Hey everyone,

When I run mhttpd I get the following error message:

[mhttpd,ERROR] [odb.cxx:1720:db_open_database,ERROR] Removed ODB client 
'mhttpd', index 0 because process pid 4531 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 "/Sequencer/State"
[mhttpd,INFO] Removed exclusive access mode from "/Sequencer/State"
[mhttpd,INFO] Corrected 3 ODB entries
[mhttpd,INFO] Deleted entry '/System/Clients/4531' for client 'mhttpd' because 
it is not connected to ODB
[mhttpd,INFO] Client 'mhttpd' on buffer 'SYSMSG' removed by bm_open_buffer 
because process pid 4531 does not exist
Mongoose web server will not use password protection
mongoose web server is listening on the HTTP port 8080

So mhttpd works as I have access to it through my browser but mlogger does not 
work when I try running it (Alarm: Program Logger is not running). I've 
managed to get mlogger working before and I think that the problem might be 
from maybe having another instance of ODB running without me knowing. 

Has anyone ever had this issue?

Thanks so much for your time.

Isaac

The function stime() has been replaced by clock_settime() on Feb. 2020:

https://bitbucket.org/tmidas/midas/commits/c732120e7c68bbcdbbc6236c1fe894c401d9bbbd

Please always pull before submitting bug reports.

Best,
Stefan

Hi

I had a problem with the compilation of midas after an OS update to the recent version of OpenSuse tumbleweed. The function stime() in system.cxx:3196 is no longer available. 

In the documentation it is also marked as deprecated with the suggestion to use clock_settime instead:
https://man7.org/linux/man-pages/man2/stime.2.html

replacing system.cxx:3196 with the clock_settime - method in system.cxx:3200 - 3204 also for OS_UNIX seems to solve the problem, but i'm not sure if this will cause problems on older OS's.

Martin

> Hi, if you are not using any VME hardware, then you have no VME address jumpers to 
> set. https://en.wikipedia.org/wiki/VMEbus
> 
> K.O.

Hi thanks for taking the time to help me out. I am using a VME-MWS in this experiment.

Let me know what you think.

Isaac

Thanks you two once again for the very fast answers. I tested the example on the local machine and it works perfectly fine. In the meantime I also created two new drivers for our devices 
and everything works with them, the improvement in time is significant and I will create drivers for all our devices where possible. If they are in a working state I can also provide 
them to add to the Midas drivers. Of course if it would be possible to run the front-end also on our remote machines this would be even better. I am not experienced in any multi-threaded 
programming but if I can provide any help or input, please let me know. 

Have a great weekend,
Ivo

Few comments:

- As KO write, we might need semaphores also on a remote front-end, in case several programs share the same hardware. So it should work and cm_get_path() should not just exit

- When I wrote the multi-threaded device drivers, I did use semaphores instead of mutexes, but I forgot why. Might be that midas semaphores have a timeout and mutexes not, or 
something along those lines.

- I do need either semaphores or mutexes since in a multi-threaded slow-control font-end (too many dashes...) several threads have to access an internal data exchange buffer, which 
needs protection for multi-threaded environments.

So we can how either fix cm_get_path() or replace all semaphores in with mutexes in midas/src/device_driver.cxx. I have kind of a feeling that we should do both. And what about 
switching to c++ std::mutex instead of pthread mutexes?

Stefan

Yes, it is supposed to crash. On a remote frontend, cm_get_path() cannot be used
(we are on a different computer, all filesystems maybe no the same!) and is actually not set and
triggers a trap if something tries to use it. (this is the crash you see).

The caller to cm_get_path() is a MIDAS semaphore function.

And I think there is a mistake here. It is unusual for the driver framework to use a semaphore. For multithreaded
protection inside the frontend, a mutex would normally be used. (and mutexes do not use cm_get_path(), so
all is good). But if a semaphore is used, than all frontends running on the same computer become
serialized across the locked section. This is the right thing to do if you have multiple frontends
sharing the same hardware, i.e. a /dev/ttyUSB serial line, but why would a generic framework function
do this. I am not sure, I will have to take a look at why there is a semaphore and what it is locking/protecting.

(In midas, semaphores are normally used to protect global memory, such as ODB, or global resources, such as alarms,
against concurrent access by multiple programs, but of course that does not work for remote frontends,
they are on a different computer! semaphores only work locally, do not work across the network!)

K.O.

