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  1641   06 Aug 2019 Thomas LindnerForumMIDAS Workshop on Aug 7
Dear MIDAS users,

A final reminder about the MIDAS workshop tomorrow.  A couple reminders/notes: 

1) Workshop will take place from 1PM-5:30PM (Vancouver time) on Aug 7.

2) A finalized agenda for the workshop is posted here:

https://indico.triumf.ca/conferenceDisplay.py?confId=2438

Speakers should email me their talks beforehand and I will post them.

3) For those who want to participate remotely, we will be using bluejeans.  The webpage for the bluejeans meeting is here:
 
https://bluejeans.com/462865444

I will start the connection ~20min before the start of the session; people calling in remotely might want to call early, so we can test the sound quality.

4) For those at TRIUMF, the meeting will be in the ISAC-II conference room.

Thomas
 

> Dear MIDAS users,
> 
> Here's further information on the third MIDAS workshop:
> 
> 1) Workshop will take place from 1PM-5PM (Vancouver time) on Aug 7.
> 
> 2) A mostly finalized agenda for the workshop is posted here:
> 
> https://indico.triumf.ca/conferenceDisplay.py?confId=2438
> 
> People are still welcome to email me if they want to present something.  We should be able to add it to the schedule.
> 
> 3) For those who want to participate remotely, we will be using bluejeans.  The webpage for the bluejeans meeting is here:
> 
> https://bluejeans.com/462865444
> 
> 4) For those at TRIUMF I will confirm the meeting room closer to the date.
> 
> Thomas
> 
> 
> > Dear MIDAS users,
> > 
> > We would like to announce a third MIDAS workshop at TRIUMF on Aug 7, 2019.
> > Stefan Ritt will again be visiting TRIUMF at this time.
> > 
> > The overall goal of the workshop is to present new features in MIDAS, to discuss
> > future changes and to hear experiences from different experiments.
> > 
> > We expect that some participants will connect remotely to the workshop; we will
> > setup a video-conferencing option.  The exact time of the workshop will be
> > decided later and will be optimized based on the geographic distribution of
> > remote attendees. So please let us know if you want to attend remotely.  We are
> > also happy for people to come in person to TRIUMF.  
> > 
> > A (very) preliminary agenda includes
> > 
> > - New default mhttpd pages and new APIs for custom pages
> > - Conversion of MIDAS to C++
> > - new C++ based frontend framework (tmfe and mvodb from ALPHA-g)
> > - MySQL/Postgres database for storing ODB configurations
> > - Plans for updating history plotting
> > - Using MIDAS with an online trigger farm
> > - new C++ multithreaded flow analyzer (manalyzer from ALPHA-g)
> > 
> > But please suggest other topics; we also hope to hear reports from particular
> > experiments.
> > 
> > Sincerely,
> > Thomas (on behalf of MIDAS developers)
  1640   05 Aug 2019 Stefan RittInfoPrecedence of equipment/common structure
Today I fixed a long-annoying problem. We have in each front-end an equipment structure 
which defined the event id, event type, readout frequency etc. This is mapped to the ODB 
subtree

/Equipment/<name>/Common

In the past, the ODB setting took precedence over the frontend structure. We defined this 
like 25 years ago and I forgot what the exact reason was. It causes however many people 
(including myself) to fall into this trap: You change something in the front-end EQUIPMENT 
structure, you restart the front-end, but the new setting does not take effect since the 
(old) ODB value took precedence. After some debugging you find out that you have to both 
change the EQUIPMENT structure (which defines the default value for a fresh ODB) and the 
ODB value itself.

So I changed it in the current develop tree that the front-end structure takes precedence. 
You still have a hot-link, so if you want to change anything while the front-end is running 
(like the readout period), you can do that in the ODB and it takes effect immediately. But 
when you start the front-end the next time, the value from the EQUIPMENT structure is 
taken again. So please be aware of this new feature.

Happy BC day,
Stefan
  1639   01 Aug 2019 Stefan RittForumHow to convert C midas frontends to C++ (my problem solved)
> 
> Ok, so the detail that I missed was that the dummy functions
> 
> INT poll_event(INT source[], INT count, BOOL test)
> {
>    return 1;
> };
> 
> as shown in some of the older examples, work when you set
> 
> INT poll_event(INT source, INT count, BOOL test)
> {
>    return 1;
> };

If you would have read elog:1526 more carefully (point a4) you would have saved yourself a lot of time.

Stefan
  1638   30 Jul 2019 Stefan RittInfoLimitations of MSL
> Would it be possible to add something like the following?
>  343 if (!isdigit(value1_var[i]) && value1_var[i] != '.')
>  344          break;

Actually isdigit() is completely wrong here, because it also fails the minus sign and the 'E' exponent, like in -1.2E-3 

So I changed it to strchr("0123456789.+-Ee", var[i]) which should cover this case. If you put 1.2.3, it takes it as 1.2. 

Stefan
  1637   30 Jul 2019 Stefan RittForumHow to convert C midas frontends to C++ (my problem solved)
> as a side comment, not all drivers are c++ compatible yet (e.g. mscbvr), so changes needed are small 

Right. We recently switched the whole midas to c++, but we could not cover all drivers. Most of them just need some type 
casting to compile under c++. I got already patches from several people which I'm happy to merge in. If you got mscbhvr 
or any other driver compile under c++, please send me the diff.

Stefan
  1636   26 Jul 2019 HassanBug ReportFetest History Plot
Hi, our logger was running. I have tried restarting mlogger (even though we haven't
changed variable names). We ran the following commands one after another and still no
luck with history plot. Is there anything else that could be causing these problems?

