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// Copyright 2021 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.
#ifndef BASE_TRACING_TRACING_TLS_H_
#define BASE_TRACING_TRACING_TLS_H_
#include "base/base_export.h"
#include "base/threading/thread_local.h"
namespace base {
namespace tracing {
// Returns a thread-local flag that records whether the calling thread is
// running trace event related code. This is used to avoid writing trace events
// re-entrantly.
BASE_EXPORT ThreadLocalBoolean* GetThreadIsInTraceEventTLS();
// A scoped class for automatically setting and clearing a thread-local boolean
// flag.
class BASE_EXPORT AutoThreadLocalBoolean {
public:
explicit AutoThreadLocalBoolean(ThreadLocalBoolean* thread_local_boolean)
: thread_local_boolean_(thread_local_boolean) {
DCHECK(!thread_local_boolean_->Get());
thread_local_boolean_->Set(true);
}
~AutoThreadLocalBoolean() { thread_local_boolean_->Set(false); }
AutoThreadLocalBoolean(const AutoThreadLocalBoolean&) = delete;
AutoThreadLocalBoolean& operator=(const AutoThreadLocalBoolean&) = delete;
private:
base::ThreadLocalBoolean* thread_local_boolean_;
};
} // namespace tracing
} // namespace base
#endif // BASE_TRACING_TRACING_TLS_H_
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