> 
> scfe: /home/neutron/packages/midas/src/midas.cxx:1569: INT cm_get_path(char*, int): Assertion `_path_name.length() > 0' failed.
> 
> Running the frontend with GDB and set a breakpoint at the exit leads to the following: 
> 
> (gdb) where
> #0  0x00007ffff68d599f in raise () from /lib64/libc.so.6
> #1  0x00007ffff68bfcf5 in abort () from /lib64/libc.so.6
> #2  0x00007ffff68bfbc9 in __assert_fail_base.cold.0 () from /lib64/libc.so.6
> #3  0x00007ffff68cde56 in __assert_fail () from /lib64/libc.so.6
> #4  0x000000000041efbf in cm_get_path (path=0x7fffffffd060 "P\373g", path_size=256)
>     at /home/neutron/packages/midas/src/midas.cxx:1563
> #5  cm_get_path (path=path@entry=0x7fffffffd060 "P\373g", path_size=path_size@entry=256)
>     at /home/neutron/packages/midas/src/midas.cxx:1563
> #6  0x0000000000453dd8 in ss_semaphore_create (name=name@entry=0x7fffffffd2c0 "DD_Input", 
>     semaphore_handle=semaphore_handle@entry=0x67f700 <multi_driver+96>)
>     at /home/neutron/packages/midas/src/system.cxx:2340
> #7  0x0000000000451d25 in device_driver (device_drv=0x67f6a0 <multi_driver>, cmd=<optimized out>)
>     at /home/neutron/packages/midas/src/device_driver.cxx:155
> #8  0x00000000004175f8 in multi_init(eqpmnt*) ()
> #9  0x00000000004185c8 in cd_multi(int, eqpmnt*) ()
> #10 0x000000000041c20c in initialize_equipment () at /home/neutron/packages/midas/src/mfe.cxx:827
> #11 0x000000000040da60 in main (argc=1, argv=0x7fffffffda48)
>     at /home/neutron/packages/midas/src/mfe.cxx:2757
> 
> I also tried to use the generic class driver which results in the same. I am not sure if this is a problem of the multi-threaded frontend running on a remote machine or is it 
> something of our system which is not properly set up. Anyway I am running out of ideas how to solve this and would appreciate any input. 
> 
> Thanks in advance,
> Ivo

Hi, if you are not using any VME hardware, then you have no VME address jumpers to 
set. https://en.wikipedia.org/wiki/VMEbus

K.O.

Dear all

To reduce the time needed by Midas between runs, we want to change some of our periodic equipment to multi-threaded slow-control equipment. To do that I wanted to start from 
the slowcont with the multi/hv class driver and the nulldev device driver and null bus driver. The example runs fine as it is on the local midas machine and also on remote 
machines. When adding the DF_MULTITHREAD flag to the device driver list, it does not run anymore on remote machines but aborts with the following assertion:

scfe: /home/neutron/packages/midas/src/midas.cxx:1569: INT cm_get_path(char*, int): Assertion `_path_name.length() > 0' failed.

Running the frontend with GDB and set a breakpoint at the exit leads to the following: 

(gdb) where
#0  0x00007ffff68d599f in raise () from /lib64/libc.so.6
#1  0x00007ffff68bfcf5 in abort () from /lib64/libc.so.6
#2  0x00007ffff68bfbc9 in __assert_fail_base.cold.0 () from /lib64/libc.so.6
#3  0x00007ffff68cde56 in __assert_fail () from /lib64/libc.so.6
#4  0x000000000041efbf in cm_get_path (path=0x7fffffffd060 "P\373g", path_size=256)
    at /home/neutron/packages/midas/src/midas.cxx:1563
#5  cm_get_path (path=path@entry=0x7fffffffd060 "P\373g", path_size=path_size@entry=256)
    at /home/neutron/packages/midas/src/midas.cxx:1563
#6  0x0000000000453dd8 in ss_semaphore_create (name=name@entry=0x7fffffffd2c0 "DD_Input", 
    semaphore_handle=semaphore_handle@entry=0x67f700 <multi_driver+96>)
    at /home/neutron/packages/midas/src/system.cxx:2340
#7  0x0000000000451d25 in device_driver (device_drv=0x67f6a0 <multi_driver>, cmd=<optimized out>)
    at /home/neutron/packages/midas/src/device_driver.cxx:155
#8  0x00000000004175f8 in multi_init(eqpmnt*) ()
#9  0x00000000004185c8 in cd_multi(int, eqpmnt*) ()
#10 0x000000000041c20c in initialize_equipment () at /home/neutron/packages/midas/src/mfe.cxx:827
#11 0x000000000040da60 in main (argc=1, argv=0x7fffffffda48)
    at /home/neutron/packages/midas/src/mfe.cxx:2757

I also tried to use the generic class driver which results in the same. I am not sure if this is a problem of the multi-threaded frontend running on a remote machine or is it 
something of our system which is not properly set up. Anyway I am running out of ideas how to solve this and would appreciate any input. 

