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Why send interrupt to a thread?

Simon Cockayne
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Joined: Dec 09, 2000
Posts: 214
Hi,

I understand the application of the interrupt method.

But WHY would one ever call interrupt on a thread that is waiting on an object's lock?

A "real world" illustration would be much appreciated.

Regards,

Simon.


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Nav Letha
Greenhorn

Joined: Oct 22, 2006
Posts: 8
Socket not responding...Reader not responding...
Nicholas Jordan
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Joined: Sep 17, 2006
Posts: 1282
Actually, many people ignore the why of the matter: Depends on what your target user is.
If the sole thread of execution, running both the user-interface and the program it's self, tries to open a socket or something that the operating system does not manage for the programmer - the mouse and everything else for that program is hung. To the user it appears that the program has failed, and it has from a reliability issue, because the user cannot regain control of the machine if the socket call hangs.
The correct way to do this is make a boolean variable in the class instantiated, then occsionally check that variable from another thread. The reason for this is that the only way to break the socket call is to
the socket call. The only way to interrupt it is from another Thread.

Interrupts should only be used as crisis-management.

Not for routine load-balancing.


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Virag Saksena
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Joined: Nov 27, 2005
Posts: 71
A good real time example is normally a thread sleeps for n seconds before retrying. Some times a high priority event occurs in some other thread and so the sleeping thread needs to be interrupted.


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