forked from OSchip/llvm-project
50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
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#include "test.h"
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long long Data;
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long long Sync;
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void *Thread1(void *x) {
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Data++;
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__atomic_store_n(&Sync, 1, __ATOMIC_RELEASE);
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barrier_wait(&barrier);
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barrier_wait(&barrier);
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return NULL;
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}
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void *Thread2(void *x) {
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barrier_wait(&barrier);
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if (__atomic_load_n(&Sync, __ATOMIC_RELAXED) != 1)
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exit(0);
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// This store must terminate release sequence of the store in Thread1,
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// thus tsan must detect race between Thread1 and main on Data.
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__atomic_store_n(&Sync, 2, __ATOMIC_RELEASE);
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barrier_wait(&barrier);
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return NULL;
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}
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int main() {
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barrier_init(&barrier, 3);
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pthread_t t[2];
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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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barrier_wait(&barrier);
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barrier_wait(&barrier);
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if (__atomic_load_n(&Sync, __ATOMIC_ACQUIRE) != 2)
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exit(0);
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if (Data != 1)
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exit(0);
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pthread_join(t[0], NULL);
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pthread_join(t[1], NULL);
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fprintf(stderr, "DONE\n");
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return 0;
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}
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// CHECK: WARNING: ThreadSanitizer: data race
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// CHECK: Read
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// CHECK: #0 main
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// CHECK: Previous write
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// CHECK: #0 Thread1
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// CHECK: Location is global 'Data'
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// CHECK: DONE
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