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## midterm_studyGuide.md

      
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                shawnkoon
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                CSCD467 midterm study guide
              
          
    CSCD467 Parallel & Cloud Computing
Midterm Study guide.
Author : shawnkoon.
Web : github.com/shawnkoon

Concept of barrier and semaphore


Barrier - Datastructure that allows threads to wait for each other to reach a same barrier point. CyclicBarrier - barrier that is re-used after the threads are released.


Semaphore - Datastructure that maintains a set of permits and it ensures that only N threads can access a certain resource at a given time. Tip : Why getItem() method is not synchronized? A : because semaphore encapsulates the synchronization inside itself.