| /* |
| * parallel-reduction.c -- Archer testcase |
| */ |
| |
| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // |
| // See tools/archer/LICENSE.txt for details. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| |
| // RUN: %libarcher-compile-and-run| FileCheck %s |
| // REQUIRES: tsan |
| #include <omp.h> |
| #include <stdio.h> |
| |
| int main(int argc, char *argv[]) { |
| int var = 0; |
| |
| // Number of threads is empirical: We need enough threads so that |
| // the reduction is really performed hierarchically in the barrier! |
| #pragma omp parallel num_threads(5) reduction(+ : var) |
| { var = 1; } |
| |
| fprintf(stderr, "DONE\n"); |
| int error = (var != 5); |
| return error; |
| } |
| |
| // CHECK-NOT: ThreadSanitizer: data race |
| // CHECK-NOT: ThreadSanitizer: reported |
| // CHECK: DONE |
