forked from OSchip/llvm-project
49 lines
1.2 KiB
C++
49 lines
1.2 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 = 3;
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typedef long long T;
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T data[kTestCount];
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T atomics[kTestCount];
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void *Thread(void *p) {
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for (int i = 0; i < kTestCount; i++) {
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barrier_wait(&barrier);
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while (__atomic_load_n(&atomics[i], __ATOMIC_ACQUIRE) == 0) {
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}
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data[i]++;
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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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for (int i = 0; i < kTestCount; i++) {
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barrier_wait(&barrier);
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// We want the release to happen while the other thread
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// spins calling load-acquire. This can expose some
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// interesting interleavings of release and acquire.
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usleep(100 * 1000);
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data[i] = 1;
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switch (i) {
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case 0:
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__atomic_store_n(&atomics[i], 1, __ATOMIC_RELEASE);
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break;
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case 1:
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__atomic_fetch_add(&atomics[1], 1, __ATOMIC_RELEASE);
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break;
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case 2:
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T cmp = 0;
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__atomic_compare_exchange_n(&atomics[2], &cmp, 1, false, __ATOMIC_RELEASE, __ATOMIC_RELAXED);
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break;
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}
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}
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pthread_join(t, 0);
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fprintf(stderr, "DONE\n");
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}
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// CHECK-NOT: ThreadSanitizer: data race
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// CHECK: DONE
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