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150
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1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
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2 // Race between an aligned access and an unaligned access, which
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3 // touches the same memory region.
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4 #include "test.h"
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5 #include <stdint.h>
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6
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7 uint64_t Global[2];
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8
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9 void *Thread1(void *x) {
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10 Global[1]++;
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11 barrier_wait(&barrier);
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12 return NULL;
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13 }
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14
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15 void *Thread2(void *x) {
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16 barrier_wait(&barrier);
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17 char *p1 = reinterpret_cast<char *>(&Global[0]);
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18 struct __attribute__((packed, aligned(1))) u_uint64_t { uint64_t val; };
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19 u_uint64_t *p4 = reinterpret_cast<u_uint64_t *>(p1 + 1);
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20 (*p4).val++;
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21 return NULL;
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22 }
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23
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24 int main() {
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25 barrier_init(&barrier, 2);
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26 pthread_t t[2];
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27 pthread_create(&t[0], NULL, Thread1, NULL);
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28 pthread_create(&t[1], NULL, Thread2, NULL);
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29 pthread_join(t[0], NULL);
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30 pthread_join(t[1], NULL);
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31 fprintf(stderr, "Pass\n");
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32 // CHECK: ThreadSanitizer: data race
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33 // CHECK: Pass
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34 return 0;
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35 }
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