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Introduction
Can easily be optimized: μC/OS-III was designed so that it could easily be optimized
based on the CPU architecture. Most data types used in μC/OS-III can be changed to make
better use of the CPU’s natural word size. Also, the priority resolution algorithm can easily
be written in assembly language to benefit from special instructions such as bit set and
clear, as well as count-leading-zeros (CLZ), or find-first-one (FF1) instructions.
Deadlock prevention: All of the μC/OS-III “pend” services include timeouts, which help
avoid deadlocks.
Tick handling at task level: The clock tick manager in μC/OS-III is accomplished by a
task that receives a trigger from an ISR. Handling delays and timeouts by a task greatly
reduces interrupt latency. Also, μC/OS-III uses a hashed delta list mechanism, which further
reduces the amount of overhead in processing delays and timeouts of tasks.
User definable hooks: μC/OS-III allows the port and application programmer to define
“hook” functions, which are called by μC/OS-III. A hook is simply a defined function that
allows the user to extend the functionality of μC/OS-III. One such hook is called during a
context switch, another when a task is created, yet another when a task is deleted, etc.
Timestamps: For time measurements, μC/OS-III requires that a 16-bit or 32-bit free running
counter be made available. This counter can be read at run time to make time
measurements of certain events. For example, when an ISR posts a message to a task, the
timestamp counter is automatically read and saved as part of the message posted. When the
recipient receives the message, the timestamp is provided to the recipient, and by reading
the current timestamp, the time it took for the message to be received can be determined.
Built-in support for Kernel Awareness debuggers: This feature allows kernel
awareness debuggers to examine and display μC/OS-III variables and data structures in a
user-friendly way, but only when the debugger hits a breakpoint. Instead of a static view of
the environment the kernel awareness support in μC/OS-III is also used by μC/Probe to
display the same information at run-time.
Object names: Each μC/OS-III kernel object can have a name associated with it. This
makes it easy to recognize what the object is assigned to. Assign an ASCII name to a task, a
semaphore, a mutex, an event flag group, a message queue, a memory partition, and a
timer. The object name can have any length, but must be NUL terminated.
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