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/* File: omp_hello.c * * Purpose: A parallel hello, world program that uses OpenMP * * Compile: gcc -g -Wall -fopenmp -o omp_hello omp_hello.c * Run: ./omp_hello * * Input: none * Output: A message from each thread * * IPP: Section 5.1 (pp. 211 and ff.) */ #include #include #include void Hello(void); /* Thread function */ /*--------------------------------------------------------------------*/ int main(int argc, char* argv[]) { int thread_count = strtol(argv[1], NULL, 10); # pragma omp parallel num_threads(thread_count) Hello(); return 0; } /* main */ /*------------------------------------------------------------------- * Function: Hello * Purpose: Thread function that prints message */ void Hello(void) { int my_rank = omp_get_thread_num(); int thread_count = omp_get_num_threads(); printf("Hello from thread %d of %d\n", my_rank, thread_count); } /* Hello */