diff --git a/dlangide-monod-linux.dproj b/dlangide-monod-linux.dproj
index 23a6d04..66e9e98 100644
--- a/dlangide-monod-linux.dproj
+++ b/dlangide-monod-linux.dproj
@@ -33,6 +33,7 @@
         <String>USE_OPENGL</String>
         <String>USE_SDL</String>
         <String>USE_FREETYPE</String>
+        <String>USE_GDB_DEBUG</String>
         <String>EmbedStandardResources</String>
       </VersionIds>
     </VersionIds>
@@ -192,5 +193,9 @@
     <Compile Include="src\dlangide\workspace\workspace.d" />
     <Compile Include="src\ddebug\common\debugger.d" />
     <Compile Include="src\ddebug\common\queue.d" />
+    <Compile Include="src\ddebug\gdb\gdbinterface.d" />
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="src\ddebug\gdb\" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/ddebug/common/debugger.d b/src/ddebug/common/debugger.d
index 9c99a16..3176917 100644
--- a/src/ddebug/common/debugger.d
+++ b/src/ddebug/common/debugger.d
@@ -2,26 +2,106 @@ module ddebug.common.debugger;
 
 import core.thread;
 import dlangui.core.logger;
+import ddebug.common.queue;
+
+enum ResponseCode : int {
+	/// Operation finished successfully
+	Ok = 0,
+
+	// more success codes here
+
+	/// General purpose failure code
+	Fail = 1000,
+	/// method is not implemented
+	NotImplemented,
+	/// error running debugger
+	CannotRunDebugger,
+
+	// more error codes here
+}
+
+alias Runnable = void delegate();
+alias DebuggerResponse = void delegate(ResponseCode code, string msg);
 
 interface Debugger {
 	/// start debugging
-	void startDebugging(string executable, string[] args, string workingDir);
+	void startDebugging(string debuggerExecutable, string executable, string[] args, string workingDir, DebuggerResponse response);
 }
 
-interface DebuggerCallback {
+
+
+/// proxy for debugger interface implementing async calls
+class DebuggerProxy : Debugger {
+	private DebuggerBase _debugger;
+	private void delegate(Runnable runnable) _callbackDelegate;
+
+	this(DebuggerBase debugger, void delegate(Runnable runnable) callbackDelegate) {
+		_debugger = debugger;
+		_callbackDelegate = callbackDelegate;
+	}
+
+	void startDebugging(string debuggerExecutable, string executable, string[] args, string workingDir, DebuggerResponse response) {
+		_debugger.postRequest(delegate() {
+				_debugger.startDebugging(debuggerExecutable, executable, args, workingDir,
+					delegate(ResponseCode code, string msg) {
+						_callbackDelegate( delegate() { response(code, msg); } );
+					}
+				);
+		});
+	}
+
 }
 
-class DebuggerBase : Thread {
+class DebuggerBase : Thread, Debugger {
 	private bool _stopRequested;
 	private bool _finished;
+	protected string _debuggerExecutable;
+	protected BlockingQueue!Runnable _queue;
+
+	void postRequest(Runnable request) {
+		_queue.put(request);
+	}
 
 	this() {
 		super(&run);
+		_queue = new BlockingQueue!Runnable();
 	}
 
+	~this() {
+		stop();
+		destroy(_queue);
+		_queue = null;
+	}
+
+	void stop() {
+		Log.i("Debugger.stop()");
+		_stopRequested = true;
+		_queue.close();
+	}
+
+	protected void onDebuggerThreadStarted() {
+	}
+
+	protected void onDebuggerThreadFinished() {
+	}
+	
+	/// thread func: execute all tasks from queue
 	private void run() {
+		onDebuggerThreadStarted();
 		Log.i("Debugger thread started");
+		while (!_stopRequested) {
+			Runnable task;
+			if (_queue.get(task, 0)) {
+				task();
+			}
+		}
 		Log.i("Debugger thread finished");
 		_finished = true;
+		onDebuggerThreadFinished();
 	}
+
+	void startDebugging(string debuggerExecutable, string executable, string[] args, string workingDir, DebuggerResponse response) {
+		response(ResponseCode.NotImplemented, "Not Implemented");
+	}
+
 }
diff --git a/src/ddebug/common/queue.d b/src/ddebug/common/queue.d
index 2e2a643..d4669b9 100644
--- a/src/ddebug/common/queue.d
+++ b/src/ddebug/common/queue.d
@@ -82,7 +82,6 @@ class BlockingQueue(T) {
 			foreach(ref item; items) {
 				append(item);
 			}
-			append(item);
 			_condition.notifyAll();
 		}
 	}
@@ -99,7 +98,7 @@ class BlockingQueue(T) {
 			}
 			if (timeoutMillis <= 0)
 				_condition.wait(); // no timeout
-			else if (!_condition.wait(dur!msecs(timeoutMillis)))
+			else if (!_condition.wait(dur!"msecs"(timeoutMillis)))
 				return false; // timeout
 			if (_readPos < _writePos) {
 				value = _buffer[_readPos++];
@@ -122,7 +121,7 @@ class BlockingQueue(T) {
 				return true;
 			if (timeoutMillis <= 0)
 				_condition.wait(); // no timeout
-			else if (!_condition.wait(dur!msecs(timeoutMillis)))
+			else if (!_condition.wait(dur!"msecs"(timeoutMillis)))
 				return false; // timeout
 			while (_readPos < _writePos)
 				values ~= _buffer[_readPos++];
diff --git a/src/ddebug/gdb/gdbinterface.d b/src/ddebug/gdb/gdbinterface.d
new file mode 100644
index 0000000..76ea636
--- /dev/null
+++ b/src/ddebug/gdb/gdbinterface.d
@@ -0,0 +1,94 @@
+module ddebug.gdb.gdbinterface;
+
+public import ddebug.common.debugger;
+import dlangui.core.logger;
+import ddebug.common.queue;
+import dlangide.builders.extprocess;
+import std.utf;
+
+class ConsoleDebuggerInterface : DebuggerBase, TextWriter {
+	protected ExternalProcess _debuggerProcess;
+
+	protected ExternalProcessState runDebuggerProcess(string executable, string[]args, string dir) {
+		_debuggerProcess = new ExternalProcess();
+		ExternalProcessState state = _debuggerProcess.run(executable, args, dir, this);
+		return state;
+	}
+
+	private string[] _stdoutLines;
+	private char[] _stdoutBuf;
+	/// return true to clear lines list
+	protected bool onDebuggerStdoutLines(string[] lines) {
+		return true;
+	}
+	private void onStdoutText(string text) {
+		_stdoutBuf ~= text;
+		// pass full lines
+		int startPos = 0;
+		bool fullLinesFound = false;
+		for (int i = 0; i < _stdoutBuf.length; i++) {
+			if (_stdoutBuf[i] == '\n' || _stdoutBuf[i] == '\r') {
+				if (i <= startPos)
+					_stdoutLines ~= "";
+				else
+					_stdoutLines ~= _stdoutBuf[startPos .. i].dup;
+				fullLinesFound = true;
+				if (i + 1 < _stdoutBuf.length) {
+					if ((_stdoutBuf[i] == '\n' && _stdoutBuf[i + 1] == '\r')
+							|| (_stdoutBuf[i] == '\r' && _stdoutBuf[i + 1] == '\n'))
+						i++;
+				}
+				startPos = i + 1;
+			}
+		}
+		if (fullLinesFound) {
+			for (int i = 0; i + startPos < _stdoutBuf.length; i++)
+				_stdoutBuf[i] = _stdoutBuf[i + startPos];
+			_stdoutBuf.length = _stdoutBuf.length - startPos;
+			if (onDebuggerStdoutLines(_stdoutLines)) {
+				_stdoutLines.length = 0;
+			}
+		}
+	}
+
+	/// log lines
+	override void writeText(dstring text) {
+		string text8 = toUTF8(text);
+		postRequest(delegate() {
+				onStdoutText(text8);
+		});
+	}
+
+}
+
+class GDBInterface : ConsoleDebuggerInterface {
+
+	override void startDebugging(string debuggerExecutable, string executable, string[] args, string workingDir, DebuggerResponse response) {
+		string[] debuggerArgs;
+		debuggerArgs ~= "--interpreter=mi";
+		debuggerArgs ~= "--silent";
+		debuggerArgs ~= "--args";
+		debuggerArgs ~= executable;
+		foreach(arg; args)
+			debuggerArgs ~= arg;
+		ExternalProcessState state = runDebuggerProcess(debuggerExecutable, debuggerArgs, workingDir);
+		Log.i("Debugger process state:");
+		if (state == ExternalProcessState.Running) {
+			response(ResponseCode.Ok, "Started");
+		} else {
+			response(ResponseCode.CannotRunDebugger, "Error while trying to run debugger process");
+		}
+	}
+
+	override void stop() {
+		if (_debuggerProcess !is null)
+			_debuggerProcess.kill();
+		super.stop();
+	}
+
+	/// return true to clear lines list
+	override protected bool onDebuggerStdoutLines(string[] lines) {
+		Log.d("onDebuggerStdout ", lines);
+		return true;
+	}
+}
diff --git a/src/dlangide.d b/src/dlangide.d
index 799ba3b..643bfb5 100644
--- a/src/dlangide.d
+++ b/src/dlangide.d
@@ -59,14 +59,17 @@ extern (C) int UIAppMain(string[] args) {
     version(USE_WIN_DEBUG) {
         debuggerTest();
     }
+	version(USE_GDB_DEBUG) {
+		debuggerTest();
+	}
 
