| 1 | // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s |
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| 2 | // RUN: %clangxx_tsan -O2 %s -o %t && %run %t 2>&1 | FileCheck %s |
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| 3 | // RUN: %clangxx_tsan -O3 %s -o %t && %run %t 2>&1 | FileCheck %s |
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| 4 | // |
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| 5 | // Check that load widening is not tsan-hostile. |
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| 6 | #include <pthread.h> |
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| 7 | #include <stdio.h> |
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| 8 | #include <string.h> |
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| 9 | |
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| 10 | struct { |
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| 11 | int i; |
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| 12 | char c1, c2, c3, c4; |
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| 13 | } S; |
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| 14 | |
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| 15 | int G; |
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| 16 | |
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| 17 | void *Thread1(void *x) { |
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| 18 | G = S.c1 + S.c3; |
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| 19 | return NULL; |
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| 20 | } |
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| 21 | |
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| 22 | void *Thread2(void *x) { |
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| 23 | S.c2 = 1; |
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| 24 | return NULL; |
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| 25 | } |
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| 26 | |
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| 27 | int main() { |
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| 28 | pthread_t t[2]; |
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| 29 | memset(s: &S, c: 123, n: sizeof(S)); |
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| 30 | pthread_create(newthread: &t[0], NULL, start_routine: Thread1, NULL); |
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| 31 | pthread_create(newthread: &t[1], NULL, start_routine: Thread2, NULL); |
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| 32 | pthread_join(th: t[0], NULL); |
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| 33 | pthread_join(th: t[1], NULL); |
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| 34 | fprintf(stderr, format: "PASS\n" ); |
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| 35 | } |
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| 36 | |
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| 37 | // CHECK-NOT: WARNING: ThreadSanitizer: data race |
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| 38 | // CHECK: PASS |
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| 39 | |
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