Thanks in advance,
Ivo

Hey folks,

I'm currently working on setting up a MIDAS experiment and I am following the 
"Setup MIDAS experiment at Triumf" page on 
MidasWiki(https://midas.triumf.ca/MidasWiki/index.php/Setup_MIDAS_experiment_at_
TRIUMF).

The 3rd line of the hardware checklist under the "Prepare VME hardware section" 
has a link to a page that doesn't exit anymore, I'm trying to figure out how to 
setup the VME address jumpers on the VME modules.

Does anyone know how to setup the VME modules? Or, can anyone send me a link to 
instructions?

Thanks a lot for your time.

Isaac

Hi Stefan,

I agree with your explanation about the size of BOOL and bool. 

I checked the program also on my Raspberry and there the old code works like on your mac. I don't really understand 
why the behavior is different for my system. The initializing of the union should also work for my system. 

At the moment I am using:

Arch Linux
Linux office 5.4.42-1-lts #1 SMP Wed, 20 May 2020 20:42:53 +0000 x86_64 GNU/Linux
gcc version 10.1.0 (GCC)

One thing which makes me a bit suspicious is that if I do:

u_odb u = m_data[index];
char dest[rpc_tid_size(m_tid)];
memcpy(dest, &u, rpc_tid_size(m_tid));

Clion tells me "Clang-Tidy: Undefined behavior, source object type 'midas::u_odb' is not TriviallyCopyable". 

I am not sure if this is the problem since I am not so familiar with this TriviallyCopyable. I need to further investigate here.

So fare the update from my side.

