In the “hello, world” program, the variables used by each thread ( my_rank and thread_count) were declared in the Hello function, which is called inside the parallel block. A variable that can be accessed by all the threads in the team has shared scope, while a variable that can only be accessed by a single thread has private scope. ![]() In OpenMP, the scope of a variable refers to the set of threads that can access the variable in a parallel block. c file but outside any function has “file-wide” scope, that is, any function in the file in which the variable is declared can access the variable. On the other hand, a variable declared at the beginning of a. For example, a variable declared at the beginning of a C function has “function-wide” scope, that is, it can only be accessed in the body of the function. In serial programming, the scope of a variable consists of those parts of a program in which the variable can be used. ![]() Pacheco, in An Introduction to Parallel Programming, 2011 5.3 Scope of Variables
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