.. _02-task:

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Small task #2 and #2+
=====================

Write a program that uses threads without the help of the thread library (raw syscalls).

The program should:

1. Create a new thread in the same address space -- allocate the stack for the new thread, use syscall ``clone`` to run the code.
2. In the new thread: write 1000 times ``"A\n"`` to the standard output (using syscall ``write``), and then end the thread (syscall ``exit``).
3. In the main thread: write 1000 times ``"B\n"`` to the standard output (using syscall ``write``), wait for the new thread to finish (``waitpid``)
   and then end the program (syscall ``exit_group``).

The task can be done in two versions:

- #2 (easy, worth 1 point): using the ``clone``, ``syscall`` functions from libc.
- #2+ (difficult, worth 2 points): not using any library functions, calling syscalls from assembly language.