Re: [boost] [thread] Assertion failed get_system_time_sentinel()

Subject: Re: [boost] [thread] Assertion failed get_system_time_sentinel()
From: Filip Klasson (filkl784_at_[hidden])
Date: 2009-03-30 09:19:39

Here is an example that demonstrates the problem:

//TestBoostTimeSentinel.cpp:
#include "Test.h"

void main()
{
    for (int i=0; i<100; i++) {
        Test* a = new Test();
        delete a;
    }
}

//Test.h:
#include <boost/thread/condition_variable.hpp>
#include <queue>

class Test {
public:
    Test(void);
    ~Test(void);
private:
    void start();
    boost::shared_ptr<boost::thread> _executorThread;
    mutable boost::mutex _mutex;
    std::priority_queue<int, std::string, std::less<int> > _prioQueue;
    boost::condition_variable _emptyQueueCondition;
};

//Test.cpp:
#include "Test.h"

Test::Test(void) : _executorThread(boost::shared_ptr<boost::thread>(new
boost::thread(&Test::start, this)))
{}

Test::~Test(void)
{}

void Test::start() {
    while (true) {
        boost::mutex::scoped_lock lock(_mutex);
        while (_prioQueue.empty()) {
            _emptyQueueCondition.wait(lock);
        }
    }
}

I use a for-loop because the problem doesnt occur every time.

2009/3/30 Anthony Williams <anthony.ajw_at_[hidden]>

> Filip Klasson <filkl784_at_[hidden]> writes:
>
> > Hi,
> >
> > I get Assertion failed
> > timed_lock(::boost::detail::get_system_time_sentinel()), file
> > c:\boost\thread\win32\basic_timed_mutex.hpp, line 64.
> >
> > Code in basic_timed_mutex.hpp:
> > void lock()
> > {
> >
> > BOOST_VERIFY(timed_lock(::boost::detail::get_system_time_sentinel()));
> > //Line 64
> > }
>
> That really is bizarre. Can you show a minimal example that demonstrates
> the problem?
>
> > Here is my code, i have marked where Assertion failed happends.
> >
> > boost::mutex::scoped_lock lock(_mutex);
> > while(_queue.empty()) {
> > _condition.wait(lock);
> > }   //Assertion failed happends here.
> > //Another thread is signaling the condition variable when an element is
> > added to the _queue.
>
> What is the lifetime of the various elements _mutex, _condition and
> _queue? Is it possible that they have been destroyed by another thread?
>
> Anthony
> --
> Author of C++ Concurrency in Action | http://www.manning.com/williams
> just::thread C++0x thread library   | http://www.stdthread.co.uk
> Just Software Solutions Ltd         |
> http://www.justsoftwaresolutions.co.uk
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