diff --git a/lib/concurrent/test/BlockingDequeueUnitTest.cpp b/lib/concurrent/test/BlockingDequeueUnitTest.cpp
index 293c89fd..e0d4dd46 100644
--- a/lib/concurrent/test/BlockingDequeueUnitTest.cpp
+++ b/lib/concurrent/test/BlockingDequeueUnitTest.cpp
@@ -120,7 +120,33 @@ TEST(BlockingDequeueUnitTest, take_is_last) {
     ASSERT_EQ(dequeue.take(), 222);
 }
 
-TEST(BlockingDequeueUnitTest, poll_is_block_when_empty) {
+TEST(BlockingDequeueUnitTest, poll_is_not_block_when_empty) {
+	size_t capacity = 1;
+	bool isOk;
+	auto conditionVar = new MockConditionVar();
+	PIBlockingDequeue<int> dequeue(capacity, conditionVar);
+	dequeue.poll(111, &isOk);
+	EXPECT_FALSE(conditionVar->isWaitForCalled);
+}
+
+TEST(BlockingDequeueUnitTest, poll_is_default_value_when_empty) {
+	size_t capacity = 1;
+	bool isOk;
+	auto conditionVar = new MockConditionVar();
+	PIBlockingDequeue<int> dequeue(capacity, conditionVar);
+	ASSERT_EQ(dequeue.poll(111, &isOk), 111);
+}
+
+TEST(BlockingDequeueUnitTest, poll_is_offer_value_when_not_empty) {
+	size_t capacity = 1;
+	bool isOk;
+	auto conditionVar = new MockConditionVar();
+	PIBlockingDequeue<int> dequeue(capacity, conditionVar);
+	dequeue.offer(111);
+	ASSERT_EQ(dequeue.poll(-1, &isOk), 111);
+}
+
+TEST(BlockingDequeueUnitTest, poll_timeouted_is_block_when_empty) {
     size_t capacity = 1;
     int timeout = 11;
     auto conditionVar = new MockConditionVar();
@@ -131,7 +157,7 @@ TEST(BlockingDequeueUnitTest, poll_is_block_when_empty) {
     ASSERT_FALSE(conditionVar->isTrueCondition);
 }
 
-TEST(BlockingDequeueUnitTest, poll_is_default_value_when_empty) {
+TEST(BlockingDequeueUnitTest, poll_timeouted_is_default_value_when_empty) {
     size_t capacity = 1;
     int timeout = 11;
     auto conditionVar = new MockConditionVar();
@@ -139,7 +165,7 @@ TEST(BlockingDequeueUnitTest, poll_is_default_value_when_empty) {
     ASSERT_EQ(dequeue.poll(timeout, 111), 111);
 }
 
-TEST(BlockingDequeueUnitTest, poll_is_not_block_when_not_empty) {
+TEST(BlockingDequeueUnitTest, poll_timeouted_is_not_block_when_not_empty) {
     size_t capacity = 1;
     int timeout = 11;
     auto conditionVar = new MockConditionVar();
@@ -151,7 +177,7 @@ TEST(BlockingDequeueUnitTest, poll_is_not_block_when_not_empty) {
     ASSERT_TRUE(conditionVar->isTrueCondition);
 }
 
-TEST(BlockingDequeueUnitTest, poll_is_offer_value_when_not_empty) {
+TEST(BlockingDequeueUnitTest, poll_timeouted_is_offer_value_when_not_empty) {
     size_t capacity = 1;
     int timeout = 11;
     auto conditionVar = new MockConditionVar();
@@ -160,7 +186,7 @@ TEST(BlockingDequeueUnitTest, poll_is_offer_value_when_not_empty) {
     ASSERT_EQ(dequeue.poll(timeout, -1), 111);
 }
 
-TEST(BlockingDequeueUnitTest, poll_is_last) {
+TEST(BlockingDequeueUnitTest, poll_timeouted_is_last) {
     size_t capacity = 10;
     auto conditionVar = new MockConditionVar();
     PIBlockingDequeue<int> dequeue(capacity, conditionVar);
diff --git a/lib/main/concurrent/piblockingdequeue.h b/lib/main/concurrent/piblockingdequeue.h
index 7ec78f11..5f64da06 100644
--- a/lib/main/concurrent/piblockingdequeue.h
+++ b/lib/main/concurrent/piblockingdequeue.h
@@ -136,9 +136,11 @@ public:
 	 *
 	 * @param timeoutMs how long to wait before giving up, in milliseconds
 	 * @param defaultVal value, which returns if the specified waiting time elapses before an element is available
+	 * @param isOk flag, which indicates result of method execution. It will be set to false if timeout, or true if
+	 * return value is retrieved value
 	 * @return the head of this queue, or defaultVal if the specified waiting time elapses before an element is available
 	 */
-	T poll(int timeoutMs, const T & defaultVal, bool* isOk = nullptr) {
+	T poll(int timeoutMs, const T & defaultVal = T(), bool* isOk = nullptr) {
 		T t;
 		mutex.lock();
 		bool isNotEmpty = cond_var_add->waitFor(mutex, timeoutMs, [&]() { return !PIDeque<T>::isEmpty(); });
@@ -149,6 +151,26 @@ public:
 		return t;
 	}
 
+	/**
+	 * @brief Retrieves and removes the head of this queue and return it if queue not empty, otherwise return defaultVal.
+	 * Do it immediately without waiting.
+	 *
+	 * @param defaultVal value, which returns if the specified waiting time elapses before an element is available
+	 * @param isOk flag, which indicates result of method execution. It will be set to false if timeout, or true if
+	 * return value is retrieved value
+	 * @return the head of this queue, or defaultVal if the specified waiting time elapses before an element is available
+	 */
+	T poll(const T & defaultVal = T(), bool* isOk = nullptr) {
+		T t;
+		mutex.lock();
+		bool isNotEmpty = !PIDeque<T>::isEmpty();
+		t = isNotEmpty ? T(PIDeque<T>::take_front()) : defaultVal;
+		mutex.unlock();
+		if (isNotEmpty) cond_var_rem->notifyOne();
+		if (isOk != nullptr) *isOk = isNotEmpty;
+		return t;
+	}
+
 	/**
 	 * @brief Returns the number of elements that this queue can ideally (in the absence of memory or resource
 	 * constraints) contains. This is always equal to the initial capacity of this queue less the current size of this queue.