forked from OSchip/llvm-project
58 lines
1.5 KiB
C++
58 lines
1.5 KiB
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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If the compiler does not support __has_feature macro, then you can build with
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CFLAGS="-fsanitize=thread -DTHREAD_SANITIZER" and then use
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#ifdef THREAD_SANITIZER to enabled annotations.
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*/
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#if defined(__has_feature) && __has_feature(thread_sanitizer)
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# define ANNOTATE_HAPPENS_BEFORE(addr) \
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AnnotateHappensBefore(__FILE__, __LINE__, (void*)(addr))
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# define ANNOTATE_HAPPENS_AFTER(addr) \
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AnnotateHappensAfter(__FILE__, __LINE__, (void*)(addr))
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extern "C" void AnnotateHappensBefore(const char *f, int l, void *addr);
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extern "C" void AnnotateHappensAfter(const char *f, int l, void *addr);
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#else
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# define ANNOTATE_HAPPENS_BEFORE(addr)
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# define ANNOTATE_HAPPENS_AFTER(addr)
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#endif
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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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