-// *** GLOBALS *****************************************************************
-
-// All queues are locked through one global mutex.
-static pthread_mutex_t shared_queue_mutex = PTHREAD_MUTEX_INITIALIZER;
-
-// When a writer runs out of work to do, it sleeps on this global cond.
-static pthread_cond_t shared_wakeup_cond = PTHREAD_COND_INITIALIZER;
-