posix-app

POSIX App — POSIX Compatibility Demo

Demonstrates that standard POSIX APIs work on EoS. Creates pthreads, uses semaphores for synchronization, and passes messages through POSIX message queues — all running on the EoS kernel.

What it demonstrates

• Thread creation with eos_pthread_create() / eos_pthread_join()
• Named semaphores with eos_sem_init() / eos_sem_wait() / eos_sem_post()
• POSIX message queues with eos_mq_open() / eos_mq_send() / eos_mq_receive()
• Sleep with eos_sleep()
• Writing portable code that works on both EoS and standard POSIX systems

Modules used

Module	Header	Functions
POSIX Threads	eos/posix_threads.h	eos_pthread_create, eos_pthread_join
POSIX Sync	eos/posix_sync.h	eos_sem_init, eos_sem_wait, eos_sem_post, eos_sem_destroy
POSIX IPC	eos/posix_ipc.h	eos_mq_open, eos_mq_send, eos_mq_receive, eos_mq_close
POSIX Time	eos/posix_time.h	eos_sleep

How to build

cmake -B build -DEOS_PRODUCT=iot
cmake --build build
./build/posix-app

Expected output

=== EoS POSIX Compatibility Demo ===

[main] Threads created, waiting for completion...

[reader] Started
[writer-1] Started
[writer-2] Started
[writer-1] Sent: msg from thread 1, seq 0
[reader] Received (27 bytes): msg from thread 1, seq 0
[writer-2] Sent: msg from thread 2, seq 0
[reader] Received (27 bytes): msg from thread 2, seq 0
...
[writer-1] Done
[writer-2] Done
[reader] Done

=== POSIX demo complete ===

Why POSIX compatibility?

Many embedded developers come from Linux backgrounds. EoS provides a POSIX compatibility layer so you can:

• Port existing Linux applications to EoS with minimal changes
• Use familiar APIs (pthreads, semaphores, message queues)
• Write code that compiles on both Linux and EoS targets