Databases
StackOverflow2013
Postsdbo
POFinalizer Throws Random Exceptions, Raises Random Errors, Hangs App
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POFinalizer Throws Random Exceptions, Raises Random Errors, Hangs App
    primarykey
    data
    text
    <p>I have a class in C++/CLI that uses unmanaged resources (a HANDLE for a native thread (i.e. from CreateThread()) and an LPVOID for a fiber from CreateFiber/ConvertThreadToFiber).</p> <p>Under the advice I got from <a href="http://msdn.microsoft.com/en-us/library/ms177197.aspx" rel="nofollow">MSDN</a> I'm cleaning up the unmanaged resources in the finalizer (!Fiber()), and the destructor (~Fiber()) is calling the finalizer.</p> <p>Here's the code:</p> <pre><code>Fiber::~Fiber () { this-&gt;!Fiber(); } Fiber::!Fiber () { if (thread!=NULL) { delete thread; thread=NULL; } if (fiber!=NULL) { DeleteFiber(fiber); fiber=NULL; } } </code></pre> <p>I have a test app that creates two fibers, tests them, and then disposes them as it's done with them. The first one is disposed just fine. The last one is disposed as the last line of the program, and it crashes out in one of three different ways:</p> <pre><code>Unhandled Exception: System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. at DeleteFiber(Void* ) at System.Threading.Fiber.!Fiber() at System.Threading.Fiber.Dispose(Boolean ) at System.Threading.Fiber.Finalize() </code></pre> <p>That error can also come from the line:</p> <pre><code>delete thread; </code></pre> <p>As well.</p> <p>It may also crash with an OutOfMemoryException, or by hanging for a while, saying that the program experienced a stack overflow, and then hanging the console (I have to close cmd.exe and restart it to recover).</p> <p>If I comment the destructor/finalizer out, and run the program, it runs perfectly, but that's not an option because I don't want unmanaged resources hanging around until the program ends...</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USkennytm
    1. USRobert Allan Hennigan Leahy
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COWhat does the DeleteFiber() method look like?
      singulars
      1. POFinalizer Throws Random Exceptions, Raises Random Errors, Hangs App
      1. USCorith Malin
    2. CO[Like this.](http://msdn.microsoft.com/en-us/library/windows/desktop/ms682556(v=VS.85).aspx)
      singulars
      1. POFinalizer Throws Random Exceptions, Raises Random Errors, Hangs App
      1. USRobert Allan Hennigan Leahy
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload