diff --git a/libs/main/thread/piprotectedvariable.h b/libs/main/thread/piprotectedvariable.h
new file mode 100644
index 00000000..c5bc2b01
--- /dev/null
+++ b/libs/main/thread/piprotectedvariable.h
@@ -0,0 +1,60 @@
+/*! \file piprotectedvariable.h
+ * \ingroup Thread
+ * \~\brief
+ * \~english Thread-safe variable
+ * \~russian Потокобезопасная переменная
+ */
+/*
+	PIP - Platform Independent Primitives
+	Thread-safe variable
+	Ivan Pelipenko peri4ko@yandex.ru, Stephan Fomenko, Andrey Bychkov work.a.b@yandex.ru
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Lesser General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Lesser General Public License for more details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef PIPROTECTEDVARIABLE_H
+#define PIPROTECTEDVARIABLE_H
+
+#include "pimutex.h"
+
+
+template<typename T>
+class PIP_EXPORT PIProtectedVariable {
+public:
+	void set(const T & v) {
+		PIMutexLocker _ml(mutex);
+		var = v;
+	}
+	void set(T && v) {
+		PIMutexLocker _ml(mutex);
+		var = std::move(v);
+	}
+	T get() const {
+		PIMutexLocker _ml(mutex);
+		return var;
+	}
+	T & lock() {
+		mutex.lock();
+		return var;
+	}
+	void unlock() { mutex.unlock(); }
+
+
+private:
+	mutable PIMutex mutex;
+	T var;
+};
+
+
+#endif
diff --git a/libs/main/thread/pithreadmodule.h b/libs/main/thread/pithreadmodule.h
index e4e0733d..b9a98069 100644
--- a/libs/main/thread/pithreadmodule.h
+++ b/libs/main/thread/pithreadmodule.h
@@ -55,6 +55,7 @@
 #include "pigrabberbase.h"
 #include "pimutex.h"
 #include "pipipelinethread.h"
+#include "piprotectedvariable.h"
 #include "pispinlock.h"
 #include "pithread.h"
 #include "pithreadnotifier.h"
diff --git a/main.cpp b/main.cpp
index 764a1f9d..38593865 100644
--- a/main.cpp
+++ b/main.cpp
@@ -8,12 +8,50 @@
 #include "pilog.h"
 #include "pimathbase.h"
 #include "pip.h"
+#include "piprotectedvariable.h"
 #include "pitranslator_p.h"
 #include "pivaluetree_conversions.h"
 
 using namespace PICoutManipulators;
 
+class MyStr: public PIString {
+public:
+	MyStr(): PIString() {}
+	MyStr(const char * o): PIString(o) { piCout << "MyStr *"; }
+	MyStr(const MyStr & o): PIString(o) { piCout << "MyStr &"; }
+	// MyStr(const MyStr & o): PIString(o) { piCout << "MyStr &"; }
+	MyStr(MyStr && o): PIString(o) { piCout << "MyStr &&"; }
+	MyStr & operator=(const MyStr & o) {
+		*this += o;
+		piCout << "MyStr =&";
+		return *this;
+	}
+	MyStr & operator=(MyStr && o) {
+		*this += o;
+		piCout << "MyStr =&&";
+		return *this;
+	}
+};
+
+
 int main(int argc, char * argv[]) {
+	PIProtectedVariable<MyStr> var;
+	// MyStr s("hello");
+	var.set("hello");
+	auto & v = var.lock();
+	// v        = "world";
+	var.unlock();
+	piCout << var.get();
+
+	/*PICodeParser parser;
+	parser.parseFile("client_server.h");
+	for (auto m: parser.enums) {
+		piCout << "";
+		piCout << m.name; // << m.args << m.value;
+						  // piCout << m.expand({"hello"});
+	}*/
+
+	return 0;
 	PITranslator::loadLang("ru");
 	PISerial f("COM123");
 	f.open();
@@ -47,14 +85,6 @@ int main(int argc, char * argv[]) {
 	piCout << "hello!"_tr("Co") << "hello!"_tr;*/
 	// piCout << "hello!"_trNoOp;
 
-	//  PICodeParser parser;
-	//  parser.parseFile("cmg_test.h");
-	/*for (auto m: parser.macros) {
-		piCout << "";
-		piCout << m.name << m.args << m.value;
-		piCout << m.expand({"hello"});
-	}
-*/
 
 	/*PISet<int> set;
 	piCout << set << piSerialize(set) << piDeserialize<PISet<int>>(piSerialize(set));