Kind regards,
Hassan 

==================================================================================

[lm17773@it038146 ~]$ cd /opt/midas_software/midas/bin/
[lm17773@it038146 bin]$ mhttpd
[mhttpd,ERROR] [odb.cxx:1646:db_open_database,ERROR] Removed ODB client 'mhttpd',
index 0 because process pid 20094 does not exists
[mhttpd,ERROR] [odb.cxx:1646:db_open_database,ERROR] Removed ODB client 'Logger',
index 1 because process pid 20214 does not exists
[mhttpd,INFO] Removed open record flag from "/Experiment/Security/RPC hosts/Allowed hosts"
[mhttpd,INFO] Removed exclusive access mode from "/Experiment/Security/RPC
hosts/Allowed hosts"
[mhttpd,INFO] Removed open record flag from "/Experiment/Security/mhttpd hosts/Allowed
hosts"
[mhttpd,INFO] Removed exclusive access mode from "/Experiment/Security/mhttpd
hosts/Allowed hosts"
[mhttpd,INFO] Removed open record flag from "/Logger/History"
[mhttpd,INFO] Removed exclusive access mode from "/Logger/History"
[mhttpd,INFO] Removed open record flag from "/Sequencer/State"
[mhttpd,INFO] Removed exclusive access mode from "/Sequencer/State"
[mhttpd,INFO] Removed open record flag from "/History/LoggerHistoryChannel"
[mhttpd,INFO] Removed exclusive access mode from "/History/LoggerHistoryChannel"
[mhttpd,INFO] Removed open record flag from "/Equipment/slow/Variables"
[mhttpd,INFO] Removed exclusive access mode from "/Equipment/slow/Variables"
[mhttpd,INFO] Removed open record flag from "/Equipment/Trigger/Statistics/Events per
sec."
[mhttpd,INFO] Removed exclusive access mode from "/Equipment/Trigger/Statistics/Events
per sec."
[mhttpd,INFO] Removed open record flag from "/Equipment/Trigger/Statistics/kBytes per
sec."
[mhttpd,INFO] Removed exclusive access mode from "/Equipment/Trigger/Statistics/kBytes
per sec."
[mhttpd,INFO] Removed open record flag from "/Equipment/Periodic/Variables"
[mhttpd,INFO] Removed exclusive access mode from "/Equipment/Periodic/Variables"
[mhttpd,INFO] Removed open record flag from "/Equipment/Scaler/Variables"
[mhttpd,INFO] Removed exclusive access mode from "/Equipment/Scaler/Variables"
[mhttpd,INFO] Corrected 10 ODB entries
[mhttpd,INFO] Deleted entry '/System/Clients/20094' for client 'mhttpd' because it is
not connected to ODB
Mongoose web server will use SSL certificate file "/home/lm17773/online/ssl_cert.pem"
Mongoose web server will use authentication realm "sampleexpt", password file
"/home/lm17773/online/htpasswd.txt"
mongoose web server is redirecting HTTP port 8080 to
https://it038146.users.bris.ac.uk:8443
mongoose web server is listening on the HTTP port 8080
mongoose web server is listening on the HTTPS port 8443
====================================================================================

[lm17773@it038146 bin]$ mlogger
[Logger,INFO] Deleted entry '/System/Clients/20214' for client 'Logger' because it is
not connected to ODB
Log     directory is /home/lm17773/online/
Data    directory is same as Log unless specified in /Logger/channels/
History directory is same as Log unless specified in /Logger/history/
ELog    directory is same as Log
SQL     database is localhost/sampleexpt/Runlog
MIDAS logger started. Stop with "!"
====================================================================================
[lm17773@it038146 bin]$ fetest
Frontend name          :     fetest
Event buffer size      :     10485760
User max event size    :     4194304
User max frag. size    :     4194304
# of events per buffer :     2

Connect to experiment sampleexpt...
OK
Init hardware...frontend_init!
Event size set to 10240 bytes
Ring buffer wait sleep 1 ms
OK
time 1564131394, data 97.814758
time 1564131395, data 96.592583
time 1564131396, data 95.105652
time 1564131397, data 93.358040
time 1564131398, data 91.354546
time 1564131399, data 89.100655
time 1564131400, data 86.602539
time 1564131401, data 83.867058
time 1564131402, data 80.901703
time 1564131403, data 77.714592
Warning: bank RND4 has zero size
time 1564131404, data 74.314484
time 1564131405, data 70.710678
time 1564131406, data 66.913063
time 1564131407, data 62.932041
====================================================================================






> > Hi,
> > 
> > We've been trying to run Fetest in the attempt of plotting the sine wave data on
> > the history page on the web server. However each time we've tried running a new
> > plot we have come across the error of 'no data' from the variables. In the
> > status page we are clearly obtaining data from the frontend and it is updating
> > the variable as expected in SLOW.
> > 
> > When setting up MIDAS we managed to produce a history plot from Fetest but are
> > unable to do so any longer. We did have a go at modifying the Fetest code but
> > created a backup before doing so and are now running the original backup.
> > 
> > What could be causing the Fetest data not to be showing in the history plot?
> 
> Is the logger running? (this application is handling the history data).
> If yes: Did you change the variable names? If yes: restart the logger.
  Draft   26 Jul 2019 HassanBug ReportFetest History Plot
===================================================================================
[lm17773@it038146 ~]$ cd /opt/midas_software/midas/bin/
[lm17773@it038146 bin]$ fetest
Frontend name          :     fetest
Event buffer size      :     10485760
User max event size    :     4194304
User max frag. size    :     4194304
# of events per buffer :     2

