Talk:BlackBerry Tablet OS

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Renamed?

After checking numerous primary and secondary sources, I have yet to find an explicit announcement that RIM renamed BlackBerry Tablet OS to BlackBerry PlayBook OS. If someone can provide a reliable source that explains the relationship between the two products (fork, rename, different UI, etc.), let's document it in the article. – Ringbang (talk) 02:54, 23 February 2012 (UTC)[reply]

Wasn't this line killed

Shouldn't this article be in the past tense? I thought they killed the tablet line. CaribDigita (talk) 19:05, 8 October 2015 (UTC)[reply]

Multitasking

Hard real time allocation: The micro-kernel architecture operating system provides hard real-time multitasking. QNX was one of the first POSIX operating systems to employ the technique of hard time allocation on a fixed clock cycle. The kernel will visit each and every task at least once every cycle, for instance every 20 milliseconds (or 50 frames per second, in graphics terms), to be sure that no task is not attended (or no object entirely unrendered, in graphics terms). This model achieves most of the advantages of the interrupt-driven and polling approaches to multi-tasking. QNX Neutrino kernel calls support threads, message passing, signals, clocks, timers, interrupt handlers, semaphores, mutual exclusion locks (mutexes), condition variables (condvars) and barriers. The kernel is built on these only, making QNX "fully preemptible, even while passing messages between processes; it resumes the message pass where it left off before preemption." This alleviates problems of sudden power-outs or user actions that force resources to be swapped out of working memory – common in tablet applications.^[1]

Bound multiprocessing: The micro-kernel was designed for distributed processing, which reduces heat and energy usage by comparison to monolithic architectures such as Linux. The ability to lock software tasks to specific cores, under the control of a single copy of the OS, lets all resources be "dynamically allocated and shared among applications. During application initialization, however, a setting determined by the system designer forces all of an application’s threads to execute only on a specified core" thus reducing inter-processor communications overhead and keeping the bus clear.^[2] This approach lies between symmetric multiprocessing and asymmetric multiprocessing.

Note: this seems excessive intricate detail. K.e.coffman (talk) 04:01, 17 October 2016 (UTC)[reply]

References

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[1] ttp://www.qnx.com/developers/docs/6.3.2/neutrino/sys_arch/kernel.html

[2] Making the Most of Multi-Core Processors: Part 1

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[2]