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Introduction
Portable: μC/OS-III can be ported to a large number of CPU architectures. Most μC/OS-II ports
are easily converted to work on μC/OS-III with minimal changes in just a matter of minutes and
therefore benefit from more than 45 CPU architectures already supported by μC/OS-II.
ROMable: μC/OS-III was designed especially for embedded systems and can be ROMed
along with the application code.
Run-time configurable: μC/OS-III allows the user to configure the kernel at run time.
Specifically, all kernel objects such as tasks, stacks, semaphores, event-flag groups, message
queues, number of messages, mutual exclusion semaphores, memory partitions and timers, are
allocated by the user at run time. This prevents over-allocating resources at compile time.
Unlimited number of tasks: μC/OS-III supports an unlimited number of tasks. From a
practical standpoint, however, the number of tasks is actually limited by the amount of
memory (both code and data space) that the processor has access to. Each task requires its
own stack space and, μC/OS-III provides features to allow stack growth of the tasks to be
monitored at run-time.
μC/OS-III does not impose any limitations on the size of each task, except that there be a
minimum size based on the CPU used.
Unlimited number of priorities: μC/OS-III supports an unlimited number of priority
levels. However, configuring μC/OS-III for between 32 and 256 different priority levels is
more than adequate for most applications.
Unlimited number of kernel objects: μC/OS-III allows for any number of tasks,
semaphores, mutual exclusion semaphores, event flags, message queues, timers, and
memory partitions. The user at run-time allocates all kernel objects.
Services: μC/OS-III provides all the services expected from a high-end real-time kernel,
such as task management, time management, semaphores, event flags, mutexes, message
queues, software timers, fixed-size memory pools, etc.
Mutual Exclusion Semaphores (Mutexes): Mutexes are provided for resource
management. Mutexes are special types of semaphores that have built-in priority
inheritance, which eliminate unbounded priority inversions. Accesses to a mutex can be
nested and therefore, a task can acquire the same mutex up to 250 times. Of course, the
mutex owner needs to release the mutex an equal number of times.
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