chromium/v8/src/libsampler/sampler.h

// Copyright 2016 the V8 project 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 V8_LIBSAMPLER_SAMPLER_H_
#define V8_LIBSAMPLER_SAMPLER_H_

#include <atomic>
#include <memory>
#include <unordered_map>
#include <vector>

#include "src/base/lazy-instance.h"
#include "src/base/macros.h"

#if V8_OS_POSIX && !V8_OS_CYGWIN && !V8_OS_FUCHSIA
#define USE_SIGNALS
#endif

namespace v8 {

class Isolate;
struct RegisterState;

namespace sampler {

// ----------------------------------------------------------------------------
// Sampler
//
// A sampler periodically samples the state of the VM and optionally
// (if used for profiling) the program counter and stack pointer for
// the thread that created it.

class V8_EXPORT_PRIVATE Sampler { … };

#ifdef USE_SIGNALS

AtomicMutex;

// A helper that uses an std::atomic_bool to create a lock that is obtained on
// construction and released on destruction.
class V8_EXPORT_PRIVATE V8_NODISCARD AtomicGuard { … };

// SamplerManager keeps a list of Samplers per thread, and allows the caller to
// take a sample for every Sampler on the current thread.
class V8_EXPORT_PRIVATE SamplerManager { … };

#endif  // USE_SIGNALS

}  // namespace sampler
}  // namespace v8

#endif  // V8_LIBSAMPLER_SAMPLER_H_