HEY!

/*
 * Copyright 2017 Wade Lawrence Hennessey
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

very useful to keep debuginfo up to date
dnf --enablerepo=updates-debuginfo update

m-x gud-gdb to switch *dedicated* window
c-x c-a c-b to set breakpoint at point line. Who changed this and why?

service sshd start
// to enable sshd at boot time
systemctl enable sshd.service


git clone https://github.com/wadehennessey/rtgc.git
or
git checkout <commit hash> 


git commit -am "blah"
# then must push commit
git push



use #define _GNU_SOURCE for weird compile problems not seeing decls


gdb> info signals
use next instead of continue to switch to diff thread break points

# these go in .gdbinit
handle SIGUSR1 nostop
set non-stop on

>set non-stop on
>set non-stop off
>show non-stop
>interrupt     will stop the running thread
>break a.c:166 if (j == 1535)


wmctrl -r "emacs" -e 1,-1,-1,770,1010



TODO:
-----
verify:
double linked lists correct - (obj->next)->prev == obj, (obj->prev)->next == obj
verify color in header and color in list are the same
verify all _count fields are correct.

# to limit all threads in ./a to the second core:
taskset 0x10 ./a

# rr traces are stored in /home/wade/.local/share/rr/

gdb tui mode in xterm: c-x a

too see event numbers and start at a specific event number:
rr -M replay -g <event-number>

rr dump
rr dump /home/wade/.local/share/rr/a-0/ 39000000

try gdb cmds:
-------------
checkpoint
info checkpoints
restart <cp-id>
delete <cp-id>
watch -l <location>
when - command shows current event-number

try rr -c and -e options to increase thread interleave

# task switch after every N retired branches
rr record -c 2500 ./a

# I think I recorded "the bug" with this (compile "make debug")
rr record -c 5 ./a

# to see record options
rr help record
rr help replay

From rr/src/Scheduler.h
-c default:  enum { DEFAULT_MAX_TICKS = 250000 };    // 50ms time slice
-e default:  enum { DEFAULT_MAX_EVENTS = 10 };

To run real-time round-robin:
-----------------
chrt --rr 30 ./a
or
chrt --fifo 30 ./a

ps -Lo pid,tid,class <./a pid #>


To add swap
------------
su
cd /home
dd if=/dev/zero of=bigswapfile bs=1G count=64
chmod 600 /root/bigswapfile
mkswap bigswapfile
swapon bigswapfile

in /etc/fstab add:
/home/bigswapfile		swap		swap	defaults	0 0


flip
-------
200ns for the "null" signal and return time. Includes double the "system" time.
Mean 5000 "null" signal and returns per 1ms.

Time for 1,000,000 "null" kill signal and returns 
real	0m0.209s
user	0m0.029s
sys	0m0.389s

---------------------------------------------

try gcc -mcmodel=large to avoid dlopen relocation problems in wcl

change wcl print level to once for lib, once for compiler. Make it easy to change back.

Add IF_COUNTING/DEBUG wrappers

switch *debug-library-config* to *delivery-library-config* when doing build
to speed things up
--------------

add .gdbinit to rtgc, make ~/.gdbinit a link to rtgc version
add .wclinit to wcl, make ~/.wclinit a link



--------------------------------
clang stuff

run "clang -### -c a.c" to see full command line the driver generates, 
then append "-ast-dump" to the end and run it.

in build dir "make clang" will just rebuild clang


AST Matcher
-------------
NOTE: clang-query only reads file passed to it *ONCE* at startup. File changes
after file is read are *NOT* seen.

/home/wade/build/bin/clang-query /tmp/w.c --
> set output diag

----------
export C_INCLUDE_PATH=/home/wade/build/lib/clang/4.0.0/include

-----------
Try LIBRARY_PATH env variable to allow removal or librtgc.so from wcl tree