[英]boost::mutex::scoped_lock has been used and It sometimes throws the exception
我在我的多線程代碼中使用scoped_lock來獨占訪問代碼的某些部分,但是有時它會拋出異常訪問沖突寫入位置...。
boost::mutex mMutex;
boost::condition mInputQueueNotEmpty;
Job* MyThreadPool<Job, JobOutput>::GetNextJob()
{
boost::mutex::scoped_lock lock(mMutex);
while (mInputQueue.empty())
mInputQueueNotEmpty.wait(lock);
// Do something ...
}
我跟蹤了代碼,發現在basic_timed_mutex類中有一個變量active_count,並且每當發生運行時錯誤時,該變量都將被初始化。 運行時錯誤發生在這里:
bool try_lock()
{
return !win32::interlocked_bit_test_and_set(&active_count,lock_flag_bit);
}
我不知道該怎么辦! 因為我無權訪問此變量,因此不負責初始化它。
更新
我函數的類是這樣的:
#pragma once
#include <vector.h>
#include <boost/thread.hpp>
#include "MyThread.h"
#include <queue>
#include <boost/thread/condition.hpp>
template <class Job, class JobOutput>
class MyThreadPool
{
public:
MyThreadPool(int processJobWhenArrived);
virtual ~MyThreadPool(void);
void Initialize(int ThreadsCount);
void AddJob(Job* job);
void StartProcess();
Job* GetNextJob();
virtual void FinishJob(Job* job, JobOutput* jobOutput);
void WaitUntilAllJobsProcessed();
public:
vector<MyThread<Job, JobOutput>*> mThreads;
queue<Job*> mInputQueue;
queue<pair<Job*,JobOutput*>> mOutputQueue;
boost::mutex mMutexAdd;
boost::mutex mMutex;
boost::condition mInputQueueNotEmpty;
boost::mutex mJobOutputMutex;
boost::mutex mJobsMutex;
boost::condition mProcessJobs;
bool mStartProcessJobs;
int mJobsInputCount;
int mJobsOutputCount;
int mPrevJobsOutputCount;
bool mProcessJobWhenArrived;
};
template <class Job, class JobOutput>
void MyThreadPool<Job, JobOutput>::Initialize(int threadsCount)
{
mStartProcessJobs = false;
for (int t = 0; t < threadsCount; t++)
mThreads.push_back(new MyThread<Job, JobOutput>(this));
}
template <class Job, class JobOutput>
void MyThreadPool<Job, JobOutput>::AddJob(Job* job)
{
boost::mutex::scoped_lock lock(mMutexAdd);
mInputQueue.push(job);
mJobsInputCount++;
if (mProcessJobWhenArrived)
mInputQueueNotEmpty.notify_all();
}
template <class Job, class JobOutput>
Job* MyThreadPool<Job, JobOutput>::GetNextJob()
{
boost::mutex::scoped_lock lock(mMutex);
if (mInputQueue.empty() && mStartProcessJobs && mJobsInputCount == mJobsOutputCount)
mProcessJobs.notify_one();
while (mInputQueue.empty())
mInputQueueNotEmpty.wait(lock);
Job* job = mInputQueue.front();
mInputQueue.pop();
return job;
}
這是我使用GetNextJob函數的代碼:
#pragma once
#include <MyMemory.h>
#include <boost/thread.hpp>
template <class Job, class JobOutput>
class MyThreadPool;
template <class Job, class JobOutput>
class MyThread
{
public:
static void StaticRun(MyThread* p);
void Run();
public:
boost::thread mThread;
MyThreadPool<Job, JobOutput>* mThreadPool;
};
#include "MyThreadPool.h"
template <class Job, class JobOutput>
MyThread<Job, JobOutput>::MyThread(MyThreadPool<Job, JobOutput>* threadPool)
{
mThread = boost::thread(StaticRun, this);
mThreadPool = threadPool;
}
template <class Job, class JobOutput>
void MyThread<Job, JobOutput>::StaticRun(MyThread* p)
{
p->Run();
}
template <class Job, class JobOutput>
void MyThread<Job, JobOutput>::Run()
{
JobOutput *jobOutput;
while (true)
{
Job* job = mThreadPool->GetNextJob();
jobOutput = Process (job);
mThreadPool->FinishJob(job, jobOutput);
}
}
有一個類會激怒MyThreadPool
class SsThreadPool : public MyThreadPool<Job, JobOutput>
這是使用threadPool的地方:
class BPS
{
//...
SsThreadPool mJobsThreadPool;
//...
}
void BPS::Initialize()
{
mJobsThreadPool.Initialize(mConcurrentThreadsCount);
}
void BPS::f()
{
//...
for (int i = 0; i < jobsCount; i++)
{
//...
mJobsThreadPool.AddJob(job);
//...
}
mJobsThreadPool.StartProcess();
mJobsThreadPool.WaitUntilAllJobsProcessed();
//...
}
因為您嘗試鎖定損壞的mutex
鎖,所以會引起訪問沖突。 由於互斥鎖是您的類的成員,所以這意味着您的代碼嘗試訪問已破壞實例的成員函數(“懸掛指針”)。 要調試這種情況,請在~MyThreadPool
放置一個斷點,看看何時調用它。
可能是持有互斥鎖的對象被破壞,然后有人試圖訪問該互斥鎖。 您的代碼中可能嗎?
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