Many current language specifications, such as for C and C++, are inadequate for multithreaded programs. This can have an impact on compilers and the correctness of code, as this problem illustrates. Consider the following declarations and function definition: int global positives = 0; typedef struct list { struct list *next; double val; } * list; void count_positives (list 1) { list p; for (p = 1; p; p = p->next) if (p -> val > 0.0) ++global positives; } Now consider the case in which thread A performs count_positives (); while thread B performs ++global_positives; a. What does the function do? b. The C language only addresses single-threaded execution. Does the use of two parallel threads create any problems or potential problems?

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