False. Timing trade-offs such as increased latency and lower determinism, along with less communication bandwidth, must also be taken into account before deciding a shared hardware peripheral is acceptable.
All of the above.
False. Stream buffers can be used by a single writer and a single reader. These writers and readers don't need to be the same task. If there are multiple writers or multiple readers, then a synchronization mechanism (such as a mutex) is required.
Mutexes.
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