-void TRACE_msg_set_task_category(msg_task_t task, const char *category);
-void TRACE_msg_task_create(msg_task_t task);
-void TRACE_msg_task_execute_start(msg_task_t task);
-void TRACE_msg_task_execute_end(msg_task_t task);
-void TRACE_msg_task_destroy(msg_task_t task);
-void TRACE_msg_task_get_start(void);
-void TRACE_msg_task_get_end(double start_time, msg_task_t task);
-int TRACE_msg_task_put_start(msg_task_t task); //returns TRUE if the task_put_end must be called
-void TRACE_msg_task_put_end(void);
+XBT_PRIVATE void TRACE_msg_set_task_category(msg_task_t task, const char *category);
+XBT_PRIVATE void TRACE_msg_task_create(msg_task_t task);
+XBT_PRIVATE void TRACE_msg_task_execute_start(msg_task_t task);
+XBT_PRIVATE void TRACE_msg_task_execute_end(msg_task_t task);
+XBT_PRIVATE void TRACE_msg_task_destroy(msg_task_t task);
+XBT_PRIVATE void TRACE_msg_task_get_end(double start_time, msg_task_t task);
+XBT_PRIVATE void TRACE_msg_task_get_start(void);
+XBT_PRIVATE int TRACE_msg_task_put_start(msg_task_t task); //returns TRUE if the task_put_end must be called
+XBT_PRIVATE void TRACE_msg_task_put_end(void);