multithreading

This is a discussion on multithreading within the Linux Programming forums, part of the Platform Specific Boards category; hi everybody. im playing around with the clone() syscall to implement multithreading. My problem now is, that every time i ...

  1. #1
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    multithreading

    hi everybody.

    im playing around with the clone() syscall to implement multithreading. My problem now is, that every time i try to clone() a thread out of another clone()d thread the program crashes with an segmentation fault.
    You got an idea why? I really need the feature to create an thread out of another.. but it seems, that clone() is the wrong way

    ice

  2. #2
    and the hat of int overfl Salem's Avatar
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    Post a small example code which crashes perhaps.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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    Try using POSIX threads instead of clone(). look at pthread_create(). Granted, you should still be able to use clone() for multithreading (I think some implementations of pthread_create() use clone()), but using the POSIX methods might make you life a little easier.

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    Quote Originally Posted by bithub
    Try using POSIX threads instead of clone(). look at pthread_create(). Granted, you should still be able to use clone() for multithreading (I think some implementations of pthread_create() use clone()), but using the POSIX methods might make you life a little easier.
    All implementations of pthread_create() must use some form of clone() later on, the linux kernel can not handle threads. All threads are in linux are just "lightweight processes".
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    thank you for the replys.
    i already used the posix threads one day after my first post. So i have no more problems with multithreading.

    But i'm still interestet in the fac, why the 2. clone call was crashing. i'll search the example code and post it.. just give me some time
    But i think its my fault, because as i read the pthread_create function just uses the clone system call..

    ice
    Last edited by IceBall; 09-21-2004 at 12:24 AM.

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    hmm cant find the code.. but it looked like this:

    int thread2() {..}

    int thread1() { clone(..., thread2,...);...}

    int main() {clone(..., thread1,...); ...}

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