graceful shutdown of services / eas
EAs that are properly coded to be event driven and not use eternal loops, will close properly.
For loops that might take longer, then the EA should check IsStopped or _StopFlag on every iteration and promptly return and exit.
DLLs should be coded to be event driven as well and not be stuck in long processing cycles.
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Please consider which section is most appropriate — https://www.mql5.com/en/forum/172166/page6#comment_49114893
EAs that are properly coded to be event driven and not use eternal loops, will close properly.
For loops that might take longer, then the EA should check IsStopped or _StopFlag on every iteration and promptly return and exit.
DLLs should be coded to be event driven as well and not be stuck in long processing cycles.
Thank you seems straightforward . Btw. the error type is of Hang type: Cross-thread
EAs that are properly coded to be event driven and not use eternal loops, will close properly.
For loops that might take longer, then the EA should check IsStopped or _StopFlag on every iteration and promptly return and exit.
DLLs should be coded to be event driven as well and not be stuck in long processing cycles.
Sorry for double post making sure you get the notification.
Returns true, if the _StopFlag system variable contains a value other than 0. A nonzero value is written into _StopFlag, if a mql5 program has been commanded to complete its operation. In this case, you must immediately terminate the program, otherwise the program will be completed forcibly from the outside after 3 seconds.
Forcibly completed is not clear here for me. If my program is stuck shouldn't the thread be killed in a manner that does not freeze my terminal?
Regards
The flag refers to MQL programs and indicates that it has been requested to stop, and the program is given 3 seconds to do a clean-up before they are forcefully closed.
As for the DLLs, it is up to the MQL program to handle them, and hopefully the DLLs were coded in a way that allows them to be interrupted and not be stuck in a loop. In other words, they should work asynchronously and not block.
The flag refers to MQL programs and indicates that it has been requested to stop, and the program is given 3 seconds to do a clean-up before they are forcefully closed.
As for the DLLs, it is up to the MQL program to handle them, and hopefully the DLLs were coded in a way that allows them to be interrupted and not be stuck in a loop. In other words, they should work asynchronously and not block.
Thanks again!
To be honest I cannot find much information about DLL resolving order, caveats tricks etc. For example some of my libraries have no problem to be found by MQL5 in the Editor but when ran from the terminal they cannot be found. It mostly happens when they have 3rd party DLL dependency. Even that the dependency can be loaded from MQL5 it still cannot be found by the terminal. I had to use process monitor to find a path where terminal is looking for the DLLS. It is looking in the main folder of the terminal.exe for example: Even that the dependency DLL can be loaded from MQL5 and is included in Libraries folder. Sorry for being a little chaotic it's time for me.
The best place to place DLL dependencies for your DLLS that are imported in MQL5 is to place them in the terminal root folder ( i hope i didn't miss any documentation stating that clearly hahaha )
