Intertask Communication and Resource Sharing
Multitasking systems must manage sharing data and hardware resources among multiple tasks. It is usually "unsafe" for two tasks to access the same specific data or hardware resource simultaneously. "Unsafe" means the results are inconsistent or unpredictable. There are three common approaches to resolve this problem:
Read more about this topic: Real-time Operating System
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—Henry David Thoreau (1817–1862)