Clarify DFLT and PRIO "wait_operation" field in rtems_monitor_task_dump() in pthreads in 4.12

[Peter Dufault]

I’m moving an older application to 4.12 and having performance issues compared to “4.11” (aka “4.10.99”) from around 2012.

I have pthreads that are showing up as DFLT and PRIO in the “pthread” command in the shell.  For example, here:

---
[/] # pthread
ID         NAME       CPU PRI STATE  MODES    EVENTS WAITID   WAITQUEUE
------------------------------------------------------------------------------
0b010001                0 253 SUSP   P:T:nA   NONE   00000000 00000000 [DFLT]
0b010002   grid         0 128 Wsem   P:T:nA   NONE   1a010006 00262a78 [PRIO]
0b010003   sokmon       0  55 Wsysev P:T:nA   NONE   00000000 00000000 [DFLT]
0b010004   sokmon       0 129 Wsysev P:T:nA   NONE   00000000 00000000 [DFLT]
0b010005   tmsync       0 129 DELAY:Wisig P:T:nA   NONE   00000000 00236260 [FIFO]
0b010006   log          0 129 Wsem   P:T:nA   NONE   3b010001 00275588 [FIFO]
0b010007   fset         0 129 Wsem   P:T:nA   NONE   3b01001e 00275a10 [FIFO]
0b010008   frm          0  25 Wsem   P:T:nA   NONE   3b010003 002755d8 [FIFO]
0b010009   publsh       0 128 Wjatx  P:T:nA   NONE   00000000 00000000 [DFLT]
0b01000a   frm          0  25 Wsem   P:T:nA   NONE   3b010007 00275678 [FIFO]
0b01000b   publsh       0 128 Wjatx  P:T:nA   NONE   00000000 00000000 [DFLT]
0b01000c   ss_srv       0 128 Wsysev P:T:nA   NONE   00000000 00000000 [DFLT]
0b01000d   muxmon       0 128 Wsem   P:T:nA   NONE   1a010016 00262ef8 [PRIO]
0b01000e   commute      0   1 Wsem   P:T:nA   NONE   3b01000b 00275718 [FIFO]
0b01000f   servo        0  17 Wsem   P:T:nA   NONE   3b010013 00275858 [FIFO]
0b010011   tclsrv       0  55 Wsysev P:T:nA   NONE   00000000 00000000 [DFLT]
[/] # 
---
I started everything all pthreads with the SCHED_FIFO policy (I have a single wrapper around pthread_create() that I use), and I’m guessing this field has nothing to do with that.  Some are now DFLT and PRIO.

I note that both WAITID and WAITQUEUE are always 0 in the DFLT case.

- Does PRIO mean the priority is boosted?  I don’t expect that, especially for the “muxmon” or “sokmon” threads.
- What does DFLT mean?

Peter
-----------------
Peter Dufault
HD Associates, Inc.      Software and System Engineering

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