Thread handle set too late in pthread_create() [FreeRTOS]

On FreeRTOS, when calling pthread_create(), the first argument is a pointer to the thread handle. Before the new thread starts running, it must store the new pthread handle in this location. However, the scheduler is started before the handle is stored. This causes the calling thread to be preempted (the thread which called pthread_create()), and the new thread starts running. If the new thread references the thread handle, it will be uninitialized.