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