diff --git a/ethread/PoolExecutor.cpp b/ethread/PoolExecutor.cpp
index e6393f9..cd1e2c5 100644
--- a/ethread/PoolExecutor.cpp
+++ b/ethread/PoolExecutor.cpp
@@ -30,12 +30,11 @@ void ethread::PoolExecutor::threadCallback() {
 		// get an action:
 		m_action = m_pool.getAction();
 		if (m_action == nullptr) {
-			ethread::UniqueLock lock(m_mutex);
 			// If no action availlable and not requested to check, just sleep ...
 			if (m_needProcess == false) {
 				m_isWaiting = true;
 				ETHREAD_VERBOSE("RUN: Jump in sleep");
-				if (m_condition.wait_for(lock, std::chrono::seconds(60)) == std::cv_status::timeout) {
+				if (m_semaphore.wait(60000000) == false) {
 					ETHREAD_VERBOSE("RUN: time-out");
 					continue;
 				}
@@ -56,11 +55,8 @@ void ethread::PoolExecutor::threadCallback() {
 void ethread::PoolExecutor::start() {
 	ETHREAD_DEBUG("START: thread in Pool [START]");
 	m_running = true;
-	{
-		ethread::UniqueLock lock(m_mutex);
-		m_condition.notify_all();
-	}
-	m_thread = ememory::makeShared<ethread::Thread>([&](void *){ this->threadCallback();}, nullptr);
+	m_semaphore.post();
+	m_thread = ememory::makeShared<ethread::Thread>([&](){ threadCallback();});
 	if (m_thread == nullptr) {
 		m_running = false;
 		ETHREAD_ERROR("START: thread in Pool [STOP] can not intanciate THREAD!");
@@ -72,20 +68,14 @@ void ethread::PoolExecutor::start() {
 
 void ethread::PoolExecutor::stop() {
 	ETHREAD_DEBUG("STOP: thread in Pool [START]");
-	{
-		ethread::UniqueLock lock(m_mutex);
-		m_condition.notify_all();
-	}
+	m_semaphore.post();
 	m_running = false;
 	ETHREAD_DEBUG("STOP: thread in Pool [STOP]");
 }
 
 void ethread::PoolExecutor::join() {
 	ETHREAD_DEBUG("JOIN: thread in Pool [START]");
-	{
-		ethread::UniqueLock lock(m_mutex);
-		m_condition.notify_all();
-	}
+	m_semaphore.post();
 	if (m_thread != nullptr) {
 		ETHREAD_DEBUG("JOIN: waiting ...");
 		m_thread->join();
@@ -95,14 +85,13 @@ void ethread::PoolExecutor::join() {
 }
 
 bool ethread::PoolExecutor::touch() {
-	ethread::UniqueLock lock(m_mutex);
 	bool ret = false;
 	if (    m_needProcess == false
 	     && m_isWaiting == true) {
 		ETHREAD_VERBOSE("Touch ...");
 		m_needProcess = true;
 		ret = true;
-		m_condition.notify_all();
+		m_semaphore.post();
 	}
 	return ret;
 }
diff --git a/ethread/PoolExecutor.hpp b/ethread/PoolExecutor.hpp
index fdaa6cf..95e762d 100644
--- a/ethread/PoolExecutor.hpp
+++ b/ethread/PoolExecutor.hpp
@@ -20,8 +20,7 @@ namespace ethread {
 	 */
 	class PoolExecutor {
 		private: //section to permit to optimize CPU:
-			ethread::Mutex m_mutex; //!< protection of the internal data.
-			std::condition_variable m_condition; //!< Message system to send event on an other thread.
+			ethread::Semaphore m_semaphore; //!< protection of the internal data.
 			bool m_needProcess; //!< Need to do action (no need to wait condition).
 			bool m_isWaiting; //!< The executor is waiting to some action to do.
 		private:
diff --git a/ethread/Promise.cpp b/ethread/Promise.cpp
index d2881b8..4311a3e 100644
--- a/ethread/Promise.cpp
+++ b/ethread/Promise.cpp
@@ -7,6 +7,7 @@
 #include "debug.hpp"
 #include <ethread/Future.hpp>
 #include <ethread/Promise.hpp>
+#include <ethread/tools.hpp>
 #include <echrono/Steady.hpp>
 #include <etk/typeInfo.hpp>
 ETK_DECLARE_TYPE(ethread::Promise);
diff --git a/ethread/Thread.hpp b/ethread/Thread.hpp
index fd71038..ef8a22e 100644
--- a/ethread/Thread.hpp
+++ b/ethread/Thread.hpp
@@ -32,7 +32,7 @@ namespace ethread {
 			etk::String m_name; //!< Name of the thread (do not get it on the system ==> more portable)
 			etk::Function<void()> m_function; //!< Function to call every cycle of the thead running
 		public:
-			Thread(etk::Function<void()>&& _call, const etk::String& _name);
+			Thread(etk::Function<void()>&& _call, const etk::String& _name = "");
 			~Thread();
 			void join();
 			bool detach();
diff --git a/ethread/Thread.pthread.cpp b/ethread/Thread.pthread.cpp
index 8e7ebba..39353d2 100644
--- a/ethread/Thread.pthread.cpp
+++ b/ethread/Thread.pthread.cpp
@@ -32,7 +32,7 @@ ethread::Thread::Thread(etk::Function<void()>&& _call, const etk::String& _name)
 	uint32_t iii = ethread::getId();
 	pthread_create(&m_thread, nullptr, &ethread::Thread::threadCallback, this);
 	m_uid = ethread::getThreadHumanId(uint64_t(m_thread));
-	printf("New thread: %d from %d", m_uid, iii);
+	printf("New thread: %ld from %d\n", m_uid, iii);
 }
 
 ethread::Thread::~Thread() {