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codingJoe

Mutex creation in multithreaded library

9 posts in this topic

Hello,

 

I think I have a kind of chicken-egg problem:

 

I have a library (dll) that is pure C and that is supposed to be thread-safe.

How do I initialize it? I mean, at some point I need to call

 

globalMutex=CreateMutex(0,FALSE,0);
do some other initializations here

The above section of code should be run only the very first time someone calls a function in the library. But what if several threads call the library at the same time? Best would be to have a mutex to make sure the initialization happens only once, but mutexes need to be initialized...

Any idea?

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Doesn't it get called only once, when you load library? So just load it before creating any threads.

Edited by Zaoshi Kaba
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Thanks for all the replies.

The library can actually be compiled for many different platforms (also microcontrollers), and is allready in use. For that reason I cannot use an additional function that initializes everything.

I was just wondering if there is an extremely lightweight lock one can build, that is not OS dependent?

Or at least a random/timed mechanism that will reduce the chance for 2 threads entering the initialization section?

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I was just wondering if there is an extremely lightweight lock one can build, that is not OS dependent?

Boost has a pretty good collection of synchronization tools, although it may not be supported on your microcontrollers.

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