Which of the following statement is correct for Pthreads?

1. AIt refers to POSIX standard (IEEE 1002.1c)
2. BThis standard defines API for thread creation only
3. CThis is a specification only for thread behavior and not its implementation
4. DOperating systems like Solaris, Linux Mac OS X, except Tru64 UNIX, implement Pthreads

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Correct answer: C. This is a specification only for thread behavior and not its implementation

Explanation

Pthreads is the POSIX standard IEEE 1003.1c (not 1002.1c). It defines an API for thread creation and synchronization, and it is a specification of behaviour, not an implementation. Tru64 UNIX also implements it.