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How to do sum of array using pthreads?
Sum of an array using pthreads. Sum of array is a small problem where we have to add each element in the array by traversing through the entire array. But when the number of elements are too large, it could take a lot of time. But this could solved by dividing the array into parts and finding sum of each part simultaneously i.e.
Is it better to use one thread for each sum?
In our case, each core will evaluate sum of one portion and finally we will add the sum of all the portion to get the final sum. In this way we could improve the performance of a program as well as utilize the cores of processor. It is better to use one thread for each core.
How are condition variables used in multi-threaded programming?
A condition variable is a mechanism that allows threads to wait (without wasting CPU cycles) for some even to occur. Several threads may wait on a condition variable, until some other thread signals this condition variable (thus sending a notification).
What are the problems of running multiple threads?
One of the basic problems when running several threads that use the same memory space, is making sure they don’t “step on each other’s toes”. By this we refer to the problem of using a data structure from two different threads. For instance, consider the case where two threads try to update two variables.
How to do a sum of an array?
This could be done by using multi-threading where each core of the processor is used. In our case, each core will evaluate sum of one portion and finally we will add the sum of all the portion to get the final sum. In this way we could improve the performance of a program as well as utilize the cores of processor.
Do you pass Global as argument to sum _ thread ( )?
You can simply pass that and use the same inside your thread function. However, just to mention a logical point, if you’re passing global as a parameter to sum_thread () function, it need not be a global. You pass (void*)&global as the thread start function’s argument.