Connect to experiment sampleexpt...
[fetest,ERROR] [odb.cxx:1646:db_open_database,ERROR] Removed ODB client 'Logger', index 1 because process pid 22659 does not exists
[fetest,ERROR] [odb.cxx:1646:db_open_database,ERROR] Removed ODB client 'mhttpd', index 2 because process pid 20257 does not exists
[fetest,INFO] Removed open record flag from "/Experiment/Security/RPC hosts/Allowed hosts"
[fetest,INFO] Removed exclusive access mode from "/Experiment/Security/RPC hosts/Allowed hosts"
[fetest,INFO] Removed open record flag from "/Experiment/Security/mhttpd hosts/Allowed hosts"
[fetest,INFO] Removed exclusive access mode from "/Experiment/Security/mhttpd hosts/Allowed hosts"
[fetest,INFO] Removed open record flag from "/Logger/Channels/0/Settings"
[fetest,INFO] Removed exclusive access mode from "/Logger/Channels/0/Settings"
[fetest,INFO] Removed open record flag from "/Logger/Channels/0/Statistics"
[fetest,INFO] Removed exclusive access mode from "/Logger/Channels/0/Statistics"
[fetest,INFO] Removed open record flag from "/Logger/History"
[fetest,INFO] Removed exclusive access mode from "/Logger/History"
[fetest,INFO] Removed open record flag from "/Sequencer/State"
[fetest,INFO] Removed exclusive access mode from "/Sequencer/State"
[fetest,INFO] Removed open record flag from "/History/LoggerHistoryChannel"
[fetest,INFO] Removed exclusive access mode from "/History/LoggerHistoryChannel"
[fetest,INFO] Removed open record flag from "/Equipment/slow/Variables"
[fetest,INFO] Removed exclusive access mode from "/Equipment/slow/Variables"
[fetest,INFO] Removed open record flag from "/Equipment/Trigger/Statistics/Events per sec."
[fetest,INFO] Removed exclusive access mode from "/Equipment/Trigger/Statistics/Events per sec."
[fetest,INFO] Removed open record flag from "/Equipment/Trigger/Statistics/kBytes per sec."
[fetest,INFO] Removed exclusive access mode from "/Equipment/Trigger/Statistics/kBytes per sec."
[fetest,INFO] Removed open record flag from "/Equipment/Periodic/Variables"
[fetest,INFO] Removed exclusive access mode from "/Equipment/Periodic/Variables"
[fetest,INFO] Removed open record flag from "/Equipment/Scaler/Variables"
[fetest,INFO] Removed exclusive access mode from "/Equipment/Scaler/Variables"
[fetest,INFO] Corrected 12 ODB entries
[fetest,INFO] Deleted entry '/System/Clients/20257' for client 'mhttpd' because it is not connected to ODB
OK
Init hardware...frontend_init!
Event size set to 10240 bytes
Ring buffer wait sleep 1 ms
OK
time 1564130782, data 91.354546
time 1564130783, data 93.358040
time 1564130784, data 95.105652
time 1564130785, data 96.592583
time 1564130786, data 97.814758
time 1564130787, data 98.768837
time 1564130788, data 99.452187
time 1564130789, data 99.862953
time 1564130790, data 100.000000
time 1564130791, data 99.862953
Warning: bank RND4 has zero size
time 1564130792, data 99.452187
time 1564130793, data 98.768837
time 1564130794, data 97.814758
time 1564130795, data 96.592583
Received break. Aborting...
frontend_exit!
Frontend shut down.
[lm17773@it038146 bin]$ 
=================================================================================



> > Hi,
> > 
> > We've been trying to run Fetest in the attempt of plotting the sine wave data on
> > the history page on the web server. However each time we've tried running a new
> > plot we have come across the error of 'no data' from the variables. In the
> > status page we are clearly obtaining data from the frontend and it is updating
> > the variable as expected in SLOW.
> > 
> > When setting up MIDAS we managed to produce a history plot from Fetest but are
> > unable to do so any longer. We did have a go at modifying the Fetest code but
> > created a backup before doing so and are now running the original backup.
> > 
> > What could be causing the Fetest data not to be showing in the history plot?
> 
> Is the logger running? (this application is handling the history data).
> If yes: Did you change the variable names? If yes: restart the logger.
  1634   26 Jul 2019 Nik BergerBug ReportHistory/Endianness
Hi,
I have a bank of floats with slow control values that I store to the history and
ODB. When reading the history, both in the webbrowser and with mhist, the floats
get read with the wrong endianness; under /equipment/variables in the ODB they
however display correctly. System is a an intel OpenSuse linux box. Any ideas?

Thanks

Nik
  1633   25 Jul 2019 Frederik WautersForumHow to convert C midas frontends to C++ (my problem solved)
Ok, so the detail that I missed was that the dummy functions

INT poll_event(INT source[], INT count, BOOL test)
{
   return 1;
};

as shown in some of the older examples, work when you set

INT poll_event(INT source, INT count, BOOL test)
{
   return 1;
};


as a side comment, not all drivers are c++ compatible yet (e.g. mscbvr), so changes needed are small 
  Draft   25 Jul 2019 HassanBug ReportFetest History Plot

=================================================================
[lm17773@it038146 bin]$ fetest
Frontend name          :     fetest
Event buffer size      :     10485760
User max event size    :     4194304
User max frag. size    :     4194304
# of events per buffer :     2

Connect to experiment sampleexpt...
OK
Init hardware...frontend_init!
Event size set to 10240 bytes
Ring buffer wait sleep 1 ms
OK
time 1564044856, data 74.314484
time 1564044857, data 77.714600
time 1564044858, data 80.901703
time 1564044859, data 83.867058
time 1564044860, data 86.602539
time 1564044861, data 89.100655
time 1564044862, data 91.354546
time 1564044863, data 93.358040
time 1564044864, data 95.105652
time 1564044865, data 96.592583
Warning: bank RND4 has zero size
time 1564044866, data 97.814758
time 1564044867, data 98.768837
time 1564044868, data 99.452187
time 1564044869, data 99.862953
time 1564044870, data 100.000000
time 1564044872, data 99.452187
time 1564044873, data 98.768837
Warning: bank RND6 has zero size
time 1564044874, data 97.814758
Received break. Aborting...
frontend_exit!
Frontend shut down.
[lm17773@it038146 bin]$ 
===========================================================================



