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

30 Mar 2009

      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@gmail.com>
...
Filip Klasson <filkl784@student.liu.se> 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
15 Carrallack Mews, St Just, Cornwall, TR19 7UL, UK. Company No. 5478976
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