Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/tsan/cond_destruction.cc

@@ -0,0 +1,53 @@
+// RUN: %clangxx_tsan -O1 %s -o %t
+// RUN: %run %t 2>&1 | FileCheck %s
+// RUN: %run %t arg 2>&1 | FileCheck %s
+// RUN: %run %t arg arg 2>&1 | FileCheck %s
+#include "test.h"
+
+// Test for destruction of pthread_cond_t.
+// POSIX states that it is safe  to destroy a condition variable upon which no
+// threads are currently blocked. That is, it is not necessary to wait untill
+// other threads return from pthread_cond_wait, they just need to be unblocked.
+
+pthread_mutex_t m;
+pthread_cond_t c;
+bool done1, done2;
+
+void *thr(void *p) {
+  pthread_mutex_lock(&m);
+  done1 = true;
+  pthread_cond_signal(&c);
+  while (!done2)
+    pthread_cond_wait(&c, &m);
+  pthread_mutex_unlock(&m);
+  return 0;
+}
+
+int main(int argc, char **argv) {
+  pthread_t th;
+  pthread_mutex_init(&m, 0);
+  pthread_cond_init(&c, 0);
+  pthread_create(&th, 0, thr, 0);
+  pthread_mutex_lock(&m);
+  while (!done1)
+    pthread_cond_wait(&c, &m);
+  done2 = true;
+  // Any of these sequences is legal.
+  if (argc == 1) {
+    pthread_cond_signal(&c);
+    pthread_mutex_unlock(&m);
+    pthread_cond_destroy(&c);
+  } else if (argc == 2) {
+    pthread_mutex_unlock(&m);
+    pthread_cond_signal(&c);
+    pthread_cond_destroy(&c);
+  } else {
+    pthread_cond_signal(&c);
+    pthread_cond_destroy(&c);
+    pthread_mutex_unlock(&m);
+  }
+  pthread_join(th, 0);
+  fprintf(stderr, "DONE\n");
+}
+
+// CHECK-NOT: ThreadSanitizer: data race