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Threads (Multicore Programming (systems putting pressure on programmers,…

- - - - Data parallelism
      - Task parallelism
- - - - generated by particular event
      - delivered to a process
      - handled by one of two signal handlers
        
        user-defined
        
        default
  - - - Deferred cancellation allows the target thread to periodically check if it should be cancelled
      - Asynchronous cancellation terminates the target thread immediately
  - - - Local variables visible only during single function invocation
      - TLS visible across function invocations
- - - - Set of compiler directives
      - Provides support for parallel programming in shared-memory environments
      - Identifies parallel regions – blocks of code that can run in parallel
    - - Extensions to C, C++ languages, API, and run-time library
      - Allows identification of parallel sections
      - Blocks placed in dispatch queue
      - types of dispatch queues
        
        concurrent – removed in FIFO order but several may be removed at a time
        
        serial – blocks removed in FIFO order, queue is per process
    - - Create a number of threads in a pool
      - Advantages
        
        Allows the number of threads in the application(s) to be bound to the size of the pool
        
        Separating task to be performed from mechanics of creating task
        
        Usually slightly faster to service a request with an existing thread