3ab6b2347e
Even sleep(1) lead to episodical flakes on some machines. Use an invisible by tsan barrier to enforce required execution order instead. This makes the tests deterministic and faster. llvm-svn: 226659
63 lines
1.5 KiB
C++
63 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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const int kTestCount = 4;
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typedef long long T;
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T atomics[kTestCount * 2];
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void Test(int test, T *p, bool main_thread) {
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volatile T sink;
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if (test == 0) {
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if (main_thread)
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__atomic_fetch_add(p, 1, __ATOMIC_RELAXED);
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else
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__atomic_fetch_add(p, 1, __ATOMIC_RELAXED);
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} else if (test == 1) {
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if (main_thread)
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__atomic_exchange_n(p, 1, __ATOMIC_ACQ_REL);
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else
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__atomic_exchange_n(p, 1, __ATOMIC_ACQ_REL);
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} else if (test == 2) {
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if (main_thread)
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sink = __atomic_load_n(p, __ATOMIC_SEQ_CST);
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else
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__atomic_store_n(p, 1, __ATOMIC_SEQ_CST);
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} else if (test == 3) {
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if (main_thread)
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sink = __atomic_load_n(p, __ATOMIC_SEQ_CST);
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else
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sink = *p;
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}
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}
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void *Thread(void *p) {
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for (int i = 0; i < kTestCount; i++) {
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Test(i, &atomics[i], false);
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}
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barrier_wait(&barrier);
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barrier_wait(&barrier);
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for (int i = 0; i < kTestCount; i++) {
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fprintf(stderr, "Test %d reverse\n", i);
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Test(i, &atomics[kTestCount + i], false);
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}
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return 0;
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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;
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pthread_create(&t, 0, Thread, 0);
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barrier_wait(&barrier);
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for (int i = 0; i < kTestCount; i++) {
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fprintf(stderr, "Test %d\n", i);
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Test(i, &atomics[i], true);
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}
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for (int i = 0; i < kTestCount; i++) {
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Test(i, &atomics[kTestCount + i], true);
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}
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barrier_wait(&barrier);
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pthread_join(t, 0);
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}
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// CHECK-NOT: ThreadSanitizer: data race
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