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How can I confirm that our code is thread safe?

Posted on 2001-09-03
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Last Modified: 2010-04-21
Anyone can provide me a way that can prove my code
is tread safe? Or how can I test my code is not tread
safe?

Thanks
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Question by:choudes
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6 Comments
 
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by:Anthony2000
ID: 6470408
choudes,

Do you know exactly what thread safe is?
Then I will know where to start to help you.

Anthony.
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Expert Comment

by:weismat
ID: 6474030
Thread-safe is a term used to describe a routine that can be called from multiple programming threads without unwanted interaction between the threads. Thread safety is of particular importance to Java programmers, since Java is a programming language that provides built-in support for threads. By using thread-safe routines, the risk that one thread will interfere and modify data elements of another thread is eliminated by circumventing potential data race situations with coordinated access to shared data.
It is possible to ensure that a routine is thread-safe by:

1. Making sure that concurrent threads use synchronized algorithms that cooperate with each other.
2. Confining the address of a shared object to one thread whenever an unsynchronized algorithm is active.

From my experience issues with thread save problems usually occur when you use static objects, methods or properties and you have some left overs there.

There is no silver bullet to secure this, but you should have a look at the static things first.
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by:bearware
ID: 6526608
If you just want it thread safe, but you routine will not take advantage of threads. (This is the most common case for routines that are or might be used in a multithread environment i.e. library code)

All data must be  automatic, or object type.
No statics no globals.
I.E. No data is shared between threads.

If you use statics to share data between threads you should learn more.

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Expert Comment

by:jerntat
ID: 6626929
I'm just curious, would it be unsafe if i create an object dynamically using 'new' in a thread process?
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by:SpideyMod
ID: 8275949
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