41 lines
881 B
C++
41 lines
881 B
C++
// RUN: %clangxx_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s --check-prefix=CHECK_O1
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// ---RUN: %clangxx_tsan -O2 %s -o %t && %t 2>&1 | FileCheck %s --check-prefix=CHECK_O2
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//
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// Check that load widening is not tsan-hostile.
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#include <pthread.h>
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#include <stdio.h>
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#include <string.h>
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struct {
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int i;
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char c1, c2, c3, c4;
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} S;
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int G;
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void *Thread1(void *x) {
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G = S.c1 + S.c3;
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return NULL;
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}
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void *Thread2(void *x) {
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S.c2 = 1;
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return NULL;
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}
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int main() {
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pthread_t t[2];
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memset(&S, 123, sizeof(S));
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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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printf("PASS\n");
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}
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// FIXME: currently, this test fails at -O2 (reports false positive).
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// CHECK_O2: WARNING: ThreadSanitizer: data race
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// CHECK_O1: PASS
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// CHECK_O1-NOT: WARNING: ThreadSanitizer: data race
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