87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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// Regression test for https://github.com/golang/go/issues/39186
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// pthread barriers are not available on OS X
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// UNSUPPORTED: darwin
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#include "java.h"
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#include <string.h>
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struct Heap {
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uint64_t data;
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uint64_t ready;
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uint64_t finalized;
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uint64_t wg;
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pthread_barrier_t barrier_finalizer;
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pthread_barrier_t barrier_ballast;
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};
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void *Thread1(void *p) {
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Heap* heap = (Heap*)p;
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pthread_barrier_wait(&heap->barrier_finalizer);
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__tsan_java_finalize();
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__atomic_fetch_add(&heap->wg, 1, __ATOMIC_RELEASE);
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__atomic_store_n(&heap->finalized, 1, __ATOMIC_RELAXED);
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return 0;
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}
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void *Thread2(void *p) {
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Heap* heap = (Heap*)p;
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pthread_barrier_wait(&heap->barrier_finalizer);
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heap->data = 1;
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__atomic_store_n(&heap->ready, 1, __ATOMIC_RELEASE);
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return 0;
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}
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void *Thread3(void *p) {
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Heap* heap = (Heap*)p;
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pthread_barrier_wait(&heap->barrier_finalizer);
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while (__atomic_load_n(&heap->ready, __ATOMIC_ACQUIRE) != 1)
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pthread_yield();
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while (__atomic_load_n(&heap->finalized, __ATOMIC_RELAXED) != 1)
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pthread_yield();
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__atomic_fetch_add(&heap->wg, 1, __ATOMIC_RELEASE);
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return 0;
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}
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void *Ballast(void *p) {
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Heap* heap = (Heap*)p;
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pthread_barrier_wait(&heap->barrier_ballast);
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return 0;
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}
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int main() {
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Heap* heap = (Heap*)calloc(sizeof(Heap), 2) + 1;
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__tsan_java_init((jptr)heap, sizeof(*heap));
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__tsan_java_alloc((jptr)heap, sizeof(*heap));
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// Ballast threads merely make the bug a bit easier to trigger.
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const int kBallastThreads = 100;
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pthread_barrier_init(&heap->barrier_finalizer, 0, 4);
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pthread_barrier_init(&heap->barrier_ballast, 0, kBallastThreads + 1);
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pthread_t th[3];
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pthread_create(&th[0], 0, Thread1, heap);
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pthread_create(&th[1], 0, Thread2, heap);
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pthread_t ballast[kBallastThreads];
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for (int i = 0; i < kBallastThreads; i++)
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pthread_create(&ballast[i], 0, Ballast, heap);
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pthread_create(&th[2], 0, Thread3, heap);
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pthread_barrier_wait(&heap->barrier_ballast);
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for (int i = 0; i < kBallastThreads; i++)
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pthread_join(ballast[i], 0);
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pthread_barrier_wait(&heap->barrier_finalizer);
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while (__atomic_load_n(&heap->wg, __ATOMIC_ACQUIRE) != 2)
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pthread_yield();
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if (heap->data != 1)
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exit(printf("no data\n"));
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for (int i = 0; i < 3; i++)
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pthread_join(th[i], 0);
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pthread_barrier_destroy(&heap->barrier_ballast);
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pthread_barrier_destroy(&heap->barrier_finalizer);
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__tsan_java_free((jptr)heap, sizeof(*heap));
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fprintf(stderr, "DONE\n");
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return __tsan_java_fini();
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}
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// CHECK-NOT: WARNING: ThreadSanitizer: data race
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// CHECK: DONE
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