openmp/tools/archer/tests/races/task-dependency.c

   1 /*
   2  * task-dependency.c -- Archer testcase
   3  */
   4 //===----------------------------------------------------------------------===//
   5 //
   6 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   7 //
   8 // See tools/archer/LICENSE.txt for details.
   9 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 // RUN: %libarcher-compile-and-run-race | FileCheck %s
  14 // RUN: %libarcher-compile-and-run-race-noserial | FileCheck %s
  15 // REQUIRES: tsan
  16 #include "ompt/ompt-signal.h"
  17 #include <omp.h>
  18 #include <stdio.h>
  19 #include <unistd.h>
  20
  21 int main(int argc, char *argv[]) {
  22   int var = 0, a = 0, b = 0;
  23
  24 #pragma omp parallel num_threads(8) shared(var, a)
  25 #pragma omp master
  26   {
  27 #pragma omp task shared(var, a, b) depend(out : var)
  28     {
  29       OMPT_SIGNAL(a);
  30       var++;
  31       OMPT_SIGNAL(b);
  32     }
  33
  34 #pragma omp task shared(a) depend(in : var)
  35     {
  36       OMPT_SIGNAL(a);
  37       OMPT_WAIT(a, 3);
  38     }
  39
  40 #pragma omp task shared(var, b) // depend(in: var) is missing here!
  41     {
  42       OMPT_WAIT(b, 1);
  43       var++;
  44       OMPT_SIGNAL(a);
  45     }
  46
  47     // Give other thread time to steal the task.
  48     OMPT_WAIT(a, 2);
  49   }
  50
  51   int error = (var != 2);
  52   fprintf(stderr, "DONE\n");
  53   return error;
  54 }
  55
  56 // CHECK: WARNING: ThreadSanitizer: data race
  57 // CHECK-NEXT:   {{(Write|Read)}} of size 4
  58 // CHECK-NEXT: #0 {{.*}}task-dependency.c:43
  59 // CHECK:   Previous write of size 4
  60 // CHECK-NEXT: #0 {{.*}}task-dependency.c:30
  61 // CHECK: DONE
  62 // CHECK: ThreadSanitizer: reported 1 warnings