[multithreading] What is a "thread" (really)?

Unfortunately, threads do exist. A thread is something tangible. You can kill one, and the others will still be running. You can spawn new threads.... although each thread is not it's own process, they are running separately inside the process. On multi-core machines, 2 threads could run at the same time.

http://en.wikipedia.org/wiki/Simultaneous_multithreading

http://www.intel.com/intelpress/samples/mcp_samplech01.pdf

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