Make append and setLastQueuedCommand atomic

Two threads can enqueue to the same HostQueue (HostQueue::enqueue)
and result in last queued command being the first one reachine queue_.enqueue

NOTE: Temporarly make setLastQueuedCommand empty function to pass the build

Change-Id: Id09c3a28d184986f52b2ec86a2f6a18c40df1f0b

rocclr/platform/command.cpp

@@ -258,9 +258,6 @@ void Command::enqueue() {
 
   ClPrint(LOG_DEBUG, LOG_CMD, "command is enqueued: %p", this);
   queue_->append(*this);
-  if (IS_HIP) {
-    queue_->setLastQueuedCommand(this);
-  }
   queue_->flush();
   if ((queue_->device().settings().waitCommand_ && (type_ != 0)) ||
       ((commandWaitBits_ & 0x2) != 0)) {

rocclr/platform/commandqueue.cpp

@@ -185,7 +185,17 @@ void HostQueue::append(Command& command) {
   }
   command.retain();
   command.setStatus(CL_QUEUED);
+  ScopedLock l(lastCmdLock_);
   queue_.enqueue(&command);
+  if (!IS_HIP) {
+    return;
+  }
+  // Set last submitted command
+  if (lastEnqueueCommand_ != nullptr) {
+    lastEnqueueCommand_->release();
+  }
+  lastEnqueueCommand_ = &command;
+  lastEnqueueCommand_->retain();
 }
 
 bool HostQueue::isEmpty() {
@@ -193,18 +203,6 @@ bool HostQueue::isEmpty() {
   return queue_.empty();
 }
 
-void HostQueue::setLastQueuedCommand(Command* lastCommand) {
-  // Set last submitted command
-  ScopedLock l(lastCmdLock_);
-  if (lastEnqueueCommand_ != nullptr) {
-    lastEnqueueCommand_->release();
-  }
-  lastEnqueueCommand_ = lastCommand;
-  if (lastCommand != nullptr) {
-    lastEnqueueCommand_->retain();
-  }
-}
-
 Command* HostQueue::getLastQueuedCommand(bool retain) {
   // Get last submitted command
   ScopedLock l(lastCmdLock_);

rocclr/platform/commandqueue.hpp

@@ -236,7 +236,7 @@ class HostQueue : public CommandQueue {
   Command* getLastQueuedCommand(bool retain);
 
   //! Set last enqueued command
-  void setLastQueuedCommand(Command* lastCommand);
+  void setLastQueuedCommand(Command* lastCommand) {}
 };