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Asynchronous Android by Steve Liles

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Understanding the Android thread model

Each forked application process runs independently and is scheduled frequent, small amounts of CPU time by the operating system. This time-slicing approach means that even a single-processor device can appear to be actively working in more than one application at the same time, when in fact, each application is taking very short turns on the CPU.

Within a process, there may be many threads of execution. Each thread is a separate sequential flow of control within the overall program—it executes its instructions in order, one after the other. These threads are also allocated slices of CPU time by the operating system.

While the application process is started by the system and prevented from directly interfering ...

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