Kernel: Mark BlockCondition subclasses as final

Kernel/FileSystem/File.h

@@ -21,7 +21,7 @@ namespace Kernel {
 
 class File;
 
-class FileBlockCondition : public Thread::BlockCondition {
+class FileBlockCondition final : public Thread::BlockCondition {
 public:
     FileBlockCondition() { }
 

Kernel/FileSystem/Plan9FileSystem.h

@@ -50,7 +50,7 @@ private:
 
     class Blocker;
 
-    class Plan9FSBlockCondition : public Thread::BlockCondition {
+    class Plan9FSBlockCondition final : public Thread::BlockCondition {
     public:
         Plan9FSBlockCondition(Plan9FS& fs)
             : m_fs(fs)

Kernel/FutexQueue.h

@@ -14,7 +14,7 @@
 
 namespace Kernel {
 
-class FutexQueue
+class FutexQueue final
     : public RefCounted<FutexQueue>
     , public Thread::BlockCondition {
 public:

Kernel/Net/Routing.cpp

@@ -55,7 +55,7 @@ private:
     bool m_should_block { true };
 };
 
-class ARPTableBlockCondition : public Thread::BlockCondition {
+class ARPTableBlockCondition final : public Thread::BlockCondition {
 public:
     void unblock(const IPv4Address& ip_addr, const MACAddress& addr)
     {

Kernel/Thread.h

@@ -1225,7 +1225,7 @@ private:
 
     friend class WaitQueue;
 
-    class JoinBlockCondition : public BlockCondition {
+    class JoinBlockCondition final : public BlockCondition {
     public:
         void thread_did_exit(void* exit_value)
         {

Kernel/WaitQueue.h

@@ -12,7 +12,7 @@
 
 namespace Kernel {
 
-class WaitQueue : public Thread::BlockCondition {
+class WaitQueue final : public Thread::BlockCondition {
 public:
     u32 wake_one();
     u32 wake_n(u32 wake_count);