Alexandre Julliard (@julliard) commented about server/thread.c:
+static void apply_thread_priority( struct thread *thread, int priority_class, int priority ) +{ + int base_priority = get_base_priority( priority_class, priority ); +#ifdef __linux__ + int niceness; + + if (thread->unix_tid == -1) return; + + /* FIXME: handle REALTIME class using SCHED_RR if possible, for now map it to highest non-realtime band */ + if (priority_class == PROCESS_PRIOCLASS_REALTIME) base_priority = 15; +#ifdef HAVE_SETPRIORITY + if (nice_limit < 0) + { + niceness = get_unix_niceness( base_priority ); + if (setpriority( PRIO_PROCESS, thread->unix_tid, niceness ) != 0) + fprintf( stderr, "wine: setpriority %d for pid %d failed: %d\n", niceness, thread->unix_tid, errno ); Errors should be handled and propagated to the caller, not printed on the console.
-- https://gitlab.winehq.org/wine/wine/-/merge_requests/4551#note_59327