tor-browser

The Tor Browser
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ThreadInfo.h (2048B)

      1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #ifndef ThreadInfo_h
      8 #define ThreadInfo_h
      9 
     10 #include "mozilla/Atomics.h"
     11 #include "mozilla/BaseProfilerUtils.h"
     12 #include "mozilla/TimeStamp.h"
     13 
     14 namespace mozilla {
     15 namespace baseprofiler {
     16 
     17 // This class contains information about a thread which needs to be stored
     18 // across restarts of the profiler and which can be useful even after the
     19 // thread has stopped running.
     20 // It uses threadsafe refcounting and only contains immutable data.
     21 class ThreadInfo final {
     22 public:
     23  ThreadInfo(const char* aName, BaseProfilerThreadId aThreadId,
     24             bool aIsMainThread,
     25             const TimeStamp& aRegisterTime = TimeStamp::Now())
     26      : mName(aName),
     27        mRegisterTime(aRegisterTime),
     28        mThreadId(aThreadId),
     29        mIsMainThread(aIsMainThread),
     30        mRefCnt(0) {
     31    MOZ_ASSERT(aThreadId.IsSpecified(),
     32               "Given aThreadId should not be unspecified");
     33  }
     34 
     35  // Using hand-rolled ref-counting, because RefCounted.h macros don't produce
     36  // the same code between mozglue and libxul, see bug 1536656.
     37  MFBT_API void AddRef() const { ++mRefCnt; }
     38  MFBT_API void Release() const {
     39    MOZ_ASSERT(int32_t(mRefCnt) > 0);
     40    if (--mRefCnt == 0) {
     41      delete this;
     42    }
     43  }
     44 
     45  const char* Name() const { return mName.c_str(); }
     46  TimeStamp RegisterTime() const { return mRegisterTime; }
     47  BaseProfilerThreadId ThreadId() const { return mThreadId; }
     48  bool IsMainThread() const { return mIsMainThread; }
     49 
     50 private:
     51  const std::string mName;
     52  const TimeStamp mRegisterTime;
     53  const BaseProfilerThreadId mThreadId;
     54  const bool mIsMainThread;
     55 
     56  mutable Atomic<int32_t, MemoryOrdering::ReleaseAcquire> mRefCnt;
     57 };
     58 
     59 }  // namespace baseprofiler
     60 }  // namespace mozilla
     61 
     62 #endif  // ThreadInfo_h