Re: Hang in throw

=?ISO-8859-2?Q?Marcel_M=FCller?= <>
Mon, 21 Sep 2009 11:39:18 +0200

jarek wrote:

I have strange problem - program hangs on calling throw. The program is
quite simple, so I don't this that source code with tell something.
The question is: how to debug it? The same throw called from other
places works fine. But from one hangs program.
Debian Lenny, gcc 4.3.2

There is a class:

class Exception : public exception {


And in some place of code there is:

throw Exception("Command failed!");

In some cases program hangs on this throw statement.
What can be the reason ?

you certainly provided only the unimportant part of the information.
It is essential where you throw an exception!

- You exception could be uncaught. In this case the runtime will abort
your program. However, there are places, where this is unwise, because
you are currently executing a callback from the runtime, e.g. a signal

- Your exception could be caught, but that causes a deadlock, because
you threw the exception while holding a mutex. With a non-recursive
mutex this may even happen with a single thread.

- You application code might not be exception safe because of code
fragments with undefined behavior in case of exceptions.


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