSet->Lock, OldIrql );
 	return htons(AllocatedPort);
     }
-    ExReleaseFastMutex( &PortSet->Mutex );
+    KeReleaseSpinLock( &PortSet->Lock, OldIrql );
 
     return -1;
 }
 
 ULONG AllocatePortFromRange( PPORT_SET PortSet, ULONG Lowest, ULONG Highest ) {
     ULONG AllocatedPort;
+    KIRQL OldIrql;
 
     if ((Lowest < PortSet->StartingPort) ||
         (Highest >= PortSet->StartingPort + PortSet->PortsToOversee))
@@ -91,15 +96,15 @@
     Lowest -= PortSet->StartingPort;
     Highest -= PortSet->StartingPort;
 
-    ExAcquireFastMutex( &PortSet->Mutex );
+    KeAcquireSpinLock( &PortSet->Lock, &OldIrql );
     AllocatedPort = RtlFindClearBits( &PortSet->ProtoBitmap, 1, Lowest );
     if( AllocatedPort != (ULONG)-1 && AllocatedPort <= Highest) {
 	RtlSetBit( &PortSet->ProtoBitmap, AllocatedPort );
 	AllocatedPort += PortSet->StartingPort;
-	ExReleaseFastMutex( &PortSet->Mutex );
+	KeReleaseSpinLock( &PortSet->Lock, OldIrql );
 	return htons(AllocatedPort);
     }
-    ExReleaseFastMutex( &PortSet->Mutex );
+    KeReleaseSpinLock( &PortSet->Lock, OldIrql );
 
     return -1;
 }