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6ccdf47f60
With Zephyr now always using `int main(void)`, there's no longer any need for this definition. The last remaining use which gated the declaration of _posix_zephyr_main isn't necessary as adding that declaration unconditionally is harmless. Signed-off-by: Keith Packard <keithp@keithp.com>
.. _cpp_synchronization:
C++ Synchronization
###################
Overview
********
The sample project illustrates usage of pure virtual class, member
functions with different types of arguments, global objects constructor
invocation.
A simple application demonstrates basic sanity of the kernel. The main thread
and a cooperative thread take turns printing a greeting message to the console,
and use timers and semaphores to control the rate at which messages are
generated. This demonstrates that kernel scheduling, communication, and
timing are operating correctly.
Building and Running
********************
This kernel project outputs to the console. It can be built and executed
on QEMU as follows:
.. zephyr-app-commands::
:zephyr-app: samples/cpp_synchronization
:host-os: unix
:board: qemu_x86
:goals: run
:compact:
Sample Output
=============
.. code-block:: console
Create semaphore 0x001042b0
Create semaphore 0x001042c4
main: Hello World!
coop_thread_entry: Hello World!
main: Hello World!
coop_thread_entry: Hello World!
main: Hello World!
coop_thread_entry: Hello World!
main: Hello World!
coop_thread_entry: Hello World!
main: Hello World!
coop_thread_entry: Hello World!
main: Hello World!
coop_thread_entry: Hello World!
main: Hello World!
coop_thread_entry: Hello World!
main: Hello World!
coop_thread_entry: Hello World!
main: Hello World!
coop_thread_entry: Hello World!
main: Hello World!
<repeats endlessly>
Exit QEMU by pressing :kbd:`CTRL+A` :kbd:`x`.