llvm-project/compiler-rt/test/tsan/race_on_puts.cpp

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// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
#include "test.h"
char s[] = "abracadabra";
void *Thread0(void *p) {
puts(s);
barrier_wait(&barrier);
return 0;
}
void *Thread1(void *p) {
barrier_wait(&barrier);
s[3] = 'z';
return 0;
}
int main() {
barrier_init(&barrier, 2);
pthread_t th[2];
pthread_create(&th[0], 0, Thread0, 0);
pthread_create(&th[1], 0, Thread1, 0);
pthread_join(th[0], 0);
pthread_join(th[1], 0);
fprintf(stderr, "DONE");
}
// CHECK: WARNING: ThreadSanitizer: data race
// CHECK: DONE