Cheers,
Marius

> Hi Marius,
> 
> your fix is good. Thanks for digging out this deep-lying issue, which would have haunted us if we would not fix it. 
> The problem is that in midas, the "BOOL" type is 4 Bytes long, actually modelled after MS Windows. Now I realized
> that in c++, the "bool" type is only 1 Byte wide. So if we do the memcopy from a "c++ bool" to a "MIDAS BOOL", we
> always copy four bytes, meaning that we copy three Bytes beyond the one-byte value of the c++ bool. So your fix
> is absolutely correct, and I added it in one more space where we deal with bool arrays, where we need the same.
> 
> What I don't understand however is the fact why this fails for you. The ODB values are stored in the C union under
> 
> union {
>   ...
>   bool m_bool;
>   double m_double;
>   std::string *m_string;
>   ...
> }
> 
> Now the C compiler puts all values at the lowest address, so m_bool is at offset zero, and the string pointer reaches
> over all eight bytes (we are on 64-bit OS).
> 
> Now when I initialize this union in odbxx.h:66, I zero the string pointer which is the widest object:
> 
>   u_odb() : m_string{} {};
> 
> which (at least on my Mac) sets all eight bytes to zero. If I then use the wrong code to set the bool value to the ODB 
> in odbxx.cxx:756, I do 
> 
>   db_set_data_index(... &u, rpc_tid_size(m_tid), ...);
> 
> so it copies four bytes (=rpc_tid_size(TID_BOOL)) to the ODB. The first byte should be the c++ bool value (0 or 1),
> and the other three bytes should be zero from the initialization above. Apparently on your system, this is not
> the case, and I would like you to double check it. Maybe there is another underlying problem which I don't understand
> at the moment but which we better fix.
> 
> Otherwise the change is committed and your code should work. But we should not stop here! I really want to understand
> why this is not working for you, maybe I miss something.
> 
> Best,
> Stefan
> 
> > Hi Stefan,
> > 
> > your test program was only working for me after I changed the following lines inside the odbxx.cpp
> > 
> > diff --git a/src/odbxx.cxx b/src/odbxx.cxx
> > index 24b5a135..48edfd15 100644
> > --- a/src/odbxx.cxx
> > +++ b/src/odbxx.cxx
> > @@ -753,7 +753,12 @@ namespace midas {
> >           }
> >        } else {
> >           u_odb u = m_data[index];
> > -         status = db_set_data_index(m_hDB, m_hKey, &u, rpc_tid_size(m_tid), index, m_tid);
> > +         if (m_tid == TID_BOOL) {
> > +             BOOL ss = bool(u);
> > +             status = db_set_data_index(m_hDB, m_hKey, &ss, rpc_tid_size(m_tid), index, m_tid);
> > +         } else {
> > +             status = db_set_data_index(m_hDB, m_hKey, &u, rpc_tid_size(m_tid), index, m_tid);
> > +         }
> >           if (m_debug) {
> >              std::string s;
> >              u.get(s);
> > 
> > Likely not the best fix but otherwise I was always getting after running the test program:
> > 
> > [ODBEdit,INFO] Program ODBEdit on host localhost started
> > [local:Default:S]/>cd Equipment/Test/Settings/Test_odb_api/
> > key not found
> > makoeppe@office ~/mu3e/online/online (git)-[odb++_api] % test_connect
> > Created ODB key /Equipment/Test/Settings
> > Created ODB key /Equipment/Test/Settings/Test_odb_api
> > Created ODB key /Equipment/Test/Settings/Test_odb_api/Divider
> > Set ODB key "/Equipment/Test/Settings/Test_odb_api/Divider" = 1000
> > Created ODB key /Equipment/Test/Settings/Test_odb_api/Enable
> > Set ODB key "/Equipment/Test/Settings/Test_odb_api/Enable" = false
> > Get definition for ODB key "/Equipment/Test/Settings/Test_odb_api"
> > Get definition for ODB key "/Equipment/Test/Settings/Test_odb_api/Divider"
> > Get ODB key "/Equipment/Test/Settings/Test_odb_api/Divider": 1000
> > Get definition for ODB key "/Equipment/Test/Settings/Test_odb_api/Enable"
> > Get ODB key "/Equipment/Test/Settings/Test_odb_api/Enable": false
> > Get definition for ODB key "/Equipment/Test/Settings/Test_odb_api/Divider"
> > Get ODB key "/Equipment/Test/Settings/Test_odb_api/Divider": 1000
> > Get definition for ODB key "/Equipment/Test/Settings/Test_odb_api/Enable"
> > Get ODB key "/Equipment/Test/Settings/Test_odb_api/Enable": false
> > Datagenerator Enable is Get ODB key "/Equipment/Test/Settings/Test_odb_api/Enable": false
> > false
> > makoeppe@office ~/mu3e/online/online (git)-[odb++_api] % odbedit
> > [ODBEdit,INFO] Program ODBEdit on host localhost started
> > [local:Default:S]/>cd Equipment/Test/Settings/Test_odb_api/
> > [local:Default:S]Test_odb_api>ls
> > Divider                         1000
> > Enable                          y 
> > 
> > > > I am getting back false. Which looks nice but when I look into the odb via the browser the value is actually "y" meaning true which is stange. 
> > > > I added my frontend where I cleaned all function leaving only the frontend_init() one where I create this key. Its a cuda program but since 
> > > > I clean everything no cuda function is called anymore.

Hi Marius,

your fix is good. Thanks for digging out this deep-lying issue, which would have haunted us if we would not fix it. 
The problem is that in midas, the "BOOL" type is 4 Bytes long, actually modelled after MS Windows. Now I realized
that in c++, the "bool" type is only 1 Byte wide. So if we do the memcopy from a "c++ bool" to a "MIDAS BOOL", we
always copy four bytes, meaning that we copy three Bytes beyond the one-byte value of the c++ bool. So your fix
is absolutely correct, and I added it in one more space where we deal with bool arrays, where we need the same.

What I don't understand however is the fact why this fails for you. The ODB values are stored in the C union under

union {
  ...
  bool m_bool;
  double m_double;
  std::string *m_string;
  ...
}

Now the C compiler puts all values at the lowest address, so m_bool is at offset zero, and the string pointer reaches
over all eight bytes (we are on 64-bit OS).

Now when I initialize this union in odbxx.h:66, I zero the string pointer which is the widest object:

  u_odb() : m_string{} {};

which (at least on my Mac) sets all eight bytes to zero. If I then use the wrong code to set the bool value to the ODB 
in odbxx.cxx:756, I do 

  db_set_data_index(... &u, rpc_tid_size(m_tid), ...);

so it copies four bytes (=rpc_tid_size(TID_BOOL)) to the ODB. The first byte should be the c++ bool value (0 or 1),
and the other three bytes should be zero from the initialization above. Apparently on your system, this is not
the case, and I would like you to double check it. Maybe there is another underlying problem which I don't understand
at the moment but which we better fix.

