Multicore ... Espressif did Arduino "right" on the ESP32 IMHO as they integrated FreeRTOS in the Arduino implementation.
RF+Housekeeping+IDF on core_0 and Arduino on core_1 by default.
Right now, as I count things, there are various ways to program the RP2040:
- rPi's toolset: C/C++
- MBED Arduino MBED
- Arduino core 3rd party Earle's core
- CircuitPython
- MicroPython
MBED, Earle's core, and microPython have some multicore functionality; MBED is likely the more sophisticated at this time, IMO.
However, with Earle's core, and an example is provided for multicore and it worked for me. The unfortunate issue IMO is that the programmer is responsible for managing resource contentions.
Ray