As can be seen from this example, some thread have real-time priorities assigned to them and some do not.
In the output shown below, "-" means no RT priority and SCHEDULE_RR.
Even for the epics application, the _MAIN_ thread in epics application process doesn't have the RT priority.
But, other threads which are created by the _MAIN_ thread have RT priority.
> 1567 1567 - screen # screen process
> 1568 1568 - evrLab # main thread in epics application process
> 1568 1570 10 evrLab
> 1568 1572 94 evrLab
> 1568 1573 10 evrLab
====================================================================================
# export PATH=/usr/bin:$PATH
# ps -Leo pid,tid,rtprio,comm
PID TID RTPRIO COMMAND
1 1 - init
2 2 - kthreadd
3 3 1 ksoftirqd/0
5 5 - kworker/0:0H
6 6 - kworker/u16:0
7 7 99 posixcputmr/0
8 8 - kclksetdelayd
9 9 1 rcub/0
10 10 - rcu_preempt
11 11 - rcu_sched
12 12 - rcu_bh
13 13 1 rcuc/0
14 14 - kcmosdelayd
15 15 99 migration/0
16 16 99 migration/1
17 17 1 rcuc/1
18 18 1 ksoftirqd/1
19 19 99 posixcputmr/1
20 20 - kworker/1:0
21 21 - kworker/1:0H
22 22 99 migration/2
23 23 1 rcuc/2
24 24 1 ksoftirqd/2
25 25 99 posixcputmr/2
26 26 - kworker/2:0
27 27 - kworker/2:0H
28 28 99 migration/3
29 29 1 rcuc/3
30 30 1 ksoftirqd/3
31 31 99 posixcputmr/3
33 33 - kworker/3:0H
34 34 99 migration/4
35 35 1 rcuc/4
36 36 1 ksoftirqd/4
37 37 99 posixcputmr/4
38 38 - kworker/4:0
39 39 - kworker/4:0H
40 40 99 migration/5
41 41 1 rcuc/5
42 42 1 ksoftirqd/5
43 43 99 posixcputmr/5
45 45 - kworker/5:0H
46 46 99 migration/6
47 47 1 rcuc/6
48 48 1 ksoftirqd/6
49 49 99 posixcputmr/6
51 51 - kworker/6:0H
52 52 99 migration/7
53 53 1 rcuc/7
54 54 1 ksoftirqd/7
55 55 99 posixcputmr/7
56 56 - kworker/7:0
57 57 - kworker/7:0H
58 58 - khelper
59 59 - kdevtmpfs
60 60 - netns
61 61 - kworker/u16:1
306 306 - writeback
308 308 - ksmd
309 309 - kintegrityd
310 310 - bioset
311 311 - crypto
313 313 - kblockd
314 314 50 irq/9-acpi
555 555 - kworker/0:1
572 572 - khubd
689 689 - rpciod
709 709 - khungtaskd
736 736 - kswapd0
806 806 - fsnotify_mark
821 821 - nfsiod
845 845 50 irq/104-PCIe PM
846 846 50 irq/105-PCIe PM
847 847 50 irq/106-PCIe PM
848 848 50 irq/107-PCIe PM
849 849 50 irq/108-PCIe PM
850 850 50 irq/109-PCIe PM
851 851 50 irq/110-PCIe PM
852 852 50 irq/111-PCIe PM
853 853 50 irq/112-PCIe PM
1010 1010 - cnic_wq
1011 1011 - bnx2x
1105 1105 - cxgb4
1133 1133 50 irq/23-ehci_hcd
1137 1137 50 irq/22-ehci_hcd
1154 1154 - kworker/6:1
1161 1161 50 irq/8-rtc0
1176 1176 - mce-notify
1180 1180 - deferwq
1182 1182 50 irq/4-serial
1205 1205 - syslogd
1208 1208 - klogd
1245 1245 50 irq/113-eth0-tx
1246 1246 50 irq/114-eth0-rx
1247 1247 50 irq/115-eth0-rx
1248 1248 50 irq/116-eth0-rx
1249 1249 50 irq/117-eth0-rx
1273 1273 - udhcpc
1280 1280 - telnetd
1283 1283 - ntpd
1286 1286 - dropbear
1287 1287 - exe
1288 1288 - getty
1323 1323 - sh
1324 1324 - caRepeater
1419 1419 - dropbear
1420 1420 - sh
1433 1433 - kworker/5:2
1445 1445 - kworker/3:2
1503 1503 - kworker/0:2
1505 1505 - kworker/3:0
1513 1513 - kworker/5:0
1528 1528 - kworker/7:2
1547 1547 - kworker/4:1
1559 1559 - kworker/2:2
1562 1562 - kworker/6:2
1563 1563 - kworker/1:1
1567 1567 - screen
1568 1568 - evrLab
1568 1570 10 evrLab
1568 1572 94 evrLab
1568 1573 10 evrLab
1568 1574 69 evrLab
1568 1575 58 evrLab
1568 1576 63 evrLab
1568 1577 70 evrLab
1568 1578 50 evrLab
1568 1579 90 evrLab
1568 1580 89 evrLab
1568 1581 79 evrLab
1568 1582 59 evrLab
1568 1583 69 evrLab
1568 1584 59 evrLab
1568 1585 60 evrLab
1568 1586 61 evrLab
1568 1587 62 evrLab
1568 1588 63 evrLab
1568 1589 64 evrLab
1568 1590 65 evrLab
1568 1591 56 evrLab
1568 1592 16 evrLab
1568 1593 14 evrLab
1568 1594 12 evrLab
1568 1595 10 evrLab
1568 1596 51 evrLab
1568 1597 10 evrLab
1568 1598 53 evrLab
1568 1599 51 evrLab
1568 1600 10 evrLab
1568 1601 20 evrLab
1568 1605 48 evrLab
1568 1606 51 evrLab
1568 1612 22 evrLab
1571 1571 95 irq/48-mrfevr30
1614 1614 - screen
1615 1615 - dropbear
1616 1616 - sh
1622 1622 - sh
1627 1627 - kworker/3:1
1628 1628 - ps
===============================================================
