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In my code, I want to avoid throwing exceptions from inside any openMP parallel region (because this results in an unhandled exception if not caught within the same region). To this end, I tried to use the openmp run-time library function omp_in_parallel(); to decide whether to throw an exception or write out an error message and terminate. However, under gcc 4.7.0 this will not work if there is only one thread to a parallel region: #include <iostream> #include <omp.h> void do_something() { if(!omp_in_parallel()) // omp_in_parallel() returns false! throw 3; // so should be able to safely throw } int main() { omp_set_num_threads(1); try { # pragma omp parallel do_something(); } catch(int e) { std::cerr<<"error: '"<<e<<"'\n"; // never gets here } } does not result in error: '3' but in terminate called after throwing an instance of 'int' Abort . Is this the correct behaviour (of omp_in_parallel() )? (the openMP standard appears sufficiently vague) or a bug in gcc? How can I fix the above code for do_something() so that it throws only when not in a parallel region?

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