Is there a single, commonly accepted, macro to test if FreeRTOS is in use? i.e. the equivalent of _WIN32 etc? _FREERTOS is what I'd be after ...?

Thx.

Such definitions are set up by the build environment, not by the code.

You can test to see if FreeRTOS headers have been included in a source file, but presumably you can see that anyway. If headers are included in a source file, but only conditionally (for example, if they are in a #if block), then you would have to test whatever condition the #if is testing.

If you want to know if FreeRTOS has been included in a source file you can test for INC_FREERTOS_H. If task.h is included, then you also test for tskKERNEL_VERSION_NUMBER.

Regards.