| 1 | // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s |
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| 2 | #include "test.h" |
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| 3 | |
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| 4 | /* |
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| 5 | Annotations usage example. |
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| 6 | |
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| 7 | Tsan does not see synchronization in barrier_wait. |
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| 8 | ANNOTATE_HAPPENS_BEFORE/AFTER communicate the synchronization to tsan |
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| 9 | and prevent the race report. |
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| 10 | */ |
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| 11 | |
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| 12 | int Global; |
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| 13 | |
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| 14 | void *Thread1(void *x) { |
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| 15 | barrier_wait(barrier: &barrier); |
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| 16 | ANNOTATE_HAPPENS_AFTER(&barrier); |
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| 17 | Global++; |
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| 18 | return NULL; |
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| 19 | } |
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| 20 | |
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| 21 | void *Thread2(void *x) { |
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| 22 | Global--; |
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| 23 | ANNOTATE_HAPPENS_BEFORE(&barrier); |
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| 24 | barrier_wait(barrier: &barrier); |
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| 25 | return NULL; |
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| 26 | } |
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| 27 | |
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| 28 | int main() { |
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| 29 | barrier_init(barrier: &barrier, count: 2); |
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| 30 | pthread_t t[2]; |
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| 31 | pthread_create(newthread: &t[0], NULL, start_routine: Thread1, NULL); |
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| 32 | pthread_create(newthread: &t[1], NULL, start_routine: Thread2, NULL); |
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| 33 | pthread_join(th: t[0], NULL); |
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| 34 | pthread_join(th: t[1], NULL); |
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| 35 | fprintf(stderr, format: "DONE\n" ); |
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| 36 | return 0; |
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| 37 | } |
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| 38 | |
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| 39 | // CHECK-NOT: WARNING: ThreadSanitizer: data race |
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| 40 | // CHECK: DONE |
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| 41 | |
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| 42 | |
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