OSAL (OS Abstraction Layer) is a lightweight, static resource allocation framework designed for Real-Time Operating Systems (RTOS) in embedded systems.
All OS resources are preconfigured within this framework, providing a seamless interface for managing tasks, semaphores, mutexes, timers, and more, all statically defined at initialization.
Under the permissive BSD-2-Clause license, users can freely utilize and distribute the library without licensing complexities.

• Static Resource Definition: Allocate resources at initialization, promoting efficiency and predictability in resource-constrained environments.
• Simple and Lightweight: OSAL offers easily understandable source code and effortless integration into your application..
• POSIX Compatibility: Currently supports POSIX-based systems and designed for easy adaptation to other OS environments.
• High Portability: Flexible design facilitates adaptation to various RTOS and embedded platforms.
• OS components: Supports mutex, semaphore, task, timer and time.

   +-------------------------------+
   |           Application         |
   +-------------------------------+
   +--------------+----------------+
   |       OSAL   |    libc        |
   +--------------+----------------+
   +-------------------------------+
   |        OS User Space APIs     |
   +-------------------------------+
   +-------------------------------+
   |         OS Kernel Space       |
   +-------------------------------+
   +-------------------------------+
   |            HW                 |
   +-------------------------------+

OSAL aims to enhance application code reliability by effectively managing OS resources, ensuring portability across multiple operating systems.

• Build the lib:

$ mkdir build
$ cd build
$ cmake ..
$ make

You can configure OSAL resource limitations via the command line. For detailed information on configuration parameters and how to set them up, please consult the osal_config.cmake file.

• Install the lib:

$ sudo make install # install into `/usr/local/`

• Uninstall the lib:

$ sudo make uninstall # uninstall

The test can be run after the compilation steps above:

$ make check

Please refer to the examples dir for how to use the OSAL APIs.

The examples code can be built as:

$ make examples

To generate the documentation, execute the following command. The output can be located in the build directory.

$ make doc

To run the test code, cmocka is required. Install it on Ubuntu using:

$ sudo apt install libcmocka-dev

The OSAL is tested with the libcmocka 1.1.5-2

This library is licensed under the BSD-2-Clause license. See the LICENSE file for details.

Contributions are welcome! If you find any bugs or have suggestions for improvements, feel free to open an issue or create a pull request.