6. POSIX adjusts to threads
“Who are you?” said the Caterpillar.This was not an encouraging opening for a conversation.Alice replied, rather shyly, “I—I hardly know, Sir, just at present—at least I know who I was when I got up this morning, but I think I must have been changed several times since then.”
—Lewis Carroll, Alice’s Adventures in Wonderland
Pthreads changes the meaning of a number of traditional POSIX process functions. Most of the changes are obvious, and you’d probably expect them even if the standard hadn’t added specific wording. When a thread blocks for I/O, for example, only the calling thread blocks, while other threads in the process can continue to run.
But there’s another class of POSIX functions that doesn’t extend ...
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