diff --git a/libs/main/thread/piconditionvar.cpp b/libs/main/thread/piconditionvar.cpp
index 9ad6538b..9480bb79 100644
--- a/libs/main/thread/piconditionvar.cpp
+++ b/libs/main/thread/piconditionvar.cpp
@@ -35,7 +35,6 @@ PRIVATE_DEFINITION_START(PIConditionVariable)
 	CONDITION_VARIABLE nativeHandle;
 #else
 	pthread_cond_t nativeHandle;
-	PIMutex * currentLock;
 #endif
 	bool isDestroying;
 PRIVATE_DEFINITION_END(PIConditionVariable)
@@ -46,9 +45,12 @@ PIConditionVariable::PIConditionVariable() {
 	InitializeConditionVariable(&PRIVATE->nativeHandle);
 #else
 	PRIVATE->isDestroying = false;
-	PRIVATE->currentLock = nullptr;
-	memset(&(PRIVATE->nativeHandle), 0, sizeof(PRIVATE->nativeHandle));
-	pthread_cond_init(&PRIVATE->nativeHandle, NULL);
+
+    pthread_condattr_t condattr;
+    pthread_condattr_init(&condattr);
+    pthread_condattr_setclock(&condattr, CLOCK_MONOTONIC);
+    memset(&(PRIVATE->nativeHandle), 0, sizeof(PRIVATE->nativeHandle));
+	pthread_cond_init(&PRIVATE->nativeHandle, &condattr);
 #endif
 }
 
@@ -84,23 +86,38 @@ void PIConditionVariable::wait(PIMutex& lk, const std::function<bool()>& conditi
 	}
 }
 
+void timespec_add_ms(timespec* ts, int ms) {
+    ts->tv_sec += ms / 1000;
+    ts->tv_nsec += ms % 1000 * 1000000;
+    if (ts->tv_nsec > 1000 * 1000 * 1000) {
+        ts->tv_sec++;
+        ts->tv_nsec -= 1000 * 1000 * 1000;
+    }
+}
 
 bool PIConditionVariable::waitFor(PIMutex &lk, int timeoutMs) {
 	bool isNotTimeout;
 #ifdef WINDOWS
 	isNotTimeout = SleepConditionVariableCS(&PRIVATE->nativeHandle, (PCRITICAL_SECTION)lk.handle(), timeoutMs) != 0;
 #else
-	timespec abstime = {.tv_sec = timeoutMs / 1000, .tv_nsec = timeoutMs % 1000 * 1000000};
-	isNotTimeout = pthread_cond_timedwait(&PRIVATE->nativeHandle, (pthread_mutex_t*)lk.handle(), &abstime) == 0;
+    timespec expire_ts;
+    clock_gettime(CLOCK_MONOTONIC, &expire_ts);
+    timespec_add_ms(&expire_ts, timeoutMs);
+	isNotTimeout = pthread_cond_timedwait(&PRIVATE->nativeHandle, (pthread_mutex_t*)lk.handle(), &expire_ts) == 0;
 #endif
 	if (PRIVATE->isDestroying) return false;
 	return isNotTimeout;
 }
 
-
 bool PIConditionVariable::waitFor(PIMutex& lk, int timeoutMs, const std::function<bool()> &condition) {
 	bool isCondition;
+#ifdef WINDOWS
 	PITimeMeasurer measurer;
+#else
+	timespec expire_ts;
+	clock_gettime(CLOCK_MONOTONIC, &expire_ts);
+    timespec_add_ms(&expire_ts, timeoutMs);
+#endif
 	while (true) {
 		isCondition = condition();
 		if (isCondition) break;
@@ -110,9 +127,7 @@ bool PIConditionVariable::waitFor(PIMutex& lk, int timeoutMs, const std::functio
 					(PCRITICAL_SECTION)lk.handle(),
 					timeoutMs - (int)measurer.elapsed_m()) == 0;
 #else
-		int timeoutCurr = timeoutMs - (int)measurer.elapsed_m();
-		timespec abstime = {.tv_sec = timeoutCurr / 1000, .tv_nsec = timeoutCurr % 1000 * 1000000};
-		bool isTimeout = pthread_cond_timedwait(&PRIVATE->nativeHandle, (pthread_mutex_t*)lk.handle(), &abstime) != 0;
+		bool isTimeout = pthread_cond_timedwait(&PRIVATE->nativeHandle, (pthread_mutex_t*)lk.handle(), &expire_ts) != 0;
 #endif
 		if (isTimeout) return false;
 		if (PRIVATE->isDestroying) return false;
diff --git a/tests/concurrent/BlockingDequeueUnitTest.cpp b/tests/concurrent/BlockingDequeueUnitTest.cpp
index 993326dd..8c9c8818 100644
--- a/tests/concurrent/BlockingDequeueUnitTest.cpp
+++ b/tests/concurrent/BlockingDequeueUnitTest.cpp
@@ -14,9 +14,7 @@ public:
 
 	void wait(PIMutex& lk, const std::function<bool()>& condition) override {
         isWaitCalled = true;
-        lk.lock();
         isTrueCondition = condition();
-        lk.unlock();
     }
 
 	bool waitFor(PIMutex& lk, int timeoutMs) override {
@@ -27,10 +25,8 @@ public:
 
 	bool waitFor(PIMutex& lk, int timeoutMs, const std::function<bool()>& condition) override {
         isWaitForCalled = true;
-        lk.lock();
         isTrueCondition = condition();
         timeout = timeoutMs;
-        lk.unlock();
         return isTrueCondition;
     }
 };