Change Note 2025-08-02

Kernel-v3

• Various API changes to the kernel modules.
• Each module implementing shared data (such as queues) now handles protection for each procedure call. Before, some protection was provided by the kernel procedures.
• Move functionality to run the ready queue to the kernel module.

Kernel-v3t

• While kernel-v3 disables interrupts to protect shared data, a new variant kernel-v3t uses a trap handler for the same purpose.
• A new module SysCall implements the trap functionality.
• Otherwise unchanged to kernel-v3.

Status

• Both kernel-v3 variants are experimental.
• See Description.

Config Files

• Add kernel-v3t config for Pico2.

Example Programs

• K3base: basic test program for kernel-v3.
• K3tbase: same basic test program for kernel-v3t.