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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/check.h"
- #include "base/memory/raw_ptr.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:
- raw_ptr<base::ThreadLocalBoolean> thread_local_boolean_;
- };
- } // namespace tracing
- } // namespace base
- #endif // BASE_TRACING_TRACING_TLS_H_
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