10:00:56.999 2019/07/25 [fetest,INFO] Program fetest on host localhost stopped

10:00:32.483 2019/07/25 [mhttpd,INFO] Run #29 stopped

09:59:10.666 2019/07/25 [fetest,INFO] Program fetest on host localhost started

09:59:07.731 2019/07/25 [fetest,INFO] Program fetest on host localhost stopped

09:58:13.700 2019/07/25 [Logger,INFO] Program Logger on host localhost started

09:58:12.707 2019/07/25 [Logger,INFO] Program Logger on host localhost stopped

09:57:19.136 2019/07/25 [mhttpd,INFO] Run #29 started

09:57:18.954 2019/07/25 [Logger,ERROR] [mlogger.cxx:3801:log_create_writer,ERROR] channel  requested GZIP/ZLIB compression, but ZLIB is not available

09:57:15.305 2019/07/25 [mhttpd,INFO] Run #28 stopped

09:55:30.694 2019/07/25 [fetest,INFO] Program fetest on host localhost started

09:54:34.519 2019/07/25 [fetest,INFO] Program fetest on host localhost stopped

09:54:16.852 2019/07/25 [fetest,INFO] Program fetest on host localhost started

09:53:59.554 2019/07/25 [fetest,INFO] Program fetest on host localhost stopped

09:47:25.932 2019/07/25 [mhttpd,INFO] Program mhttpd on host localhost started

09:47:19.863 2019/07/25 [Logger,INFO] Program Logger on host localhost started

09:47:04.116 2019/07/25 [fetest,ERROR] [midas.cxx:6690:cm_shutdown,ERROR] Killing and Deleting client 'fetest' pid 1921

09:47:04.116 2019/07/25 [fetest,ERROR] [midas.cxx:6687:cm_shutdown,ERROR] Cannot connect to client 'fetest' on host 'localhost', port 38595

09:47:04.116 2019/07/25 [fetest,ERROR] [midas.cxx:10497:rpc_client_connect,ERROR] cannot connect to host "localhost", port 38595: connect() returned -1, errno 111 (Connection refused)

09:47:04.116 2019/07/25 [fetest,INFO] Program fetest on host localhost started

09:47:04.116 2019/07/25 [fetest,INFO] Deleted entry '/System/Clients/1613' for client 'mhttpd' because it is not connected to ODB

09:47:04.116 2019/07/25 [fetest,INFO] Corrected 9 ODB entries

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Equipment/random/Statistics"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Equipment/random/Statistics"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Equipment/random/Common"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Equipment/random/Common"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Equipment/slow/Statistics"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Equipment/slow/Statistics"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Equipment/slow/Common"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Equipment/slow/Common"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Equipment/test/Statistics"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Equipment/test/Statistics"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Equipment/test/Common"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Equipment/test/Common"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Sequencer/State"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Sequencer/State"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Experiment/Security/mhttpd hosts/Allowed hosts"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Experiment/Security/mhttpd hosts/Allowed hosts"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Experiment/Security/RPC hosts/Allowed hosts"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Experiment/Security/RPC hosts/Allowed hosts"

09:47:04.115 2019/07/25 [fetest,ERROR] [odb.cxx:1646:db_open_database,ERROR] Removed ODB client 'fetest', index 2 because process pid 1921 does not exists

09:47:04.115 2019/07/25 [fetest,ERROR] [odb.cxx:1646:db_open_database,ERROR] Removed ODB client 'mhttpd', index 0 because process pid 1613 does not exists
===========================================================================















> > Hi,
> > 
> > We've been trying to run Fetest in the attempt of plotting the sine wave data on
> > the history page on the web server. However each time we've tried running a new
> > plot we have come across the error of 'no data' from the variables. In the
> > status page we are clearly obtaining data from the frontend and it is updating
> > the variable as expected in SLOW.
> > 
> > When setting up MIDAS we managed to produce a history plot from Fetest but are
> > unable to do so any longer. We did have a go at modifying the Fetest code but
> > created a backup before doing so and are now running the original backup.
> > 
> > What could be causing the Fetest data not to be showing in the history plot?
> 
> Is the logger running? (this application is handling the history data).
> If yes: Did you change the variable names? If yes: restart the logger.
  1631   24 Jul 2019 Pierre-Andre AmaudruzBug ReportFetest History Plot
> Hi,
> 
> We've been trying to run Fetest in the attempt of plotting the sine wave data on
> the history page on the web server. However each time we've tried running a new
> plot we have come across the error of 'no data' from the variables. In the
> status page we are clearly obtaining data from the frontend and it is updating
> the variable as expected in SLOW.
> 
> When setting up MIDAS we managed to produce a history plot from Fetest but are
> unable to do so any longer. We did have a go at modifying the Fetest code but
> created a backup before doing so and are now running the original backup.
> 
> What could be causing the Fetest data not to be showing in the history plot?

Is the logger running? (this application is handling the history data).
If yes: Did you change the variable names? If yes: restart the logger.
  1630   23 Jul 2019 Lukas GerritzenForumHow to convert C midas frontends to C++
Can you post the exact command that cmake executes to link sc_fe_mini (with make VERBOSE=1)?

I have noticed similar linking problems that depended on the order when linking. In my case, it 
compiled when "-lpthread -lutil -lrt" were at the end of the command, but not before mfe.o and 
libmidas.a. Unfortunately I haven't found a way to tell cmake the "correct" order of the link 
libraries.

Maybe this can be fixed by adding midas as a subdirectory in your cmake project and just linking 
against the "mfe" target instead of libmfe.a.
  1629   23 Jul 2019 Stefan RittForumHow to convert C midas frontends to C++
Have you left any "extern C" in your frontend program or in any of the used header file. Seems 
like the linker cannot find the poll_event in your frontend code. If it's there, but it's compiled 
with C calling (instead of C++), the name mangling causes it to be invisible to the linker. That 
usually happens if there is somewhere

extern C {
  INT poll_event();
  ... 
}

while it is NOT defined as "extern C" in mfe.h which is used by mfe.cxx.

