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Programming with POSIX threads David R. Butenhof
Publisher: Addison-Wesley Professional

It's 100% free, no registration required. For UNIX systems, a standardized C language threads programming interface has been specified by the IEEE POSIX 1003.1c standard. Here's a simple C program that demonstrates the use of the pthreads library for multicore programming. First, let's import some necessary headers, mainly pthread.h which provides the POSIX threads implementation. They are also generally hard to get right. You should read it at least until “Starting a process” part, and if you're not afraid of C and want to know more about low-level workings of threads, POSIX system calls etc – keep reading until the end. To learn the fundamentals on POSIX Threads Programming, I will recommend you to go to following links. Threads are very useful but potentially very tricky constructs in computer programming. To support POSIX Threads Programming: https://computing.llnl.gov/tutorials/pthreads/. I have found that it is supposed to be IEEE 1003.1c "EEE Standard for Information Technology--Portable Operating System Interface (POSIX(R)) - System Application Program Interface (API) Amendment 2: Threads Extension (C Language)". It was primarily created to support Java development but was later extended to support other programming languages. A C++ Thread Pool Implementation Using POSIX Threads. Stack Overflow is a question and answer site for professional and enthusiast programmers. Implementations that adhere to this standard are referred to as POSIX threads, or Pthreads.