[REG: 5->6] pthread functions seem to refer to the parent process in QProcess child setup

$ strace -e sched_setaffinity,sched_setscheduler -f ./qtbug*
(parent) pthread_id: 140076353583104
(parent) pid: 338620
strace: Process 338621 attached
(child) pthread_id: 140076353583104
(child) pid: 338621
pid: 338621 set_affinity 2 - 3
[pid 338621] sched_setaffinity(338620, 128, [2, 3]) = 0
[pid 338621] sched_setscheduler(338620, SCHED_FIFO, [40]) = -1 EPERM (Operation not permitted)
strace: Process 338622 attached
pid 338621's current affinity list: 0-7
[pid 338622] +++ exited with 0 +++
[pid 338621] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=338622, si_uid=1000, si_status=0, si_utime=0, si_stime=0} ---
    TID     PID    PPID PSR CLS PRI RTPRIO
 338621  338621  338620   4 TS   19      -
[pid 338621] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=338621, si_uid=1000, si_status=0, si_utime=0, si_stime=3} ---
+++ exited with 0 +++