19:16:16.0298404 terminal64.exe 29504 RegQueryKey HKLM\SOFTWARE\Microsoft\Fusion\PublisherPolicy\Default SUCCESS Query: HandleTags, HandleTags: 0x100 19:16:16.0298582 terminal64.exe 29504 RegOpenKey HKLM\SOFTWARE\Microsoft\Fusion\PublisherPolicy\Default\v4.0_policy.8.0.MyLibrary__b03f5f7f11d50a3a NAME NOT FOUND Desired Access: Read 19:16:16.0298740 terminal64.exe 29504 RegQueryKey HKLM\SOFTWARE\Microsoft\Fusion\PublisherPolicy\Default BUFFER TOO SMALL Query: Name, Length: 0 19:16:16.0298873 terminal64.exe 29504 RegQueryKey HKLM\SOFTWARE\Microsoft\Fusion\PublisherPolicy\Default SUCCESS Query: Name 19:16:16.0299025 terminal64.exe 29504 RegOpenKey HKLM\SOFTWARE\Microsoft\AppModel\Lookaside\machine\SOFTWARE\Microsoft\Fusion\PublisherPolicy\Default\v4.0_policy.8.0.MyLibrary__b03f5f7f11d50a3a NAME NOT FOUND Desired Access: Read 19:16:16.0299197 terminal64.exe 29504 RegQueryKey HKLM\SOFTWARE\Microsoft\Fusion\PublisherPolicy\Default SUCCESS Query: HandleTags, HandleTags: 0x100 19:16:16.0299295 terminal64.exe 29504 RegOpenKey HKLM\SOFTWARE\Microsoft\Fusion\PublisherPolicy\Default\policy.8.0.MyLibrary__b03f5f7f11d50a3a NAME NOT FOUND Desired Access: Read 19:16:16.0299400 terminal64.exe 29504 RegQueryKey HKLM\SOFTWARE\Microsoft\Fusion\PublisherPolicy\Default BUFFER TOO SMALL Query: Name, Length: 0 19:16:16.0299497 terminal64.exe 29504 RegQueryKey HKLM\SOFTWARE\Microsoft\Fusion\PublisherPolicy\Default SUCCESS Query: Name 19:16:16.0299615 terminal64.exe 29504 RegOpenKey HKLM\SOFTWARE\Microsoft\AppModel\Lookaside\machine\SOFTWARE\Microsoft\Fusion\PublisherPolicy\Default\policy.8.0.MyLibrary__b03f5f7f11d50a3a NAME NOT FOUND Desired Access: Read 19:16:16.0300490 terminal64.exe 29504 FASTIO_NETWORK_QUERY_OPEN C:\Windows\Microsoft.Net\assembly\GAC_64\MyLibrary\v4.0_8.0.0.0__b03f5f7f11d50a3a\MyLibrary.dll FAST IO DISALLOWED 19:16:16.0300860 terminal64.exe 29504 IRP_MJ_CREATE C:\Windows\Microsoft.Net\assembly\GAC_64\MyLibrary\v4.0_8.0.0.0__b03f5f7f11d50a3a\MyLibrary.dll PATH NOT FOUND Desired Access: Read Attributes, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 19:16:16.0301469 terminal64.exe 29504 FASTIO_NETWORK_QUERY_OPEN C:\Windows\Microsoft.Net\assembly\GAC_MSIL\MyLibrary\v4.0_8.0.0.0__b03f5f7f11d50a3a\MyLibrary.dll FAST IO DISALLOWED 19:16:16.0301919 terminal64.exe 29504 IRP_MJ_CREATE C:\Windows\Microsoft.Net\assembly\GAC_MSIL\MyLibrary\v4.0_8.0.0.0__b03f5f7f11d50a3a\MyLibrary.dll PATH NOT FOUND Desired Access: Read Attributes, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 19:16:16.0302483 terminal64.exe 29504 FASTIO_NETWORK_QUERY_OPEN C:\Windows\Microsoft.Net\assembly\GAC\MyLibrary\v4.0_8.0.0.0__b03f5f7f11d50a3a\MyLibrary.dll FAST IO DISALLOWED 19:16:16.0302813 terminal64.exe 29504 IRP_MJ_CREATE C:\Windows\Microsoft.Net\assembly\GAC\MyLibrary\v4.0_8.0.0.0__b03f5f7f11d50a3a\MyLibrary.dll PATH NOT FOUND Desired Access: Read Attributes, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 19:16:16.0303375 terminal64.exe 29504 FASTIO_NETWORK_QUERY_OPEN C:\Windows\assembly\GAC_64\MyLibrary\8.0.0.0__b03f5f7f11d50a3a\MyLibrary.dll FAST IO DISALLOWED 19:16:16.0303706 terminal64.exe 29504 IRP_MJ_CREATE C:\Windows\assembly\GAC_64\MyLibrary\8.0.0.0__b03f5f7f11d50a3a\MyLibrary.dll PATH NOT FOUND Desired Access: Read Attributes, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 19:16:16.0304259 terminal64.exe 29504 FASTIO_NETWORK_QUERY_OPEN C:\Windows\assembly\GAC_MSIL\MyLibrary\8.0.0.0__b03f5f7f11d50a3a\MyLibrary.dll FAST IO DISALLOWED 19:16:16.0304603 terminal64.exe 29504 IRP_MJ_CREATE