Make debugger unloading deferred operation

This CL should make debugger handler setting an asynchronous operation for real.

Review URL: http://codereview.chromium.org/548045

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3624 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/debug.cc

@@ -2381,17 +2381,12 @@ void Debugger::ListenersChanged() {
   if (IsDebuggerActive()) {
     // Disable the compilation cache when the debugger is active.
     CompilationCache::Disable();
+    debugger_unload_pending_ = false;
   } else {
     CompilationCache::Enable();
-
     // Unload the debugger if event listener and message handler cleared.
-    if (Debug::InDebugger()) {
-      // If we are in debugger set the flag to unload the debugger when last
-      // EnterDebugger on the current stack is destroyed.
-      debugger_unload_pending_ = true;
-    } else {
-      UnloadDebugger();
-    }
+    // Schedule this for later, because we may be in non-V8 thread.
+    debugger_unload_pending_ = true;
   }
 }
 

src/debug.h

@@ -654,7 +654,9 @@ class Debugger {
 
     // Check whether the message handler was been cleared.
     if (debugger_unload_pending_) {
-      UnloadDebugger();
+      if (Debug::debugger_entry() == NULL) {
+        UnloadDebugger();
+      }
     }
 
     // Currently argument event is not used.

test/cctest/test-debug.cc

@@ -443,6 +443,9 @@ void CheckDebuggerUnloaded(bool check_functions) {
 
 // Check that the debugger has been fully unloaded.
 static void CheckDebuggerUnloaded(bool check_functions = false) {
+  // Let debugger to unload itself synchronously
+  v8::Debug::ProcessDebugMessages();
+
   v8::internal::CheckDebuggerUnloaded(check_functions);
 }