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// RUN: %clangxx_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s
#include <pthread.h>
#include <unistd.h>
#include <stdio.h>
const int kTestCount = 4;
typedef long long T;
T atomics[kTestCount * 2];
void Test(int test, T *p, bool main_thread) {
volatile T sink;
if (test == 0) {
if (main_thread)
__atomic_fetch_add(p, 1, __ATOMIC_RELAXED);
else
*p = 42;
} else if (test == 1) {
if (main_thread)
__atomic_fetch_add(p, 1, __ATOMIC_RELAXED);
else
sink = *p;
} else if (test == 2) {
if (main_thread)
sink = __atomic_load_n(p, __ATOMIC_SEQ_CST);
else
*p = 42;
} else if (test == 3) {
if (main_thread)
__atomic_store_n(p, 1, __ATOMIC_SEQ_CST);
else
sink = *p;
}
}
void *Thread(void *p) {
for (int i = 0; i < kTestCount; i++) {
Test(i, &atomics[i], false);
}
sleep(2);
for (int i = 0; i < kTestCount; i++) {
fprintf(stderr, "Test %d reverse\n", i);
Test(i, &atomics[kTestCount + i], false);
}
return 0;
}
int main() {
pthread_t t;
pthread_create(&t, 0, Thread, 0);
sleep(1);
for (int i = 0; i < kTestCount; i++) {
fprintf(stderr, "Test %d\n", i);
Test(i, &atomics[i], true);
}
for (int i = 0; i < kTestCount; i++) {
Test(i, &atomics[kTestCount + i], true);
}
pthread_join(t, 0);
}
// CHECK: Test 0
// CHECK: ThreadSanitizer: data race
// CHECK-NOT: SUMMARY{{.*}}tsan_interface_atomic
// CHECK: Test 1
// CHECK: ThreadSanitizer: data race
// CHECK-NOT: SUMMARY{{.*}}tsan_interface_atomic
// CHECK: Test 2
// CHECK: ThreadSanitizer: data race
// CHECK-NOT: SUMMARY{{.*}}tsan_interface_atomic
// CHECK: Test 3
// CHECK: ThreadSanitizer: data race
// CHECK-NOT: SUMMARY{{.*}}tsan_interface_atomic
// CHECK: Test 0 reverse
// CHECK: ThreadSanitizer: data race
// CHECK: Test 1 reverse
// CHECK: ThreadSanitizer: data race
// CHECK: Test 2 reverse
// CHECK: ThreadSanitizer: data race
// CHECK: Test 3 reverse
// CHECK: ThreadSanitizer: data race
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