Otherwise the change is committed and your code should work. But we should not stop here! I really want to understand
why this is not working for you, maybe I miss something.

Best,
Stefan

> Hi Stefan,
> 
> your test program was only working for me after I changed the following lines inside the odbxx.cpp
> 
> diff --git a/src/odbxx.cxx b/src/odbxx.cxx
> index 24b5a135..48edfd15 100644
> --- a/src/odbxx.cxx
> +++ b/src/odbxx.cxx
> @@ -753,7 +753,12 @@ namespace midas {
>           }
>        } else {
>           u_odb u = m_data[index];
> -         status = db_set_data_index(m_hDB, m_hKey, &u, rpc_tid_size(m_tid), index, m_tid);
> +         if (m_tid == TID_BOOL) {
> +             BOOL ss = bool(u);
> +             status = db_set_data_index(m_hDB, m_hKey, &ss, rpc_tid_size(m_tid), index, m_tid);
> +         } else {
> +             status = db_set_data_index(m_hDB, m_hKey, &u, rpc_tid_size(m_tid), index, m_tid);
> +         }
>           if (m_debug) {
>              std::string s;
>              u.get(s);
> 
> Likely not the best fix but otherwise I was always getting after running the test program:
> 
> [ODBEdit,INFO] Program ODBEdit on host localhost started
> [local:Default:S]/>cd Equipment/Test/Settings/Test_odb_api/
> key not found
> makoeppe@office ~/mu3e/online/online (git)-[odb++_api] % test_connect
> Created ODB key /Equipment/Test/Settings
> Created ODB key /Equipment/Test/Settings/Test_odb_api
> Created ODB key /Equipment/Test/Settings/Test_odb_api/Divider
> Set ODB key "/Equipment/Test/Settings/Test_odb_api/Divider" = 1000
> Created ODB key /Equipment/Test/Settings/Test_odb_api/Enable
> Set ODB key "/Equipment/Test/Settings/Test_odb_api/Enable" = false
> Get definition for ODB key "/Equipment/Test/Settings/Test_odb_api"
> Get definition for ODB key "/Equipment/Test/Settings/Test_odb_api/Divider"
> Get ODB key "/Equipment/Test/Settings/Test_odb_api/Divider": 1000
> Get definition for ODB key "/Equipment/Test/Settings/Test_odb_api/Enable"
> Get ODB key "/Equipment/Test/Settings/Test_odb_api/Enable": false
> Get definition for ODB key "/Equipment/Test/Settings/Test_odb_api/Divider"
> Get ODB key "/Equipment/Test/Settings/Test_odb_api/Divider": 1000
> Get definition for ODB key "/Equipment/Test/Settings/Test_odb_api/Enable"
> Get ODB key "/Equipment/Test/Settings/Test_odb_api/Enable": false
> Datagenerator Enable is Get ODB key "/Equipment/Test/Settings/Test_odb_api/Enable": false
> false
> makoeppe@office ~/mu3e/online/online (git)-[odb++_api] % odbedit
> [ODBEdit,INFO] Program ODBEdit on host localhost started
> [local:Default:S]/>cd Equipment/Test/Settings/Test_odb_api/
> [local:Default:S]Test_odb_api>ls
> Divider                         1000
> Enable                          y 
> 
> > > I am getting back false. Which looks nice but when I look into the odb via the browser the value is actually "y" meaning true which is stange. 
> > > I added my frontend where I cleaned all function leaving only the frontend_init() one where I create this key. Its a cuda program but since 
> > > I clean everything no cuda function is called anymore.

I am on branch develop and use the tmfe frontends. I found that a bool vector 
gets bigger every time I read it from the ODB.

Turns out in midasodb.cxx (as of commit 813f696, lines 478ff) the output vector 
"value" gets appended to without resizing.

Since after line 474 xvalue.size()==value.size() it would make sense to simply 
replace value->push_back() with value[i]= .

> > You made a mistake somewhere.
> 
> you are right !
> I used rootana-2020-03-a instead of release/rootana-2020-03... my fault !
> 
> I have to (re)compile MIDAS for the same error...

