llvm-project

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// RUN: %clang_tsan %darwin_min_target_with_tls_support %s -o %t
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// RUN: %clang_tsan %darwin_min_target_with_tls_support %s -DBUILD_SO -fPIC -o \
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// RUN:   %t-so.so -shared
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// RUN: %run %t 2>&1 | FileCheck %s
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// XFAIL: target={{.*netbsd.*}}
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// Test that tsan cleans up dynamic TLS memory between reuse.
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#include "test.h"
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#ifndef BUILD_SO
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#include <assert.h>
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#include <dlfcn.h>
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typedef volatile long *(* get_t)();
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get_t GetTls;
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void *Thread1(void *arg) {
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  pthread_detach(pthread_self());
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  volatile long *x = GetTls();
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  *x = 42;
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  fprintf(stderr, "stack: %p dtls: %p\n", &x, x);
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  barrier_wait(&barrier);
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  return 0;
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}
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void *Thread2(void *arg) {
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  volatile long *x = GetTls();
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  *x = 42;
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  fprintf(stderr, "stack: %p dtls: %p\n", &x, x);
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  return 0;
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}
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int main(int argc, char *argv[]) {
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  char path[4096];
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  snprintf(path, sizeof(path), "%s-so.so", argv[0]);
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  void *handle = dlopen(path, RTLD_LAZY);
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  if (!handle) fprintf(stderr, "%s\n", dlerror());
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  assert(handle != 0);
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  GetTls = (get_t)dlsym(handle, "GetTls");
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  assert(dlerror() == 0);
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  barrier_init(&barrier, 2);
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  pthread_t t[2];
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  pthread_create(&t[0], 0, Thread1, 0);
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  barrier_wait(&barrier);
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  // Wait for actual thread termination without using pthread_join,
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  // which would synchronize threads.
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  sleep(1);
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  pthread_create(&t[1], 0, Thread2, 0);
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  pthread_join(t[1], 0);
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  fprintf(stderr, "DONE\n");
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  return 0;
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}
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#else  // BUILD_SO
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__thread long huge_thread_local_array[1 << 17];
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long *GetTls() {
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  return &huge_thread_local_array[0];
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}
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#endif
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// CHECK-NOT: ThreadSanitizer: data race
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// CHECK: DONE
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