36 lines · c
1/*2 * parallel-reduction.c -- Archer testcase3 */4 5//===----------------------------------------------------------------------===//6//7// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.8//9// See tools/archer/LICENSE.txt for details.10// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception11//12//===----------------------------------------------------------------------===//13 14 15// RUN: %libarcher-compile-and-run| FileCheck %s16// REQUIRES: tsan17#include <omp.h>18#include <stdio.h>19 20int main(int argc, char *argv[]) {21 int var = 0;22 23// Number of threads is empirical: We need enough threads so that24// the reduction is really performed hierarchically in the barrier!25#pragma omp parallel num_threads(5) reduction(+ : var)26 { var = 1; }27 28 fprintf(stderr, "DONE\n");29 int error = (var != 5);30 return error;31}32 33// CHECK-NOT: ThreadSanitizer: data race34// CHECK-NOT: ThreadSanitizer: reported35// CHECK: DONE36