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Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
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Q: What is join with respect to Pthreads? A: Join is a functionality of Pthread library which allows the originating thread to wait for the completion of all its spawned thread's tasks.
Without join the originating thread would exit as soon as it completes its chores, completely ignoring the states of its spawned threads. Due to this, even if any of the spawned threads is in middle of its chore, it'll simply get aborted.
Underlying operating system may schedule the threads on the basis of some algorithm which works on time limit (threads may be allowed to run only for certain durations of time, thus preventing the other threads from starvation), priority (higher priority threads may interrupt the lower priority threads during their execution), or some other factor.
These factors may cause a thread to sleep before it completes its task fully. Another thread may get scheduled meanwhile...