Stefan

> > Did you include mfe.h as written in elog:1526 ?
> > 
> > Stefan
> 
> 
> Yes I did
> 
> this is my include 
> 
> #include <stdio.h>
> #include <string.h>
> #include <assert.h>
> #include <math.h>
> #include <pthread.h>
> 
> 
> #include "midas.h"
> #include "mscb.h"
> #include "multi.h"
> #include "mscbdev.h"
> #include "mfe.h"
> 
> (I attach my dummy fe)
> 
> What confuses me is that I can compile examples/experiment/ if I copy that to a 
> fresh dir.
> 
> I also copied the CMakeLists from the example:
> 
> #
> # cmake for the muX software
> #
> cmake_minimum_required(VERSION 3.3)
> 
> project(muX)
> 
> #
> # find midas installation, from CMakeLists in examples/experiment
> #
> set(MIDAS_DIR $ENV{MIDASSYS})
> message("MIDAS dir: " ${MIDAS_DIR})
> if (NOT EXISTS $ENV{MIDASSYS})
>   message(FATAL_ERROR "Environment variable $MIDASSYS not defined, aborting.")
> endif()
> 
> set(INC_PATH ${MIDAS_DIR}/include ${MIDAS_DIR}/mxml ${MIDAS_DIR}/mscb/include 
> ${MIDAS_DIR}/drivers/class ${MIDAS_DIR}/drivers/device)
> link_directories($ENV{MIDASSYS}/lib)
> 
> # enable certain compile warnings
> add_compile_options(-Wall -Wformat=2 -Wno-format-nonliteral -Wno-strict-
> aliasing -Wuninitialized -Wno-unused-function)
> 
> set(LIBS -lpthread -lutil -lrt) 
> 
> 
> add_executable(sc_fe_mini sc_fe_mini.cpp)
> target_include_directories(sc_fe_mini PRIVATE ${INC_PATH})
> target_link_libraries(sc_fe_mini mfe midas ${LIBS})
  1628   23 Jul 2019 Frederik WautersForumHow to convert C midas frontends to C++
> Did you include mfe.h as written in elog:1526 ?
> 
> Stefan


Yes I did

this is my include 

#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <math.h>
#include <pthread.h>


#include "midas.h"
#include "mscb.h"
#include "multi.h"
#include "mscbdev.h"
#include "mfe.h"

(I attach my dummy fe)

What confuses me is that I can compile examples/experiment/ if I copy that to a 
fresh dir.

I also copied the CMakeLists from the example:

#
# cmake for the muX software
#
cmake_minimum_required(VERSION 3.3)

project(muX)

#
# find midas installation, from CMakeLists in examples/experiment
#
set(MIDAS_DIR $ENV{MIDASSYS})
message("MIDAS dir: " ${MIDAS_DIR})
if (NOT EXISTS $ENV{MIDASSYS})
  message(FATAL_ERROR "Environment variable $MIDASSYS not defined, aborting.")
endif()

set(INC_PATH ${MIDAS_DIR}/include ${MIDAS_DIR}/mxml ${MIDAS_DIR}/mscb/include 
${MIDAS_DIR}/drivers/class ${MIDAS_DIR}/drivers/device)
link_directories($ENV{MIDASSYS}/lib)

# enable certain compile warnings
add_compile_options(-Wall -Wformat=2 -Wno-format-nonliteral -Wno-strict-
aliasing -Wuninitialized -Wno-unused-function)

set(LIBS -lpthread -lutil -lrt) 


add_executable(sc_fe_mini sc_fe_mini.cpp)
target_include_directories(sc_fe_mini PRIVATE ${INC_PATH})
target_link_libraries(sc_fe_mini mfe midas ${LIBS})
Attachment 1: sc_fe_mini.cpp
/********************************************************************\
 
 Name:         sc_fe.c
 Created by:   Stefan Ritt
 		Frederik Wauters
 		Andreas Knecht
 
 Contents:     Slow control frontend for the muX  experiment
 
 $Id: sc_fe.c 21520 2014-11-03 12:03:56Z ritt $
 
 \********************************************************************/

#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <math.h>
#include <pthread.h>


#include "midas.h"
#include "mscb.h"
#include "multi.h"
#include "mscbdev.h"
#include "mfe.h"

/*-- Globals -------------------------------------------------------*/

/* The frontend name (client name) as seen by other MIDAS clients   */
const char *frontend_name = "SC Frontend";
/* The frontend file name, don't change it */
const char *frontend_file_name = __FILE__;

/* frontend_loop is called periodically if this variable is TRUE    */
BOOL frontend_call_loop = TRUE;

/* a frontend status page is displayed with this frequency in ms    */
INT display_period = 0;//1000;

/* maximum event size produced by this frontend */
INT max_event_size = 5*100000;

/* maximum event size for fragmented events (EQ_FRAGMENTED) */
INT max_event_size_frag = 5 * 1024 * 1024;

/* buffer size to hold events */
INT event_buffer_size = 2 *5* 100000;




/*-- Equipment list ------------------------------------------------*/

/* device driver list */


// New HV power supply with "many" channels
DEVICE_DRIVER hv_driver[] = {
    {"64xHV-PSI", mscbdev, 0, NULL, DF_MULTITHREAD},
    {""}
};


/*DEVICE_DRIVER cfd_driver[] = {
    {"CFD-950", mscbdev, 0, NULL, DF_INPUT | DF_MULTITHREAD},
    {""}
};

DEVICE_DRIVER pressure_driver[] = {
    {"PFEIFFER", mscbdev, 0, NULL, DF_INPUT | DF_MULTITHREAD},
    {""}
};

DEVICE_DRIVER multi_driver[] = {
    {"ADC", mscbdev, 0, NULL, DF_INPUT | DF_MULTITHREAD},
    {""}
};

DEVICE_DRIVER autofill_A_driver[] = {
    {"Input", mscbdev, 0, NULL, DF_INPUT | DF_MULTITHREAD},
    {"Output", mscbdev, 0, NULL, DF_OUTPUT | DF_MULTITHREAD},
    {""}
};

