What is the best way to implement multi-threading in C++

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What is the best way to implement multi-threading in C++

Smith, Roland 40

I have a HttpPlatformHandler server written in PowerBuilder. I want to rewrite the main processing part in C++ and then call out to PowerBuilder for the business logic. I have a FastCGI server that does it it that way so I know how that part works.

I'm wondering what is the best way to implement multi-threading in C++ in a HttpPlatformHandler server executable. The main thread doesn't really need to track requests, I just need to launch a thread to handle the current request and (if possible) have the request thread handle cleanup once the PowerBuilder code is done.

Minxin Yu 13,501 Reputation points Microsoft External Staff

2023-12-21T02:20:29.9266667+00:00

For multi-threading, the question is general. You could implement your own thread pool class or use a third-party library. Use two thread pools, one thread pool receives network data and the other processes data. Currently, PowerBuilder is not supported on Q&A. You need to go to PowerBuilder forum for support. Such as https://stackoverflow.com/questions/tagged/powerbuilder

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Minxin Yu 13,501 Reputation points Microsoft External Staff

2023-12-21T02:20:29.9266667+00:00

For multi-threading, the question is general. You could implement your own thread pool class or use a third-party library. Use two thread pools, one thread pool receives network data and the other processes data. Currently, PowerBuilder is not supported on Q&A. You need to go to PowerBuilder forum for support. Such as https://stackoverflow.com/questions/tagged/powerbuilder

Answer 1

Bruce (SqlWork.com) 77,766 Volunteer Moderator

you create an IIS module:

https://learn.microsoft.com/en-us/iis/develop/runtime-extensibility/develop-a-native-cc-module-for-iis

Smith, Roland 40 Reputation points

2023-12-19T18:14:38.4666667+00:00

I'm not sure how this solves my question. Please elaborate.
Bruce (SqlWork.com) 77,766 Reputation points Volunteer Moderator

2023-12-19T18:28:22.9533333+00:00

IIS already allocates a dedicated thread and new instance of the module, by calling your factory, for each request. as this thread will be returned to the thread pool, and reused, you should cleanup at request end. see above link for details.
Smith, Roland 40 Reputation points

2023-12-19T18:41:15.8133333+00:00

If I understand correctly, you think I should write a module that runs the requested PowerBuilder logic and not use the httpPlatformHandler module.
Bruce (SqlWork.com) 77,766 Reputation points Volunteer Moderator

2023-12-19T22:28:14.07+00:00

The platform handler does a reverse proxy to a an application that acts as a webserver. This means you would need to write a webserver in c++. there are frameworks to help with this, but a httpmodule is much simpler.
Smith, Roland 40 Reputation points

2023-12-20T21:06:10.2866667+00:00

I created a module using the sample here:

https://learn.microsoft.com/en-us/iis/web-development-reference/native-code-api-reference/chttpmodule-class
I used appcmd to add the module with the file path to the debug folder. I then added a handler mapping to my module using *.topwiz as the path.

I got 'HTTP Error 503. The service is unavailable.', the app pool stopped, and a bunch of errors got recorded in Event Log. I can no longer browse anything, even static html files. I deleted the handler mapping and used appcmd to remove the module. I edited applicationHost.config and removed the entry from GlobalModules. My IIS is now finally working again.

This is the error from Event Viewer:
The Module DLL C:\Users\RMSMITH\source\repos\TopwizWebModule\Debug\TopwizWebModule.dll failed to load. The data is the error.

Binary data:

In Words

0000: 00000005

In Bytes

0000: 05 00 00 00 ....

Any ideas? I used Depends.exe to verify the RegisterModule function was exported.
Smith, Roland 40 Reputation points

2023-12-20T21:30:52.04+00:00

Recompiled to Release mode and copied to C:\Windows\System32\inetsrv. Same result.
Smith, Roland 40 Reputation points

2023-12-21T16:01:16.2033333+00:00

I figured out my problem. It has to be compiled to 64 bit. I was using the 32 bit version.

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What is the best way to implement multi-threading in C++

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