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Free RTOS Reference Manual V9.0.0
Commit: [r1] Commit: [r3]. Also, I"m not sure why you are posting source files that are in the download and available to view in the public SVN repository - unless you changed something in the FreeRTOS code? If you did change something, then that is generally a bad idea, but at least point out where the change is rathe than just post the whole file. It looks like you are using an antique version V7. In that version, the header files still did not have these C-linkage statements:. Could you please first download the latest kernel sources and test with them.
Formal Aspects of Computing. FreeRTOS is an open-source real-time microkernel that has a wide community of users. We present the formal specification of the behaviour of the task part of FreeRTOS that deals with the creation, management, and scheduling of tasks using priority-based preemption. This includes a precise statement of the preconditions for all API commands. This task model forms the basis for three dimensions of further work: a the modelling of the rest of the behaviour of queues, time, mutex, and interrupts in FreeRTOS; b refinement of the models to code to produce a verified implementation; and c extension of the behaviour of FreeRTOS to multi-core architectures.
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FreeRTOS is a real-time operating system kernel    for embedded devices that has been ported to 35 microcontroller platforms. It is distributed under the MIT License. FreeRTOS is designed to be small and simple. The kernel itself consists of only three C files. To make the code readable, easy to port, and maintainable, it is written mostly in C, but there are a few assembly functions included where needed mostly in architecture-specific scheduler routines. FreeRTOS provides methods for multiple threads or tasks , mutexes , semaphores and software timers. A tick-less mode is provided for low power applications.