diff --git a/src/thread/pithread.cpp b/src/thread/pithread.cpp
index a5debcda..44a5eaa4 100755
--- a/src/thread/pithread.cpp
+++ b/src/thread/pithread.cpp
@@ -127,7 +127,7 @@ bool PIThread::start(int timer_delay) {
 #  endif
 	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	int ret = pthread_create(&thread, &attr, thread_function, this);
-	piCout << "pthread_create" << thread;
+	//piCout << "pthread_create" << thread;
 	pthread_attr_destroy(&attr);
 	if (ret == 0) {
 #else
@@ -158,7 +158,7 @@ bool PIThread::startOnce() {
 #  endif
 	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	int ret = pthread_create(&thread, &attr, thread_function_once, this);
-	piCout << "pthread_create" << thread;
+	//piCout << "pthread_create" << thread;
 	pthread_attr_destroy(&attr);
 	if (ret == 0) {
 #else
@@ -181,7 +181,7 @@ bool PIThread::startOnce() {
 void PIThread::terminate() {
 	if (thread == 0) return;
 	terminating = running_ = false;
-	piCout << "terminate" << thread;
+	//piCout << "terminate" << thread;
 #ifndef WINDOWS
 #  ifdef ANDROID
 	pthread_kill(thread, SIGTERM);
@@ -239,7 +239,7 @@ __THREAD_FUNC__ PIThread::thread_function(void * t) {
 	if (ct.lockRun) ct.mutex_.unlock();
 	ct.terminating = ct.running_ = false;
 	//cout << "thread " << t << " exiting ... " << endl;
-	piCout << "pthread_exit" << ct.thread;
+	//piCout << "pthread_exit" << ct.thread;
 #ifndef WINDOWS
 	pthread_detach(ct.thread);
 	ct.thread = 0;
@@ -275,7 +275,7 @@ __THREAD_FUNC__ PIThread::thread_function_once(void * t) {
 	ct.end();
 	ct.terminating = ct.running_ = false;
 	//cout << "thread " << t << " exiting ... " << endl;
-	piCout << "pthread_exit" << ct.thread;
+	//piCout << "pthread_exit" << ct.thread;
 #ifndef WINDOWS
 	pthread_detach(ct.thread);
 	ct.thread = 0;
@@ -322,8 +322,8 @@ int PIThread::priority2System(PIThread::Priority p) {
 void PIThread::setPriority(PIThread::Priority prior) {
 	priority_ = prior;
 #ifndef WINDOWS
-	if (!running_ && (thread != 0)) return;
-	piCout << "setPriority" << thread;
+	if (!running_ || (thread == 0)) return;
+	//piCout << "setPriority" << thread;
 	policy_ = 0;
 	memset(&sparam, 0, sizeof(sparam));
 	pthread_getschedparam(thread, &policy_, &sparam);
@@ -336,7 +336,7 @@ void PIThread::setPriority(PIThread::Priority prior) {
 							= priority2System(priority_);
 	pthread_setschedparam(thread, policy_, &sparam);
 #else
-	if (!running_ && (thread != 0)) return;
+	if (!running_ || (thread == 0)) return;
 	SetThreadPriority(thread, priority2System(priority_));
 #endif
 }