DEVICE_DRIVER autofill_B_driver[] = {
    {"Input", mscbdev, 0, NULL, DF_INPUT | DF_MULTITHREAD},
    {"Output", mscbdev, 0, NULL, DF_OUTPUT | DF_MULTITHREAD},
    {""}
};

// HV device with hardware ramp and 1 channel per node
DEVICE_DRIVER poshv_driver[] = {
   {"PMT", mscbhvr, 0, NULL, DF_HW_RAMP | DF_PRIO_DEVICE | DF_MULTITHREAD},
   {""}
};*/

EQUIPMENT equipment[] = {
    
    

    
    {"SiPM_HV",                       /* equipment name */
        {10, 0,                     /* event ID, trigger mask */
            "SYSTEM",                  /* event buffer */
            EQ_SLOW,                   /* equipment type */
            0,                         /* event source */
            "MIDAS",                   /* format */
            TRUE,                      /* enabled */
            RO_ALWAYS,
            60000,                     /* produce event every 60 sec */
            1000,                      /* read one event every second */
            0,                         /* number of sub events */
            1,                        /* log history every 10 seconds event */
            "", "", ""} ,
        cd_multi_read,                 /* readout routine */
        cd_multi,                      /* class driver main routine */
        hv_driver,                  /* device driver list */
        NULL,                       /* init string */
    },
    
    
    //    {"CFD",                     /* equipment name */
    //    {11, 0,                     /* event ID, trigger mask */
    //     "SYSTEM",                  /* event buffer */
    //     EQ_SLOW,                   /* equipment type */
    //     0,                         /* event source */
    //     "MIDAS",                   /* format */
    //     TRUE,                      /* enabled */
    //     RO_ALWAYS,
    //     60000,                     /* read every 60 sec */
    //     1000,                      /* read one event every second */
    //     0,                         /* number of sub events */
    //     1,                         /* log history every second */
    //     "", "", ""} ,
    //    cd_multi_read,              /* readout routine */
    //    cd_multi,                   /* class driver main routine */
    //    cfd_driver,                 /* device driver list */
    //    NULL,                       /* init string */
    //    },
    
    //   {"Pressures",                /* equipment name */
    //    {12, 0,                     /* event ID, trigger mask */
    //     "SYSTEM",                  /* event buffer */
    //     EQ_SLOW,                   /* equipment type */
    //     0,                         /* event source */
    //     "MIDAS",                   /* format */
    //     TRUE,                      /* enabled */
    //     RO_ALWAYS,
    //     60000,                     /* read every 60 sec */
    //     1000,                      /* read one event every second */
    //     0,                         /* number of sub events */
    //     1,                         /* log history every second */
    //    "", "", ""} ,
    //    cd_multi_read,              /* readout routine */
    //    cd_multi,                   /* class driver main routine */
    //    pressure_driver,            /* device driver list */
    //    NULL,                    
    
    {""}
};

/*-- Dummy routines ------------------------------------------------*/

INT poll_event(INT source[], INT count, BOOL test)
{
    return 1;
};
INT interrupt_configure(INT cmd, INT source[], PTYPE adr)
{
    return 1;
};

/*-- Function to define MSCB variables in a convenient way ---------*/

void mscb_define(const char *submaster, const char *equipment, const char *devname, DEVICE_DRIVER *driver, 
                 int address, unsigned char var_index, const char *name, double threshold)
{
   int i, dev_index, chn_index, chn_total;
   char str[256];
   float f_threshold;
   HNDLE hDB;

   cm_get_experiment_database(&hDB, NULL);

   if (submaster && submaster[0]) {
      sprintf(str, "/Equipment/%s/Settings/Devices/%s/Device", equipment, devname);
      db_set_value(hDB, 0, str, submaster, 32, 1, TID_STRING);
      sprintf(str, "/Equipment/%s/Settings/Devices/%s/Pwd", equipment, devname);
      db_set_value(hDB, 0, str, "meg", 32, 1, TID_STRING);
   }

   /* find device in device driver */
   for (dev_index=0 ; driver[dev_index].name[0] ; dev_index++)
      if (equal_ustring(driver[dev_index].name, devname))
         break;

   if (!driver[dev_index].name[0]) {
      cm_msg(MERROR, "mscb_define", "Device \"%s\" not present in device driver list", devname);
      return;
   }

   /* count total number of channels */
   for (i=chn_total=0 ; i<=dev_index ; i++)
      chn_total += driver[i].channels;

   chn_index = driver[dev_index].channels;
   sprintf(str, "/Equipment/%s/Settings/Devices/%s/MSCB Address", equipment, devname);
   db_set_value_index(hDB, 0, str, &address, sizeof(int), chn_index, TID_INT, TRUE);
   sprintf(str, "/Equipment/%s/Settings/Devices/%s/MSCB Index", equipment, devname);
   db_set_value_index(hDB, 0, str, &var_index, sizeof(char), chn_index, TID_BYTE, TRUE);

   if (threshold != -1) {
     sprintf(str, "/Equipment/%s/Settings/Update Threshold", equipment);
     f_threshold = (float) threshold;
     db_set_value_index(hDB, 0, str, &f_threshold, sizeof(float), chn_total, TID_FLOAT, TRUE);
   }

   if (name && name[0]) {
      sprintf(str, "/Equipment/%s/Settings/Names Input", equipment);
      db_set_value_index(hDB, 0, str, name, 32, chn_total, TID_STRING, TRUE);
   }

   /* increment number of channels for this driver */
   driver[dev_index].channels++;
}

void scfe_error(const char *error)
{
    char str[256];
    
    strlcpy(str, error, sizeof(str));
    cm_msg(MERROR, "scfe_error", "%s", str);
    al_trigger_alarm("MSCB", str, "MSCB Alarm", "Communication Problem", AT_INTERNAL);
}

