blob: 33f823e2f9ed5766002480280e606c43c0a8ebf8 [file] [log] [blame]
// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/test/clang_coverage.h"
#include "base/no_destructor.h"
#include "base/synchronization/lock.h"
extern "C" int __llvm_profile_dump(void);
namespace base {
void WriteClangCoverageProfile() {
// __llvm_profile_dump() guarantees that it will not dump coverage information
// if it is being called twice or more. However, it is not thread safe, as it
// is supposed to be called from atexit() handler rather than being called
// directly from random places. Since we have to call it ourselves, we must
// ensure thread safety in order to prevent duplication of coverage counters.
static base::NoDestructor<base::Lock> lock;
base::AutoLock auto_lock(*lock);
} // namespace base