     // create window
     Window window = Platform.instance.createWindow("Dlang IDE", null, WindowFlag.Resizable, 800, 600);
     // set window icon
     window.windowIcon = drawableCache.getImage("dlangui-logo1");
 	
-    Widget w = new Widget();
-    pragma(msg, w.click.return_t, "", w.click.params_t);
+    //Widget w = new Widget();
+    //pragma(msg, w.click.return_t, "", w.click.params_t);
 
     IDEFrame frame = new IDEFrame(window);
 
@@ -93,6 +96,40 @@ version(USE_WIN_DEBUG) {
     }
 }
 
+version(USE_GDB_DEBUG) {
+	void debuggerTest() {
+		import ddebug.gdb.gdbinterface;
+		import core.thread;
+		Log.d("Testing GDB debugger");
+		DebuggerBase debugger = new DebuggerBase();
+		debugger.startDebugging("gdb", "test", [], "", delegate(ResponseCode code, string msg) {
+				Log.d("startDebugging result: ", code, " : ", msg);
+				//assert(code == ResponseCode.NotImplemented);
+			});
+		debugger.stop();
+		destroy(debugger);
+
+		// async
+
+		debugger = new GDBInterface();
+		DebuggerProxy proxy = new DebuggerProxy(debugger, delegate(Runnable runnable) {
+				runnable();
+			});
+		Log.d("calling debugger.start()");
+		debugger.start();
+		Log.d("calling proxy.startDebugging()");
+		proxy.startDebugging("gdb", "/home/lve/src/d/dlangide/test/gdbtest", ["param1", "param2"], "/home/lve/src/d/dlangide/test", delegate(ResponseCode code, string msg) {
+				Log.d("startDebugging result: ", code, " : ", msg);
+				//assert(code == ResponseCode.NotImplemented);
+			});
+		Thread.sleep(dur!"msecs"(2000));
+		debugger.stop();
+		Thread.sleep(dur!"msecs"(2000));
+		destroy(debugger);
+		Log.d("Testing of GDB debugger is finished");
+	}
+}
+
 unittest {
     void jsonTest() {
         import dlangui.core.settings;