/*-- Frontend Init -------------------------------------------------*/

INT frontend_init()
{
    HNDLE hDB;
    //int i, im, iv;
    //char str[80];
    
    cm_get_experiment_database(&hDB, NULL);
    
    /* set error dispatcher for alarm functionality */
    mfe_set_error(scfe_error);
    
    /* set maximal retry count */
    mscb_set_max_retry(100);
    

    
    /* HV */
    // New SiPM power supply with many channels
    mscb_define("mscb267.psi.ch", "SiPM_HV", "64xHV-PSI", hv_driver, 1, 0, "Temperature 1", 0.1);
        
    return CM_SUCCESS;
}

/*-- Frontend Exit -------------------------------------------------*/

INT frontend_exit()
{
    return CM_SUCCESS;
}

/*-- Begin of Run --------------------------------------------------*/

INT begin_of_run(INT run_number, char *error)
{
    return CM_SUCCESS;
}

/*-- End of Run ----------------------------------------------------*/

INT end_of_run(INT run_number, char *error)
{
    return CM_SUCCESS;
}

/*-- Pause Run -----------------------------------------------------*/

INT pause_run(INT run_number, char *error)
{
    return CM_SUCCESS;
}

/*-- Resuem Run ----------------------------------------------------*/

INT resume_run(INT run_number, char *error)
{
    return CM_SUCCESS;
}

/*-- Frontend Loop -------------------------------------------------*/

INT frontend_loop()
{
... 6 more lines ...
  1627   23 Jul 2019 Stefan RittForumHow to convert C midas frontends to C++
Did you include mfe.h as written in elog:1526 ?

Stefan
  1626   23 Jul 2019 Frederik WautersForumHow to convert C midas frontends to C++
I am moving our fe code to c++ midas with cmake. I did encounter your a) problems.

How do I solve mismatched declarations in the mfe (or other places in the midas code)? It is having issues with the midas defined BOOL/... types. This 
is what I get for a minimal scfe:

[ 12%] Building CXX object CMakeFiles/sc_fe_mini.dir/sc_fe_mini.cpp.o
[ 25%] Building CXX object CMakeFiles/sc_fe_mini.dir/home/frederik/packages/midas/drivers/class/hv.cxx.o
[ 37%] Building CXX object CMakeFiles/sc_fe_mini.dir/home/frederik/packages/midas/drivers/class/multi.cxx.o
[ 50%] Building CXX object CMakeFiles/sc_fe_mini.dir/home/frederik/packages/midas/drivers/device/nulldev.cxx.o
[ 62%] Building CXX object CMakeFiles/sc_fe_mini.dir/home/frederik/packages/midas/drivers/bus/null.cxx.o
[ 75%] Building CXX object CMakeFiles/sc_fe_mini.dir/home/frederik/packages/midas/drivers/device/mscbdev.cxx.o
[ 87%] Building CXX object CMakeFiles/sc_fe_mini.dir/home/frederik/packages/midas/mscb/src/mscb.cxx.o
[100%] Linking CXX executable sc_fe_mini
/home/frederik/packages/midas/build/libmfe.a(mfe.cxx.o): In function `_readout_thread':
/home/frederik/packages/midas/src/mfe.cxx:1271: undefined reference to `poll_event(int, int, unsigned int)'
/home/frederik/packages/midas/build/libmfe.a(mfe.cxx.o): In function `check_polled_events':
/home/frederik/packages/midas/src/mfe.cxx:1601: undefined reference to `poll_event(int, int, unsigned int)'
/home/frederik/packages/midas/src/mfe.cxx:1643: undefined reference to `poll_event(int, int, unsigned int)'
/home/frederik/packages/midas/build/libmfe.a(mfe.cxx.o): In function `readout_enable(unsigned int)':
/home/frederik/packages/midas/src/mfe.cxx:1158: undefined reference to `interrupt_configure(int, int, long)'
/home/frederik/packages/midas/src/mfe.cxx:1156: undefined reference to `interrupt_configure(int, int, long)'
/home/frederik/packages/midas/build/libmfe.a(mfe.cxx.o): In function `initialize_equipment':
/home/frederik/packages/midas/src/mfe.cxx:614: undefined reference to `interrupt_configure(int, int, long)'
/home/frederik/packages/midas/src/mfe.cxx:649: undefined reference to `poll_event(int, int, unsigned int)'
/home/frederik/packages/midas/build/libmfe.a(mfe.cxx.o): In function `scheduler':
/home/frederik/packages/midas/src/mfe.cxx:1890: undefined reference to `poll_event(int, int, unsigned int)'
/home/frederik/packages/midas/src/mfe.cxx:1932: undefined reference to `poll_event(int, int, unsigned int)'
/home/frederik/packages/midas/build/libmfe.a(mfe.cxx.o): In function `main':
/home/frederik/packages/midas/src/mfe.cxx:2701: undefined reference to `interrupt_configure(int, int, long)'
/home/frederik/packages/midas/src/mfe.cxx:2702: undefined reference to `interrupt_configure(int, int, long)'
collect2: error: ld returned 1 exit status
make[2]: *** [sc_fe_mini] Error 1
make[1]: *** [CMakeFiles/sc_fe_mini.dir/all] Error 2
make: *** [all] Error 2


This is my cmakelists for my user code:

#
# cmake for the muX software
#
cmake_minimum_required(VERSION 3.3)

project(muX)

#
# find installations
#
set(MIDAS_DIR $ENV{MIDASSYS})
message("MIDAS dir: " ${MIDAS_DIR})

#
# set directories
#
set(MIDASBUILD_DIR ${MIDAS_DIR}/build)
set(MIDASINCLUDE_DIR ${MIDAS_DIR}/include)
set(MXML_DIR ${MIDAS_DIR}/mxml)
set(MSCB_DIR ${MIDAS_DIR}/mscb)
set(DRV_DIR ${MIDAS_DIR}/drivers)


