diff --git a/lib/include/chiaki/thread.h b/lib/include/chiaki/thread.h
index dfd082f..d2a104e 100644
--- a/lib/include/chiaki/thread.h
+++ b/lib/include/chiaki/thread.h
@@ -48,6 +48,19 @@ CHIAKI_EXPORT ChiakiErrorCode chiaki_mutex_lock(ChiakiMutex *mutex);
 CHIAKI_EXPORT ChiakiErrorCode chiaki_mutex_trylock(ChiakiMutex *mutex);
 CHIAKI_EXPORT ChiakiErrorCode chiaki_mutex_unlock(ChiakiMutex *mutex);
 
+
+typedef struct chiaki_cond_t
+{
+	pthread_cond_t cond;
+} ChiakiCond;
+
+CHIAKI_EXPORT ChiakiErrorCode chiaki_cond_init(ChiakiCond *cond);
+CHIAKI_EXPORT ChiakiErrorCode chiaki_cond_fini(ChiakiCond *cond);
+CHIAKI_EXPORT ChiakiErrorCode chiaki_cond_wait(ChiakiCond *cond, ChiakiMutex *mutex);
+CHIAKI_EXPORT ChiakiErrorCode chiaki_cond_signal(ChiakiCond *cond);
+CHIAKI_EXPORT ChiakiErrorCode chiaki_cond_broadcast(ChiakiCond *cond);
+
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/src/thread.c b/lib/src/thread.c
index 500f8a3..c066738 100644
--- a/lib/src/thread.c
+++ b/lib/src/thread.c
@@ -79,4 +79,49 @@ CHIAKI_EXPORT ChiakiErrorCode chiaki_mutex_unlock(ChiakiMutex *mutex)
 	if(r != 0)
 		return CHIAKI_ERR_UNKNOWN;
 	return CHIAKI_ERR_SUCCESS;
-}
\ No newline at end of file
+}
+
+
+
+
+CHIAKI_EXPORT ChiakiErrorCode chiaki_cond_init(ChiakiCond *cond)
+{
+	int r = pthread_cond_init(&cond->cond, NULL);
+	if(r != 0)
+		return CHIAKI_ERR_UNKNOWN;
+	return CHIAKI_ERR_SUCCESS;
+}
+
+CHIAKI_EXPORT ChiakiErrorCode chiaki_cond_fini(ChiakiCond *cond)
+{
+	int r = pthread_cond_destroy(&cond->cond);
+	if(r != 0)
+		return CHIAKI_ERR_UNKNOWN;
+	return CHIAKI_ERR_SUCCESS;
+}
+
+
+
+CHIAKI_EXPORT ChiakiErrorCode chiaki_cond_wait(ChiakiCond *cond, ChiakiMutex *mutex)
+{
+	int r = pthread_cond_wait(&cond->cond, &mutex->mutex);
+	if(r != 0)
+		return CHIAKI_ERR_UNKNOWN;
+	return CHIAKI_ERR_SUCCESS;
+}
+
+CHIAKI_EXPORT ChiakiErrorCode chiaki_cond_signal(ChiakiCond *cond)
+{
+	int r = pthread_cond_signal(&cond->cond);
+	if(r != 0)
+		return CHIAKI_ERR_UNKNOWN;
+	return CHIAKI_ERR_SUCCESS;
+}
+
+CHIAKI_EXPORT ChiakiErrorCode chiaki_cond_broadcast(ChiakiCond *cond)
+{
+	int r = pthread_cond_broadcast(&cond->cond);
+	if(r != 0)
+		return CHIAKI_ERR_UNKNOWN;
+	return CHIAKI_ERR_SUCCESS;
+}