The MIDAS version, including what branch you have used is reported on the midas "help" page and in 
the odbedit "version" command.

For example my midas reports:
Tue Mar 24 20:54:11 2020 -0700 - midas-2020-03-a-98-g8b462cc9 on branch develop

This version string includes:
date of commit
git tag and commit number (see "git describe")
"-dirty" if you have modified sources ("git status" shows modified files)
and which git branch you have (I have "develop", you should have "release/midas-2020-03")

I am not sure how ROOTANA reports the version and build strings. I shall check..O...

K.O.

In glibc 2.31, the stime function was deprecated:

* The obsolete function stime is no longer available to newly linked
  binaries, and its declaration has been removed from <time.h>.
  Programs that set the system time should use clock_settime instead.

https://sourceware.org/legacy-ml/libc-announce/2020/msg00001.html

This creates a problem in src/system.cxx:3197:4

Hi Stefan,

your test program was only working for me after I changed the following lines inside the odbxx.cpp

diff --git a/src/odbxx.cxx b/src/odbxx.cxx
index 24b5a135..48edfd15 100644
--- a/src/odbxx.cxx
+++ b/src/odbxx.cxx
@@ -753,7 +753,12 @@ namespace midas {
          }
       } else {
          u_odb u = m_data[index];
-         status = db_set_data_index(m_hDB, m_hKey, &u, rpc_tid_size(m_tid), index, m_tid);
+         if (m_tid == TID_BOOL) {
+             BOOL ss = bool(u);
+             status = db_set_data_index(m_hDB, m_hKey, &ss, rpc_tid_size(m_tid), index, m_tid);
+         } else {
+             status = db_set_data_index(m_hDB, m_hKey, &u, rpc_tid_size(m_tid), index, m_tid);
+         }
          if (m_debug) {
             std::string s;
             u.get(s);

Likely not the best fix but otherwise I was always getting after running the test program:

[ODBEdit,INFO] Program ODBEdit on host localhost started
[local:Default:S]/>cd Equipment/Test/Settings/Test_odb_api/
key not found
makoeppe@office ~/mu3e/online/online (git)-[odb++_api] % test_connect
Created ODB key /Equipment/Test/Settings
Created ODB key /Equipment/Test/Settings/Test_odb_api
Created ODB key /Equipment/Test/Settings/Test_odb_api/Divider
Set ODB key "/Equipment/Test/Settings/Test_odb_api/Divider" = 1000
Created ODB key /Equipment/Test/Settings/Test_odb_api/Enable
Set ODB key "/Equipment/Test/Settings/Test_odb_api/Enable" = false
Get definition for ODB key "/Equipment/Test/Settings/Test_odb_api"
Get definition for ODB key "/Equipment/Test/Settings/Test_odb_api/Divider"
Get ODB key "/Equipment/Test/Settings/Test_odb_api/Divider": 1000
Get definition for ODB key "/Equipment/Test/Settings/Test_odb_api/Enable"
Get ODB key "/Equipment/Test/Settings/Test_odb_api/Enable": false
Get definition for ODB key "/Equipment/Test/Settings/Test_odb_api/Divider"
Get ODB key "/Equipment/Test/Settings/Test_odb_api/Divider": 1000
Get definition for ODB key "/Equipment/Test/Settings/Test_odb_api/Enable"
Get ODB key "/Equipment/Test/Settings/Test_odb_api/Enable": false
Datagenerator Enable is Get ODB key "/Equipment/Test/Settings/Test_odb_api/Enable": false
false
makoeppe@office ~/mu3e/online/online (git)-[odb++_api] % odbedit
[ODBEdit,INFO] Program ODBEdit on host localhost started
[local:Default:S]/>cd Equipment/Test/Settings/Test_odb_api/
[local:Default:S]Test_odb_api>ls
Divider                         1000
Enable                          y 

> > I am getting back false. Which looks nice but when I look into the odb via the browser the value is actually "y" meaning true which is stange. 
> > I added my frontend where I cleaned all function leaving only the frontend_init() one where I create this key. Its a cuda program but since 
> > I clean everything no cuda function is called anymore.

Dear Giorgio,

Thank you very much for your kind and quick reply!

I appreciate you giving me such a nice explanation, experience, and great sample codes (This is what I desired!).
They all are useful for me. I will try to write my frontend codes using gift from you.

Thank you again!

Best regards,
Hisataka Yoshida

Dear Stefan,

Thank you for you quick reply.