#
# drivers, libs
#
set(DRIVERS
    ${MIDAS_DIR}/drivers/class/hv
    ${MIDAS_DIR}/drivers/class/multi
    ${MIDAS_DIR}/drivers/device/nulldev
    ${MIDAS_DIR}/drivers/bus/null
)
set(MIDASLIB ${MIDASBUILD_DIR}/libmidas.a)
set(FELIB ${MIDASBUILD_DIR}/libmfe.a)

#
# sc_fe
#
add_executable(sc_fe_mini
        sc_fe_mini.cpp
        ${DRIVERS}
        ${MIDAS_DIR}/drivers/device/mscbdev
        ${MIDAS_DIR}/mscb/src/mscb)

target_include_directories(sc_fe_mini PRIVATE ${DRV_DIR} ${MIDAS_DIR}/mscb/include ${MIDAS_DIR}/include)
target_link_libraries(sc_fe_mini ${LIBS} ${MIDASLIB} ${FELIB} rt pthread util)



I seem to be able to compile the current midas distributions, including the scfe frontend



> To convert a MIDAS frontend to C++ follow this checklist:
> 
> a) add #include "mfe.h" after include of midas.h and fix all compilation errors.
> 
> NOTE: there should be no "extern C"  brackets around MIDAS include files.
> 
> NOTE: Expect to see following problems:
> 
> a1) duplicate or mismatched declarations of functions defined in mfe.h
> a2) frontend_name and frontend_file_name should be "const char*" instead of "char*"
> a3) duplicate "HNDLE hDB" collision with hDB from mfe.c - not sure why it worked before, either use HNDLE hDB from mfe.h or use "extern HNDLE hDB".
> a4) poll_event() and interrupt_configure() have "source" as "int[]" instead of "int" (why did this work before?)
> a5) use of "extern int frontend_index" instead of get_frontend_index() from mfe.h
> a6) bk_create() last argument needs to be cast to (void**)
> a7) "bool debug" collides with "debug" from mfe.h (why did this work before?)
> 
> b) remove no longer needed "extern C" brackets around mfe related code. Ideally there should be no "extern C" brackets anywhere.
> 
> c) in the Makefile, change CC=gcc to CC=g++ for compiling and linking everything as C++
> 
> c1) fix all compilation problems. most valid C code will compile as valid C++, but there is some known trouble:
> - return value of malloc() & co needs to be cast to the correct data type: "char* s = (char*)malloc(...)"
> - some C++ compilers complain about mismatch between signed and unsigned values
> 
> If you need help with converting your frontend from C to C++, I will be most happy
> to assist you - post your compiler error messages to this forum or email them to me privately.
> 
> Good luck,
> K.O.
  1625   22 Jul 2019 HassanBug ReportFetest History Plot
Hi,

We've been trying to run Fetest in the attempt of plotting the sine wave data on
the history page on the web server. However each time we've tried running a new
plot we have come across the error of 'no data' from the variables. In the
status page we are clearly obtaining data from the frontend and it is updating
the variable as expected in SLOW.

When setting up MIDAS we managed to produce a history plot from Fetest but are
unable to do so any longer. We did have a go at modifying the Fetest code but
created a backup before doing so and are now running the original backup.

What could be causing the Fetest data not to be showing in the history plot?
  1624   21 Jul 2019 Konstantin OlchanskiInfoerror handling is hard
Happy summer to everybody.

When programming in general, and when programming MIDAS, there is always a struggle
with error handling. Too much? Too little? Visually, some MIDAS functions are 90% error handling, 10% useful work, if that.

What is the right way to do this?
Where is the balance?
Would c++ exceptions help or hinder?
How to make it better?

It turns out that the Go community have been struggling with exactly this for the last year or so.

Read the (ultimately rejected) proposal for improved error handling in Go. All the problems and difficulties
and struggles facing the programmer and the language designer spread right in front of us.

https://go.googlesource.com/proposal/+/master/design/go2draft-error-handling-overview.md

(To remember, Go is this: https://www.oreilly.com/library/view/the-go-programming/9780134190570/
The language designers are Brian W. Kernighan, Rob Pike, Ken Thompson and "some other people"
(Dennis Ritchie is no longer with us). These people gave us UNIX and C (and C++, the C++ guy was
their next-door-office mate), when that crowd speaks, I listen)

That write-up refers to some blogger's vivid illustration how correct error handling is hard,
with special focus on error handling in the presence of exceptions:

https://devblogs.microsoft.com/oldnewthing/?p=39683
https://devblogs.microsoft.com/oldnewthing/?p=36693

I read all this stuff and said, "wow, this is the reader's digest version of my life in computer programming".

The clincher from this last guy? "My point isnít that exceptions are bad.
My point is that exceptions are too hard and Iím not smart
enough to handle them."

"back to writing some error handling code",
K.O.
  1623   16 Jul 2019 Konstantin OlchanskiBug Reporta3818 and signals, Frontend killed at stop of run
> Message from John M O'Donnell <odonnell@lanl.gov>
>
> the A3818 and MIDAS both used unix alarm signals, resulting in clashes.
>

FWIW, current midas no longer uses alarm signals. See forum messages and git commits about 
removal of cm_watchdog().

K.O.
  1622   16 Jul 2019 Konstantin OlchanskiBug Reporta3818 and signals, Frontend killed at stop of run
Message from John M O'Donnell <odonnell@lanl.gov>

Folks,

The following might be related, if so great, if not sorry for the spam.

We had problems with MIDAS/CAEN_A3818 until two things happened:

1) CAEN found the root cause of a problem, as the A3818 and MIDAS both
used unix alarm signals, resulting in clashes.† CAEN modified the
A3818 driver to have a "no alarm" option.

2) after downloading the modified driver, edit src/a3818.c to #define
USE_MIDAS 1 somewhere near the top.

Hope this helps,

John.
ELOG V3.1.4-2e1708b5