42 lines
836 B
C++
42 lines
836 B
C++
// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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#include "test.h"
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/*
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Annotations usage example.
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Tsan does not see synchronization in barrier_wait.
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ANNOTATE_HAPPENS_BEFORE/AFTER communicate the synchronization to tsan
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and prevent the race report.
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*/
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int Global;
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void *Thread1(void *x) {
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barrier_wait(&barrier);
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ANNOTATE_HAPPENS_AFTER(&barrier);
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Global++;
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return NULL;
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}
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void *Thread2(void *x) {
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Global--;
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ANNOTATE_HAPPENS_BEFORE(&barrier);
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barrier_wait(&barrier);
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return NULL;
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}
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int main() {
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barrier_init(&barrier, 2);
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pthread_t t[2];
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pthread_create(&t[0], NULL, Thread1, NULL);
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pthread_create(&t[1], NULL, Thread2, NULL);
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pthread_join(t[0], NULL);
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pthread_join(t[1], NULL);
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fprintf(stderr, "DONE\n");
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return 0;
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}
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// CHECK-NOT: WARNING: ThreadSanitizer: data race
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// CHECK: DONE
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