> Have you checked the documentation?
> 
> https://midas.triumf.ca/MidasWiki/index.php/Slow_Control_System

Yes, I have read the wiki, but not easy to figure out how I treat the individual case.

> Basically you have to replace the nulldevice driver with a "real" driver. You find all existing drivers under 
> midas/drivers/device. If your favourite is not there, you have to write it. Use one which is close to the one 
> you need and modify it.

Okay, I will try to write drivers for my own devices using existing drivers.
(maybe I can find some device drivers which uses TCP/IP, RS232)

Best regards,
Hisataka Yoshida

> I’m beginner of Midas, and trying to develop the slow control front-end with the latest Midas.
> I found the scfe.cxx in the “example”, but not enough to refer to write the front-end for my own devices 
> because it contains only nulldevice and null bus driver case...
> (I could have succeeded to run the HV front-end for ISEG MPod, because there is the device driver...)
> 
> Can I get some frontend examples such as simple TCP/IP and/or RS232 devices?
> Hopefully, I would like to have examples of frontend and device driver.
> (if any device driver which is included in the package is similar, please tell me.)

Have you checked the documentation?

https://midas.triumf.ca/MidasWiki/index.php/Slow_Control_System

Basically you have to replace the nulldevice driver with a "real" driver. You find all existing drivers under 
midas/drivers/device. If your favourite is not there, you have to write it. Use one which is close to the one 
you need and modify it.

Best,
Stefan

> I’m beginner of Midas, and trying to develop the slow control front-end with the latest Midas.
> I found the scfe.cxx in the “example”, but not enough to refer to write the front-end for my own devices 
> because it contains only nulldevice and null bus driver case...
> (I could have succeeded to run the HV front-end for ISEG MPod, because there is the device driver...)
> 
> Can I get some frontend examples such as simple TCP/IP and/or RS232 devices?
> Hopefully, I would like to have examples of frontend and device driver.
> (if any device driver which is included in the package is similar, please tell me.)
> 
> Thanks a lot.

Dear Yoshida-san,
my name is Giorgio and I am a Ph.D. student working on the T2K experiment.
I had to write many MIDAS frontends recently, so I think that my code could be of some help to you.

As you might already know, the MIDAS slow control system is structured into three layers/levels.

 - The highest layer is the "class" layer that directly interfaces with the user and the ODB. It is called 
"class" layer because it refers to a class of devices (for example all the high voltage power supplies, 
etc...). The idea is that in the same experiment you can have many different models of power supplies but 
all of them can be controlled with a single class driver.

 - Then there is the "device" layer that implements the functions specific to the particular device.

 - Finally, there is the "BUS" layer that directly communicates with the device. The BUS can be Ethernet 
(TCP/IP), Serial (RS-232 / RS-422 / RS-485), USB, etc ...

You can read more about the MIDAS slow control system here:
https://midas.triumf.ca/MidasWiki/index.php/Slow_Control_System

Anyway, you need to write code for all those layers. If you are lucky you can reuse some of the already 
existing MIDAS code. Keep in mind that all the examples that you find in the MIDAS documentation and the 
MIDAS source code are written in C (even if it is then compiled with g++). But, you can write a frontend in 
C++ without any problem so choose whichever language you are familiar the most with.

I am attaching an archive with some sample code directly taken from our experiment. It is just a small 
fraction of the code not meant to be compilable. The code is disclosed with the GPL3 license, so you can use 
it as you please but if you do, please cite my name and the WAGASCI-T2K experiment somewhere visible.

In the archive, you can find two example frontends with the respective drivers. The "Triggers" frontend is 
written in C++ (or C+ if you consider that the mfe.cxx API is very C-like). The "WaterLevel" frontend is 
written in plain C. The "Triggers" frontend controls our trigger board called CCC and the "WaterLevel" 
frontend controls our water level sensors called PicoLog 1012. They share a custom implementation of the 
TCP/IP bus. Anyway, this is not relevant to you. You may just want to take a look at the code structure.

Finally, recently there have been some very interesting developments regarding the ODB C++ API. I would 
definitely take a look at that. I wish I had that when I was developing these frontends.

Good luck

--
Pintaudi Giorgio, Ph.D. student
Neutrino and Particle Physics Minamino Laboratory
Faculty of Science and Engineering, Yokohama National University
giorgio.pintaudi.kx@ynu.jp
TEL +81(0)45-339-4182