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Threads in RIOT are functions with signature

void *thread_handler(void *arg);

Use thread_create() from thread.h to start it

thread_create(stack, sizeof(stack),
                    THREAD_PRIORITY_MAIN - 1,
                    THREAD_CREATE_STACKTEST,
                    thread_handler,
                    NULL, "thread");

thread_create returns a kernel_pid_t type, which can be helpful to assign to a variable (but not necessary for this lesson).

• Start the thread "thread" from within main()
• Run the application on native: make all term
• Check your output, it should read: I'm in "thread" now

Read the doc

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