using pthreads

[mzimmers]

Hi -

From https://docs.espressif.com/projects/esp ... hread.html:

This module offers Espressif specific extensions to the pthread library

But where is the actual pthread library itself?

Thanks.

[ESP_Sprite]

I assume the documentation means 'the pthread api' rather than an actual library. The esp-idf functions implementing pthread functionality are here.

[mzimmers]

Thanks, Sprite. I'm very new to CMake, so I'm sure I'm doing something wrong, but when I include this line:

Code: Select all

find_package(Threads REQUIRED PATHS C:/esp-idf/components/pthread)

I get this error message:

CMake Error at CMakeLists.txt:148 (find_package):
Could not find a package configuration file provided by "Threads" with any
of the following names:

ThreadsConfig.cmake
threads-config.cmake

And indeed, those files don't seem to exist. Any idea what I'm doing wrong?

Thanks.

[ESP_Sprite]

Well, it's not a package, it's a component. I'm far from an expert on CMake, but from what I understand you would add it like this:

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idf_component_register(...
                       REQUIRES pthread)
                       

as described here

[mzimmers]

As I understand it, a component is an ESP-IDF concept, while a package is a CMake concept, right? So, I need some way of translating one into another.

Ideally, I could build this without having to modify the source of bctoolbox, but I don't know whether that's possible.

[markkuk]

ESP-IDF components are CMake libraries, not packages. https://docs.espressif.com/projects/esp ... components
Using pthreads should work just by including <pthread.h> in your source and calling the functions without changes in CMakeLists. At least it works like that from the main component (file containing app_main()):

[mzimmers]

If that's true, then the build should work as-is, right? But it's not...it's generating the error(s) I reported below.

I guess I'm missing something here.

[boarchuz]

What's your current CMakeLists.txt?

[mzimmers]

This is the file from github:

https://github.com/BelledonneCommunicat ... eLists.txt

I added this line:

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+include($ENV{IDF_PATH}/tools/cmake/project.cmake)

And changed this line:

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-find_package(Threads REQUIRED)
+find_package(Threads REQUIRED PATHS C:/esp-idf/components/pthread)

There are a few other tweaks, but I don't think they're relevant.

Thanks for looking at this.