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INSTITUTE SUPERIOR T CHICO Master in Information Systems and Computer Engineering Second project of the Advanced Programming course Apr 21st 2011 1 Introduction Thread synchronization for shared memory

Therefore, as we have seen, thread pools are one of many methods to implement lock free concurrent programming. This is what makes thread pools so important. Let us look into the different threads in the thread pool and how they are arranged in the pool. As shown in the following picture: T, S and P threads may share a single mute (mute S) between them. This mute can be used by P threads to ensure they are synchronized on all thread data, such as the object they are accessing or the data they are using. T threads, on the other hand, will use the mute to ensure their own access to shared data, such as the array or string they are accessing, and their own synchronization on the mute S with T. We will see that while P threads may access shared data, they are still guaranteed to be thread safe and synchronized. T thread will ensure that they are concurrent, on demand, using some of their time to block. In this way, they will ensure their own access to shared data, the same one they are sharing with P thread. P threads will use the mute to ensure their own access to the shared data, using some of their thread-block time to block. For example, if the current time is T=0, the block must execute for T-1 to synchronize T as other thread blocks. The block will continue until all P threads have been synchronized on the data they're accessing and the block completes without any data being changed. If the current time is T=1, the block must execute to a timeout-based synchronization. Note for those who are new to thread pools: Each thread may have zero or more mutates, each with a different thread ID, which means each thread can have many threads blocked on it. Each thread gets in turn one or more threads (that are still locked) that are not yet blocked on it. The thread with the id t has been blocked on by all threads of the pool, i.e. all its threads are block on it. This thread is now the sole thread belonging to thread pool. Any attempt to access the data the thread has blocked on will block for that thread. This thread is called the master lock in our example. The master lock will only become valid once no more threads have blocked on t.

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