C:\Windows\assembly\GAC_MSIL\MyLibrary\8.0.0.0__b03f5f7f11d50a3a\MyLibrary.dll PATH NOT FOUND Desired Access: Read Attributes, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 19:16:16.0305151 terminal64.exe 29504 FASTIO_NETWORK_QUERY_OPEN C:\Windows\assembly\GAC\MyLibrary\8.0.0.0__b03f5f7f11d50a3a\MyLibrary.dll FAST IO DISALLOWED 19:16:16.0305481 terminal64.exe 29504 IRP_MJ_CREATE C:\Windows\assembly\GAC\MyLibrary\8.0.0.0__b03f5f7f11d50a3a\MyLibrary.dll PATH NOT FOUND Desired Access: Read Attributes, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 19:16:16.0307378 terminal64.exe 29504 FASTIO_NETWORK_QUERY_OPEN C:\Users\myuser\Documents\MetaTrader 5\MyLibrary.dll FAST IO DISALLOWED 19:16:16.0307742 terminal64.exe 29504 IRP_MJ_CREATE C:\Users\myuser\Documents\MetaTrader 5\MyLibrary.dll NAME NOT FOUND Desired Access: Read Attributes, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 19:16:16.0308260 terminal64.exe 29504 FASTIO_NETWORK_QUERY_OPEN C:\Users\myuser\Documents\MetaTrader 5\MyLibrary\MyLibrary.dll FAST IO DISALLOWED 19:16:16.0308535 terminal64.exe 29504 IRP_MJ_CREATE C:\Users\myuser\Documents\MetaTrader 5\MyLibrary\MyLibrary.dll PATH NOT FOUND Desired Access: Read Attributes, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 19:16:16.0309112 terminal64.exe 29504 FASTIO_NETWORK_QUERY_OPEN C:\Users\myuser\Documents\MetaTrader 5\MyLibrary.exe FAST IO DISALLOWED 19:16:16.0309481 terminal64.exe 29504 IRP_MJ_CREATE C:\Users\myuser\Documents\MetaTrader 5\MyLibrary.exe NAME NOT FOUND Desired Access: Read Attributes, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 19:16:16.0309974 terminal64.exe 29504 FASTIO_NETWORK_QUERY_OPEN C:\Users\myuser\Documents\MetaTrader 5\MyLibrary\MyLibrary.exe FAST IO DISALLOWED 19:16:16.0310248 terminal64.exe 29504 IRP_MJ_CREATE C:\Users\myuser\Documents\MetaTrader 5\MyLibrary\MyLibrary.exe PATH NOT FOUND Desired Access: Read Attributes, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a
In truth, DLL programming is beyond the scope of this forum, because DLL programming belongs in the realm of general Windows programming, not MQL5/MetaTrader. It is an advanced programming skill requirement.
The only part that is within scope, is how MQL5 declares the use of DLLs, and calls the exported functions from those DLLs (and how parameters are passed).
The rest is then needs to be addressed by knowledge and skills obtained from other sources.
In truth, DLL programming is beyond the scope of this forum, because DLL programming belongs in the realm of general Windows programming, not MQL5/MetaTrader. It is an advanced programming skill requirement.
The only part that is within scope, is how MQL5 declares the use of DLLs, and calls the exported functions from those DLLs (and how parameters are passed).
The rest is then needs to be addressed by knowledge and skills obtained from other sources.
Understood.
In truth, DLL programming is beyond the scope of this forum, because DLL programming belongs in the realm of general Windows programming, not MQL5/MetaTrader. It is an advanced programming skill requirement.
The only part that is within scope, is how MQL5 declares the use of DLLs, and calls the exported functions from those DLLs (and how parameters are passed).
The rest is then needs to be addressed by knowledge and skills obtained from other sources.
There's more on the topic in docs here:
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Are there any concepts of graceful shutdown, like a function in the .mq5 script that can handle this?